Air circuit breaker

Abstract

Disclosed is an air circuit breaker. The air circuit breaker according to an embodiment of the present invention includes a CT magnet portion. The CT magnet portion is provided to the air circuit breaker and covers a movable contact exposed to the outside. A CT magnet is provided inside a housing forming the appearance of the CT magnet portion. The CT magnet independently forms a sub magnetic field or forms a main magnetic field together with an arc extinguishing magnet provided to an arc extinguishing portion. The magnetic field formed by the CT magnet causes the generated arc to be subjected to an electromagnetic force in the direction of the arc extinguishing portion. Thus, the generated arc can be rapidly moved and extinguished.

Description

Technical Field

[0001] This invention relates to air circuit breakers, and more specifically, to an air circuit breaker capable of effectively extinguishing electric arcs caused by current interruption. Background Technology

[0002] A circuit breaker is a device that allows or prevents the flow of electricity to the outside world by 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 an external power source or load.

[0003] The movable contact is movably disposed in 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, separate from each other. At this time, the current flowing between the movable and fixed contacts is not immediately extinguished, but transforms into 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, there is a risk of damage to various components of the circuit breaker. Furthermore, if the arc is directly expelled from the circuit breaker without further treatment, there is a risk of injury to the user.

[0006] To address this, circuit breakers are generally equipped with arc-extinguishing devices to extinguish and discharge electric arcs. The generated arc passes through the arc-extinguishing device, where its pressure increases, its movement speed accelerates, and it is simultaneously cooled before being discharged to the outside.

[0007] Therefore, it is necessary to quickly guide the generated electric arc to the arc extinguishing device.

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

[0009] However, this type of circuit breaker has a limitation: it can only be used in circuit breakers where an additional gas is used as the arc-extinguishing medium. That is, the existing literature only allows its use when SF6 (Sulfur hexafluoride) is used as the arc-extinguishing medium, 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 also discloses a current-limiting structure for an air circuit breaker. Specifically, it discloses a current-limiting structure for an air circuit breaker, the air circuit breaker comprising: a grid, which is stacked in an arc chamber to form a defined gap and has guide grooves to position the contacts; and a grid plate disposed on the side wall of the guide grooves of the grid.

[0011] However, while this type of circuit breaker can direct the arc towards the grid via a guide plate, it does not suggest a scheme for forming a path for arcs that do not flow towards the guide plate. That is, the existing literature has the limitation of not examining schemes for effectively forming paths for arcs that are 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 air circuit breaker with a structure that can solve the above-mentioned problems.

[0014] Firstly, an object of the present invention is to provide an air circuit breaker with a structure capable of rapidly extinguishing and moving the generated electric arc.

[0015] Another object of the present invention is to provide an air circuit breaker with a structure in which the magnet forming a magnetic field associated with the movement path of an electric arc is not damaged by the electric arc.

[0016] In addition, an object of the present invention is to provide an air circuit breaker that does not require excessive design changes to have a magnet that forms a magnetic field associated with the movement path of an electric arc.

[0017] In addition, an object of the present invention is to provide an air circuit breaker that does not require additional space for a magnet to form a magnetic field associated with the movement path of an electric arc.

[0018] In addition, an object of the present invention is to provide an air circuit breaker with a structure capable of forming a magnetic field associated with the movement path of an electric arc together with magnets disposed in other parts of the air circuit breaker.

[0019] Technical solutions to the problem

[0020] To achieve the above objectives, the present invention provides an air circuit breaker comprising: a fixed contact; a movable contact movable toward or away from the fixed contact; an arc-extinguishing section located adjacent to the fixed contact and the movable contact, for extinguishing an electric arc generated due to separation of the fixed contact and the movable contact; and a CT (Current Transformer) magnet section located on the opposite side of the fixed contact and the movable contact from the arc-extinguishing section, covering a portion of the movable contact, wherein the movable contact is energized to be connected to the movable contact; the CT magnet section includes a CT magnet that forms a magnetic field from the CT magnet section toward the arc-extinguishing section or from the arc-extinguishing section toward the CT magnet section.

