Arc quenching portion and air circuit breaker comprising the same

Abstract

Disclosed are an arc extinguishing portion and an air circuit breaker including the same. The arc extinguishing portion according to an embodiment of the present invention includes an arc extinguishing magnet positioned on an upper side of a grid. The arc extinguishing magnet forms a magnetic field inside the arc extinguishing portion and a fixed contact and a movable contact positioned adjacent to the arc extinguishing portion. An arc generated by the fixed contact and the movable contact being spaced apart receives an electromagnetic force inside the formed magnetic field. The electromagnetic force is formed in a direction toward the outside of the arc extinguishing portion through the grid. Accordingly, the generated arc can be rapidly extinguished and moved.

Description

Technical Field

[0001] The present invention relates to an arc-extinguishing section and an air circuit breaker including the arc-extinguishing section, and more specifically, to an arc-extinguishing section capable of blocking current to effectively extinguish generated electric arcs and an air circuit breaker including the arc-extinguishing section. Background Technology

[0002] A circuit breaker is a machine that allows or blocks the flow of electricity to the outside world through the contact and separation of fixed contacts and movable contacts. The fixed contacts and movable contacts of the circuit breaker are energized and connected to the external power source or load.

[0003] The movable contact is movably mounted on the circuit breaker. The movable contact can move toward or away from the fixed contact. If the movable contact and the fixed contact are in contact, the circuit breaker can be energized and connected to an external power source or load.

[0004] When an overcurrent or abnormal current flows through the circuit breaker, the movable and fixed contacts, which are in contact, are separated from each other. At this time, the current flowing between the movable and fixed contacts does not immediately extinguish, but changes into the form of an arc and extends along the movable contact.

[0005] An electric arc can be defined as the flow of electrons under high temperature and pressure. Therefore, if the generated arc remains inside the circuit breaker for an extended period, the various components of the circuit breaker may be damaged. Furthermore, if the arc is discharged to the outside of the circuit breaker without further treatment, the user may be injured.

[0006] Therefore, circuit breakers are typically equipped with extinguishing devices to extinguish and expel the electric arc. As the generated arc passes through the extinguishing device, its pressure increases, its movement speed accelerates, and it is simultaneously cooled and expelled to the outside.

[0007] Therefore, the generated electric arc should be rapidly induced towards the arc extinguishing device.

[0008] Korean Patent Publication No. 10-2015-0001499 discloses a circuit breaker with a gas-insulated switching device for improving arc energy utilization. Specifically, it discloses a puffer-type circuit breaker that improves arc extinguishing performance by utilizing arc energy to increase the pressure of the extinguishing gas.

[0009] However, this type of circuit breaker is limited in that it can only be applied to circuit breakers that use other gases as the medium for extinguishing electric arcs. That is, the limitation of the existing literature is that it is only applicable to situations where SF6 (Sulfurhexafluoride) is used as the medium for extinguishing electric arcs, and it is difficult to apply it to air circuit breakers that use air as the medium.

[0010] Korean Utility Model Publication No. 20-100000825 discloses a current-limiting structure for an air circuit breaker. Specifically, the current-limiting structure for an air circuit breaker includes: a grid, stacked to have a certain gap in the arc chamber and forming an induction groove, thereby locating the contacts; and a grid plate disposed on the side wall of the induction groove of the grid.

[0011] However, while this type of circuit breaker can induce an arc towards the grid via a guide plate, it fails to disclose a scheme for forming an arc that does not flow towards the guide plate. That is, the limitation of the existing literature is that it does not examine schemes for effectively forming an arc that is not adjacent to the guide plate. Summary of the Invention

[0012] The problem that the invention aims to solve

[0013] The purpose of this invention is to provide an arc-extinguishing section having a structure capable of solving the above-mentioned problems, and an air circuit breaker including the arc-extinguishing section.

[0014] Firstly, the objective is to provide an arc-extinguishing section and an air circuit breaker including the arc-extinguishing section, wherein the structure of the arc-extinguishing section is capable of rapidly extinguishing and moving the generated arc.

[0015] In addition, the objective is to provide an arc-extinguishing section and an air circuit breaker including the arc-extinguishing section, wherein the magnet in the structure of the arc-extinguishing section that forms a magnetic field related to the movement path of the electric arc will not be damaged by the electric arc.

[0016] In addition, the objective is to provide an arc-extinguishing section and an air circuit breaker including the arc-extinguishing section, wherein the structure of the arc-extinguishing section does not require excessive design changes in order to provide a magnet that forms a magnetic field related to the movement path of the electric arc.

[0017] In addition, the purpose is to provide an arc-extinguishing part and an air circuit breaker including the arc-extinguishing part, wherein the magnet provided in the structure of the arc-extinguishing part does not sway randomly and can be stably kept in the original position.

[0018] In addition, the objective is to provide an arc-extinguishing section and an air circuit breaker including the arc-extinguishing section, wherein the structure of the arc-extinguishing section can ensure the extinguishing path of the generated arc even if a magnet is provided.

[0019] In addition, the objective is to provide an arc-extinguishing section and an air circuit breaker including the arc-extinguishing section, wherein the structure of the arc-extinguishing section is capable of forming a magnetic field related to the movement path of the electric arc together with the magnets present in other parts of the air circuit breaker.

[0020] Technical solutions to the problem

[0021] To achieve the above objectives, the present invention provides an arc-extinguishing part, comprising: a plurality of support plates arranged opposite to each other; a grid located between the support plates and respectively coupled to the plurality of support plates; a grid cover coupled to the grid and covering the grid; and an arc-extinguishing magnet housed inside the grid cover, the arc-extinguishing magnet forming a magnetic field in a direction from the grid cover toward the grid or from the grid toward the grid cover.

[0022] Additionally, the grid cover of the arc-extinguishing part may include: a cover body forming an internal receiving space; a mesh portion being received in the receiving space of the cover body; and a baffle plate located below the mesh portion in the receiving space of the cover body. The arc-extinguishing magnet may be received in the receiving space of the cover body and is located between the mesh portion and the baffle plate.

[0023] In addition, the grid cover of the arc extinguishing part may include an upper frame, which is combined with the cover body and covers the cover body.

[0024] In addition, the arc-extinguishing section has a plurality of grilles arranged apart from each other, and the side of the grille cover facing the grille can communicate with the space formed by the plurality of grilles spaced apart from each other.

[0025] Additionally, the grid cover of the arc-extinguishing part includes: a cover body having an internal accommodating space; and a baffle plate being accommodated in the accommodating space of the cover body and having a plurality of through holes communicating with the spaces formed by the plurality of grids spaced apart from each other. The arc-extinguishing magnet can be accommodated in the accommodating space of the cover body and is placed on the baffle plate.

[0026] Additionally, the grid cover of the arc-extinguishing section may include a magnet cover, which is accommodated in the accommodating space of the cover body and disposed on the baffle plate, and surrounds at least one of the sides of the arc-extinguishing magnet.

[0027] In addition, the magnet cover of the arc-extinguishing part can be formed of an insulating material.

[0028] Additionally, the magnet cover of the arc-extinguishing section includes: a first opening, which is formed open and is configured to overlap with and communicate with the plurality of through holes formed on the baffle plate; and a second opening, which is formed open and accommodates the arc-extinguishing magnet, wherein the first opening and the second opening can be spaced apart from each other.

[0029] In addition, the grid cover of the arc-extinguishing part includes: a mesh portion, which is accommodated in the accommodating space of the cover body and disposed on the arc-extinguishing magnet and the magnet cover. The mesh portion may include a plurality of through holes communicating with the through holes of the blocking plate.

[0030] In addition, the grid cover of the arc extinguishing part includes: an upper frame, which is combined with the cover body and covers the grid part. The upper frame may include: a through hole, which is formed through and communicates with the through hole of the grid part.

[0031] Additionally, the present invention provides an air circuit breaker comprising: a fixed contact; a movable contact movable toward or away from the fixed contact; and an arc-extinguishing portion located adjacent to the fixed contact and the movable contact, extinguishing an electric arc generated due to the separation of the fixed contact and the movable contact, the arc-extinguishing portion comprising: a plurality of support plates spaced apart from and disposed opposite to each other; a plurality of grids located between and respectively coupled to the plurality of support plates, extending between a side toward the fixed contact and the movable contact and a side opposite to the fixed contact and the movable contact; a cover body respectively coupled to the plurality of support plates, disposed adjacent to and covering the other side of the plurality of grids; and an arc-extinguishing magnet housed in a receiving space formed inside the cover body, and forming a magnetic field from the cover body toward the plurality of grids or from the plurality of grids toward the cover body.

[0032] Additionally, the air circuit breaker may include: a baffle plate, housed in the receiving space of the cover body and having the arc-extinguishing magnet disposed thereon; and a magnet cover, housed in the receiving space of the cover body and disposed thereon, surrounding the arc-extinguishing magnet.

[0033] Additionally, the baffle plate of the air circuit breaker includes a plurality of through holes communicating with the space formed by the plurality of grilles spaced apart from each other, and the magnet cover may include a first opening disposed overlapping the plurality of through holes and forming through and communicating with the plurality of through holes; and a second opening disposed spaced apart from the first opening and forming through and accommodating the arc-extinguishing magnet.

[0034] Additionally, the air circuit breaker includes: a movable contact frame electrically connected to the movable contact and extending in the opposite direction to the arc-extinguishing section, and partially exposed to the outside; and a CT (Current Transformer) magnet section covering the exposed portion of the movable contact frame. The CT magnet section may include: a housing having a space formed inside; and a CT magnet housed inside the housing and forming a magnetic field from the CT magnet section toward the arc-extinguishing section or from the arc-extinguishing section toward the CT magnet section.

[0035] In addition, the arc-extinguishing magnet and the CT magnet of the air circuit breaker can be magnetized to different polarities on their opposite sides.

[0036] Invention Effects

[0037] According to embodiments of the present invention, the following effects can be achieved.

[0038] First, an arc-extinguishing magnet is installed in the arc-extinguishing section. The arc-extinguishing magnet generates a magnetic field in the space formed between a plurality of grids arranged spaced apart from each other. The magnetic field generated by the arc-extinguishing magnet can extend to both the fixed contact and the movable contact.

[0039] The electric arc generated by the separation of the fixed and movable contacts receives an electromagnetic force directed towards the arc-extinguishing section through the magnetic field formed by the arc-extinguishing magnet. Therefore, the path of the electric arc is formed from the fixed and movable contacts, through the arc-extinguishing section, and outwards.

[0040] As a result, the generated electric arc can be quickly extinguished and moved.

[0041] Furthermore, the arc-extinguishing magnet is housed within the internal space of the cover body of the arc-extinguishing section. A baffle plate is provided between the arc-extinguishing magnet and the grid. Therefore, the arc-extinguishing magnet is not exposed to the outside of the cover body.

[0042] Therefore, the electric arc flowing along the path of the formed arc will not come into direct contact with the arc-extinguishing magnet. As a result, the arc-extinguishing magnet will not be damaged by the heat or pressure of the arc.

[0043] Furthermore, the arc-extinguishing magnet is housed within the internal space of the cover body of the arc-extinguishing section. The arc-extinguishing magnet is placed on a baffle plate. Additionally, a mesh section is provided on the side opposite to the side where the arc-extinguishing magnet is placed. That is, within the internal space of the cover body, the baffle plate, the arc-extinguishing magnet, and the mesh section are stacked sequentially.

[0044] Therefore, by placing the arc-extinguishing magnet at a location where it is not exposed to the electric arc, minimal design changes are required. Consequently, it is easy to manufacture arc-extinguishing sections and air circuit breakers that include the arc-extinguishing magnet.

[0045] Additionally, a magnet cover is disposed within the interior space of the cover body. A through-hole is formed in the magnet cover. An arc-extinguishing magnet is accommodated within this opening. A portion of the magnet cover surrounding the opening will surround the accommodated arc-extinguishing magnet.

[0046] Therefore, the upper and lower sides of the arc-extinguishing magnet, housed within the internal space of the cover body and placed on the baffle plate, are supported by the mesh portion and the baffle plate, respectively. Furthermore, the remaining sides of the arc-extinguishing magnet are surrounded by the aforementioned portion of the magnet cover. Thus, the arc-extinguishing magnet does not sway randomly and can be stably maintained in its original position.

[0047] Additionally, another opening is formed in the magnet cover. This opening communicates with a plurality of through holes formed in the baffle plate. Thus, the space formed by the plurality of grids spaced apart from each other can communicate with the outside of the arc-extinguishing part through the plurality of through holes, the opening, and the grid.

[0048] Therefore, even with the presence of an arc-extinguishing magnet and a magnet cover to support it, the path for extinguishing the generated arc will not be blocked. This ensures the extinguishing path of the generated arc.

[0049] In another embodiment, a CT magnet section is provided in the air circuit breaker. The CT magnet section includes a CT magnet that forms a magnetic field. The opposing surfaces of the arc-extinguishing magnet and the CT magnet are magnetized to different polarities. Thus, a magnetic field is formed between the arc-extinguishing magnet and the CT magnet, directed toward either the arc-extinguishing magnet or the CT magnet.

[0050] The generated electric arc receives electromagnetic force through the magnetic field. This forms a path for the arc as it is discharged outwards via the arc-extinguishing section.

[0051] Therefore, the generated electric arc can be quickly moved outward and extinguished by the magnetic field formed by the arc-extinguishing magnet and the CT magnet. Attached Figure Description

[0052] Figure 1 This is a perspective view showing an air circuit breaker according to an embodiment of the present invention.

[0053] Figure 2 It shows from Figure 1 A 3D view of the air circuit breaker with its back cover removed.

[0054] Figure 3 It shows from Figure 1 Front view of the air circuit breaker with the rear cover removed.

[0055] Figure 4 It shows from Figure 1 A top view of the air circuit breaker with the rear cover removed.

[0056] Figure 5 It shows from Figure 1 A cross-sectional view of the air circuit breaker with the rear cover removed.

[0057] Figure 6 It shows the setting Figure 1 A three-dimensional diagram of the permanent magnet in an air circuit breaker.

[0058] Figure 7 It shows the setting Figure 1 Front view of the permanent magnet of an air circuit breaker.

[0059] Figure 8 It shows the setting Figure 1 An exploded perspective view of the converter housing of an air circuit breaker.

[0060] Figure 9 It is shown Figure 8 Front view of the converter housing.

[0061] Figure 10 It shows the setting Figure 1 A perspective view of an embodiment of the arc-extinguishing section of an air circuit breaker.

[0062] Figure 11 It is shown Figure 10 A front view of one embodiment of the arc-extinguishing unit shown.

[0063] Figure 12 It is shown Figure 10 A top view of one embodiment of the arc-extinguishing section shown.

[0064] Figure 13 It is shown Figure 10 A side view of one embodiment of the arc-extinguishing unit shown.

[0065] Figure 14 It shows from Figure 10 The diagram shows the state of the arc-extinguishing section with the arc cover disassembled.

[0066] Figure 15 It shows from Figure 14 A three-dimensional view showing the state of the disassembled grid section of the arc-extinguishing part.

[0067] Figure 16 It shows from Figure 14 The top view shows the state of the arc-extinguishing section after the mesh section has been disassembled.

[0068] Figure 17 It shows from Figure 15 The diagram shows the state of the upper magnet part of the arc-extinguishing section after disassembly.

[0069] Figure 18 It shows from Figure 15The top view shows the state of the upper magnet part of the arc extinguishing section after disassembly.

[0070] Figure 19 It shows the setting Figure 1 A perspective view of another embodiment of the arc-extinguishing section of an air circuit breaker.

[0071] Figure 20 It shows the setting Figure 1 A bottom view of another embodiment of the arc-extinguishing section of an air circuit breaker.

[0072] Figure 21 It shows from Figure 19 A three-dimensional view showing the state of the arc-extinguishing section with the support plate removed.

[0073] Figure 22 It shows from Figure 19 The image shows a bottom view of the arc-extinguishing section with the support plate removed.

[0074] Figure 23 It shows from Figure 19 The front view shows the state of the arc-extinguishing section with the support plate removed.

[0075] Figure 24 It shows from Figure 19 The image shown is a three-dimensional view of the arc-extinguishing section with a portion of the grille removed.

[0076] Figure 25 It shows from Figure 19 The image shown is a bottom view of the arc-extinguishing section with a portion of the grille removed.

[0077] Figure 26 It shows from Figure 19 The left view (a) and right view (b) show the state of the arc-extinguishing section with a portion of the grille removed.

[0078] Figure 27 It shows the setting Figure 19 An exploded perspective view of the arc-extinguishing magnet section of the arc-extinguishing unit is shown.

[0079] Figure 28 This is shown from another angle. Figure 19 An exploded perspective view of the arc-extinguishing magnet section of the arc-extinguishing unit is shown.

[0080] Figure 29 It shows the setting Figure 19 The front view of the arc-extinguishing magnet section of the arc-extinguishing unit is shown.

[0081] Figure 30 It shows the setting Figure 19 The diagram shows a top view of the arc-extinguishing magnet section of the arc-extinguishing unit.

[0082] Figure 31This is a front view illustrating an example of a magnetic field formed within the framework of an embodiment of the present invention and the path of an electric arc formed therefrom.

[0083] Figure 32 This is a top view illustrating an example of a magnetic field formed within the framework of an embodiment of the present invention and the path of an electric arc formed therefrom.

[0084] Figure 33 It is shown in Figure 10 A front view of an example of the magnetic field formed by the arc-extinguishing part of the embodiment and the path of the electric arc formed therefrom.

[0085] Figure 34 It is shown in Figure 10 A cross-sectional view of another example of the magnetic field formed by the arc-extinguishing part of the embodiment and the path of the electric arc formed therefrom.

[0086] Figure 35 It is shown in Figure 10 A front view of an example of the magnetic field formed by the arc-extinguishing part of the embodiment and the path of the electric arc formed therefrom.

[0087] Figure 36 It is shown in Figure 10 A cross-sectional view of another example of the magnetic field formed by the arc-extinguishing part of the embodiment and the path of the electric arc formed therefrom.

[0088] Figure 37 It is shown in including Figure 8 The converter housing and Figure 10 A cross-sectional view of an example of the magnetic field generated by the air circuit breaker of the arc-extinguishing section in an embodiment and the path of the electric arc generated therefrom.

[0089] Figure 38 It is shown in including Figure 8 The converter housing and Figure 10 A side view of an example of the magnetic field formed by the air circuit breaker of the arc-extinguishing section in an embodiment and the path of the electric arc formed therefrom.

[0090] Figure 39 It is shown in including Figure 8 The converter housing and Figure 10 A front view of an example of the magnetic field formed by the air circuit breaker of the arc-extinguishing section in an embodiment and the path of the electric arc formed therefrom.

[0091] Figure 40 It is shown in including Figure 8 The converter housing and Figure 10 A cross-sectional view of an example of the magnetic field generated by the air circuit breaker of the arc-extinguishing section in an embodiment and the path of the electric arc generated therefrom.

[0092] Figure 41 It is shown in Figure 19A front view of an example of the magnetic field formed by the arc-extinguishing part of the embodiment and the path of the electric arc formed therefrom.

[0093] Figure 42 It is shown in Figure 19 A bottom view of an example of the magnetic field formed by the arc-extinguishing part of the embodiment and the path of the electric arc formed therefrom.

[0094] Figure 43 It is shown in Figure 19 A front view of another example of the magnetic field formed by the arc-extinguishing part of the embodiment and the path of the electric arc formed therefrom.

[0095] Figure 44 It is shown in Figure 19 A bottom view of another example of the magnetic field formed by the arc-extinguishing part of the embodiment and the path of the electric arc formed therefrom. Detailed Implementation

[0096] Hereinafter, with reference to the accompanying drawings, the arc-extinguishing part of the present invention and the air circuit breaker including the arc-extinguishing part will be described in detail.

[0097] In the following description, some of the constituent elements may be omitted in order to clarify the features of the present invention.

[0098] 1. Definition of terms

[0099] The term "energized" as used in the following instructions refers to the transfer of current or electrical signals between one or more components.

[0100] As used in the following description, the term "magnet" refers to any object capable of magnetizing a magnetic body or generating a magnetic field. In one embodiment, the magnet may be configured as a permanent magnet or an electromagnet.

[0101] The term "air circuit breaker" as used in the following description refers to a circuit breaker that uses air or compressed air to extinguish an electric arc. The following descriptions are based on the premise that they apply to air circuit breakers.

[0102] However, the configurations described below can also be applied to air circuit breakers, compressed air circuit breakers, gas circuit breakers, oil circuit breakers, and vacuum circuit breakers.

[0103] The term "Main Magnetic Field" as used in the following description refers to the magnetic field formed between a plurality of magnets arranged adjacent to each other. That is, the Main Magnetic Field (MMF) is the magnetic field formed from any one of the plurality of magnets toward another.

[0104] The term "submagnetic field" used in the following explanation refers to the magnetic field formed by any magnet itself. That is, a submagnetic field (SMF) is a magnetic field formed from one side of any magnet toward the other.

[0105] The terms “upper side,” “lower side,” “right side,” “left side,” “front side,” and “rear side” used in the following description are derived from… Figure 1 Use the coordinate system shown to understand.

[0106] 2. Description of the configuration of the air circuit breaker 10 according to an embodiment of the present invention

[0107] Reference Figures 1 to 5 The air circuit breaker 10 of this embodiment includes a cover 100, a drive part 200, and a blocking part 300.

[0108] Additionally, refer to Figures 6 to 30 The air circuit breaker 10 of this invention includes a cover magnet part 400, a CT (Current Transformer) magnet part 500, and arc extinguishing parts 600 and 700.

[0109] Hereinafter, the various components of the air circuit breaker 10 according to an embodiment of the present invention will be described with reference to the accompanying drawings, including the cover magnet part 400, and the CT magnet part 500 and the arc extinguishing parts 600 and 700 will be described separately.

[0110] (1) Explanation of the cover 100

[0111] Reference Figures 1 to 5 The air circuit breaker 10 of this embodiment includes a cover 100.

[0112] The cover 100 forms the shape of the air circuit breaker 10. In addition, the cover 100 has an internal space, so that the various components for operating the air circuit breaker 10 can be installed.

[0113] That is, the cover 100 functions as a housing.

[0114] The cover 100 may be formed of a material with high heat resistance and high rigidity. This is to prevent damage to the various components installed inside and to prevent damage from electric arcs generated inside. In one embodiment, the cover 100 may be formed of synthetic resin or reinforced plastic.

[0115] In the illustrated embodiment, the cover 100 is a rectangular prism shape with its height measured vertically. The shape of the cover 100 can be configured to accommodate any component for operating the air circuit breaker 10 internally.