[0021] Additionally, the CT magnet portion of the air circuit breaker may include a housing with an internal space, and the CT magnet may be accommodated within the space of the housing.

[0022] Additionally, the CT magnet of the air circuit breaker may include: a first surface, which is the side of the CT magnet facing the arc-extinguishing part; and a second surface, which is the side of the CT magnet opposite to the arc-extinguishing part; the first surface may be magnetized to either an N pole or a S pole, and the second surface may be magnetized to either an N pole or a S pole.

[0023] In addition, the movable contact of the air circuit breaker can extend in the opposite direction to the arc extinguishing part, the movable contact can be electrically connected to a position adjacent to one end of the movable contact, a portion of the other end of the movable contact can be exposed to the outside, and the CT magnet can be connected to the housing to cover the exposed portion of the movable contact.

[0024] Additionally, the CT magnet portion of the air circuit breaker may include a cover that covers the space by being combined with the housing.

[0025] Additionally, the air circuit breaker may include: an upper cover having an internal space to accommodate the fixed contact, the movable contact, and a portion of the arc-extinguishing section; and a lower cover, which is combined with the upper cover and has an internal space; the other end of the movable contact may extend from the movable contact toward the internal space of the lower cover, and the CT magnet may be combined with the outside of the lower cover.

[0026] Additionally, the arc-extinguishing section of the air circuit breaker may include: a pair of support plates configured to be spaced apart from each other and opposite to each other; a cover body, which is respectively coupled to the pair of support plates and located on the opposite side of the fixed contact relative to the support plates; and an arc-extinguishing magnet, which is housed in the internal space of the cover body and forms a magnetic field from the arc-extinguishing section toward the CT magnet section or from the CT magnet section toward the arc-extinguishing section.

[0027] In addition, the arc-extinguishing magnet and the CT magnet of the air circuit breaker can be magnetized to different polarities on their respective faces.

[0028] Additionally, the arc-extinguishing section of the air circuit breaker may include: a baffle plate, housed in the internal space of the cover body, with the arc-extinguishing magnet disposed on the baffle plate; and a magnet cover, housed in the internal space of the cover body, disposed on the baffle plate, and surrounding the arc-extinguishing magnet.

[0029] Invention Effects

[0030] According to various embodiments of the present invention, the following effects are achieved.

[0031] First, a CT magnet is installed in the CT magnet section. The CT magnet is located in the opposite direction to the arc-extinguishing section, separated by the fixed contact and the movable contact. The CT magnet generates a magnetic field from the arc-extinguishing section toward the CT magnet or from the CT magnet toward the arc-extinguishing section.

[0032] The electric arc generated by the separation of the fixed and movable contacts is subjected to the electromagnetic force generated by the magnetic field. The electromagnetic force is directed toward the arc-extinguishing part and toward the end of the grid provided in the arc-extinguishing part in the width direction.

[0033] As a result, the generated electric arc can quickly move towards the arc-extinguishing part and be extinguished.

[0034] In addition, the CT magnet is located in a position separated from the fixed and movable contacts. Specifically, the CT magnet is attached to the outside of the lower cover, which is attached to the upper cover that houses the fixed and movable contacts.

[0035] Furthermore, the CT magnet is housed within the internal space of the housing of the CT magnet section. This internal space is isolated from the outside by the connection between the housing and the cover. That is, the CT magnet is not exposed to the outside.

[0036] Therefore, even if an electric arc is generated inside the air circuit breaker, the CT magnet will not be damaged by the generated arc.

[0037] Furthermore, as mentioned above, the CT magnet is housed within the internal space of the housing. In embodiments where direct current flows through the air circuit breaker, it is not necessary to provide a configuration for current conversion within the internal space of the housing. That is, the internal space of the housing is an empty space.

[0038] Therefore, minimal design changes are required to accommodate CT magnets. Furthermore, the aforementioned structure also eliminates the need for additional space to accommodate the CT magnets.