[0116] The interior space of the cover 100 is electrically connected to the outside. The various components installed inside the cover 100 can be electrically connected to an external power source or load.

[0117] In the illustrated embodiment, the cover 100 includes an upper cover 110 and a lower cover 120.

[0118] The upper cover 110 forms the upper side of the cover portion 100. The upper cover 110 is located above the lower cover 120. In one embodiment, the upper cover 110 and the lower cover 120 may be integrally formed.

[0119] A space is formed inside the upper cover 110. Various components of the air circuit breaker 10 are installed in the space. In one embodiment, a blocking part 300 and an arc-extinguishing part 600, 700, etc., may be installed in the space inside the upper cover 110.

[0120] The interior space of the upper cover 110 is connected to the interior space of the lower cover 120. The components such as the blocking part 300 can be accommodated in the interior space spanning the upper cover 110 and the interior space of the lower cover 120.

[0121] Arc-extinguishing parts 600 and 700 are located on one side of the upper cover 110, i.e., the upper side in the illustrated embodiment. Arc-extinguishing parts 600 and 700 are partially exposed from the upper side of the upper cover 110. An electric arc generated within the interior space of the upper cover 110 passes through the arc-extinguishing parts 600 and 700 and is extinguished, thereby allowing it to be discharged to the outside of the air circuit breaker 10.

[0122] The fixing contact bracket 310 of the blocking part 300 is exposed on the other side of the upper cover 110, i.e., the front side of the illustrated embodiment. The fixing contact bracket 310 can be electrically connected to an external power source or load through the exposed portion.

[0123] In the illustrated embodiment, the upper cover 110 includes a first upper cover 111 and a second upper cover 112.

[0124] The first upper cover 111 is configured to cover one side of the upper part of the air circuit breaker 10, i.e., the front side in the illustrated embodiment. The first upper cover 111 can be attached to the second upper cover 112 by any fastening means.

[0125] An opening is formed in the first upper cover 111. The fixed contact holder 310 can be exposed to the outside through the opening. In the illustrated embodiment, three openings are formed in the left-right direction.

[0126] The first upper cover 111 may be provided with a cover magnet part 400. The cover magnet part 400 may be arranged in a direction that is spaced apart from each other along a plurality of arc-extinguishing parts 600, 700.

[0127] The second upper cover 112 is configured to cover the other side of the upper side of the air circuit breaker 10, i.e., the rear side in the illustrated embodiment. The second upper cover 112 is attached to the first upper cover 111 by any fastening means.

[0128] The cover magnet portion 400 may be provided on the second upper cover 112. As described above, the cover magnet portion 400 may also be provided on the first upper cover 111. That is, the cover magnet portion 400 may be provided on either the first upper cover 111 or the second upper cover 112.

[0129] The lower cover 120 forms the lower side of the cover portion 100. The lower cover 120 is located below the upper cover 110.

[0130] A space is formed inside the lower cover 120. Various components of the air circuit breaker 10 are installed in this space. In one embodiment, a drive unit 200 and a blocking unit 300, etc., may be installed in the space inside the lower cover 120.

[0131] The interior space of the lower cover 120 is connected to the interior space of the upper cover 110. Components such as the blocking part 300 can be installed in the interior spaces of the lower cover 120 and the upper cover 110.

[0132] The movable contact holder 320 of the blocking part 300 is located on one side of the lower cover 120, i.e., at the front in the illustrated embodiment. The movable contact holder 320 can be exposed to the outside through an opening formed in the lower cover 120. The movable contact holder 320 can be electrically connected to an external power source or load through the exposed portion.

[0133] The CT magnet part 500, described later, is connected to the opening of the lower cover 120, i.e., the opening exposed by the movable contact holder 320. This will be described in detail later.

[0134] (2) Description of the drive unit 200

[0135] Reference Figures 1 to 5 The air circuit breaker 10 of this embodiment includes a drive unit 200.

[0136] The drive unit 200 rotates as the fixed contact 311 and movable contact 321 of the blocking unit 300 are separated, thereby executing the trip mechanism. As a result, the air circuit breaker 10 can be cut off from external power, and the user can know that an operation to cut off power has been performed.

[0137] The drive unit 200 is housed inside the air circuit breaker 10. Specifically, the drive unit 200 is partially housed in the space inside the cover 100. In addition, the remaining portion of the drive unit 200 is housed inside a housing located on one side of the cover 100 (the rear side in the illustrated embodiment), which is not given reference numerals.

[0138] The drive unit 200 is connected to the blocking unit 300. Specifically, the crossbar 220 of the drive unit 200 is configured to rotate together with the movable contact frame 320 of the blocking unit 300.

[0139] Therefore, if the movable contact frame 320 of the blocking part 300 rotates, the drive part 200 can rotate together. The drive part 200 is rotatably housed inside the air circuit breaker 10.

[0140] In the illustrated embodiment, the drive unit 200 includes a firing device 210, a crossbar 220, and a lever 230.

[0141] The firing device 210 rotates together with the movable contact frame 320 of the blocking part 300 as it rotates away from the fixed contact frame 310. The firing device 210 is connected to the crossbar 220 and the rod 230.

[0142] Specifically, one end of the firing mechanism 210 is restricted by a crossbar 220. An elastic member is provided at the other end of the firing mechanism 210. Thus, when the fixed contact 311 and the movable contact 321 are in contact, the firing mechanism 210 applies pressure to the elastic member and stores a restoring force. The external force for applying this pressure can be provided by the crossbar 220 rotating towards the fixed contact bracket 310.

[0143] If the movable contact 321 is separated from the fixed contact 311, the movable contact holder 320 rotates away from the fixed contact holder 310. As a result, the crossbar 220 also rotates, and one end of the firing mechanism 210 is released, thereby rotating by the restoring force provided by the elastic member.

[0144] The firing device 210 is connected to the lever 230. As the firing device 210 rotates and strikes the lever 230, the lever 230 can also rotate and execute a tripping mechanism.

[0145] The crossbar 220 is connected to the movable contact bracket 320, and thus rotates together with the movable contact bracket 320. As a result, the firing device 210, which is restrained by the crossbar 220, is released, thereby enabling the tripping mechanism to be executed.

[0146] The crossbar 220 can extend between a plurality of blocking portions 300. In the illustrated embodiment, three movable contact frames 320 of the blocking portions 300 are provided and arranged in a left-right direction. The crossbar 220 can pass through and connect the plurality of movable contact frames 320 arranged in a left-right direction.

[0147] The crossbar 220 contacts one side end of the firing device 210, thereby restricting the firing device 210. If the crossbar 220 rotates together with the movable contact bracket 320, the crossbar 220 releases the one side end of the firing device 210.

[0148] The lever 230 is struck by the rotating ejector 210, thus allowing it to rotate. The lever 230 may be partially exposed on the outside of the air circuit breaker 10. When the tripping mechanism is executed by the blocking part 300, the lever 230 rotates in a predetermined direction.

[0149] Therefore, the user can easily know that the tripping mechanism has been executed. In addition, rotating the user operating lever 230 can readjust the air circuit breaker 10 to a energized state.

[0150] Since the process of executing the tripping mechanism through the drive unit 200 is a well-known technique, a detailed description thereof will be omitted.

[0151] (3) Explanation of the blocking part 300

[0152] Reference Figures 1 to 5 The air circuit breaker 10 of this embodiment includes a blocking part 300.

[0153] The blocking section 300 includes a fixed contact frame 310 and a movable contact frame 320 that are spaced apart from or in contact with each other. If the fixed contact frame 310 and the movable contact frame 320 are in contact with each other, the air circuit breaker 10 can be energized with an external power source or load. If the fixed contact frame 310 and the movable contact frame 320 are spaced apart, the air circuit breaker 10 is blocked from being energized with an external power source or load.

[0154] The blocking part 300 is housed inside the air circuit breaker 10. Specifically, the blocking part 300 is rotatably housed inside the cover part 100.

[0155] The blocking part 300 can be energized externally. In one embodiment, current can flow from an external power source or load into either the fixed contact holder 310 or the movable contact holder 320. Alternatively, current can flow out to an external power source or load in the other of the fixed contact holder 310 and the movable contact holder 320.

[0156] The blocking part 300 may be partially exposed to the outside of the air circuit breaker 10. Thus, the blocking part 300 can be energized and connected to an external power source or load via a component such as a wire (not shown).

[0157] A plurality of blocking parts 300 may be provided. The plurality of blocking parts 300 may be arranged spaced apart from each other in one direction. A partition wall may be provided between each blocking part 300 to prevent interference between the current energized to each blocking part 300.

[0158] In the illustrated embodiment, three blocking sections 300 are provided. Furthermore, the three blocking sections 300 are spaced apart from each other along the left-right direction of the air circuit breaker 10. This is because the air circuit breaker 10 in this embodiment of the invention carries three-phase currents, such as R-phase, S-phase, and T-phase, or U-phase, V-phase, and W-phase.

[0159] The number of blocking sections 300 can be varied according to the number of phases of the current energized by the air circuit breaker 10.

[0160] In the illustrated embodiment, the blocking part 300 includes a fixed contact holder 310 and a movable contact holder 320.

[0161] The fixed contact frame 310 can be in contact with or separated from the movable contact frame 320. If the movable contact frame 320 is in contact with the fixed contact frame 310, the air circuit breaker 10 can be energized with an external power source or load. If the fixed contact frame 310 and the movable contact frame 320 are separated, the energization of the air circuit breaker 10 with an external power source or load is blocked.

[0162] As the name suggests, the fixed contact holder 310 is fixedly mounted on the cover 100. Therefore, the contact and separation between the fixed contact holder 310 and the movable contact holder 320 are achieved by rotating the movable contact holder 320.

[0163] In the illustrated embodiment, the fixed contact holder 310 is housed within the interior space of the upper cover 110.

[0164] The fixed contact bracket 310 may be partially exposed to the outside of the air circuit breaker 10. Through the exposed portion, the fixed contact bracket 310 can be energizedly connected to an external power source or load.

[0165] In the illustrated embodiment, the fixed contact holder 310 is exposed to the outside through an opening formed on the front side of the upper cover 110.

[0166] The fixed contact holder 310 may be formed of a conductive material. In one embodiment, the fixed contact holder 310 may be formed of copper (Cu) or iron (Fe) and alloys thereof.

[0167] In the illustrated embodiment, the fixed contact holder 310 includes a fixed contact 311.

[0168] The fixed contact 311 can be in contact with or separated from the movable contact 321. The fixed contact 311 is located on the side of the fixed contact frame 310 facing the movable contact frame 320, i.e., the rear side in the illustrated embodiment.

[0169] Fixed contact 311 is energized with fixed contact frame 310. In the illustrated embodiment, fixed contact 311 is located on the rear side of fixed contact frame 310. In one embodiment, fixed contact 311 may be integrally formed with fixed contact frame 310.

[0170] If the fixed contact 311 is in contact with the movable contact 321, the air circuit breaker 10 can be energized and connected to an external power source or load. Alternatively, if the fixed contact 311 is separated from the movable contact 321, the energization of the air circuit breaker 10 to an external power source or load is blocked.

[0171] The movable contact frame 320 can be in contact with or separated from the fixed contact frame 310. As shown above, by the contact and separation between the movable contact frame 320 and the fixed contact frame 310, the air circuit breaker 10 can be energized with or de-energized by an external power source or load.

[0172] The movable contact holder 320 is rotatably disposed within the interior space of the cover 100. The movable contact holder 320 can rotate toward the fixed contact holder 310 and away from the fixed contact holder 310.

[0173] In the illustrated embodiment, the movable contact holder 320 is housed within the interior spaces of the upper cover 110 and the lower cover 120. As described above, the interior spaces of the upper cover 110 and the lower cover 120 are interconnected.

[0174] The movable contact holder 320 may be partially exposed to the outside of the air circuit breaker 10. Through the exposed portion, the movable contact holder 320 may be energized and connected to an external power source or load.

[0175] In the illustrated embodiment, the movable contact holder 320 is exposed to the outside through an opening formed on the front side of the lower cover 120.

[0176] The opening can be covered by the CT magnet section 500, which will be described later. Thus, the opening can be closed except for the portion of the movable contact holder 320 that is energized by an external power source or load.

[0177] The movable contact holder 320 may be formed of a conductive material. In one embodiment, the movable contact holder 320 may be formed of copper or iron and alloys thereof.

[0178] The movable contact holder 320 is connected to the drive unit 200. Specifically, the movable contact holder 320 is connected to the crossbar 220 of the drive unit 200. In one embodiment, the crossbar 220 may pass through and be coupled to the movable contact holder 320.

[0179] If the movable contact holder 320 rotates, the crossbar 220 can also rotate. Thus, as described above, the drive unit 200 can be operated to execute the tripping mechanism.

[0180] In the illustrated embodiment, the movable contact holder 320 includes a movable contact 321 and a rotation shaft 322.

[0181] The movable contact 321 can be in contact with or separated from the fixed contact 311. The movable contact 321 is located on the side of the movable contact holder 320 facing the fixed contact holder 310, i.e., the front side in the illustrated embodiment.

[0182] The movable contact 321 can rotate together with the movable contact holder 320. If the movable contact holder 320 rotates toward the fixed contact holder 310, the movable contact 321 also rotates toward the fixed contact 311, thereby making contact with the fixed contact 311.

[0183] In addition, if the movable contact holder 320 rotates away from the fixed contact holder 310, the movable contact 321 can also be separated from the fixed contact 311.

[0184] The movable contact 321 is energized with the movable contact holder 320. In the illustrated embodiment, the movable contact 321 is located on the front side of the movable contact holder 320. In one embodiment, the movable contact 321 may be integrally formed with the movable contact holder 320.

[0185] As described above, the air circuit breaker 10 is energized or blocked from external power sources or loads through the contact and separation of the movable contact 321 and the fixed contact 311.

[0186] When the fixed contact 311 and the movable contact 321 are in contact with each other and energized, an electric arc is generated if the fixed contact 311 and the movable contact 321 are separated. The air circuit breaker 10 of this embodiment includes various structures for effectively forming a path for the generated electric arc. These will be described in detail later.

[0187] The rotating shaft 322 is the part of the movable contact holder 320 that can be rotatably connected to the cover 100. The movable contact holder 320 can rotate about the rotating shaft 322 in a direction toward or away from the fixed contact holder 310.

[0188] The rotating shaft 322 is located on the opposite side of the movable contact holder 320 from the fixed contact holder 310, i.e., the rear side in the illustrated embodiment.

[0189] 3. Description of the cover magnet portion 400 according to an embodiment of the present invention

[0190] Reference Figures 6 to 7 The air circuit breaker 10 of this embodiment includes a cover magnet portion 400.

[0191] The magnet section 400 generates a magnetic field. Through this magnetic field, a path for the flow of the electric arc generated in the arc-extinguishing sections 600 and 700, namely the arc path (AP), can be formed.

[0192] The magnet cover portion 400 can be configured in any shape capable of generating a magnetic field. In one embodiment, the magnet cover portion 400 may be provided with a permanent magnet or an electromagnet, etc.

[0193] The cover magnet part 400 is combined with the upper cover 110 of the air circuit breaker 10. The cover magnet part 400 is located between and outside the plurality of arc-extinguishing parts 600 and 700.

[0194] In the illustrated embodiment, a plurality of arc-extinguishing parts 600 and 700 are located adjacent to a plurality of fixed contacts 311.

[0195] In one embodiment, the cover magnet portion 400 may be configured to be closer to the arc-extinguishing portions 600 and 700 than the plurality of fixed contacts 311. That is, the cover magnet portion 400 may be located between the fixed contacts 311 and the arc-extinguishing portions 600 and 700 in the vertical direction.

[0196] In the illustrated embodiment, one side of the cover magnet portion 400 is joined to the second upper cover 112, and the other side extends toward the first upper cover 111. That is, the cover magnet portion 400 extends in the front-rear direction.

[0197] In the embodiment, the first upper cover 111 may be recessed to form a receiving groove for accommodating the cover magnet portion 400.

[0198] Alternatively, the cover magnet portion 400 can be combined with the first upper cover 111, thereby extending toward the second upper cover 112. That is, the cover magnet portion 400 can be combined with either the first upper cover 111 or the second upper cover 112.

[0199] In the embodiment, the second upper cover 112 may be recessed to form a receiving groove for accommodating the cover magnet portion 400.

[0200] That is, the first upper cover 111 and the second upper cover 112 are respectively formed with receiving grooves for accommodating a part and the rest of the cover magnet part 400.

[0201] Therefore, if the cover magnet portion 400 is combined with the upper cover 110, the cover magnet portion 400 will not be exposed to the outside. Thus, the cover magnet portion 400 will not be damaged by the generated electric arc.

[0202] The cover magnet portion 400 can be provided in multiples. The multiple cover magnet portions 400 can be arranged spaced apart from each other. In the illustrated embodiment, there are four cover magnet portions 400.

[0203] Each cover magnet part 400 can be respectively disposed on the outer side of each of the parallel arc-extinguishing parts 600 and 700 and between each arc-extinguishing part 600 and 700.

[0204] In the illustrated embodiment, the cover magnet portion 400 includes a first cover magnet 410, a second cover magnet 420, a third cover magnet 430, and a fourth cover magnet 440.

[0205] The first cover magnet 410 is located outside the plurality of arc-extinguishing parts 600, 700. In the illustrated embodiment, the plurality of arc-extinguishing parts 600, 700 are arranged in parallel along the left-right direction.

[0206] The first cover magnet 410 is located outside (i.e., on the left) of the leftmost arc-extinguishing part 600, 700 among the plurality of arc-extinguishing parts 600, 700. The first cover magnet 410 is configured to partially cover the outside (i.e., on the left) of the leftmost arc-extinguishing part 600, 700 among the plurality of arc-extinguishing parts 600, 700.

[0207] The first cover magnet 410 can form a main magnetic field (MMF) with the second cover magnet 420. In addition, the first cover magnet 410 can form a sub-magnetic field (SMF) on its own.

[0208] The first cover magnet 410 includes a first surface 411 and a second surface 412.

[0209] The first surface 411 is defined as one side of the first cover magnet 410 facing the grid cover 630, 730 of the arc extinguishing parts 600, 700. In the illustrated embodiment, the first surface 411 forms the upper side surface of the first cover magnet 410.

[0210] The second surface 412 is defined as the opposite side of the grid cover 630, 730 of the arc extinguishing portions 600, 700 in the surface of the first cover magnet 410. In the illustrated embodiment, the second surface 412 forms the lower side surface of the first cover magnet 410.

[0211] The first surface 411 and the second surface 412 are configured to face each other. In other words, the first surface 411 and the second surface 412 are one side and the other side of the first cover magnet 410 facing each other.

[0212] The first surface 411 can be magnetized as the S pole. Additionally, the second surface 412 can be magnetized as the N pole.

[0213] That is, the first surface 411 and the second surface 412 are magnetized to opposite polarities. As a result, a subfield magnetic field (SMF) can be formed between the first surface 411 and the second surface 412.

[0214] The second cover magnet 420 is located in any one of the spaces between the plurality of arc-extinguishing parts 600, 700. In the illustrated embodiment, the second cover magnet 420 is located between the leftmost arc-extinguishing part 600, 700 and the central arc-extinguishing part 600, 700.

[0215] The second cover magnet 420 partially covers the inner side (i.e., the right side) of the leftmost arc-extinguishing part 600, 700 and the inner side (i.e., the left side) of the central arc-extinguishing part 600, 700.

[0216] The second cover magnet 420 can form a main magnetic field (MMF) with the first cover magnet 410 and the third cover magnet 430. In addition, the second cover magnet 420 can form a sub-magnetic field (SMF) on its own.

[0217] The second cover magnet 420 includes a first surface 421 and a second surface 422.

[0218] The first surface 421 is defined as one side of the second cover magnet 420 facing the grid cover 630, 730 of the arc extinguishing parts 600, 700. In the illustrated embodiment, the first surface 421 forms the upper side surface of the second cover magnet 420.

[0219] The second surface 422 is defined as the side opposite to the grid cover 630, 730 of the arc extinguishing parts 600, 700 in the surface of the second cover magnet 420. In the illustrated embodiment, the second surface 422 forms the lower side surface of the second cover magnet 420.

[0220] The first surface 421 and the second surface 422 are configured to face each other. In other words, the first surface 421 and the second surface 422 are one side and the other side of the second cover magnet 420 facing each other.

[0221] The first surface 421 can be magnetized to be the S pole. Additionally, the second surface 422 can be magnetized to be the N pole. That is, the first surface 421 and the second surface 422 are magnetized to opposite polarities. Thus, a subfield magnetic field (SMF) can be formed between the first surface 421 and the second surface 422.

[0222] The third cover magnet 430 may be located in another space among the plurality of arc-extinguishing parts 600 and 700. Specifically, the third cover magnet 430 is located between the central arc-extinguishing part 600 and 700 and the rightmost arc-extinguishing part 600 and 700 among the plurality of arc-extinguishing parts 600 and 700.

[0223] The third cover magnet 430 is configured to partially cover the inner side (i.e., the right side) of the central arc-extinguishing part 600, 700 and the inner side (i.e., the left side) of the rightmost arc-extinguishing part 600, 700.

[0224] The third cover magnet 430 can form a main magnetic field (MMF) with the second cover magnet 410 and the fourth cover magnet 440. In addition, the third cover magnet 430 can form a sub-magnetic field (SMF) on its own.

[0225] The third cover magnet 430 includes a first surface 431 and a second surface 432.

[0226] The first surface 431 is defined as one side of the third cover magnet 430 facing the grid cover 630, 730 of the arc extinguishing parts 600, 700. In the illustrated embodiment, the first surface 431 forms the upper side surface of the third cover magnet 430.

[0227] The second surface 432 is defined as the side opposite to the grid cover 630, 730 of the arc-extinguishing parts 600, 700 in the surface of the third cover magnet 430. In the illustrated embodiment, the second surface 432 forms the lower side surface of the third cover magnet 430.

[0228] The first surface 431 and the second surface 432 are configured to face each other. In other words, the first surface 431 and the second surface 432 are one side and the other side of the third cover magnet 430 facing each other.

[0229] The first surface 431 can be magnetized to be the S pole. Additionally, the second surface 432 can be magnetized to be the N pole. That is, the first surface 431 and the second surface 432 are magnetized to opposite polarities. Thus, a subfield magnetic field (SMF) can be formed between the first surface 431 and the second surface 432.

[0230] The fourth cover magnet 440 is located outside (i.e., on the right) of the rightmost arc-extinguishing part 600, 700 among the plurality of arc-extinguishing parts 600, 700. The fourth cover magnet 440 is configured to partially cover the outside (i.e., on the right) of the rightmost arc-extinguishing part 600, 700 among the plurality of arc-extinguishing parts 600, 700.

[0231] The fourth cover magnet 440 can form a main magnetic field (MMF) with the third cover magnet 430. In addition, the fourth cover magnet 440 can form a sub-magnetic field (SMF) on its own.

[0232] The fourth cover magnet 440 includes a first surface 441 and a second surface 442.

[0233] The first surface 441 is defined as one side of the fourth cover magnet 440 facing the grille covers 630 and 730 of the arc extinguishing parts 600 and 700. In the illustrated embodiment, the first surface 441 forms the upper side surface of the fourth cover magnet 440.

[0234] The second surface 442 is defined as the side opposite to the grid cover 630, 730 of the arc extinguishing parts 600, 700 in the surface of the fourth cover magnet 440. In the illustrated embodiment, the second surface 442 forms the lower side surface of the fourth cover magnet 440.

[0235] The first surface 441 and the second surface 442 are configured to face each other. In other words, the first surface 441 and the second surface 442 are one side and the other side of the fourth cover magnet 440 facing each other.

[0236] The first surface 441 can be magnetized to be the S pole. Additionally, the second surface 442 can be magnetized to be the N pole. That is, the first surface 441 and the second surface 442 are magnetized to opposite polarities. Thus, a subfield magnetic field (SMF) can be formed between the first surface 441 and the second surface 442.

[0237] The second cover magnet 420 can be formed to have a thickness greater than that of the first cover magnet 410 and the fourth cover magnet 440. As described above, the second cover magnet 420 can form a main magnetic field (MMF) with the first cover magnet 410 and the third cover magnet 430 to ensure sufficient magnetic force.

[0238] Similarly, the third cover magnet 430 can also be formed to have a thickness greater than that of the first cover magnet 410 and the fourth cover magnet 440. As described above, the third cover magnet 430 can form a main magnetic field (MMF) with the second cover magnet 420 and the fourth cover magnet 440 to ensure sufficient magnetic force.

[0239] In one embodiment, the third cover magnet 430 and the second cover magnet 420 may be formed to have the same thickness. Additionally, the first cover magnet 410 and the fourth cover magnet 440 may be formed to have the same thickness.

[0240] In this embodiment, the cover magnet portion 400 is directly coupled to the upper cover 110. This improves the ease of assembly of the air circuit breaker 10.

[0241] Furthermore, with the cover magnet portion 400 provided in this embodiment, the generated electric arc can effectively flow toward the arc extinguishing portions 600 and 700. This is achieved through the main magnetic field (MMF) and sub-magnetic field (SMF) formed by the cover magnet portion 400. This will be explained in detail later.

[0242] 4. Description of the CT (Current Transformer) magnet unit 500 according to an embodiment of the present invention

[0243] Reference Figure 1 , Figure 8 as well as Figure 9 The air circuit breaker 10 of this embodiment includes a CT magnet section 500.

[0244] The CT magnet part 500 can be detachably combined with the lower cover 120 to cover the opening of the lower cover 120 that partially exposes the movable contact holder 320.

[0245] In addition, the CT magnet section 500 includes a CT magnet 530 inside, thereby forming a magnetic field for forming an arc path (AP).

[0246] The CT magnet section 500 can be configured in multiples. In the illustrated embodiment, the openings of the movable contact holder 320 and the lower cover 120 are configured as three. Therefore, the CT magnet section 500 can also be configured as three.

[0247] A space is formed inside the CT magnet section 500. The CT magnet 530 can be accommodated in the space. When the current energized to the air circuit breaker 10 is alternating current, various components for a current transformer can be installed in the space.

[0248] The following description will be based on the premise that the air circuit breaker 10 of the present invention is energized with direct current.

[0249] In the illustrated embodiment, the CT magnet part 500 includes a housing 510, a space part 520, a CT magnet 530, and a cover part 540.

[0250] The housing 510 forms the shape of the CT magnet part 500. The housing 510 is detachably connected to the lower cover 120, thereby being configured to cover the opening of the lower cover 120.

[0251] A space 520 is formed inside the housing 510. The space 520 can accommodate the CT magnet 530. As described above, in an embodiment where alternating current is supplied to the air circuit breaker 10, various components for current conversion can be installed in the space 520.

[0252] Conversely, in the embodiment where direct current is supplied to the air circuit breaker 10, the constituent elements for current conversion are not required. Therefore, the embodiment in which the CT magnet 530 is housed in the space 520 can be understood as the case of supplying direct current to the air circuit breaker 10.

[0253] An opening is formed inside the housing 510. This opening communicates with an opening in the lower cover 120. Through this opening, the movable contact holder 320 can be exposed to the outside.

[0254] The space 520 is a space formed inside the housing 510. The space 520 can be defined as a space surrounded by the outer surface and the inner surface of the housing 510.

[0255] The space portion 520 houses the CT magnet 530. As described above, this embodiment is the case where alternating current is supplied to the air circuit breaker 10.

[0256] The space portion 520 includes an open portion. The open portion is formed on one side of the space portion 520 opposite to the cover portion 100, i.e., the front side in the illustrated embodiment. The open portion can be closed by the cover portion 540.

[0257] In the illustrated embodiment, the space portion 520 is defined as an opening that surrounds the interior of the housing 510 and is surrounded by the outer surface of the housing 510.

[0258] The space 520 may accommodate a fastening member (not shown) for attaching the housing 510 to the cover 100. Additionally, the space 520 may accommodate a fastening member for attaching the cover 540 to the housing 510.

[0259] The CT magnet 530 generates a magnetic field. Through this magnetic field, a path for the flow of the electric arc generated in the arc-extinguishing sections 600 and 700, namely the arc path (AP), can be formed.

[0260] Specifically, the CT magnet 530 forms a magnetic field from the arc-extinguishing section 600, 700 toward the CT magnet 530 or from the CT magnet 530 toward the arc-extinguishing section 600, 700.

[0261] The resulting electric arc receives electromagnetic force directed toward both sides of the grid 720 disposed in the arc-extinguishing sections 600 and 700. Therefore, the arc path (AP) is formed toward the peaks formed on both sides of the grid 720, allowing the arc to flow effectively toward the arc-extinguishing sections 600 and 700.

[0262] The CT magnet 530 can be configured in any shape capable of generating a magnetic field. In one embodiment, the CT magnet 530 can be configured as a permanent magnet or an electromagnet, etc.

[0263] The CT magnet 530 is coupled to the housing 510. Specifically, the CT magnet 530 is housed in a space 520 formed inside the housing 510. The CT magnet 530 is coupled to the side of the housing 510 facing the cover 100, i.e., the rear side of the illustrated embodiment.

[0264] In one embodiment, the CT magnet 530 may also be coupled to the surface surrounding the opening of the housing 510. In this embodiment, the CT magnet 530 can be coupled to the housing 510 more stably.

[0265] In the illustrated embodiment, the CT magnet 530 is located above the opening of the housing 510. In other words, the CT magnet 530 is located between the opening of the housing 510 and the arc-extinguishing portions 600 and 700.

[0266] Alternatively, the CT magnet 530 can be located below the opening of the housing 510. That is, the CT magnet 530 can be configured such that the opening of the housing 510 is located between the CT magnet 530 and the arc-extinguishing parts 600 and 700. In this case, the distance between the CT magnet 530 and the arc-extinguishing parts 600 and 700 is increased, thus preferably increasing the magnetic force of the CT magnet 530.

[0267] To prevent random separation and shaking of the combined CT magnet 530, fixing components such as screws or frames (not shown) may be provided.

[0268] The CT magnet 530 includes a first surface 531 and a second surface 532.

[0269] The first surface 531 can be defined as the side of the CT magnet 530 facing the arc-extinguishing parts 600 and 700. In the illustrated embodiment, the arc-extinguishing parts 600 and 700 are located on the upper side of the CT magnet 530.

[0270] Therefore, the first surface 531 can be defined as the upper surface of the CT magnet 530.

[0271] The second surface 532 can be defined as the side opposite to the arc-extinguishing parts 600 and 700 in the surface of the CT magnet 530. In other words, the second surface 532 can be defined as the lower surface of the CT magnet 530.

[0272] The first surface 531 and the second surface 532 are configured to face each other. In other words, the first surface 531 and the second surface 532 are one side and the other side of the CT magnet 530 facing each other.

[0273] The first surface 531 can be magnetized to either the N or S pole. Furthermore, the second surface 532 can be magnetized to the other polarity, either the N or S pole. That is, the first surface 531 and the second surface 532 are magnetized to opposite polarities. Thus, a subfield magnetic field (SMF) can be formed between the first surface 531 and the second surface 532.

[0274] As will be described later, an arc-extinguishing magnet 634 may be provided in the arc-extinguishing section 600 of one embodiment of the present invention. In the embodiment, a main magnetic field (MMF) may be formed between the first surface 531 and the first surface 633a of the arc-extinguishing magnet 634.

[0275] As described above, in the embodiment where DC current is supplied to the air circuit breaker 10, the constituent elements for current conversion are not required.

[0276] Therefore, in this embodiment, when the air circuit breaker 10 is energized with DC current, a CT magnet 530 is provided in the CT magnet section 500. The CT magnet 530 itself forms a sub-magnetic field (SMF), and together with the arc-extinguishing magnet 634 of the arc-extinguishing section 600, it forms a main magnetic field (MMF).

[0277] Therefore, the generated electric arc can be effectively extinguished by passing through the arc-extinguishing section 600. This will be explained in detail later.

[0278] 5. Description of the arc-extinguishing part 600 according to an embodiment of the present invention

[0279] Reference Figures 10 to 18 An air circuit breaker 10 according to an embodiment of the present invention includes an arc extinguishing section 600.

[0280] The arc extinguishing section 600 is configured to extinguish the electric arc generated by separating the fixed contact 311 and the movable contact 321. The generated electric arc can pass through the arc extinguishing section 600 and, after being extinguished and cooled, is discharged to the outside of the air circuit breaker 10.

[0281] The arc-extinguishing part 600 is joined to the cover part 100. The side of the arc-extinguishing part 600 used for extinguishing the electric arc may be exposed to the outside of the cover part 100. In the illustrated embodiment, the upper side of the arc-extinguishing part 600 is exposed to the outside of the cover part 100.

[0282] The arc-extinguishing part 600 is partially housed in the cover 100. The portion of the arc-extinguishing part 600, except for the part exposed to the outside, can be housed within the interior space of the cover 100. In the illustrated embodiment, the arc-extinguishing part 600 is partially housed on the upper side of the upper cover 110.

[0283] The configuration can be changed according to the positions of the fixed contact 311 and the movable contact 312. That is, the arc extinguishing part 600 can be located adjacent to the fixed contact 311 and the movable contact 312. Thus, an electric arc extending along the movable contact 312, which rotates away from the fixed contact 311, can easily enter the arc extinguishing part 600.

[0284] The arc-extinguishing section 600 can be configured in multiples. These multiple arc-extinguishing sections 600 can be physically and electrically separated from each other. In the illustrated embodiment, three arc-extinguishing sections 600 are provided. As described above, this is because the air circuit breaker 10 of the embodiment of the present invention is energized with three-phase current.

[0285] That is, each arc-extinguishing part 600 is located adjacent to each fixed contact 311 and movable contact 321. In the illustrated embodiment, each arc-extinguishing part 600 is located adjacent to the upper side of each fixed contact 311 and movable contact 321.

[0286] This can be understood as the arc extinguishing section 600 being constructed to extinguish the arc generated by blocking the phase current energizing each blocking section 300.

[0287] The arc-extinguishing sections 600 can be arranged adjacent to each other. In the illustrated embodiment, the three arc-extinguishing sections 600 can be arranged parallel to each other in the left-right direction of the air circuit breaker 10.

[0288] In this embodiment, the arc-extinguishing section 600 includes an arc-extinguishing magnet 634. The arc-extinguishing magnet 634 forms a main magnetic field (MMF) and a sub-magnetic field (SMF), thereby forming an arc path (AP) for the generated arc to flow effectively toward the arc-extinguishing section 600. This will be described in detail later.

[0289] In the illustrated embodiment, the arc extinguishing unit 600 includes a support plate 610, a grid 620, a grid cover 630, an arc guide 640, and an arc flow channel 650.

[0290] The support plate 610 forms both sides of the arc-extinguishing part 600, namely the right and left sides in the illustrated embodiment. The support plate 610 is combined with the various components of the arc-extinguishing part 600 to support a plurality of the aforementioned components.

[0291] Specifically, the support plate 610 is combined with the grille 620, the grille cover 630, the arc guide 640, and the arc flow channel 650.

[0292] A plurality of support plates 610 are provided. The plurality of support plates 610 can be configured to be spaced apart from each other and opposite each other. In the illustrated embodiment, two support plates 610 are provided, forming the right and left sides of the arc-extinguishing part 600, respectively.

[0293] The support plate 610 may be formed of an insulating material. This is to prevent the generated electric arc from flowing toward the support plate 610.

[0294] The support plate 610 can be formed of a heat-resistant material. This is to prevent damage or deformation caused by generated electric arcs.

[0295] A plurality of through holes are formed in the support plate 610. The grille 620 and the arc flow channel 650 can be inserted into a portion of the through holes. In addition, fastening members for securing the grille cover 630 and the arc guide 640 to the support plate 610 can pass through another portion of the through holes.

[0296] In the illustrated embodiment, the support plate 610 is configured as a plate with a plurality of edges formed at its apex. The support plate 610 may form both sides of the arc-extinguishing part 600 and may be configured in any shape capable of supporting the constituent elements of the arc-extinguishing part 600.

[0297] The support plate 610 is combined with the grille 620. Specifically, an insertion protrusion is inserted into a portion of the through hole in the support plate 610, and the insertion protrusion is disposed on both sides of the grille 620, namely the right end and the left end in the illustrated embodiment.

[0298] The support plate 610 is combined with the grille cover 630. Specifically, the grille cover 630 is combined with the upper side of the support plate 610. The combination can be achieved by assembling the support plate 610 and the grille cover 630 or by other fastening components.

[0299] The support plate 610 is coupled to the arc guide 640. Specifically, the arc guide 640 is coupled to the lower side of the support plate 610, that is, the side opposite to the grille cover 630. This coupling can be achieved by additional fastening components.

[0300] The support plate 610 is coupled to the arc flow channel 650. Specifically, the arc flow channel 650 is coupled to the rear side of the support plate 610, that is, the side opposite to the fixed contact 311. This coupling can be achieved by additional fastening components.

[0301] The grille 620 induces the electric arc generated by the fixed contact 311 and the movable contact 321 to the arc extinguishing part 600.

[0302] The induction can be achieved by the magnetic force generated by the grid 620. Alternatively, the induction can be achieved by the arc-extinguishing magnet 634 disposed in the arc-extinguishing section 600.

[0303] The grid 620 can be formed from a magnetic material. This is to exert an attractive force on the flow of electrons, i.e., the electric arc.

[0304] The grille 620 can be configured in multiples. The multiple grilles 620 can be stacked with spacing between them. In the illustrated embodiment, there are nine grilles 620, stacked in the front-to-back direction.

[0305] The number of grilles 620 can be varied. Specifically, the number of grilles 620 can be varied according to the size and performance of the arc-extinguishing section 600 or the rated capacity of the air circuit breaker 10 equipped with the arc-extinguishing section 600.

[0306] The incoming electric arc can be further divided and flowed through the space formed by the plurality of grids 620 separated from each other. As a result, the pressure of the electric arc increases, and the movement speed and extinguishing speed of the electric arc can be increased.

[0307] The arc flow channel 650 is located adjacent to the grille 620 that is furthest from the fixed contact 311 among the plurality of grilles 620, i.e., the rear grille 620 in the illustrated embodiment.

[0308] The grille 620 can be formed by protruding from its end in the width direction (i.e., the left-right direction in the illustrated embodiment) toward the fixed contact 311 (i.e., the lower side). That is, the grille 620 is formed as a peak shape with its end in the left-right direction facing downward.

[0309] As a result, the generated electric arc travels effectively toward the ends of the grid 620 in the left and right directions, and can then easily flow toward the arc-extinguishing section 600.

[0310] The arc guide 640 is located on the outer side of the left-right end of the grid 620, i.e., the lower side in the illustrated embodiment.

[0311] The grille 620 is coupled to the support plate 610. Specifically, along the width direction of the grille 620, i.e., the left-right edge in the illustrated embodiment, a plurality of coupling protrusions are formed along the extension direction of the edge, i.e., the up-down direction in the illustrated embodiment. The coupling protrusions of the grille 620 can be inserted into through holes formed in the support plate 610.

[0312] The upper end of the grille 620 facing the grille cover 630, i.e., the upper end in the illustrated embodiment, can be located adjacent to the grille cover 630. The electric arc flowing along the grille 620 can be discharged to the outside through the grille cover 630.

[0313] The grille cover 630 forms the upper side of the arc-extinguishing section 600. The grille cover 630 is configured to cover the upper end of the grille 620. An electric arc passing through the space formed by the plurality of grilles 620 spaced apart from each other can be discharged to the outside of the air circuit breaker 10 through the grille cover 630.

[0314] The grille cover 630 is joined to the support plate 610. A protrusion may be formed on the edge of the grille cover 630 in the width direction, i.e., the left-right direction in the illustrated embodiment, for inserting into a through hole in the support plate 610. Alternatively, the grille cover 630 and the support plate 610 may be joined by additional fastening members.

[0315] The grille cover 630 extends in one direction, namely the front-to-back direction in the illustrated embodiment. This can be understood as being the same direction in which the plurality of grilles 620 are stacked.

[0316] The length of the grille cover 630 in another direction, namely the width direction in the illustrated embodiment, can be determined based on the width direction length of the plurality of grilles 620.

[0317] In the illustrated embodiment, the grille cover 630 includes a cover body 631, an upper frame 632, a mesh portion 633, an arc-extinguishing magnet 634, a magnet cover 635, and a baffle plate 636.

[0318] The cover body 631 forms the shape of the grille cover 630. The cover body 631 is combined with the support plate 610. In addition, an upper frame 632 is formed on the cover body 631.

[0319] A defined space is formed inside the cover body 631. This space can be covered by the upper frame 632. The space accommodates the mesh part 633, the arc-extinguishing magnet 634, the magnet cover 635, and the baffle plate 636. Therefore, this space can be referred to as the "accommodation space".

[0320] The receiving space is connected to the space formed by the grille 620. As a result, the receiving space is connected to the interior space of the cover 100. Thus, the generated electric arc passes through the space formed by the grille 620 and can flow into the receiving space of the cover body 631.

[0321] The upper end of the grille 620 may contact the side of the cover body 631 facing the grille 620, i.e., the lower side in the illustrated embodiment. In one embodiment, the cover body 631 may support the upper end of the grille 620.

[0322] The cover body 631 can be formed of an insulating material. This is to prevent the magnetic field used to form the arc path (AP) from being distorted.

[0323] The cover body 631 can be formed of a heat-resistant material. This is to prevent damage or deformation caused by generated electric arcs.

[0324] In the illustrated embodiment, the cover body 631 is formed such that its length in the front-to-back direction is longer than its length in the left-to-right direction. The shape of the cover body 631 can be varied depending on the shape of the support plate 610 and the shape and number of the grilles 620.

[0325] The upper frame 632 is attached to the side of the cover body 631 opposite to the grille 620, i.e., the upper side in the illustrated embodiment.

[0326] The upper frame 632 is connected to the upper side of the cover body 631. The upper frame 632 is configured to cover the receiving space formed in the cover body 631 and the grid portion 633, the arc-extinguishing magnet 634, the magnet cover 635, and the baffle plate 636 contained in the receiving space.

[0327] In the illustrated embodiment, the upper frame 632 is formed such that its length in the front-to-back direction is longer than its length in the left-to-right direction. The upper frame 632 is stably coupled to the upper side of the cover body 631, thereby allowing it to be configured in any shape capable of covering the receiving space and the constituent elements received within the receiving space.

[0328] A plurality of through holes are formed in the upper frame 632. Electric arcs that have passed through and extinguished between the grids 620 can be discharged through these through holes. In the illustrated embodiment, the through holes are arranged in three rows along the front-to-back direction, with three through holes in each row along the left-to-right direction, forming a total of nine through holes. The number of through holes can be varied.

[0329] The through holes are spaced apart from each other. A rib is formed between the through holes. The rib can pressurize the mesh portion 633, the arc-extinguishing magnet 634, the magnet cover 635, and the baffle plate 636, which are housed in the space of the cover body 631, from above.

[0330] Therefore, even if an electric arc is generated, the mesh part 633, the arc-extinguishing magnet 634, the magnet cover 635, and the blocking plate 636 will not randomly detach from the receiving space of the cover body 631.

[0331] The upper frame 632 can be fixedly connected to the upper side of the cover body 631. In the illustrated embodiment, the upper frame 632 can be fixedly connected to the upper side of the cover body 631 by fastening members.

[0332] The mesh section 633, the arc-extinguishing magnet 634, the magnet cover 635, and the baffle plate 636 are located between the upper frame 632 and the cover body 631, that is, the receiving space of the cover body 631 on the lower side of the upper frame 632.

[0333] In other words, in the receiving space of the cover body 631, the mesh part 633, the arc-extinguishing magnet 634, the magnet cover 635, and the baffle plate 636 are stacked from top to bottom.

[0334] The mesh section 633 performs the function of filtering impurities remaining in the extinguished electric arc that passes through the space formed between the grids 620. The extinguished electric arc can pass through the mesh section 633, and the remaining impurities are discharged to the outside after being filtered.

[0335] That is, the mesh section 633 is used as a filter.

[0336] The mesh section 633 includes a plurality of through holes. The size, i.e., the diameter, of the through holes is preferably formed to be smaller than the diameter of the particles of impurities remaining in the electric arc. Furthermore, the diameter of the through holes is preferably formed to be sufficient to allow the gas contained in the electric arc to pass through.

[0337] The grid section 633 can be configured in multiple ways. The multiple grid sections 633 can be stacked in the vertical direction. As a result, impurities remaining in the electric arc passing through the grid section 633 can be effectively removed.

[0338] The mesh portion 633 is accommodated within the accommodating space formed inside the cover body 631. The shape of the mesh portion 633 can be determined according to the shape of the accommodating space.

[0339] The grid section 633 is located on the lower side of the upper frame 632. A plurality of through holes formed in the grid section 633 are connected to a plurality of through holes formed in the upper frame 632. Thus, an electric arc passing through the grid section 633 can pass through the upper frame 632 and be discharged to the outside.