[0039] In another embodiment, an arc-extinguishing magnet is provided in the arc-extinguishing section. The arc-extinguishing magnet independently forms a secondary magnetic field. Additionally, the arc-extinguishing magnet and the CT magnet together form the primary magnetic field.

[0040] The opposing surfaces of the arc-extinguishing magnet and the CT magnet are magnetized to have different polarities. As a result, a magnetic field is formed between the CT magnet and the arc-extinguishing magnet, pointing in either direction.

[0041] The generated electric arc is subjected to electromagnetic force due to the magnetic field. As a result, the path of the electric arc is formed in the direction of being discharged outward through the arc-extinguishing part.

[0042] Therefore, the generated electric arc can be rapidly moved outward and extinguished by the magnetic field formed by the CT magnet and the arc-extinguishing magnet. Attached Figure Description

[0043] Figure 1 This is a perspective view showing an air circuit breaker according to an embodiment of the present invention.

[0044] Figure 2 It shows from Figure 1 A 3D view of an air circuit breaker with the back cover removed.

[0045] Figure 3 It shows from Figure 1 Front view of the air circuit breaker with the back cover removed.

[0046] Figure 4 It shows from Figure 1 A top view of an air circuit breaker with the back cover removed.

[0047] Figure 5 It shows from Figure 1 A cross-sectional view of an air circuit breaker with the back cover removed.

[0048] Figure 6 It shows the setting in Figure 1 A three-dimensional diagram of the permanent magnet of an air circuit breaker.

[0049] Figure 7 It shows the setting in Figure 1 Front view of the permanent magnet of an air circuit breaker.

[0050] Figure 8 It shows the setting in Figure 1 An exploded perspective view of the current transformer housing of an air circuit breaker.

[0051] Figure 9 It is shown Figure 8 Front view of the current transformer housing.

[0052] Figure 10 It shows the setting in Figure 1 A perspective view of an embodiment of the arc-extinguishing section of an air circuit breaker.

[0053] Figure 11 It is shown Figure 10 A front view of one embodiment of the arc-extinguishing unit shown.

[0054] Figure 12 It is shown Figure 10 A top view of one embodiment of the arc-extinguishing section shown.

[0055] Figure 13 It is shown Figure 10 A side view of one embodiment of the arc-extinguishing unit shown.

[0056] Figure 14 It shows from Figure 10 The diagram shows the state of the arc-extinguishing section with the arc cover disassembled.

[0057] Figure 15 It shows from Figure 14 A three-dimensional view showing the state of the disassembled grid section of the arc-extinguishing part.

[0058] 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.

[0059] Figure 17 It shows from Figure 15 The diagram shows the state of the upper magnet part of the arc-extinguishing section after disassembly.

[0060] Figure 18 It shows from Figure 15 The top view shows the state of the arc-extinguishing section with the upper magnet section removed.

[0061] Figure 19 It shows the setting in Figure 1 A perspective view of another embodiment of the arc-extinguishing section of an air circuit breaker.

[0062] Figure 20 It shows the setting in Figure 1 A front view of another embodiment of the arc-extinguishing section of an air circuit breaker.

[0063] Figure 21 It shows from Figure 19 A three-dimensional view showing the state of the arc-extinguishing section with the support plate removed.

[0064] Figure 22 It shows from Figure 19 The front view shows the state of the arc-extinguishing section with the support plate removed.

[0065] Figure 23 It shows from Figure 19 The image shows a bottom view of the arc-extinguishing section with the support plate removed.

[0066] 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.

[0067] Figure 25 It shows from Figure 19 The front view shows the state of the arc-extinguishing section with a portion of the grille removed.

[0068] 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.

[0069] Figure 27 It shows the setting in Figure 19 An exploded perspective view of the arc-extinguishing magnet section of the arc-extinguishing unit is shown.

[0070] Figure 28 This shows a view of the setting from another angle. Figure 19 An exploded perspective view of the arc-extinguishing magnet section of the arc-extinguishing unit is shown.

[0071] Figure 29 It shows the setting in Figure 19 The front view of the arc-extinguishing magnet section of the arc-extinguishing unit shown.