[0340] The plurality of through holes formed in the grid portion 633 are connected to the space formed by the grid 620. As a result, the plurality of through holes formed in the grid portion 633 are connected to the internal space of the cover portion 100.

[0341] The arc-extinguishing magnet 634, the magnet cover 635, and the baffle plate 636 are located on the lower side of the mesh section 633.

[0342] The arc-extinguishing magnet 634 generates a magnetic field, which creates an electromagnetic force to direct the generated electric arc toward the arc-extinguishing part 600. The arc-extinguishing magnet 634 is housed within the receiving space of the cover body 631.

[0343] The arc-extinguishing magnet 634 is located below the mesh portion 633. Additionally, the arc-extinguishing magnet 634 is located above the baffle plate 636. In one embodiment, the arc-extinguishing magnet 634 may be mounted on the baffle plate 636.

[0344] The arc-extinguishing magnet 634 can be configured in any shape capable of generating a magnetic field. In one embodiment, the arc-extinguishing magnet 634 can be configured as a permanent magnet or an electromagnet.

[0345] The arc-extinguishing magnet 634 can be formed to a specified size. Specifically, as described later, a plurality of through holes 636a are formed in the baffle plate 636. The arc-extinguishing magnet 634 is preferably formed to a size that does not cover the through holes 636a formed in the baffle plate 636.

[0346] In the illustrated embodiment, the arc-extinguishing magnet 634 is rectangular in shape. The arc-extinguishing magnet 634 is formed to be less than half the length of the baffle plate 636 in the front-to-back direction. Furthermore, the arc-extinguishing magnet 634 is formed to be shorter than the length of the baffle plate 636 in the width direction.

[0347] The arc-extinguishing magnet 634 can be configured to have any size and shape without obstructing the through hole 636a. For example, the arc-extinguishing magnet 634 can be formed to have a width that is the same as the length in the width direction of the baffle plate 636.

[0348] In the illustrated embodiment, the arc-extinguishing magnet 634 is located on the front side of the receiving space of the cover body 631. In other words, the arc-extinguishing magnet 634 is located in the receiving space of the cover body 631 at a position opposite to the position formed by the plurality of through holes 636a.

[0349] The arc-extinguishing magnet 634 can be positioned at any location that does not obstruct the plurality of through holes 636a.

[0350] The arc-extinguishing magnet 634 is supported by the magnet cover 635. Specifically, the arc-extinguishing magnet 634 is inserted into the second opening 635b formed in the magnet cover 635.

[0351] Therefore, the vertical sway of the arc-extinguishing magnet 634 is limited by the upper frame 632, the mesh portion 633, and the baffle plate 636. In addition, the horizontal and vertical sway of the arc-extinguishing magnet 634 is limited by the magnet cover 635.

[0352] The arc-extinguishing magnet 634 includes a first surface 634a and a second surface 634b.

[0353] The first surface 634a forms one side of the arc-extinguishing magnet 634 facing the grid portion 633. In other words, the first surface 634a forms one side of the arc-extinguishing magnet 634 opposite to the grid 620. In the illustrated embodiment, the first surface 634a can be defined as the upper surface of the arc-extinguishing magnet 634.

[0354] The second surface 634b forms the other side of the arc-extinguishing magnet 634 facing the baffle plate 636. In other words, the second surface 634b forms the other side of the arc-extinguishing magnet 634 facing the grille 620. In the illustrated embodiment, the second surface 634b can be defined as the lower surface of the arc-extinguishing magnet 634.

[0355] The first surface 634a and the second surface 634b are configured to face each other. In other words, the first surface 634a and the second surface 634b are one side and the other side of the arc-extinguishing magnet 634 facing each other.

[0356] The first surface 634a can be magnetized to either the N or S pole. Furthermore, the second surface 634b can be magnetized to the other polarity, either the N or S pole. That is, the first surface 634a and the second surface 634b are magnetized to opposite polarities. Thus, a subfield magnetic field (SMF) can be formed between the first surface 634a and the second surface 634b.

[0357] As described above, the CT magnet section 500 of this embodiment includes a CT magnet 530. In this embodiment, a main magnetic field (MMF) can be formed between the second surface 634b and the first surface 531 of the CT magnet section 500.

[0358] The process of forming the main magnetic field (MMF) and the sub-magnetic field (SMF) by the arc-extinguishing magnet 634 will be described in detail later.

[0359] The magnet cover 635 supports the arc-extinguishing magnet 634 so that the arc-extinguishing magnet 634, which is placed in the baffle plate 636, does not move randomly in the baffle plate 636.

[0360] The magnet cover 635 is located below the mesh portion 633. Additionally, the magnet cover 635 is located above the baffle plate 636. The magnet cover 635 can be mounted on the baffle plate 636.

[0361] As described above, the arc-extinguishing magnet 634 can also be mounted on the baffle plate 636. That is, the magnet cover 635 can be located on the same plane as the arc-extinguishing magnet 634.

[0362] The magnet cover 635 includes a plurality of openings. In the illustrated embodiment, the magnet cover 635 includes a first opening 635a formed on the rear side and a second opening 635b formed on the front side.

[0363] Either the first opening 635a or the second opening 635b of the magnet cover 635, in the illustrated embodiment, the first opening 635a formed on the rear side communicates with the through hole 636a formed in the baffle plate 636. The electric arc passing through the through hole 636a passes through the first opening 635a and through the baffle plate 636, thereby allowing it to flow toward the mesh portion 633.

[0364] The arc-extinguishing magnet 634 is located in the other of the first opening 635a and the second opening 635b of the magnet cover 635, namely the second opening 635b formed on the front side in the illustrated embodiment. The edges of the magnet cover 635 surrounding the second opening 635b formed on the front side of the magnet cover 635 surround the arc-extinguishing magnet 634.

[0365] The second opening 635b formed on the front side of the magnet cover 635 can be shaped to correspond to the shape of the arc-extinguishing magnet 634. In the illustrated embodiment, the arc-extinguishing magnet 634 has a rectangular cross-section extending in both the front-back and left-right directions.

[0366] Therefore, the second opening 635b formed on the front side of the magnet cover 635 can also be formed as a rectangular cross-section extending in the front-back direction and the left-right direction.

[0367] With the magnet cover 635 in place, the arc-extinguishing magnet 634 will not sway in the front-back or left-right directions when it is positioned on the baffle plate 636. At the same time, the electric arc passing through the opening formed in the magnet cover 635 and through the through hole 636a of the baffle plate 636 can flow towards the grid section 633.

[0368] The magnet cover 635 may be formed of a heat-resistant material. This is to prevent damage or deformation caused by electric arcs passing through the through-hole 636a of the baffle plate 636.

[0369] The magnet cover 635 may be formed of an insulating material. This is to prevent the magnetic field forming the arc-extinguishing magnet 634 from being disturbed, or the flowing electric arc from being attracted by the magnet cover 635.

[0370] In one embodiment, the magnet cover 635 may be formed of a material such as reinforced plastic or acrylic.

[0371] The baffle plate 636 is located on the underside of the magnet cover 635.

[0372] A baffle plate 636 supports the arc-extinguishing magnet 634 and the magnet cover 635 from below. Thus, the arc-extinguishing magnet 634, housed within the interior space of the cover body 631, is not exposed to the generated electric arc. This prevents damage to the arc-extinguishing magnet 634 due to the electric arc.

[0373] Additionally, the baffle plate 636 provides a pathway for the electric arc to flow toward the grid portion 633 through the space formed between the grids 620.

[0374] The baffle plate 636 is accommodated in the accommodating space of the cover body 631. The baffle plate 636 is located at the lowermost side in the accommodating space of the cover body 631.

[0375] In the illustrated embodiment, the baffle plate 636 is formed as a rectangular cross-section with a length in the front-to-back direction longer than its length in the left-to-right direction. The shape of the baffle plate 636 can be varied according to the shape of the cross-section of the receiving space of the cover body 631.

[0376] The grille 620 is located below the baffle plate 636. In one embodiment, the upper end of the grille 620, i.e., the end of the grille 620 facing the baffle plate 636, may contact the baffle plate 636.

[0377] The baffle plate 636 includes a through hole 636a.

[0378] The through-hole 636a is a passageway for an electric arc to flow into the receiving space of the cover body 631 through the space formed by the plurality of grilles 620 spaced apart from each other. The through-hole 636a is formed in a direction perpendicular to the baffle plate 636, i.e., in the vertical direction in the illustrated embodiment.

[0379] The through hole 636a can be formed in multiples. The multiple through holes 636a can be arranged spaced apart from each other.

[0380] The through hole 636a can be located on one side of the baffle plate 636. In the illustrated embodiment, the through hole 636a is located in the opposite direction to the arc-extinguishing magnet 634, i.e., on the rear side of the baffle plate 636.

[0381] The through hole 636a can be positioned anywhere that is not blocked by the arc-extinguishing magnet 634 and communicates with the first opening 635a formed in the magnet cover 635. The through hole 636a communicates with the first opening 635a.

[0382] The arc guide 640 induces an electric arc so that the generated arc flows toward the grid 620. The arc guide 640 prevents the generated arc from flowing toward the support plate 610 and damaging the support plate 610.

[0383] Arc guide 640 is located on the side of support plate 610 facing fixed contact 311 and movable contact 321. In the illustrated embodiment, arc guide 640 is located on the underside of support plate 610.

[0384] A plurality of arc guides 640 may be provided. The plurality of arc guides 640 may be coupled to each support plate 610. In the illustrated embodiment, two arc guides 640 are provided, thereby coupling to each support plate 610 respectively. The two arc guides 640 are configured to face each other.

[0385] The arc guide 640 is coupled to the support plate 610. This coupling can be achieved by additional fastening components.

[0386] The arc guide 640 can be formed of a heat-resistant material. This is to prevent damage and deformation caused by the generated arc. In one embodiment, the arc guide 640 can be formed of a ceramic material.

[0387] The arc guide 640 is configured to partially surround the pointed portions of the left-right ends formed on both sides of the grid 620, i.e., the ends in the illustrated embodiment. Thus, the arc guided by the arc guide 640 may not be concentrated in any part of the grid 620.

[0388] The arc guide 640 can extend along the extension direction of the support plate 610, i.e., the front-to-back direction in the illustrated embodiment. That is, the arc guide 640 can extend between the frontmost grille 620 and the rearmost grille 620.

[0389] The arc guide 640 includes a first extension 641 and a second extension 642.

[0390] The first extension 641 is the portion where the arc guide 640 is joined to the support plate 610. The first extension 641 is located on the side of the support plate 610 facing the fixed contact frame 310, i.e., the lower side in the illustrated embodiment. The first extension 641 can be joined to the support plate 610 by a fastening member.

[0391] The first extension 641 extends toward the grille 620, i.e., upward in the illustrated embodiment. In one embodiment, the first extension 641 may contact and extend with the support plate 610. In another embodiment, the first extension 641 may extend parallel to the support plate 610.

[0392] The second extension 642 extends from the end of the first extension 641.

[0393] The second extension 642 is formed as a pointed portion partially surrounding the left-right end of the grille 620. The second extension 642 extends at a predetermined angle to the first extension 641. In one embodiment, the second extension 642 may extend at an obtuse angle to the first extension 641.

[0394] In another embodiment, the second extension 642 may extend parallel to the pointed portion formed at the left-right end of the grille 620.

[0395] The arc flow channel 650 induces an electric arc so that the generated arc flows toward the grid 620. The arc guide 640 prevents the generated arc from crossing the grid 620 and traveling toward one side wall of the cover 100. Thus, damage to the cover 100 due to the generated arc can be prevented.

[0396] The arc flow channel 650 is located on the side of the support plate 610 facing the fixed contact 311 and the movable contact 321. In the illustrated embodiment, the arc flow channel 650 is located on the underside of the support plate 610.

[0397] The arc flow channel 650 is located on the opposite side of the support plate 610 from the fixed contact 311. Specifically, the arc flow channel 650 is located on the rear side of the lower side of the support plate 610, opposite to the fixed contact 311 located on the front side of the support plate 610.

[0398] The arc flow channel 650 is combined with the support plate 610. The combination is formed by inserting a protrusion formed at the left and right ends of the arc flow channel 650 into a through hole formed in the support plate 610.

[0399] The arc flow channel 650 can be formed of a conductive material. This is to apply an attractive force to the flowing arc, thereby effectively inducing the arc. In one embodiment, the arc flow channel 650 can be formed of copper, or iron, or an alloy containing them.

[0400] The arc flow channel 650 extends a predetermined length toward the grille 620. In one embodiment, the arc flow channel 650 may be configured to cover the grille 620 located furthest from the fixed contact 311 from the rear side, i.e., the grille 620 located on the rearmost side in the illustrated embodiment.

[0401] Therefore, the electric arc does not extend beyond the grille 620 located on the rearmost side, thus preventing damage to the cover 100. Furthermore, the generated electric arc can be effectively induced towards the grille 620.

[0402] 6. Description of the arc-extinguishing section 700 according to another embodiment of the present invention

[0403] Reference Figures 19 to 30 In another embodiment of the present invention, the air circuit breaker 10 includes an arc-extinguishing section 700.

[0404] The arc-extinguishing section 700 is configured to extinguish the electric arc generated by the fixed contact 311 and the movable contact 321. After the generated electric arc passes through the arc-extinguishing section 700 and is extinguished and cooled, it can be discharged to the outside of the air circuit breaker 10.

[0405] The arc-extinguishing part 700 is joined to the cover part 100. The side of the arc-extinguishing part 700 used for extinguishing the electric arc may be exposed to the outside of the cover part 100. In the illustrated embodiment, the upper side of the arc-extinguishing part 700 is exposed to the outside of the cover part 100.

[0406] The arc-extinguishing part 700 is partially housed in the cover 100. The remaining portion of the arc-extinguishing part 700, excluding the externally exposed portion, can be housed within the interior space of the cover 100. In the illustrated embodiment, the arc-extinguishing part 700 is partially housed on the upper side of the upper cover 110.

[0407] The configuration can be changed according to the positions of the fixed contact 311 and the movable contact 312. That is, the arc extinguishing part 700 can be located adjacent to the fixed contact 311 and the movable contact 312. As a result, the electric arc formed by extending along the movable contact 312, which is rotated away from the fixed contact 311, can easily enter the arc extinguishing part 700.

[0408] The arc-extinguishing section 700 can be configured in multiples. These multiple arc-extinguishing sections 700 can be physically and electrically separated from each other. In the illustrated embodiment, three arc-extinguishing sections 700 are provided. As described above, this is because the air circuit breaker 10 of the embodiment of the present invention is energized with three-phase current.

[0409] That is, each arc-extinguishing part 700 is located adjacent to each fixed contact 311 and movable contact 321. In the illustrated embodiment, each arc-extinguishing part 700 is located adjacent to the upper side of each fixed contact 311 and movable contact 321.

[0410] Each arc-extinguishing section 700 is understood to be constructed to extinguish the electric arc generated by blocking the current in each phase energized by each blocking section 300.

[0411] The arc-extinguishing sections 700 can be arranged adjacent to each other. In the illustrated embodiment, three arc-extinguishing sections 700 are arranged parallel to each other in the left-right direction of the air circuit breaker 10.

[0412] In this embodiment, the arc-extinguishing section 700 includes a first arc-extinguishing magnet section 771, a second arc-extinguishing magnet section 772, and a third arc-extinguishing magnet section 773. The first arc-extinguishing magnet section 771, the second arc-extinguishing magnet section 772, and the third arc-extinguishing magnet section 773 form a main magnetic field (MMF) and a sub-magnetic field (SMF), thereby forming an arc path (AP) for the generated arc to flow effectively toward the arc-extinguishing section 700. This will be described in detail later.

[0413] In the illustrated embodiment, the arc-extinguishing part 700 includes a support plate 710, a grid 720, a grid cover 730, an arc guide 740, an arc flow channel 750, a magnet housing 760, and an arc-extinguishing magnet part 770.

[0414] The support plate 710 forms both sides of the arc-extinguishing part 700, namely the right and left sides in the illustrated embodiment. The support plate 710 is combined with each component of the arc-extinguishing part 700 and supports a plurality of the aforementioned components.

[0415] Specifically, the support plate 710 is combined with the grille 720, the grille cover 730, the arc guide 740, and the arc flow channel 750. In addition, the support plate 710 is combined with the magnet housing 760.

[0416] A plurality of support plates 710 are provided. The plurality of support plates 710 can be spaced apart from each other and arranged opposite to each other. In the illustrated embodiment, two support plates 710 are provided, forming the right and left sides of the arc-extinguishing part 700, respectively.

[0417] The support plate 710 can be formed of an insulating material. This is to prevent the generated electric arc from flowing toward the support plate 710.

[0418] The support plate 710 can be formed of a heat-resistant material. This is to prevent damage or deformation caused by generated electric arcs.

[0419] A plurality of through holes are formed in the support plate 710. A portion of the through holes can be used to insert and combine the grille 720 and the arc flow channel 750.

[0420] Additionally, another portion of the through hole may be fitted with a fastening member that secures the grille cover 730 and the arc guide 740 to the support plate 710.

[0421] Furthermore, another portion of the through hole may be fitted with fastening members 762c and 763c for fastening the second arc-extinguishing magnet portion 772 to the third arc-extinguishing magnet portion 773 to the support plate 710.

[0422] In the illustrated embodiment, the support plate 710 is configured as a plate with a plurality of edges formed at its apex. The support plate 710 forms both sides of the arc-extinguishing part 700 and can be configured in any shape capable of supporting the constituent elements of the arc-extinguishing part 700.

[0423] The support plate 710 is combined with the grille 720. Specifically, a portion of the through hole in the support plate 710 is fitted with an insertion protrusion, which is disposed on both sides of the grille 720, namely the right end and the left end in the illustrated embodiment.

[0424] The support plate 710 is combined with the grille cover 730. Specifically, the grille cover 730 is combined with the upper side of the support plate 710. The combination can be achieved by assembling the support plate 710 and the grille cover 730 or by other fastening components.

[0425] The support plate 710 is coupled to the arc guide 740. Specifically, the arc guide 740 is coupled to the lower side of the support plate 710, that is, the side opposite to the grille cover 730. This coupling can be achieved by additional fastening components.

[0426] The support plate 710 is coupled to the arc flow channel 750. Specifically, the arc flow channel 750 is coupled to the rear side of the support plate 710, that is, the side opposite to the fixed contact 311. This coupling can be achieved by additional fastening components.

[0427] The support plate 710 is coupled to the magnet housing 760. Specifically, the support plate 710 can be coupled to the second receiving portion 762 and the third receiving portion 763 of the magnet housing 760 via the second fastening member 762c and the third fastening member 763c.

[0428] The grille 720 induces the electric arc generated by the fixed contact 311 and the movable contact 321 to the arc extinguishing part 700.

[0429] The induction can be achieved by the magnetic force generated by the grid 720. Alternatively, the induction can be achieved by the arc-extinguishing magnet 770 provided in the arc-extinguishing section 700.

[0430] The grid 720 can be formed from a magnetic material. This is to exert an attractive force on the flow of electrons, i.e., the electric arc.

[0431] The grille 720 can be configured in multiples. The multiple grilles 720 can be stacked with spacing between them. In the illustrated embodiment, there are ten grilles 720, stacked in the front-to-back direction.

[0432] The electric arc flowing through the space formed by the plurality of grids 720 separated from each other can be further divided and flowed. As a result, the pressure of the electric arc can be increased, and the movement speed and extinguishing speed of the electric arc can be increased.

[0433] The arc flow channel 750 is located adjacent to the grille 720 that is furthest from the fixed contact 311 among the plurality of grilles 720, i.e., the rear grille 720 in the illustrated embodiment.

[0434] The grille 720 can be formed by protruding downwards from its end in the width direction (left-right direction in the illustrated embodiment) toward the fixed contact 311. That is, the grille 720 is formed as a peak shape with its end facing downwards in the left-right direction.

[0435] As a result, the generated electric arc travels effectively toward the ends of the grid 720 in the left and right directions, and can then easily flow toward the arc-extinguishing section 700.

[0436] The arc guide 740 is located on the outer side of the left-right end of the grid 720, i.e., the lower side in the illustrated embodiment.

[0437] The grille 720 is coupled to the support plate 710. Specifically, in the width direction of the grille 720, i.e., the left-right edge in the illustrated embodiment, a plurality of coupling protrusions are formed along the edge extension direction, i.e., the up-down direction in the illustrated embodiment. The coupling protrusions of the grille 720 are inserted into the through holes formed in the support plate 710.

[0438] A portion of the plurality of grilles 720 is inserted into the grille joint 764 of the magnet housing 760.

[0439] Specifically, one side of a portion of the plurality of grilles 720, i.e. the lower end in the illustrated embodiment, is inserted into the grille joint 764 of the magnet housing 760.

[0440] As described above, the grille 720 is located above the fixed contact 311, so that the side of each layer of the grille 720 facing the fixed contact 311 can be inserted into the grille joint 764.

[0441] The magnet housing 760, which houses the arc-extinguishing magnet section 770 for forming the arc, is coupled to one or more of the plurality of grids 720. Specifically, the lower end of one or more of the plurality of grids 720 can be inserted into the grid coupling portion 764 formed in the magnet housing 760.

[0442] In the illustrated embodiment, the lower ends of the two grilles 720 located in the center in the front-rear direction, namely the two grilles 720 located at the fifth and sixth distances from the front side, are inserted into the grille joint 764.

[0443] In addition, a second receiving portion 762 and a third receiving portion 763 are combined on both sides of the two grilles 720, i.e., in the left-right direction of the illustrated embodiment.

[0444] That is, in the illustrated embodiment, a second receiving portion 762 is joined to the left side of the two grilles 720 located in the center in the front-rear direction, specifically between the fifth and sixth grilles 720 on the front side. Additionally, a third receiving portion 763 is joined to the right side between the two grilles 720.

[0445] The side of the grille 720 facing the grille cover 730, i.e., the upper end in the illustrated embodiment, can be located adjacent to the grille cover 730. An electric arc flowing along the grille 720 can pass through the grille cover 730 and be discharged to the outside.

[0446] The grille cover 730 is formed on the upper side of the arc extinguishing part 700. The grille cover 730 is configured to cover the upper end of the grille 720. An electric arc passing through the space formed by the plurality of grilles 720 spaced apart from each other can pass through the grille cover 730 and be discharged to the outside of the air circuit breaker 10.

[0447] The grille cover 730 is joined to the support plate 710. A protrusion may be formed on the edge of the grille cover 730 in the width direction, i.e., the left-right direction in the illustrated embodiment, for inserting into a through hole in the support plate 710. Alternatively, the grille cover 730 and the support plate 710 may be joined by additional fastening members.

[0448] The grille cover 730 extends in one direction, namely the front-to-back direction in the illustrated embodiment. This direction is to be understood as being the same as the direction in which the plurality of grilles 720 are stacked.

[0449] The length of the grille cover 730 in another direction, namely the width direction in the illustrated embodiment, can be determined based on the width direction length of the plurality of grilles 720.

[0450] In the illustrated embodiment, the grille cover 730 includes a cover body 731, an upper frame 732, and a mesh portion 733.

[0451] The cover body 731 forms the shape of the grille cover 730. The cover body 731 is combined with the support plate 710. In addition, an upper frame 732 is combined with the cover body 731.

[0452] A defined space is formed inside the cover body 731. This space can be covered by the upper frame 732. A grid portion 733 is accommodated in this space. Therefore, this space can be referred to as a "accommodating space".

[0453] The receiving space is connected to the space formed by the grille 720. As a result, the receiving space is connected to the interior space of the cover 100. Thus, the generated electric arc can flow through the space formed by the grille 720 into the receiving space of the cover body 731.

[0454] The side of the cover body 731 facing the grille 720, i.e., the lower side in the illustrated embodiment, can contact the upper end of the grille 720. In one embodiment, the cover body 731 can support the upper end of the grille 720.

[0455] The cover body 731 can be formed of an insulating material. This is to prevent the magnetic field from being distorted along the path (AP) where an electric arc is formed.

[0456] The cover body 731 can be formed of a heat-resistant material. This is to prevent damage or deformation caused by generated electric arcs.

[0457] In the illustrated embodiment, the cover body 731 is formed such that its length in the front-to-back direction is longer than its length in the left-to-right direction. The shape of the cover body 731 can be varied depending on the shape of the support plate 710 and the shape and number of the grilles 720.

[0458] The upper frame 732 is attached to the side of the cover body 731 opposite to the grille 720, i.e., the upper side in the illustrated embodiment.

[0459] The upper frame 732 is joined to the upper side of the cover body 731. The upper frame 732 is configured to cover the receiving space formed in the cover body 731 and the grid portion 733 received in the receiving space.

[0460] In the illustrated embodiment, the upper frame 732 is formed such that its length in the front-to-back direction is longer than its length in the left-to-right direction. The upper frame 732 can be configured to be stably attached to the upper side of the cover body 731 and can cover any shape of the receiving space and the constituent elements received in the receiving space.

[0461] A plurality of through holes are formed in the upper frame 732. Electric arcs that pass through these through holes, pass between the grids 720, and are extinguished can be discharged. In the illustrated embodiment, the through holes are arranged in three rows along the front-to-back direction, with three through holes in each row along the left-to-right direction, forming a total of nine. The number of through holes can be varied.

[0462] The through holes are spaced apart from each other. A rib is formed between the through holes. The rib presses down on the mesh portion 733, which is housed in the space of the cover body 731, from above.

[0463] Therefore, even if an electric arc is generated, the mesh portion 733 will not randomly detach from the receiving space of the cover body 731.

[0464] The upper frame 732 can be fixedly attached to the upper side of the cover body 731. In the illustrated embodiment, the upper frame 732 is fixedly attached to the upper side of the cover body 731 by fastening members.

[0465] The mesh portion 733 is located between the upper frame 732 and the cover body 731, that is, the receiving space of the cover body 731 on the lower side of the upper frame 732.

[0466] The mesh section 733 removes residual impurities from the extinguished electric arc that passes through the space formed between the grids 720. The extinguished electric arc can pass through the mesh section 733 and is discharged to the outside after the residual impurities are removed.

[0467] That is, the mesh section 733 is used as a filter.

[0468] The mesh section 733 includes a plurality of through holes. The size, i.e., the diameter, of the through holes is preferably smaller than the diameter of particles containing impurities remaining in the electric arc. Furthermore, the diameter of the through holes is preferably large enough to allow the gas contained in the electric arc to pass through.

[0469] The grid section 733 can be configured in multiple ways. The multiple grid sections 733 can be stacked in the vertical direction. As a result, impurities remaining in the electric arc passing through the grid section 733 can be effectively removed.

[0470] The mesh portion 733 is accommodated within the accommodating space formed inside the cover body 731. The shape of the mesh portion 733 can be determined according to the shape of the accommodating space.

[0471] The grid section 733 is located on the lower side of the upper frame 732. A plurality of through holes formed in the grid section 733 are connected to a plurality of through holes formed in the upper frame 732. Thus, an electric arc passing through the grid section 733 can pass through the upper frame 732 and be discharged to the outside.

[0472] The plurality of through holes formed in the grid portion 733 are connected to the space formed by the grille 720. As a result, the plurality of through holes formed in the grid portion 733 are connected to the internal space of the cover portion 100.

[0473] Although not shown, the baffle plate (not shown) may be located below the mesh portion 733. A plurality of through holes (not shown) are formed in the baffle plate (not shown), and the mesh portion 733 may communicate with the interior space of the cover portion 100.

[0474] The arc guide 740 induces an electric arc so that the generated arc flows toward the grid 720. The arc guide 740 prevents the generated arc from flowing toward the support plate 710 and damaging the support plate 710.

[0475] The arc guide 740 is located on the side of the support plate 710 facing the fixed contact 311 and the movable contact 321. In the illustrated embodiment, the arc guide 740 is located on the underside of the support plate 710.

[0476] A plurality of arc guides 740 may be provided. The plurality of arc guides 740 may be coupled to each support plate 710. In the illustrated embodiment, two arc guides 740 are provided, each coupled to a support plate 710. The two arc guides 740 are configured to face each other.

[0477] The arc guide 740 is coupled to the support plate 710. This coupling can be achieved by additional fastening components.

[0478] The arc guide 740 can be formed of a heat-resistant material. This is to prevent damage and deformation caused by the generated arc. In one embodiment, the arc guide 740 can be formed of a ceramic material.

[0479] The arc guide 740 is configured to partially surround the pointed portions of the left and right ends formed on both sides of the grille 720, i.e., the ends in the illustrated embodiment. Thus, the arc guided by the arc guide 740 may not be concentrated on any part of the grille 720.

[0480] The arc guide 740 can extend along the extension direction of the support plate 710, i.e., the front-to-back direction in the illustrated embodiment. That is, the arc guide 740 can extend between the frontmost grille 720 and the rearmost grille 720.

[0481] The arc guide 740 includes a first extension 741 and a second extension 742.

[0482] The first extension 741 is the portion of the arc guide 740 that is attached to the support plate 710. The first extension 741 is located on the side of the support plate 710 facing the fixed contact frame 310, i.e., the lower side in the illustrated embodiment. The first extension 741 can be attached to the support plate 710 by a fastening member.

[0483] The first extension 741 extends toward the grille 720, i.e., upward in the illustrated embodiment. In one embodiment, the first extension 741 may contact and extend with the support plate 710. In another embodiment, the first extension 741 may extend parallel to the support plate 710.

[0484] The second extension 742 extends from the end of the first extension 741.

[0485] The second extension 742 is formed as a pointed portion partially surrounding the left-right end of the grille 720. The second extension 742 extends at a predetermined angle to the first extension 741. In one embodiment, the second extension 742 may extend at an obtuse angle to the first extension 741.

[0486] In another embodiment, the second extension 742 may extend parallel to the pointed portion formed at the left-right end of the grille 720.

[0487] The arc flow channel 750 induces an electric arc so that the generated arc flows toward the grid 720. The arc guide 740 prevents the generated arc from crossing the grid 720 and traveling toward one side wall of the cover 100. Thus, damage to the cover 100 due to the generated arc can be prevented.

[0488] The arc flow channel 750 is located on the side of the support plate 710 facing the fixed contact 311 and the movable contact 321. In the illustrated embodiment, the arc flow channel 750 is located on the underside of the support plate 710.

[0489] The arc flow channel 750 is located on the opposite side of the support plate 710 from the fixed contact 311. Specifically, the arc flow channel 750 is located on the rear side of the lower side of the support plate 710, opposite to the fixed contact 311 located on the front side of the support plate 710.

[0490] The arc flow channel 750 is joined to the support plate 710. The joining is formed by inserting a protrusion formed at the left and right ends of the arc flow channel 750 into a through hole formed in the support plate 710.

[0491] The arc flow channel 750 can be formed of a conductive material. This is to apply an attractive force to the flowing arc, thereby effectively inducing the arc. In one embodiment, the arc flow channel 750 can be formed of copper, or iron, or an alloy containing them.

[0492] The arc flow channel 750 extends a predetermined length toward the grille 720. In one embodiment, the arc flow channel 750 may be configured to cover the grille 720 furthest from the fixed contact 311 from the rear side, i.e., the grille 720 located on the rearmost side in the illustrated embodiment.

[0493] Therefore, the electric arc does not extend beyond the grille 720 located on the rearmost side, thus preventing damage to the cover 100. Furthermore, the generated electric arc can be effectively induced towards the grille 720.

[0494] The magnet housing 760 houses the arc-extinguishing magnet section 770, which forms the main magnetic field (MMF) and the sub-magnetic field (SMF) in the arc-extinguishing section 700.

[0495] In addition, the magnet housing 760 is combined with the support plate 710 or the grid 720 so that the arc-extinguishing magnet part 770 can be stably combined with the arc-extinguishing part 700.

[0496] The magnet housing 760 extends in one direction, namely the left-right direction in the illustrated embodiment. The length of the extended magnet housing 760 can be determined based on the length of the grid 720 extending in the width direction, i.e., the left-right direction.

[0497] In one embodiment, the magnet housing 760 may extend such that one end and the other end in the direction of extension contact each of the opposing support plates 710. That is, the magnet housing 760 extends between the opposing support plates 710.

[0498] The magnet housing 760 can be formed of an insulating material. This is to prevent magnetic interference to the main magnetic field (MMF) and sub-magnetic field (SMF) generated by the arc-extinguishing magnet section 770.

[0499] The magnet housing 760 can be formed of a heat-resistant material. This is to prevent the magnet housing 760 from being damaged by high-temperature, high-pressure electric arcs.

[0500] In one embodiment, the magnet housing 760 may be formed of synthetic resin or reinforced plastic.

[0501] In the illustrated embodiment, the magnet housing 760 includes a first receiving portion 761, a second receiving portion 762, a third receiving portion 763, a grid connection portion 764, and an arc inflow portion 765.

[0502] The first receiving section 761 receives the first arc-extinguishing magnet 771 of the arc-extinguishing magnet section 770.

[0503] The first receiving portion 761 forms one side of the magnet housing 760, namely the lower side in the illustrated embodiment. In other words, the first receiving portion 761 forms the side of the magnet housing 760 facing the fixed contact 311.

[0504] The first receiving portion 761 protrudes downwards in a direction away from the grille 720, i.e., downwards in the illustrated embodiment. The protruding length of the first receiving portion 761 can be determined based on the position of the lower end of the support plate 710. That is, the lower end of the first receiving portion 761 can be located at a position further separated from the fixed contact 311 compared to the lower end of the support plate 710.

[0505] The first receiving portion 761 can be located in the direction in which the magnet housing 760 extends, i.e., the central portion in the left-right direction in the illustrated embodiment. In other words, the first receiving portion 761 can be located between the second receiving portion 762 and the third receiving portion 763.

[0506] The first receiving portion 761 may be located on the lower side of the grille 720. Specifically, the first receiving portion 761 is located on the side of the grille 720 facing the fixed contact 311, i.e., the lower side in the illustrated embodiment.

[0507] A grille joining portion 764 is formed on the side of the first receiving portion 761 facing the grille 720, i.e., the upper side in the illustrated embodiment. In addition, arc inflow portions 765 are formed on both sides of the first receiving portion 761, i.e., the right and left sides in the illustrated embodiment.

[0508] The first receiving portion 761 includes a first receiving groove 761a, a first fastening hole 761b, a first fastening member 761c, and a cover portion 761d.

[0509] The first receiving groove 761a is a space for accommodating the first arc-extinguishing magnet 771 of the arc-extinguishing magnet section 770. The first receiving groove 761a is recessed in the front side of the first receiving section 761 on the side opposite to the arc flow channel 750, i.e., in the illustrated embodiment.

[0510] The first receiving groove 761a can be formed at any position that can accommodate the first arc-extinguishing magnet 771. For example, the first receiving groove 761a can be formed on the rear side or lower side of the first receiving portion 761, that is, at any position that can be recessed to form a space.

[0511] An opening is formed on one side of the first receiving groove 761a, i.e., the front side in the illustrated embodiment. The first arc-extinguishing magnet 771 can pass through the opening and be received in the first receiving groove 761a.

[0512] As described above, the first receiving groove 761a can also be formed at another location of the first receiving portion 761. In this case, the opening is also formed on the outside of the first receiving groove 761a, thereby serving as a passage for the first arc-extinguishing magnet 771 to be received in the first receiving groove 761a. In the illustrated embodiment, the first receiving groove 761a is formed with a rectangular cross-section. The shape of the first receiving groove 761a can be varied according to the shape of the first arc-extinguishing magnet 771.

[0513] After the first arc-extinguishing magnet 771 is accommodated in the first receiving groove 761a, the first receiving groove 761a can be covered by the cover portion 761d. This prevents the first arc-extinguishing magnet 771 accommodated in the first receiving groove 761a from shaking or randomly detaching.

[0514] The first fastening hole 761b is a space for inserting a first fastening member 761c to secure the cover portion 761d to the first receiving portion 761. The first fastening hole 761b is formed recessed in the first receiving portion 761. In one embodiment, the first fastening hole 761b may be formed through the first receiving portion 761.

[0515] The first fastening hole 761b is located adjacent to the first receiving groove 761a. In the illustrated embodiment, two first fastening holes 761b are formed, and each first fastening hole 761b is located on the right and left sides of the first receiving groove 761a, respectively.

[0516] The number and position of the first fastening hole 761b can be changed according to the number and position of the fastening holes formed in the cover portion 761d.

[0517] The first fastening member 761c fastens the first receiving portion 761 and the cover portion 761d.

[0518] The first fastening member 761c is inserted through and connected to the cover portion 761d. Additionally, the first fastening member 761c is inserted into or through and connected to the first receiving portion 761. Thus, the first receiving portion 761 and the cover portion 761d can be stably connected.

[0519] The first fastening member 761c can be configured in any shape capable of fastening two or more members. In one embodiment, the first fastening member 761c can be configured as a screw member or a rivet member, etc.

[0520] The first fastening member 761c can be provided in multiples. In the illustrated embodiment, there are two first fastening members 761c. The number of first fastening members 761c can be determined according to the number of first fastening holes 761b in the first receiving portion 761 and the number of through holes formed in the cover portion 761d.

[0521] The cover portion 761d is engaged with the first receiving portion 761. After the first arc-extinguishing magnet 771 is received in the first receiving groove 761a, the cover portion 761d can cover the first receiving groove 761a. This prevents the first arc-extinguishing magnet 771 from randomly shaking or falling out.

[0522] The cover portion 761d may be formed in a shape corresponding to the first receiving portion 761. In one embodiment, the cover portion 761d may be formed in the same shape as the cross-section of the first receiving portion 761.

[0523] In the illustrated embodiment, the cross-section of the first receiving portion 761 and the cross-section of the cover portion 761d are trapezoidal in shape, with the upper and lower edges forming the bottom and top surfaces, but their shapes can be changed.

[0524] A through hole is formed in the cover portion 761d. A first fastening member 761c is inserted through the through hole. Thus, the cover portion 761d and the first receiving portion 761 can be stably joined.

[0525] A plurality of through holes can be formed. The plurality of through holes can be spaced apart from each other. In the illustrated embodiment, two through holes are formed and are spaced apart along the left and right directions of the cover portion 761d.

[0526] The number and position of the through holes can be changed according to the number and position of the first fastening holes 761b of the first receiving part 761.

[0527] The second receiving portion 762 is located on one side of the first receiving portion 761, on the left side in the illustrated embodiment. The first receiving portion 761 and the second receiving portion 762 are continuous.

[0528] The second receiving section 762 receives the second arc-extinguishing magnet 772 of the arc-extinguishing magnet section 770.

[0529] The second receiving portion 762 forms on the other side of the magnet housing 760, namely the left side in the illustrated embodiment. In other words, the second receiving portion 762 is located adjacent to either of the opposing support plates 710, namely the support plate 710 on the left side in the illustrated embodiment.

[0530] The second receiving portion 762 is located on one side of the first receiving portion 761, i.e., on the left side in the illustrated embodiment. The second receiving portion 762 extends in a direction away from the first receiving portion 761.

[0531] In other words, the second receiving portion 762 extends toward the left edge of the support plate 710 or the grille 720. The end of the second receiving portion 762 may contact the support plate 710.

[0532] The second receiving portion 762 is configured to face the third receiving portion 763 across the first receiving portion 761. In one embodiment, the second receiving portion 762 and the third receiving portion 763 may be formed symmetrically to each other.

[0533] The second receiving portion 762 may be located on one side of the grille 720. Specifically, the second receiving portion 762 is located on one side of the grille 720 facing the support plate 710 on the left side, i.e., the left side in the illustrated embodiment.

[0534] A grid joint 764 is formed between the second receiving portion 762 and the third receiving portion 763. Additionally, an arc inflow portion 765 is formed between the second receiving portion 762 and the third receiving portion 763.

[0535] The second receiving portion 762 includes a second receiving groove 762a, a second fastening hole 762b, and a second fastening member 762c.

[0536] The second receiving groove 762a is a space for accommodating the second arc-extinguishing magnet 772 of the arc-extinguishing magnet section 770. The second receiving groove 762a is formed in a recess on the end face of the second receiving section 762, i.e., the left side face in the illustrated embodiment.

[0537] In other words, the second receiving groove 762a is recessed on the side of the second receiving portion 762 facing the support plate 710, i.e., the left side in the illustrated embodiment.

[0538] An opening is formed on one side of the second receiving groove 762a, i.e., the left side in the illustrated embodiment. The second arc-extinguishing magnet 772 can be received in the second receiving groove 762a through the opening.

[0539] In the illustrated embodiment, the second receiving groove 762a is formed with a rectangular cross-section. The shape of the second receiving groove 762a can be changed according to the shape of the second arc-extinguishing magnet 772.

[0540] After the second arc-extinguishing magnet 772 is housed in the second receiving groove 762a, the second receiving groove 762a can be covered by the support plate 710. This prevents the second arc-extinguishing magnet 772 housed in the second receiving groove 762a from shaking or randomly detaching.

[0541] The second fastening hole 762b is a space for inserting the second fastening member 762c to fix the support plate 710 to the second receiving portion 762. The second fastening hole 762b is formed recessed in the second receiving portion 762. In one embodiment, the second fastening hole 762b may be formed through the second receiving portion 762.

[0542] The second fastening hole 762b is located adjacent to the second receiving groove 762a. In the illustrated embodiment, two second fastening holes 762b are formed, with each second fastening hole 762b located on the upper and lower sides of the second receiving groove 762a, respectively.

[0543] The number and position of the second fastening hole 762b can be changed according to the number and position of the fastening holes formed in the support plate 710.

[0544] The second fastening member 762c fastens the second receiving part 762 and the support plate 710.

[0545] The second fastening member 762c is inserted through and connected to the support plate 710. Furthermore, the second fastening member 762c is inserted into and connected through the second receiving portion 762. Thus, the second receiving portion 762 and the support plate 710 can be stably connected.

[0546] The second fastening member 762c can be configured in any shape capable of fastening two or more members. In one embodiment, the second fastening member 762c can be configured as a screw member or a rivet member, etc.

[0547] The second fastening member 762c can be provided in multiples. In the illustrated embodiment, there are two second fastening members 762c. The number of second fastening members 762c can be determined according to the number of second fastening holes 762b in the second receiving portion 762 and the number of through holes formed in the support plate 710.

[0548] The third receiving section 763 receives the third arc-extinguishing magnet 773 of the arc-extinguishing magnet section 770.

[0549] The third receiving portion 763 is formed on the other side of the magnet housing 760, i.e., the right side in the illustrated embodiment. In other words, the third receiving portion 763 is located adjacent to the other of the opposing support plates 710, i.e., the support plate 710 on the right side in the illustrated embodiment.

[0550] The third receiving portion 763 is located on the other side of the first receiving portion 761, i.e., on the right side in the illustrated embodiment. The third receiving portion 763 extends in a direction away from the first receiving portion 761.

[0551] In other words, the third receiving portion 763 extends toward the right edge of the support plate 710 or the grille 720. The end of the third receiving portion 763 may contact the support plate 710.

[0552] The third receiving portion 763 is configured to face the second receiving portion 762 across the first receiving portion 761. In one embodiment, the third receiving portion 763 and the second receiving portion 762 may be formed symmetrically to each other.

[0553] The third receiving portion 763 may be located on one side of the grille 720. Specifically, the third receiving portion 763 is located on one side of the grille 720 facing the support plate 710 on the right side, i.e., the right side in the illustrated embodiment.

[0554] A grid joint 764 is formed between the third receiving portion 763 and the second receiving portion 762. In addition, an arc inflow portion 765 is formed between the third receiving portion 763 and the second receiving portion 762.

[0555] The third receiving portion 763 includes a third receiving groove 763a, a third fastening hole 763b, and a third fastening member 763c.

[0556] The third receiving groove 763a is a space for accommodating the third arc-extinguishing magnet 773 of the arc-extinguishing magnet section 770. The third receiving groove 763a is formed in a recess on the end face of the third receiving section 763, i.e., the right side face in the illustrated embodiment.

[0557] In other words, the third receiving groove 763a is recessed on the side of the third receiving portion 763 facing the support plate 710, i.e., the right side in the illustrated embodiment.

[0558] An opening is formed on one side of the third receiving groove 763a, i.e., the right side in the illustrated embodiment. The third arc-extinguishing magnet 773 can pass through the opening and be received in the third receiving groove 763a.

[0559] In the illustrated embodiment, the third receiving groove 763a is formed with a rectangular cross-section. The shape of the third receiving groove 763a can be changed according to the shape of the third arc-extinguishing magnet 773.

[0560] After the third arc-extinguishing magnet 773 is housed in the third receiving groove 763a, the third receiving groove 763a can be covered by the support plate 710. This prevents the third arc-extinguishing magnet 773 housed in the third receiving groove 763a from shaking or randomly detaching.

[0561] The third fastening hole 763b is a space for inserting the third fastening member 763c for fixing the support plate 710 to the third receiving portion 763. The third fastening hole 763b is formed in a recess in the third receiving portion 763. In one embodiment, the third fastening hole 763b may be formed through the third receiving portion 763.