[0072] Figure 30 It shows the setting in Figure 19 The top view of the arc-extinguishing magnet section of the arc-extinguishing unit shown.

[0073] Figure 31 This is a front view illustrating an example of a magnetic field formed in a frame and the path of an electric arc formed according to the magnetic field, as per an embodiment of the present invention.

[0074] Figure 32 This is a top view illustrating an example of a magnetic field formed in a frame and the path of an electric arc formed according to the magnetic field, according to an embodiment of the present invention.

[0075] Figure 33 It is shown in Figure 10 A front view of an example of the magnetic field formed by the arc-extinguishing section of the embodiment and the path of the electric arc formed according to the magnetic field.

[0076] Figure 34 It is shown in Figure 10 A cross-sectional view of an example of the magnetic field formed by the arc-extinguishing section of the embodiment and the path of the arc formed according to the magnetic field.

[0077] Figure 35 It is shown in Figure 10 A cross-sectional view of an example of the magnetic field formed by the arc-extinguishing section of the embodiment and the path of the arc formed according to the magnetic field.

[0078] Figure 36 It is shown in Figure 10 A cross-sectional view of the magnetic field formed by the arc-extinguishing part of the embodiment and another example of the path of the arc formed according to the magnetic field.

[0079] Figure 37 It is shown in including Figure 8 The current transformer 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 of the embodiment and the path of the arc generated therefrom.

[0080] Figure 38 It is shown in the inclusion Figure 8 The current transformer housing and Figure 10 A front view of another example of the magnetic field formed by the air circuit breaker of the arc-extinguishing section of the embodiment and the path of the arc formed thereunder.

[0081] Figure 39 It is shown in the inclusion Figure 8 The current transformer housing and Figure 10 A front view of an example of the magnetic field generated by the air circuit breaker of the arc-extinguishing section of an embodiment and the path of the arc formed thereunder.

[0082] Figure 40 It is shown in the inclusion Figure 8 The current transformer 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 of the embodiment and the path of the arc generated therefrom.

[0083] Figure 41 It shows that it was formed in Figure 19 A front view of an example of the magnetic field of the arc-extinguishing part of an embodiment and the path through which an electric arc is formed.

[0084] Figure 42 It shows that it was formed in Figure 19 A bottom view of an example of the magnetic field of the arc-extinguishing part of the embodiment and the path of the electric arc formed therefrom.

[0085] Figure 43 It shows that it was formed in Figure 19A front view of the magnetic field of the arc-extinguishing part of the embodiment and the path of the arc formed therefrom, as in another example.

[0086] Figure 44 It is shown in Figure 19 A bottom view of the magnetic field formed by the arc-extinguishing part of the embodiment and another example of the path of the electric arc formed therefrom. Detailed Implementation

[0087] Hereinafter, with reference to the accompanying drawings, the arc-extinguishing part of the present invention and the air circuit breaker including therein will be described in detail.

[0088] In the following description, in order to clarify the features of the present invention, the description of some constituent elements may be omitted.

[0089] 1. Definition of terms

[0090] In the following description, "energized" means the transfer of current or electrical signals between one or more components.

[0091] As used in the following description, "magnet" refers to any object capable of magnetizing a magnet or generating a magnetic field. In one embodiment, the magnet may be a permanent magnet or an electromagnet.

[0092] In the following description, "air circuit breaker" refers to a circuit breaker that uses air or compressed air to extinguish electric arcs. The various components described below are based on applications of air circuit breakers.

[0093] However, the various 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, etc.

[0094] In the following description, the term "Main Magnetic Field" refers to the magnetic field formed between a plurality of magnets arranged in close proximity to each other. That is, the Main Magnetic Field (MMF) is a magnetic field formed from any one of the plurality of magnets toward the other.

[0095] In the following description, "submagnetic field" refers to the magnetic field formed by any single magnet itself. That is, the submagnetic field (SMF) is a magnetic field formed from one side of any single magnet to the other side.

[0096] The terms "top," "bottom," "right," "left," "front," and "rear" used in the following description can be found in [reference needed]. Figure 1 Understanding the coordinate system shown.