[0562] The third fastening hole 763b is located adjacent to the third receiving groove 763a. In the illustrated embodiment, two third fastening holes 763b are formed, with each third fastening hole 763b located on the upper and lower sides of the third receiving groove 763a, respectively.

[0563] The number and position of the third fastening hole 763b can be changed according to the number and position of the fastening holes formed in the support plate 710.

[0564] The third fastening member 763c fastens the third receiving part 763 and the support plate 710.

[0565] The third fastening member 763c is inserted through and connected to the support plate 710. Additionally, the third fastening member 763c is inserted into or inserted through the third receiving portion 763. Thus, the third receiving portion 763 and the support plate 710 can be stably connected.

[0566] The third fastening member 763c can be configured in any shape capable of fastening two or more members. In one embodiment, the third fastening member 763c can be configured as a screw member or a rivet member, etc.

[0567] The third fastening member 763c can be provided in multiples. In the illustrated embodiment, there are two third fastening members 763c. The number of third fastening members 763c can be determined based on the number of third fastening holes 763b in the third receiving portion 763 and the number of through holes formed in the support plate 710.

[0568] The first receiving part 761, the second receiving part 762, and the third receiving part 763 can each be located at a predetermined height with the vertical direction as the reference.

[0569] Specifically, the first receiving portion 761 may be located at a relatively lower position compared to the second receiving portion 762 and the third receiving portion 763.

[0570] That is, the distance between the first receiving portion 761 and the grille cover 730 can be made longer than the distance between the second receiving portion 762 and the grille cover 730 or the distance between the third receiving portion 763 and the grille cover 730. In one embodiment, the distance can be the shortest distance, i.e., the vertical distance.

[0571] In other words, the distance between the first receiving portion 761 and the fixed contact 311 can be shorter than the distance between the second receiving portion 762 and the fixed contact 311 or the distance between the third receiving portion 763 and the fixed contact 311. In one embodiment, the distance can be the shortest distance, i.e., the vertical distance.

[0572] In addition, the second receiving part 762 and the third receiving part 763 can be located at the same height in the vertical direction.

[0573] That is, the distance between the second receiving portion 762 and the grille cover 730 can be configured to be the same as the distance between the third receiving portion 763 and the grille cover 730. In one embodiment, the distance can be the shortest distance, i.e., the vertical distance.

[0574] In other words, the distance between the second receiving portion 762 and the fixed contact 311 can be configured to be the same as the distance between the third receiving portion 763 and the fixed contact 311. In one embodiment, the distance can be the shortest distance, i.e., the vertical distance.

[0575] Therefore, the electric arc generated and extended at the fixed contact 311 can be induced to the arc extinguishing part 700 by the magnetic field formed by the first arc extinguishing magnet 771 contained in the first receiving part 761.

[0576] In addition, the induced arc is induced by the magnetic field formed by the second arc-extinguishing magnet 772 and the third arc-extinguishing magnet 773 respectively housed in the second housing portion 762 and the third housing portion 763, so that it can pass through the grid 720 and be extinguished.

[0577] The grille joint 764 is the part where the magnet housing 760 and the grille 720 are joined. Specifically, the grille 720 is inserted into and joined to the grille joint 764.

[0578] The grid joint 764 is recessed on the other side of the magnet housing 760. Specifically, the grid joint 764 is recessed on the side of the magnet housing 760 opposite to the side where the first receiving portion 761 is formed, i.e., the upper side in the illustrated embodiment.

[0579] The grille joint 764 is recessed to a predetermined length. Preferably, the grille joint 764 is recessed to a sufficient depth to partially accommodate the lower side of the grille 720.

[0580] The grille joint 764 extends between the second receiving portion 762 and the third receiving portion 763. In the illustrated embodiment, the grille joint 764 extends in a left-right direction. The direction in which the grille joint 764 extends is to be understood as the same as the direction in which the grille 720 extends between the support plates 710.

[0581] The grille joint 764 extends to a predetermined length. In the illustrated embodiment, the left end of the grille joint 764 is located adjacent to the left end of the arc inflow portion 765 formed on the left side in the left-right direction. Furthermore, the right end of the grille joint 764 is located adjacent to the right end of the arc inflow portion 765 formed on the right side in the left-right direction.

[0582] The extension length of the grille joint 764 is preferably formed to partially accommodate the side of the grille 720 facing the fixed contact 311, i.e., the length of the lower side in the illustrated embodiment.

[0583] The interior of the grille joint 764 can form a step. In the illustrated embodiment, the ends of the grille joint 764 extending in the left-right direction are recessed to form a shorter length than the rest. In one embodiment, the ends of the grille joint 764 can be formed through the magnet housing 760 in the vertical direction.

[0584] Therefore, the left and right ends of the grille 720 inserted into the grille joint 764 can penetrate and be joined to the grille joint 764.

[0585] At this time, the grille 720 attached to the grille joint 764 may have a different shape than another grille 720 not attached to the grille joint 764.

[0586] As an example, the length of the grille 720 that is attached to the grille joint 764, that is, the length in the vertical direction, can be made shorter than the length of the other grille 720 that is not attached to the grille joint 764.

[0587] In addition, the width of the end of the grille 720 that is attached to the grille joint 764, that is, the length in the left and right direction, can be made shorter than the width of the end of the other grille 720 that is not attached to the grille joint 764.

[0588] At this time, the width of the portion of the grille 720 that is attached to the grille joint 764 and the support plate 710 is formed to be the same as the width of the portion of the other grille 720 that is not attached to the grille joint 764 and the support plate 710.

[0589] That is, if the grid 720 that is combined with the magnet housing 760 has the same shape as another grid 720 that is not combined with the magnet housing 760, the structure of the arc extinguishing part 700 should be changed too much in order to install the magnet housing 760.

[0590] Therefore, the arc-extinguishing part 700 in this embodiment can minimize structural changes by changing the shape of a portion of the grid 720 that is combined with the magnet housing 760.

[0591] The step formed inside the grille joint 764 can be determined based on the shape of the lower end of the grille 720 inserted into the grille joint 764.

[0592] The grille joint 764 can be provided in multiples. The multiple grille joints 764 can be formed with spaced apart from each other.

[0593] In the illustrated embodiment, the grille joint 764 includes a first grille joint 764a located in the direction toward the fixed contact 311, i.e., the front side, and a second grille joint 764b located in the direction toward the arc flow channel 750, i.e., the rear side, forming two joints.

[0594] Each grid joint 764a, 764b is formed apart from each other along the front-rear direction of the upper side of the magnet housing 760 facing the grid 720, i.e., in the illustrated embodiment.

[0595] At each grille joint 764, a different grille 720 can be inserted into its lower side. In the illustrated embodiment, at the first grille joint 764a located on the front side, a grille 720 configured as the fifth one from the front side is inserted and joined. Additionally, at the second grille joint 764b located on the rear side, a grille 720 configured to be adjacent to the rear side of the grille 720 is inserted and joined.

[0596] The grille 720 inserted into the second grille joint 764b is understood to be configured as the sixth grille 720 from the front side.

[0597] The arc inflow section 765 forms a passage for the arc flowing through the arc extinguishing section 700 to flow toward the grid 720.

[0598] Specifically, the arc path (AP) is formed by the main magnetic field (MMF) and sub-magnetic field (SMF) generated by the arc-extinguishing magnet section 770 housed in the magnet housing 760. As a result, the arc path (AP) flows toward the grid 720.

[0599] At this time, the ends of the grille 720 in the width direction, i.e., the right and left directions in the illustrated embodiment, are formed into pointed shapes. Therefore, the flowing electric arc can travel towards the two ends of the grille 720.

[0600] However, as described above, the magnet housing 760 is inserted into a portion of the plurality of grids 720. Therefore, the flowing electric arc can travel toward both ends of the grids 720 into which the magnet housing 760 is inserted.

[0601] Therefore, the arc inflow section 765 serves as a passage for the incoming arc to flow toward another grid 720 adjacent to the grid 720 inserted into the magnet housing 760.

[0602] That is, in the illustrated embodiment, the arc inflow portion 765 can induce the inflowing arc to flow toward another grid 720 located adjacent to the front or rear side of the grid 720 inserted into the magnet housing 760.

[0603] The arc inflow portion 765 is recessed on the side of the magnet housing 760 facing the fixed contact 311, i.e., the lower side in the illustrated embodiment. In one embodiment, the arc inflow portion 765 may be recessed on the side passing through the lower end of the first receiving portion 761.

[0604] The arc inflow portion 765 can extend to a predetermined length. In the illustrated embodiment, the arc inflow portion 765 includes: a first portion extending obliquely upward; and a second portion communicating with the first portion and extending vertically upward.

[0605] The length of the arc inflow section 765 can be configured to allow the flowing arc to flow toward the adjacent grid 720.

[0606] The arc inflow portion 765 can be formed in a plurality of forms. The plurality of arc inflow portions 765 can be disposed on both sides of the first receiving portion 761. In one embodiment, the plurality of arc inflow portions 765 can be disposed around both sides of the first receiving portion 7651.

[0607] In the illustrated embodiment, the arc inflow portion 765 is formed around the first receiving portion 761 in two directions extending from the magnet housing 760, namely the right side and the left side.

[0608] Thus, the electric arc flowing into the grid 720 to which the magnet housing 760 is attached in the plurality of grids 720 can flow through the electric arc inflow portion 765 into the adjacent grid 720.

[0609] Thus, the generated electric arc is effectively extinguished and can pass through the arc-extinguishing section 700.

[0610] The arc-extinguishing magnet section 770 forms a magnetic field for forming an arc path (AP). The arc flowing within the magnetic field formed by the arc-extinguishing magnet section 770 is subjected to an electromagnetic force defined by the Lorentz force. Thus, an arc path (AP) is formed, allowing the generated arc to travel in a predetermined direction.

[0611] The arc-extinguishing magnet part 770 is housed within the magnet housing 760. That is, the arc-extinguishing magnet part 770 is not exposed to the outside. As a result, the arc-extinguishing magnet part 770 will not be damaged by the generated electric arc or dust contained in the electric arc.

[0612] The arc-extinguishing magnet section 770 can be configured in any shape capable of generating a magnetic field. In one embodiment, the arc-extinguishing magnet section 770 may be provided with a permanent magnet or an electromagnet.

[0613] The arc-extinguishing magnet section 770 can be configured in multiples. The multiple arc-extinguishing magnet sections 770 can form a magnetic field between each other, namely the main magnetic field (MMF). In addition, the multiple arc-extinguishing magnet sections 770 can form a magnetic field formed by each arc-extinguishing magnet section 770, namely the sub-magnetic field (SMF).

[0614] In the illustrated embodiment, the arc-extinguishing magnet section 770 includes a first arc-extinguishing magnet 771, a second arc-extinguishing magnet 772, and a third arc-extinguishing magnet 773, and is configured to have three. The number of arc-extinguishing magnet sections 770 can be varied.

[0615] The first arc-extinguishing magnet 771 forms a magnetic field for forming the path (AP) of the electric arc.

[0616] The first arc-extinguishing magnet 771 can generate a sub-magnetic field (SMF) on its own. In addition, the first arc-extinguishing magnet 771, together with the second arc-extinguishing magnet 772 and the third arc-extinguishing magnet 773, can generate a main magnetic field (MMF).

[0617] The first arc-extinguishing magnet 771 can be formed into a predetermined shape. In the illustrated embodiment, the first arc-extinguishing magnet 771 is formed into a rectangular cross-section with a length in the left-right direction that is longer than its length in the up-down direction.

[0618] The shape of the first arc-extinguishing magnet 771 can be any shape that is accommodated in the first receiving groove 761a and can be sealed by the cover portion 761d. That is, the shape of the first arc-extinguishing magnet 771 can be determined according to the shape of the first receiving groove 761a.

[0619] Therefore, the first arc-extinguishing magnet 771 will not be exposed to the outside. As a result, the first arc-extinguishing magnet 771 will not be damaged by the generated electric arc.

[0620] The first arc-extinguishing magnet 771 includes a first surface 771a and a second surface 771b.

[0621] The first surface 771a forms one side of the first arc-extinguishing magnet 771 facing the grid 720. In other words, the first surface 771a forms the side of the first arc-extinguishing magnet 771 opposite to the fixed contact 311. In the illustrated embodiment, the first surface 771a can be defined as the upper side of the first arc-extinguishing magnet 771.

[0622] The second surface 771b forms the other side of the first arc-extinguishing magnet 771 facing the fixed contact 331. In other words, the second surface 771b forms the other side of the first arc-extinguishing magnet 771 opposite to the grid 720. In the illustrated embodiment, the second surface 771b can be defined as the lower side of the first arc-extinguishing magnet 771.

[0623] The first surface 771a and the second surface 771b are configured to face each other. That is, the first surface 771a and the second surface 771b are one side and the other side of the first arc-extinguishing magnet 771 facing each other.

[0624] The first surface 771a can be magnetized to either the N or S pole. Similarly, the second surface 771b can be magnetized to the other polarity, either the N or S pole. That is, the first surface 771a and the second surface 771b are magnetized to opposite polarities. This creates a subfield magnetic field (SMF) between the first surface 771a and the second surface 771b.

[0625] The second arc-extinguishing magnet 772 forms a magnetic field for forming the path (AP) of the electric arc.

[0626] The second arc-extinguishing magnet 772 can generate its own sub-magnetic field (SMF). In addition, the second arc-extinguishing magnet 772, together with the first arc-extinguishing magnet 771 and the third arc-extinguishing magnet 773, can generate the main magnetic field (MMF).

[0627] The second arc-extinguishing magnet 772 can be formed into a predetermined shape. In the illustrated embodiment, the second arc-extinguishing magnet 772 is formed into a rectangular cross-section with a length in the front-to-back direction longer than its length in the vertical direction.

[0628] The shape of the second arc-extinguishing magnet 772 can be any shape that is accommodated in the second receiving groove 762a and can be sealed by the support plate 710. That is, the shape of the second arc-extinguishing magnet 772 can be determined according to the shape of the second receiving groove 762a.

[0629] Therefore, the second arc-extinguishing magnet 772 will not be exposed to the outside. As a result, the second arc-extinguishing magnet 772 will not be damaged by the generated electric arc.

[0630] The second arc-extinguishing magnet 772 includes a first surface 772a and a second surface 772b.

[0631] The first surface 772a forms one side of the second arc-extinguishing magnet 772 facing the support plate 710. In other words, the first surface 772a forms one side of the second arc-extinguishing magnet 772 opposite to the grid 720. In the illustrated embodiment, the first surface 772a can be defined as the left side or outer side of the second arc-extinguishing magnet 772.

[0632] The second surface 772b forms the other side of the second arc-extinguishing magnet 772 facing the grid 720. In other words, the second surface 772b forms the other side of the second arc-extinguishing magnet 772 opposite to the support plate 710. In the illustrated embodiment, the second surface 772b can be defined as the right side or inner side of the second arc-extinguishing magnet 772.

[0633] The first surface 772a and the second surface 772b are configured to face each other. In other words, the first surface 772a and the second surface 772b are one side and the other side of the second arc-extinguishing magnet 772 facing each other.

[0634] The first surface 772a can be magnetized to either the N or S pole. Similarly, the second surface 772b can be magnetized to the other polarity, either the N or S pole. That is, the first surface 772a and the second surface 772b are magnetized to opposite polarities. This creates a subfield magnetic field (SMF) between the first surface 772a and the second surface 772b.

[0635] The third arc-extinguishing magnet 773 forms a magnetic field for forming the path (AP) of the electric arc.

[0636] The third arc-extinguishing magnet 773 can generate its own sub-magnetic field (SMF). In addition, the third arc-extinguishing magnet 773, together with the first arc-extinguishing magnet 771 and the second arc-extinguishing magnet 772, can form the main magnetic field (MMF).

[0637] The third arc-extinguishing magnet 773 can be configured in any shape capable of forming a magnetic field. In one embodiment, the third arc-extinguishing magnet 773 can be configured as a permanent magnet or an electromagnet.

[0638] The third arc-extinguishing magnet 773 can be formed into a predetermined shape. In the illustrated embodiment, the third arc-extinguishing magnet 773 is formed into a rectangular cross-section with a length in the left-right direction longer than its length in the up-down direction.

[0639] The shape of the third arc-extinguishing magnet 773 can be any shape that is accommodated in the third receiving groove 763a and can be sealed by the support plate 710. That is, the shape of the third arc-extinguishing magnet 773 can be determined according to the shape of the third receiving groove 763a.

[0640] The third arc-extinguishing magnet 773 includes a first surface 773a and a second surface 773b.

[0641] The first surface 773a forms one side of the third arc-extinguishing magnet 773 facing the support plate 710. In other words, the first surface 773a forms one side of the third arc-extinguishing magnet 773 opposite to the grid 720. In the illustrated embodiment, the first surface 773a can be defined as the right side or outer side of the third arc-extinguishing magnet 773.

[0642] The second surface 773b forms the other side of the third arc-extinguishing magnet 773 facing the grid 720. In other words, the second surface 773b forms the other side of the third arc-extinguishing magnet 773 opposite to the support plate 710. In the illustrated embodiment, the second surface 773b can be defined as the left side or inner side of the third arc-extinguishing magnet 773.

[0643] The first surface 773a and the second surface 773b are configured to face each other. In other words, the first surface 773a and the second surface 773b are one side and the other side of the third arc-extinguishing magnet 773 facing each other.

[0644] In addition, the second surface 773b is configured to face the second surface 772b of the second arc-extinguishing magnet 772.

[0645] The first surface 773a can be magnetized to either the N or S pole polarity. Furthermore, the second surface 773b can be magnetized to either the N or S pole polarity. That is, the first surface 773a and the second surface 773b are magnetized to opposite polarities. Thus, a subfield magnetic field (SMF) can be formed between the first surface 773a and the second surface 773b.

[0646] The process of forming the main magnetic field (MMF) and sub-magnetic field (SMF) through each arc-extinguishing magnet 771, 772, and 773 will be described in detail later.

[0647] 7. Description of the path (AP) of the electric arc formed by the air circuit breaker 10 in various embodiments of the present invention

[0648] As described above, the air circuit breaker 10 of this embodiment includes a fixed contact 311 and a movable contact 321. If the fixed contact 311 and the movable contact 321 are separated, an electric arc is generated by the previously energized current.

[0649] The air circuit breaker 10 of this invention includes various components for forming an arc path (AP) for the generated arc to flow toward the arc extinguishing sections 600 and 700.

[0650] The following is for reference Figures 31 to 44 The process of forming an arc path (AP) in the air circuit breaker 10 of the present invention is described in detail.

[0651] The various embodiments described below can individually form the path (AP) of an electric arc, or two or more embodiments can be combined with each other to form the path (AP) of an electric arc.

[0652] In the following explanation, the part indicated by "⊙" refers to the direction in which the current flows out of the paper. The part indicated by "ⓧ" refers to the direction in which the current flows towards the paper.

[0653] The part represented by the symbol is to be understood as the part where the fixed contact 311 and the movable contact 321 are in contact, so that the air circuit breaker 10 is energized with an external power source or load.

[0654] (1) Explanation of the process of forming an arc path (AP) through the cover magnet portion 400 of the present invention

[0655] Reference Figures 31 to 32 The process of forming an electric arc path (AP) through the cover magnet portion 400 in an embodiment of the present invention will be described in detail.

[0656] Reference Figure 31 The illustration shows the front of an air circuit breaker 10 including the cover magnet portion 400 according to an embodiment of the present invention. Additionally, refer to... Figure 32 The illustration shows the top surface of an air circuit breaker 10 including the cover magnet portion 400 according to an embodiment of the present invention.

[0657] For ease of understanding, the illustration of the upper cover 110 has been omitted.

[0658] In the illustrated embodiment, the first cover magnet 410, the second cover magnet 420, the third cover magnet 430, and the fourth cover magnet 440 of the cover magnet portion 400 are arranged such that each fixed contact holder 310 is located between them.

[0659] At this time, the upper side surfaces of each cover magnet 410, 420, 430, and 440, namely the first surfaces 411, 421, 431, and 441, are formed to present an S pole. In addition, the lower side surfaces of each cover magnet 410, 420, 430, and 440, namely the second surfaces 412, 422, 432, and 442, are formed to present an N pole.

[0660] Each cover magnet 410, 420, 430, and 440 forms a sub-magnetic field (SMF) based on its own magnetic field.

[0661] Although not illustrated, the cover magnets 410, 420, 430, and 440 located in adjacent positions can form a main magnetic field (MMF) between each other.

[0662] exist Figure 31 In (a), the direction of the current flowing through each blocking part 300 is the direction from the paper, that is, the direction in which the current flowing in the air circuit breaker 10 is transmitted to the external power source or load through the fixed contact frame 310.

[0663] In addition, the sub-magnetic field (SMF) formed by each cover magnet 410, 420, 430, 440 is from each second surface 412, 422, 432, 442 toward each first surface 411, 421, 431, 441, that is, from the bottom to the top in the illustrated embodiment.

[0664] If Ampere's left-hand rule is applied at the contact points of each fixed contact 311 and each movable contact 321, the path of the arc (AP) can be anticipated. That is, the electromagnetic force formed by the submagnetic field (SMF) and the energized current is formed towards one side edge of the arc extinguishing parts 600 and 700, i.e., the upper left side in the illustrated embodiment.

[0665] Therefore, in Figure 31In the illustrated embodiment of (a), the formed electric arc travels toward one side (i.e., the left side) edge of the grids 620, 720. Thus, the generated electric arc can flow rapidly and be extinguished.

[0666] exist Figure 31 In (b), the direction of the current flowing through each blocking part 300 is the direction of entering the paper, that is, the direction of the current flowing from the external power source or load through the fixed contact frame 310 to the air circuit breaker 10.

[0667] In addition, the sub-magnetic field (SMF) formed by each cover magnet 410, 420, 430, 440 is from each second surface 412, 422, 432, 442 toward each first surface 411, 421, 431, 441, that is, from the bottom to the top in the illustrated embodiment.

[0668] If Ampere's left-hand rule is applied at the contact points of each fixed contact 311 and each movable contact 321, the path of the arc (AP) can be anticipated. That is, the electromagnetic force formed by the submagnetic field (SMF) and the energized current is formed towards the edge of the arc extinguishing section 600, 700, i.e., the upper right side in the illustrated embodiment.

[0669] Therefore, in Figure 31 In the illustrated embodiment of (b), the formed electric arc travels toward the opposite (i.e., right) edge of the grids 620, 720. Thus, the generated arc can flow rapidly and be extinguished.

[0670] Reference Figure 32 The illustration shows the view from above. Figure 31 The top view of the example shown.

[0671] exist Figure 32 In (a), the direction of the current flowing through each blocking section 300 is the same as the direction in which the current flowing through the air circuit breaker 10 is transmitted to the external power source or load via the fixed contact frame 310. The direction of the current is to be understood as... Figure 31 The embodiment illustrated in (a) is the same.

[0672] As described above, the direction of the sub-magnetic field (SMF) formed by each cover magnet 410, 420, 430, 440 is from each second surface 412, 422, 432, 442 toward each first surface 411, 421, 431, 441, that is, toward the arc extinguishing part 600, 700.

[0673] If Ampere's left-hand rule is applied at the contact points of each fixed contact 311 and each movable contact 321, the path of the arc (AP) can be anticipated. That is, the electromagnetic force formed by the submagnetic field (SMF) and the energized current is formed towards one side edge of the arc extinguishing parts 600 and 700, i.e., the upper left side in the illustrated embodiment.

[0674] Therefore, in Figure 32 In the illustrated embodiment (a), the formed electric arc travels toward one side (i.e., the left side) edge of the grids 620, 720. Thus, the generated arc can flow rapidly and be extinguished.

[0675] exist Figure 32 In (b), the direction of the current flowing through each blocking section 300 is the same as the direction in which the current flowing from the external power source or load is transmitted to the air circuit breaker 10 via the fixed contact frame 310. The direction of the current is to be understood as... Figure 31 The embodiment illustrated in (b) is the same.

[0676] As described above, the direction of the sub-magnetic field (SMF) formed by each cover magnet 410, 420, 430, 440 is from each second surface 412, 422, 432, 442 toward each first surface 411, 421, 431, 441, that is, toward the arc extinguishing part 600, 700.

[0677] If Ampere's left-hand rule is applied at the contact points of the fixed contacts 311 and the movable contacts 321, the path of the arc (AP) can be anticipated. That is, the electromagnetic force formed by the submagnetic field (SMF) and the energized current is formed towards one side edge of the arc extinguishing parts 600 and 700, i.e., the upper right side in the illustrated embodiment.

[0678] Therefore, in Figure 32 In the embodiment illustrated in (b), the formed electric arc travels toward the opposite (i.e., right) edge of the grids 620, 720. Thus, the generated arc can flow rapidly and be extinguished.

[0679] In this embodiment, the first surfaces 411, 421, 431, and 441 of each cover magnet 410, 420, 430, and 440 can be magnetized to have the same polarity (i.e., S pole). Similarly, the second surfaces 412, 422, 432, and 442 of each cover magnet 410, 420, 430, and 440 can be magnetized to have the same polarity (i.e., N pole).

[0680] In this embodiment, even if the direction of the current energized at each contact 311, 321 changes, the path (AP) of the arc is formed toward the ends of the grilles 620, 720 and the grille covers 630, 730.

[0681] Therefore, regardless of the direction of the current, the generated arc can move rapidly along the path of the arc (AP) and be extinguished.

[0682] (2) Explanation of the process of forming an arc path (AP) through the arc extinguishing part 600 of an embodiment of the present invention

[0683] Reference Figures 33 to 36 The process of forming an arc path (AP) through the arc extinguishing part 600 according to an embodiment of the present invention will be described in detail.

[0684] In the illustrated embodiment, for ease of understanding, any one of a plurality of arc-extinguishing sections 600 is shown. Other arc-extinguishing sections 600 not shown are also understood to represent the path (AP) for forming an arc according to the following description.

[0685] Reference Figure 33 The illustration shows the front view of an arc-extinguishing part 600 according to an embodiment of the present invention. Additionally, refer to... Figure 34 The figure shows a side cross-section of an arc-extinguishing part 600 according to an embodiment of the present invention.

[0686] As described above, the arc-extinguishing part 600 of this embodiment includes an arc-extinguishing magnet 634 housed in the cover body 631.

[0687] The first surface 634a of the arc-extinguishing magnet 634, that is, the surface opposite to the grid 620, is magnetized as the S pole. Consequently, the second surface 634b of the arc-extinguishing magnet 634, that is, the surface facing the grid 620, is magnetized as the N pole.

[0688] The arc-extinguishing magnet 634 generates a sub-magnetic field (SMF) of its own. The SMF generated by the arc-extinguishing magnet 634 is directed toward the grid 620, that is, from top to bottom in the illustrated embodiment.

[0689] exist Figure 33 In (a), the direction of the current flowing through each contact 311, 321 is the direction from the paper, that is, the direction in which the current flowing in the air circuit breaker 10 is transmitted to the external power source or load through the fixed contact frame 310.

[0690] Therefore, if Ampere's left-hand rule is applied at the contact points 311, 321, the path of the arc (AP) can be anticipated. That is, the electromagnetic force formed by the submagnetic field (SMF) and the current flowing through each contact 311, 321 is formed towards one side edge of the grid 620, i.e., the upper right side in the illustrated embodiment.

[0691] exist Figure 33In (b), the direction of the current flowing through each contact 311, 321 is the direction of entering the paper, that is, the direction of the current flowing from the external power source or load through each contact 311, 321 to the air circuit breaker 10.

[0692] Therefore, if Ampere's left-hand rule is applied at the contact points 311, 321, the path of the arc (AP) can be anticipated. That is, the electromagnetic force formed by the submagnetic field (SMF) and the current flowing through each contact 311, 321 forms towards the other edge of the grid 620, i.e., towards the upper left side in the illustrated embodiment.

[0693] As described above, the left and right ends of the grid 620 can be formed into a pointed shape. Thus, the electric arc can flow along the path (AP) of the formed arc and enter the ends of the grid 620.

[0694] Furthermore, the path (AP) of the electric arc is formed toward the grid cover 630 located on the upper side of the grid 620. The grid cover 630 is provided with a through hole 632a of the upper frame 632 communicating with the outside, a mesh portion 633, and a through hole 636a of the baffle plate 636.

[0695] Therefore, the generated electric arc can move rapidly along the path (AP) of the formed arc and be extinguished, and discharged to the outside.

[0696] exist Figure 34 In (a), the direction of the current flowing through each contact 311, 321 is away from the arc-extinguishing part 600, that is, the direction in which the current flowing in the air circuit breaker 10 is transmitted to the external power source or load through the fixed contact frame 310 (refer to...). Figure 34 (The solid arrow in (a)).

[0697] Therefore, if Ampere's left-hand rule is applied at the contact points 311 and 321, the path of the arc (AP) can be predicted. That is, the electromagnetic force formed by the submagnetic field (SMF) and the current flowing through each contact 311 and 321 is formed in the direction of entering the paper, i.e., towards the left side of the grid 620.

[0698] Although not illustrated, in this embodiment, the path (AP) of the electric arc will be understood as, as Figure 33 The embodiment shown in (a) is formed with a grille cover 630 facing the upper side of the grille 620.

[0699] exist Figure 34In (b), the direction of the current flowing through each contact 311, 321 is towards the arc-extinguishing section 600, that is, the direction in which the current flowing from the external power source or load is transmitted to the air circuit breaker 10 through each contact 311, 321 (refer to...). Figure 34 (The solid arrow in (b)).

[0700] Therefore, if Ampere's left-hand rule is applied at the contact points 311 and 321, the path of the arc (AP) can be predicted. That is, the electromagnetic force formed by the submagnetic field (SMF) and the current flowing through each contact 311 and 321 is formed in the direction out of the paper, i.e., towards the right side of the grid 620.

[0701] Although not illustrated, in this embodiment, the path (AP) of the electric arc is understood as follows: Figure 33 The embodiment shown in (b) is formed as a grille cover 630 facing the upper side of the grille 620.

[0702] As described above, the left and right ends of the grid 620 can be formed into a pointed shape. Thus, the electric arc can flow along the path (AP) of the formed arc and enter the ends of the grid 620.

[0703] Therefore, the generated electric arc can move rapidly along the path (AP) of the formed arc and be extinguished, and discharged to the outside.

[0704] Reference Figure 35 The illustration shows the front view of an arc-extinguishing part 600 according to an embodiment of the present invention. Additionally, refer to... Figure 36 The figure shows a side cross-section of an arc-extinguishing part 600 according to an embodiment of the present invention.

[0705] As described above, the arc-extinguishing part 600 of this embodiment includes an arc-extinguishing magnet 634 housed in the cover body 631.

[0706] The first surface 634a of the arc-extinguishing magnet 634, that is, the surface opposite to the grid 620, is magnetized as the N pole. Consequently, the second surface 634b of the arc-extinguishing magnet 634, that is, the surface facing the grid 620, is magnetized as the S pole.

[0707] The arc-extinguishing magnet 634 generates a sub-magnetic field (SMF) of its own. The direction of the sub-magnetic field (SMF) generated by the arc-extinguishing magnet 634 is away from the grid 620, that is, from the bottom to the top in the illustrated embodiment.

[0708] exist Figure 35 In (a), the current energized at each contact 311, 321 is in the direction of coming out of the paper, that is, the direction in which the current flowing in the air circuit breaker 10 is transmitted to the external power source or load through the fixed contact frame 310.

[0709] Therefore, if Ampere's left-hand rule is applied at the contact points 311, 321, the path of the arc (AP) can be anticipated. That is, the electromagnetic force formed by the submagnetic field (SMF) and the current flowing through each contact 311, 321 is formed towards one side edge of the grille 620, i.e., the upper left side in the illustrated embodiment.

[0710] exist Figure 35 In (b), the direction of the current flowing through each contact 311, 321 is the direction of entering the paper, that is, the direction of the current flowing from the external power source or load through each contact 311, 321 to the air circuit breaker 10.

[0711] Therefore, if Ampere's left-hand rule is applied at the contact points 311, 321, the path of the arc (AP) can be anticipated. That is, the electromagnetic force formed by the submagnetic field (SMF) and the current flowing through each contact 311, 321 is formed in the direction toward the other edge of the grille 620, i.e., the upper right side in the illustrated embodiment.

[0712] exist Figure 36 In (a), the direction of the current energized at each contact 311, 321 is away from the arc-extinguishing section 600, that is, the direction in which the current flowing in the air circuit breaker 10 is transmitted to the external power source or load through the fixed contact frame 310 (refer to...). Figure 36 (The solid arrow in (a)).

[0713] Therefore, if Ampere's left-hand rule is applied at the contact points 311 and 321, the path of the arc (AP) can be predicted. That is, the electromagnetic force formed by the submagnetic field (SMF) and the current flowing through each contact 311 and 321 is formed in the direction out of the paper, i.e., towards the right side of the grid 620.

[0714] Although not illustrated, in this embodiment, the path (AP) of the electric arc will be understood as, as Figure 35 The embodiment shown in (a) is formed with a grille cover 630 facing the upper side of the grille 620.

[0715] exist Figure 36 In (b), the direction of the current flowing through each contact 311, 321 is towards the arc-extinguishing section 600, that is, the direction in which the current flowing from the external power source or load is transmitted to the air circuit breaker 10 through each contact 311, 321 (refer to...). Figure 36 (The solid arrow in (b)).

[0716] Therefore, if Ampere's left-hand rule is applied at the contact points 311 and 321, the path of the arc (AP) can be predicted. That is, the electromagnetic force formed by the submagnetic field (SMF) and the current flowing through each contact 311 and 321 is formed in the direction of entering the paper, i.e., towards the left side of the grid 620.

[0717] Although not illustrated, in this embodiment, the path (AP) of the electric arc will be understood as, as Figure 33 The embodiment shown in (b) is formed as a grille cover 630 facing the upper side of the grille 620.

[0718] As described above, the left and right ends of the grid 620 can be formed into a pointed shape. Thus, the electric arc can flow along the path (AP) of the formed arc and enter the ends of the grid 620.

[0719] Furthermore, the path (AP) of the electric arc is formed toward the grid cover 630 located on the upper side of the grid 620. The grid cover 630 is provided with a through hole 632a of the upper frame 632 communicating with the outside, a mesh portion 633, and a through hole 636a of the baffle plate 636.

[0720] Therefore, the generated electric arc can move rapidly along the path (AP) of the formed arc and be extinguished, and discharged to the outside.

[0721] In this embodiment, even if the polarity of the arc-extinguishing magnet 634 changes, the path (AP) of the formed arc is oriented towards the width direction of the grille 620, i.e., the left-right direction in the illustrated embodiment. Furthermore, the path (AP) of the formed arc is oriented towards the grille cover 630 located opposite to each contact 311, 321.

[0722] Furthermore, even if the direction of the current energized at each contact 311, 321 changes, the path (AP) of the arc is formed toward the end of the grille 620 and the grille cover 630.

[0723] Therefore, even if the polarity of the arc-extinguishing magnet 634 and the direction of the current change, the generated arc can move rapidly along the arc path (AP) and be extinguished.

[0724] (3) A path for forming an electric arc through the CT magnet section 500 of one embodiment of the present invention and the arc extinguishing section 600 of another embodiment. Explanation of the AP process

[0725] Reference Figures 37 to 40 The process of forming an arc path (AP) by the CT magnet part 500 of one embodiment of the present invention and the arc extinguishing part 600 of another embodiment is described in detail.

[0726] As described above, the CT magnet section 500 of this embodiment includes a CT magnet 530.

[0727] The CT magnet 530 is housed in the space 520 of the housing 510 and forms a sub-magnetic field (SMF). In addition, the CT magnet 530 can form a main magnetic field (MMF) together with the arc-extinguishing magnet 634 of the arc-extinguishing section 600.

[0728] Furthermore, as described above, the arc-extinguishing part 600 of one embodiment of the present invention includes an arc-extinguishing magnet 634.

[0729] The arc-extinguishing magnet 634 is housed inside the grid cover 630 and forms a sub-magnetic field (SMF). In addition, the arc-extinguishing magnet 634 can form a main magnetic field (MMF) together with the CT magnet 530 of the CT magnet section 500.

[0730] At this time, the faces of the CT magnet 530 and the arc-extinguishing magnet 634 that are opposite to each other, namely the first face 531 of the CT magnet 530 and the second face 634b of the arc-extinguishing magnet 634, can be magnetized to different polarities.

[0731] Reference Figure 37 The illustration shows the front of an air circuit breaker 10 including a CT magnet section 500 according to an embodiment of the present invention and an arc-extinguishing section 600 according to another embodiment. Additionally, refer to... Figure 38 The illustration shows the right side of an air circuit breaker 10 including a CT magnet section 500 according to an embodiment of the present invention and an arc extinguishing section 600 according to another embodiment.

[0732] The first surface 531 of the CT magnet 530, facing each contact 311, 321 or the arc-extinguishing part 600, is magnetized as the S pole. Consequently, the second surface 532 of the CT magnet 530, opposite to each contact 311, 321 or the arc-extinguishing part 600, is magnetized as the N pole. The CT magnet 530 forms a self-generated sub-magnetic field (SMF).

[0733] Furthermore, the first surface 634a of the arc-extinguishing magnet 634, that is, the surface opposite to each contact 311, 321 or the CT magnet section 500, is magnetized as the S pole. Consequently, the second surface 634b of the arc-extinguishing magnet 634, that is, the surface facing each contact 311, 321 or the CT magnet section 500, is magnetized as the N pole. The arc-extinguishing magnet 634 generates a magnetic field of its own, namely a sub-magnetic field (SMF).

[0734] Furthermore, a main magnetic field (MMF) is formed between the CT magnet 530 and the arc-extinguishing magnet 634. Specifically, the main magnetic field (MMF) is formed in the direction from the second surface 634b of the arc-extinguishing magnet 634 toward the first surface 531 of the CT magnet 530, i.e., from the top to the bottom in the illustrated embodiment.

[0735] exist Figure 37In (a), the direction of the current energized at each contact 311, 321 is the direction from the paper, that is, the direction in which the current flowing in the air circuit breaker 10 is transmitted to the external power source or load through the fixed contact frame 310.

[0736] Therefore, if Ampere's left-hand rule is applied at the contact points 311 and 321, the path of the arc (AP) can be predicted.

[0737] That is, the main magnetic field (MMF) formed between the CT magnet 530 and the arc-extinguishing magnet 634, and the electromagnetic force formed by the current energized at each contact 311, 321, are formed toward one side edge of the grille 620, i.e., the upper right side in the illustrated embodiment.

[0738] exist Figure 37 In (b), the direction of the current energized at each contact 311 and 321 is the direction of entering the paper, that is, the direction of the current flowing from the external power source or load through each contact 311 and 321 to the air circuit breaker 10.

[0739] Therefore, if Ampere's left-hand rule is applied at the contact points 311 and 321, the path of the arc (AP) can be predicted.

[0740] That is, the main magnetic field (MMF) formed between the CT magnet 530 and the arc-extinguishing magnet 634, and the electromagnetic force formed by the current energized at each contact 311, 321, are formed toward one side edge of the grille 620, i.e., the upper left side in the illustrated embodiment.

[0741] exist Figure 38 In (a), the direction of the current energized at each contact 311, 321 is away from the arc-extinguishing section 600, that is, the direction in which the current flowing in the air circuit breaker 10 is transferred to the external power source or load through each contact 311, 321 (refer to...). Figure 38 (The solid arrow in (a)).

[0742] Therefore, if Ampere's left-hand rule is applied at the contact points 311 and 321, the path of the arc (AP) can be predicted.

[0743] That is, the main magnetic field (MMF) formed between the CT magnet 530 and the arc-extinguishing magnet 634, and the electromagnetic force formed by the current energized at each contact 311, 321, are formed in the direction from the paper surface, that is, towards the right side of the grid 620.

[0744] Although not illustrated, in this embodiment, the path (AP) of the electric arc will be understood as, as Figure 37The embodiment shown in (a) is formed with a grille cover 630 facing the upper side of the grille 620.

[0745] Figure 38 In (b), the direction of the current energized at each contact 311 and 321 is towards the arc-extinguishing section 600, that is, the direction in which the current flowing from the external power source or load is transmitted to the air circuit breaker 10 through each contact 311 and 321 (refer to...). Figure 38 (The solid arrow in (b)).

[0746] Therefore, if Ampere's left-hand rule is applied at the contact points 311 and 321, the path of the arc (AP) can be predicted.

[0747] That is, the main magnetic field (MMF) formed between the CT magnet 530 and the arc-extinguishing magnet 634, and the electromagnetic force formed by the current energized at each contact 311, 321, are formed in the direction of entering the paper, that is, in the direction of the left side of the grid 620.

[0748] Although not illustrated, in this embodiment, the path (AP) of the electric arc will be understood as, as Figure 37 The embodiment shown in (b) is formed as a grille cover 630 facing the upper side of the grille 620.

[0749] As described above, the left and right ends of the grid 620 can be formed into a pointed shape. Thus, the electric arc can flow along the path (AP) of the formed arc and enter the ends of the grid 620.

[0750] Furthermore, the path (AP) of the electric arc is formed toward the grid cover 630 located on the upper side of the grid 620. The grid cover 630 is provided with a through hole 632a of the upper frame 632 communicating with the outside, a mesh portion 633, and a through hole 636a of the baffle plate 636.

[0751] Therefore, the generated electric arc can move rapidly along the path (AP) of the formed arc and be extinguished, and discharged to the outside.

[0752] Reference Figure 39 The illustration shows the front of an air circuit breaker 10 including a CT magnet section 500 according to an embodiment of the present invention and an arc-extinguishing section 600 according to another embodiment. Additionally, refer to... Figure 40 The illustration shows the side of an air circuit breaker 10 including a CT magnet section 500 according to an embodiment of the present invention and an arc extinguishing section 600 according to another embodiment.

[0753] The first surface 531 of the CT magnet 530, facing each contact 311, 321 or the arc-extinguishing part 600, is magnetized as the N pole. Consequently, the second surface 532 of the CT magnet 530, opposite to each contact 311, 321 or the arc-extinguishing part 600, is magnetized as the S pole. The CT magnet 530 forms a self-generated sub-magnetic field (SMF).

[0754] Furthermore, the first surface 634a of the arc-extinguishing magnet 634, that is, the surface opposite to each contact 311, 321 or the CT magnet section 500, is magnetized as the N pole. Consequently, the second surface 634b of the arc-extinguishing magnet 634, that is, the surface facing each contact 311, 321 or the CT magnet section 500, is magnetized as the S pole. The arc-extinguishing magnet 634 generates its own magnetic field, namely the sub-magnetic field (SMF).

[0755] Furthermore, a main magnetic field (MMF) is formed between the CT magnet 530 and the arc-extinguishing magnet 634. Specifically, the main magnetic field (MMF) is formed in the direction from the first surface 531 of the CT magnet 530 toward the second surface 634b of the arc-extinguishing magnet 634, i.e., from the bottom to the top in the illustrated embodiment.

[0756] exist Figure 39 In (a), the direction of the current energized at each contact 311, 321 is the direction from the paper, that is, the direction in which the current flowing in the air circuit breaker 10 is transmitted to the external power source or load through the fixed contact frame 310.

[0757] Therefore, if Ampere's left-hand rule is applied at the contact points 311 and 321, the path of the arc (AP) can be predicted.

[0758] That is, the main magnetic field (MMF) formed between the CT magnet 530 and the arc-extinguishing magnet 634, and the electromagnetic force formed by the current energized at each contact 311, 321, are formed toward one side edge of the grille 620, i.e., the upper left side in the illustrated embodiment.

[0759] exist Figure 39 In (b), the direction of the current energized at each contact 311 and 321 is the direction of entering the paper, that is, the direction of the current flowing into the external power source or load through each contact 311 and 321 to the air circuit breaker 10.

[0760] Therefore, if Ampere's left-hand rule is applied at the contact points 311 and 321, the path of the arc (AP) can be predicted.

[0761] That is, the main magnetic field (MMF) formed between the CT magnet 530 and the arc-extinguishing magnet 634 and the electromagnetic force formed by the current energized at each contact 311, 321 are directed toward one side edge of the grille 620, i.e., the upper right side in the illustrated embodiment.

[0762] exist Figure 40 In (a), the direction of the current energized at each contact 311, 321 is away from the arc-extinguishing section 600, that is, the direction in which the current flowing in the air circuit breaker 10 is transferred to the external power source or load through each contact 311, 321 (refer to...). Figure 40 (The solid arrow in (a)).

[0763] Therefore, if Ampere's left-hand rule is applied at the contact points 311 and 321, the path of the arc (AP) can be predicted.

[0764] That is, the main magnetic field (MMF) formed between the CT magnet 530 and the arc-extinguishing magnet 634, and the electromagnetic force formed by the current energized at each contact 311, 321, are formed in the direction of entering the paper, that is, in the direction of the left side of the grid 620.

[0765] Although not illustrated, in this embodiment, the path (AP) of the electric arc will be understood as, as Figure 39 The embodiment shown in (a) is formed with a grille cover 630 facing the upper side of the grille 620.

[0766] exist Figure 40 In (b), the direction of the current energized at each contact 311 and 321 is towards the arc-extinguishing section 600, that is, the direction in which the current flowing from the external power source or load is transmitted to the air circuit breaker 10 through each contact 311 and 321 (refer to...). Figure 40 (The solid arrow in (b)).

[0767] Therefore, if Ampere's left-hand rule is applied at the contact points 311 and 321, the path of the arc (AP) can be predicted.

[0768] That is, the main magnetic field (MMF) formed between the CT magnet 530 and the arc-extinguishing magnet 634, and the electromagnetic force formed by the current energized at each contact 311, 321, are formed in the direction from the paper surface, that is, towards the right side of the grid 620.

[0769] Although not illustrated, in this embodiment, the path (AP) of the electric arc will be understood as, as Figure 39 The embodiment shown in (b) is formed as a grille cover 630 facing the upper side of the grille 620.

[0770] As described above, the left and right ends of the grid 620 can be formed into a pointed shape. Thus, the electric arc can flow along the path (AP) of the formed arc and enter the ends of the grid 620.

[0771] Furthermore, the path (AP) of the electric arc is formed toward the grid cover 630 located on the upper side of the grid 620. The grid cover 630 is provided with a through hole 632a of the upper frame 632 communicating with the outside, a mesh portion 633, and a through hole 636a of the baffle plate 636.

[0772] Therefore, the generated electric arc can move rapidly along the path (AP) of the formed arc and be extinguished, and discharged to the outside.

[0773] In this embodiment, even if the polarity of the CT magnet 530 and the arc-extinguishing magnet 634 changes, the path (AP) of the formed arc is formed in the width direction toward the grille 620, i.e., the left-right direction in the illustrated embodiment. Furthermore, the path (AP) of the formed arc is formed toward the grille cover 630, which is positioned opposite to each contact 311, 321.

[0774] Furthermore, even if the direction of the current energized at each contact 311, 321 changes, the path (AP) of the arc is formed toward the end of the grille 620 and the grille cover 630.

[0775] Therefore, even if the polarity of the arc-extinguishing magnet 634 and the direction of the current change, the generated arc can move rapidly along the arc path (AP) and be extinguished.

[0776] In addition, the CT magnet 530 and the arc-extinguishing magnet 634 each form a sub-magnetic field (SMF). Each sub-magnetic field (SMF) is formed in the same direction as the main magnetic field (MMF) formed between the CT magnet 530 and the arc-extinguishing magnet 634.

[0777] Therefore, the strength of the magnetic field along the arc-forming path (AP) can be increased. As a result, the strength of the electromagnetic force is also increased, allowing the generated arc to move rapidly along the arc-forming path (AP) toward the arc-extinguishing section 600 and be extinguished.

[0778] (4) Explanation of the process of forming an arc path (AP) through the arc-extinguishing part 700 of another embodiment of the present invention

[0779] Reference Figures 41 to 44 The process of forming an arc path (AP) through the arc extinguishing part 700 in an embodiment of the present invention will be described in detail.

[0780] As described above, the arc-extinguishing part 700 of this embodiment includes an arc-extinguishing magnet part 770. The arc-extinguishing magnet part 770 includes: a first arc-extinguishing magnet 771 disposed in the first receiving part 761; a second arc-extinguishing magnet 772 disposed in the second receiving part 762; and a third arc-extinguishing magnet 773 disposed in the third receiving part 763.

[0781] Each arc-extinguishing magnet 771, 772, and 773 forms a sub-magnetic field (SMF). In addition, a main magnetic field (MMF) can be formed between each arc-extinguishing magnet 771, 772, and 773.

[0782] At this time, the faces of the second arc-extinguishing magnet 772 and the third arc-extinguishing magnet 773 that are opposite to each other, namely the second face 772b of the second arc-extinguishing magnet 772 and the second face 773b of the third arc-extinguishing magnet 773, can be magnetized to the same polarity.

[0783] In addition, the side of the first arc-extinguishing magnet 771 facing the grid 720, that is, the first side 771a of the first arc-extinguishing magnet 771, can be magnetized to have the same polarity as the second side 772b of the second arc-extinguishing magnet 772 and the second side 773b of the third arc-extinguishing magnet 773.

[0784] Reference Figure 41 The illustration shows the front side of the arc-extinguishing part 700 according to an embodiment of the present invention. Additionally, refer to... Figure 42 The figure shows the bottom surface of the arc-extinguishing part 700 according to an embodiment of the present invention.

[0785] The first surface 771a of the first arc-extinguishing magnet 771, that is, the surface of the first arc-extinguishing magnet 771 facing the grid 720, is magnetized as the S pole. Consequently, the second surface 771b of the first arc-extinguishing magnet 771, that is, the surface of the first arc-extinguishing magnet 771 opposite to the grid 720, is magnetized as the N pole. The magnetic field formed between the first surface 771a and the second surface 771b by the first arc-extinguishing magnet 771 is called the sub-magnetic field (SMF).

[0786] The first surface 772a of the second arc-extinguishing magnet 772, that is, the side of the second arc-extinguishing magnet 772 opposite to the first arc-extinguishing magnet 771, is magnetized as the N pole. Consequently, the second surface 772b of the second arc-extinguishing magnet 772, that is, the side of the second arc-extinguishing magnet 772 facing the first arc-extinguishing magnet 771, is magnetized as the S pole. The magnetic field formed between the first surface 772a and the second surface 772b by the second arc-extinguishing magnet 772 is called the sub-magnetic field (SMF).

[0787] The first surface 773a of the third arc-extinguishing magnet 773, that is, the side of the third arc-extinguishing magnet 773 opposite to the first arc-extinguishing magnet 771, is magnetized as the N pole. Consequently, the second surface 773b of the third arc-extinguishing magnet 773, that is, the side of the third arc-extinguishing magnet 773 facing the first arc-extinguishing magnet 771, is magnetized as the S pole. The magnetic field formed by the third arc-extinguishing magnet 773 between the first surface 773a and the second surface 773b is called the sub-magnetic field (SMF).

[0788] In addition, a main magnetic field (MMF) is formed between the first arc-extinguishing magnet 771 and the second arc-extinguishing magnet 772. Specifically, the main magnetic field (MMF) is formed in the direction from the second surface 771b of the first arc-extinguishing magnet 771 toward the second surface 772b of the second arc-extinguishing magnet 772, that is, in the illustrated embodiment, in the direction from the first arc-extinguishing magnet 771 toward the left.

[0789] A main magnetic field (MMF) is also formed between the first arc-extinguishing magnet 771 and the third arc-extinguishing magnet 773. Specifically, the main magnetic field (MMF) is formed in the direction from the second surface 771b of the first arc-extinguishing magnet 771 toward the second surface 773b of the third arc-extinguishing magnet 773, that is, in the illustrated embodiment, in the direction from the first arc-extinguishing magnet 771 toward the right.

[0790] exist Figure 41 In (a), the direction of the current energized at each contact 311, 321 is the direction from the paper, that is, the direction in which the current flowing in the air circuit breaker 10 is transmitted to the external power source or load through the fixed contact frame 310.

[0791] Therefore, if Ampere's left-hand rule is applied at the contact points 311 and 321, the path of the arc (AP) can be predicted.

[0792] That is, the main magnetic field (MMF), the sub-magnetic field (SMF), and the electromagnetic force formed by the current flowing through each contact 311, 321 are formed toward one side edge of the grille 720, i.e., the upper right side in the illustrated embodiment. As a result, the path (AP) of the electric arc is also formed toward the upper right side.

[0793] exist Figure 41 In (b), the direction of the current energized at each contact 311 and 321 is the direction of entering the paper, that is, the direction of the current flowing from the external power source or load through each contact 311 and 321 to the air circuit breaker 10.

[0794] Therefore, if Ampere's left-hand rule is applied at the contact points 311 and 321, the path of the arc (AP) can be predicted.

[0795] That is, the main magnetic field (MMF), the sub-magnetic field (SMF), and the electromagnetic force formed by the current flowing through each contact 311, 321 are formed toward the other edge of the grille 720, i.e., the upper left side in the illustrated embodiment. As a result, the path (AP) of the electric arc is also formed toward the upper left side.

[0796] exist Figure 42 In (a), the direction of the current energized at each contact 311, 321 is toward the arc extinguishing section 700, that is, the direction in which the current flowing from the external power source or load is transmitted to the air circuit breaker 10 through each contact 311, 321.

[0797] Therefore, if Ampere's left-hand rule is applied at the contact points 311 and 321, the path of the arc (AP) can be predicted.

[0798] That is, the main magnetic field (MMF), the sub-magnetic field (SMF), and the electromagnetic force formed by the current flowing through each contact 311, 321 are formed in the direction of entering the paper surface, that is, in the direction of the grid 720.

[0799] Although not illustrated, in this embodiment, the path (AP) of the electric arc will be understood as, as Figure 41 The embodiment shown in (a) is formed facing the right side of the grille 720.

[0800] exist Figure 42 In (b), the direction of the current energized at each contact 311, 321 is away from the arc extinguishing part 700, that is, the direction in which the current flowing in the air circuit breaker 10 is transmitted to the external power source or load through each contact 311, 321.

[0801] Therefore, if Ampere's left-hand rule is applied at the contact points 311 and 321, the path of the arc (AP) can be predicted.

[0802] That is, the main magnetic field (MMF), the sub-magnetic field (SMF), and the electromagnetic force formed by the current flowing through each contact 311, 321 are formed in the direction of entering the paper surface, that is, in the direction of the grid 720.

[0803] Although not illustrated, in this embodiment, the path (AP) of the electric arc will be understood as, as Figure 41 (b) The embodiment shown in the figure is formed facing the left side of the grille 720.

[0804] As described above, the left and right ends of the grid 720 can be formed into a pointed shape. Thus, the electric arc can flow along the path (AP) of the formed electric arc and enter the ends of the grid 720.

[0805] Furthermore, the path (AP) of the electric arc is formed toward the grid cover 730 located on the upper side of the grid 720. The grid cover 730 is provided with a through-hole 732a of the upper frame 732 communicating with the outside and a through-hole 734a of the mesh portion 733.

[0806] Therefore, the generated electric arc can move rapidly along the path (AP) of the formed arc and be extinguished, and discharged to the outside.

[0807] Reference Figure 43 The illustration shows the front side of the arc-extinguishing part 700 according to an embodiment of the present invention. Additionally, refer to... Figure 44 The figure shows the bottom surface of the arc-extinguishing part 700 according to an embodiment of the present invention.

[0808] The first surface 771a of the first arc-extinguishing magnet 771, that is, the surface of the first arc-extinguishing magnet 771 facing the grid 720, is magnetized as the N pole. Consequently, the second surface 771b of the first arc-extinguishing magnet 771, that is, the surface of the first arc-extinguishing magnet 771 opposite to the grid 720, is magnetized as the S pole. The magnetic field formed between the first surface 771a and the second surface 771b by the first arc-extinguishing magnet 771 is called the sub-magnetic field (SMF).

[0809] The first surface 772a of the second arc-extinguishing magnet 772, that is, the side of the second arc-extinguishing magnet 772 opposite to the first arc-extinguishing magnet 771, is magnetized as the S pole. Consequently, the second surface 772b of the second arc-extinguishing magnet 772, that is, the side of the second arc-extinguishing magnet 772 facing the first arc-extinguishing magnet 771, is magnetized as the N pole. The magnetic field formed between the first surface 772a and the second surface 772b by the second arc-extinguishing magnet 772 is called the sub-magnetic field (SMF).

[0810] The first surface 773a of the third arc-extinguishing magnet 773, that is, the side of the third arc-extinguishing magnet 773 opposite to the first arc-extinguishing magnet 771, is magnetized as the S pole. Consequently, the second surface 773b of the third arc-extinguishing magnet 773, that is, the side of the third arc-extinguishing magnet 773 facing the first arc-extinguishing magnet 771, is magnetized as the N pole. The magnetic field formed between the first surface 773a and the second surface 773b by the third arc-extinguishing magnet 773 is called the sub-magnetic field (SMF).

[0811] Furthermore, a main magnetic field (MMF) is formed between the first arc-extinguishing magnet 771 and the second arc-extinguishing magnet 772. Specifically, the main magnetic field (MMF) is formed in the direction from the second surface 772b of the second arc-extinguishing magnet 772 toward the second surface 771b of the first arc-extinguishing magnet 771, that is, in the illustrated embodiment, in the direction from the second arc-extinguishing magnet 772 toward the right.

[0812] A main magnetic field (MMF) is also formed between the first arc-extinguishing magnet 771 and the third arc-extinguishing magnet 773. Specifically, the main magnetic field (MMF) is formed in the direction from the second surface 773b of the third arc-extinguishing magnet 773 toward the second surface 771b of the first arc-extinguishing magnet 771, that is, in the embodiment shown, in the direction from the third arc-extinguishing magnet 773 toward the left.

[0813] exist Figure 43 In (a), the direction of the current energized at each contact 311, 321 is the direction from the paper, that is, the direction in which the current flowing in the air circuit breaker 10 is transmitted to the external power source or load through the fixed contact frame 310.

[0814] Therefore, if Ampere's left-hand rule is applied at the contact points 311 and 321, the path of the arc (AP) can be predicted.

[0815] That is, the main magnetic field (MMF), the sub-magnetic field (SMF), and the electromagnetic force formed by the current flowing through each contact 311, 321 are formed toward one side edge of the grille 720, i.e., the upper left side in the illustrated embodiment. As a result, the path (AP) of the electric arc is also formed toward the upper left side.

[0816] exist Figure 43 In (b), the direction of the current energized at each contact 311 and 321 is the direction of entering the paper, that is, the direction of the current flowing from the external power source or load through each contact 311 and 321 to the air circuit breaker 10.

[0817] Therefore, if Ampere's left-hand rule is applied at the contact points 311 and 321, the path of the arc (AP) can be predicted.

[0818] That is, the main magnetic field (MMF), the sub-magnetic field (SMF), and the electromagnetic force formed by the current flowing through each contact 311, 321 are formed toward the other edge of the grille 720, i.e., the upper right side in the illustrated embodiment. As a result, the path (AP) of the electric arc is also formed toward the upper right side.

[0819] exist Figure 44 In (a), the direction of the current energized at each contact 311, 321 is toward the arc extinguishing section 700, that is, the direction in which the current flowing from the external power source or load is transmitted to the air circuit breaker 10 through each contact 311, 321.

[0820] Therefore, if Ampere's left-hand rule is applied at the contact points 311 and 321, the path of the arc (AP) can be predicted.

[0821] That is, the main magnetic field (MMF), the sub-magnetic field (SMF), and the electromagnetic force formed by the current flowing through each contact 311, 321 are formed in the direction of entering the paper surface, that is, in the direction of the grid 720.

[0822] Although not illustrated, in this embodiment, the path (AP) of the electric arc will be understood as, as Figure 43 The embodiment shown in (a) is formed facing the left side of the grille 720.

[0823] exist Figure 44 In (b), the direction of the current energized at each contact 311, 321 is away from the arc extinguishing part 700, that is, the direction in which the current flowing in the air circuit breaker 10 is transmitted to the external power source or load through each contact 311, 321.

[0824] Therefore, if Ampere's left-hand rule is applied at the contact points 311 and 321, the path of the arc (AP) can be predicted.

[0825] That is, the main magnetic field (MMF), the sub-magnetic field (SMF), and the electromagnetic force formed by the current flowing through each contact 311, 321 are formed in the direction of entering the paper surface, that is, in the direction of the grid 720.

[0826] Although not illustrated, in this embodiment, the path (AP) of the electric arc will be understood as, as Figure 43 The embodiment shown in (b) is formed facing the right side of the grille 720.

[0827] As described above, the left and right ends of the grid 720 can be formed into a pointed shape. Thus, the electric arc can flow along the path (AP) of the formed electric arc and enter the ends of the grid 720.

[0828] Furthermore, the path (AP) of the electric arc is formed toward the grid cover 730 located on the upper side of the grid 720. The grid cover 730 is provided with a through-hole 732a of the upper frame 732 communicating with the outside and a through-hole 734a of the mesh portion 733.

[0829] Therefore, the generated electric arc can move rapidly along the path (AP) of the formed arc and be extinguished, and discharged to the outside.

[0830] In this embodiment, even if the polarity of each arc-extinguishing magnet 771, 772, 773 changes, the path (AP) of the formed arc is formed in the width direction of the grille 720, i.e., the left-right direction in the illustrated embodiment. Furthermore, the path (AP) of the formed arc is formed towards the grille cover 730, which is located in the opposite position to each contact 311, 321.

[0831] Furthermore, even if the direction of the current energized at each contact 311, 321 changes, the path (AP) of the arc is formed toward the end of the grille 720 and the grille cover 730.

[0832] Therefore, even if the polarity of each arc-extinguishing magnet 771, 772, 773 and the direction of the current change, the generated arc can move rapidly along the arc path (AP) and be extinguished.

[0833] In addition, each arc-extinguishing magnet 771, 772, and 773 forms its own sub-magnetic field (SMF). Each sub-magnetic field (SMF) is formed in the same direction as the main magnetic field (MMF) formed between each arc-extinguishing magnet 771, 772, and 773.

[0834] Therefore, the strength of the magnetic field along the path (AP) of the electric arc can be increased. As a result, the strength of the electromagnetic force is also increased, so the generated electric arc can move rapidly along the path (AP) toward the arc extinguishing part 700 and be extinguished.

[0835] The present invention has been described above with reference to preferred embodiments, but it is understood that those skilled in the art can make various modifications and changes to the present invention without departing from the spirit and scope of the invention as set forth in the following claims.

[0836] Commercial utilization of potential

[0837] The present invention relates to an arc-extinguishing section and an air circuit breaker including the arc-extinguishing section, and can provide an arc-extinguishing section capable of effectively extinguishing an electric arc generated by blocking current and an air circuit breaker including the arc-extinguishing section, and therefore has the potential for industrial application.

Claims

1. An arc-extinguishing part, in, include: Support plates, in plurality of which are arranged opposite to each other; A grille is located between the support plates and is respectively coupled to a plurality of the support plates; A grille cover, which is combined with and covers the grille; and An arc-quenching magnet is housed inside the grille cover. The arc-quenching magnet generates a magnetic field in a direction from the grid cover toward the grid or from the grid toward the grid cover. The grille cover includes: The main body of the cover has internal storage space; A baffle plate is located in the receiving space of the cover body. The arc-extinguishing magnet is housed in the receiving space of the cover body and is placed on the blocking plate.

2. The arc-extinguishing part according to claim 1, wherein, The grille cover includes: The mesh portion is accommodated within the accommodating space of the cover body. The arc-extinguishing magnet is located between the grid section and the blocking plate.

3. The arc-extinguishing part according to claim 2, wherein, The grille cover includes an upper frame that is combined with the cover body and covers the cover body.

4. The arc-extinguishing part according to claim 1, wherein, The grilles are provided in a plurality of units and are spaced apart from each other. The side of the grille cover facing the grille communicates with the space formed by the plurality of grilles spaced apart from each other.

5. The arc-extinguishing part according to claim 4, wherein, The baffle plate is provided with a plurality of through holes that communicate with the space formed by the plurality of the grids that are spaced apart from each other.

6. The arc-extinguishing part according to claim 5, wherein, The grid cover includes a magnet cover that is received in the receiving space of the cover body, disposed on the baffle plate, and surrounding at least one of the sides of the arc-extinguishing magnet.

7. The arc-extinguishing part according to claim 6, wherein, The magnet cover includes an insulating material.

8. The arc-extinguishing part according to claim 6, wherein, The magnet cover includes: The first opening is open and is configured to overlap with and communicate with the plurality of through holes provided in the baffle plate; and The second opening is open and accommodates the arc-extinguishing magnet. The first opening and the second opening are spaced apart from each other.

9. The arc-extinguishing part according to claim 6, wherein, The grille cover includes: The grid section is accommodated in the accommodating space of the cover body and is disposed on the arc-extinguishing magnet and the magnet cover. The mesh portion includes a plurality of through holes that communicate with the through holes of the baffle plate.

10. The arc-extinguishing part according to claim 9, wherein, The grille cover includes an upper frame, which is combined with the cover body and covers the mesh portion. The upper frame includes a through-hole portion, which is formed through and communicates with the through-hole of the grid portion.

11. An air circuit breaker, in, include: Fixed contacts; The movable contact can move toward or away from the fixed contact; and The arc-extinguishing section, located adjacent to the fixed contact and the movable contact, extinguishes the electric arc generated when the fixed contact and the movable contact are separated. The arc-extinguishing part includes: Multiple support plates are arranged apart from and opposite to each other; A plurality of grilles are located between and respectively coupled to the plurality of support plates, and extend between one side facing the fixed contact and the movable contact and the other side opposite to the fixed contact and the movable contact; The cover body is respectively combined with a plurality of the support plates, and is disposed adjacent to and covers the other side of the plurality of the grilles; An arc-extinguishing magnet is housed in a receiving space disposed inside the cover body, and forms a magnetic field from the cover body toward the plurality of the grilles or from the plurality of the grilles toward the cover body; and A baffle plate is located in the receiving space of the cover body. The arc-extinguishing magnet is housed in the receiving space of the cover body and is placed on the blocking plate.

12. The air circuit breaker according to claim 11, wherein, include: A magnet cover is housed in the receiving space of the cover body and placed on the blocking plate, and surrounds the arc-extinguishing magnet.

13. The air circuit breaker according to claim 12, wherein, The baffle plate includes a plurality of through holes, which communicate with the spaces formed by the plurality of spaced-apart grilles. The magnet cover includes: A first opening is disposed overlapping with a plurality of the through holes, and is formed through and communicates with the plurality of the through holes; and The second opening is spaced apart from the first opening and extends through to form and accommodate the arc-extinguishing magnet.

14. The air circuit breaker according to claim 11, in, include: A movable contact holder, electrically connected to the movable contact, extends in the opposite direction to the arc-extinguishing part and is partially exposed to the outside; and The magnet section of the current transformer covers the portion of the movable contact frame that is exposed to the outside. The current transformer magnet section includes: The shell has an internal space; and A current transformer magnet is housed inside the housing, forming a magnetic field in the direction from the current transformer magnet section toward the arc-extinguishing section or from the arc-extinguishing section toward the current transformer magnet section.

15. The air circuit breaker according to claim 14, wherein, The arc-extinguishing magnet and the current transformer magnet are magnetized to have different polarities on their opposite sides.

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