[0097] 2. Description of the configuration of the air circuit breaker 10 according to an embodiment of the present invention

[0098] Reference Figures 1 to 5 The air circuit breaker 10 of this embodiment includes a cover 100, a drive part 200, and a disconnection part 300.

[0099] 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.

[0100] 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, and the cover magnet part 400, the CT magnet part 500, and the arc extinguishing parts 600 and 700 will be described respectively.

[0101] (1) Explanation of cover 100

[0102] Reference Figures 1 to 5 The air circuit breaker 10 of this embodiment includes a cover 100.

[0103] The cover 100 forms the appearance of the air circuit breaker 10. In addition, a space is formed inside the cover 100, in which the various components for the operation of the air circuit breaker 10 can be installed.

[0104] That is, the cover 100 functions as a housing.

[0105] 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.

[0106] In the illustrated embodiment, the cover 100 is a quadrangular prism shape with its height defined by the vertical direction. The shape of the cover 100 can be formed in any shape that allows the components for the operation of the air circuit breaker 10 to be installed inside.

[0107] 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.

[0108] In the illustrated embodiment, the cover 100 includes an upper cover 110 and a lower cover 120.

[0109] 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 formed integrally.

[0110] A space is formed inside the upper cover 110. Various components of the air circuit breaker 10 are installed in this space. In one embodiment, a disconnecting part 300 and an arc-extinguishing part 600, 700, etc., may be installed in the space inside the upper cover 110.

[0111] The interior space of the upper cover 110 is connected to the interior space of the lower cover 120. Components such as the disconnection part 300 can be accommodated across the interior spaces of the upper cover 110 and the lower cover 120.

[0112] Arc-extinguishing parts 600 and 700 are located on one side of the upper cover 110, specifically on the upper side in the illustrated embodiment. A portion of the arc-extinguishing parts 600 and 700 may be exposed on the upper side of the upper cover 110. An electric arc generated within the interior space of the upper cover 110 can pass through the arc-extinguishing parts 600 and 700 and be extinguished before being discharged to the outside of the air circuit breaker 10.

[0113] The fixed contact 310 of the disconnect portion 300 is on the other side of the upper cover 110, and in the illustrated embodiment, it is exposed on the front side. The fixed contact 310 can be electrically connected to an external power source or load through the exposed portion.

[0114] In the illustrated embodiment, the upper cover 110 includes a first upper cover 111 and a second upper cover 112.

[0115] The first upper cover 111 is configured to cover one side of the upper side of the air circuit breaker 10, which is the front side in the illustrated embodiment. The first upper cover 111 is attached to the second upper cover 112 by any fastening component.

[0116] An opening is formed in the first upper cover 111. The fixing contact 310 can be exposed to the outside through the opening. In the illustrated embodiment, three openings are formed along the left-right direction.

[0117] A cover magnet 400 may be disposed on the first upper cover 111. The cover magnet 400 may be disposed in a direction that is spaced apart from the arc extinguishing parts 600 and 700.

[0118] The second upper cover 112 is configured to cover the other side of the upper side of the air circuit breaker 10, and in the illustrated embodiment, it covers the rear side. The second upper cover 112 can be attached to the first upper cover 111 by any fastening component.

[0119] A cover magnet portion 400 may be provided on the second upper cover 112. As described above, a cover magnet portion 400 may also be provided on the first upper cover 111. That is, a cover magnet portion 400 may be provided on either the first upper cover 111 or the second upper cover 112.

[0120] The lower cover 120 forms the lower side of the cover portion 100. The lower cover 120 is located below the upper cover 110.

[0121] A space is formed inside the lower cover 120. Various components of the air circuit breaker 10 are installed in the space. In one embodiment, the internal space of the lower cover 120 may house a drive unit 200 and a disconnection unit 300, etc.

[0122] The interior space of the lower cover 120 is connected to the interior space of the upper cover 110. The disconnection part 300 and the like are configured to be accommodated across the interior spaces of the lower cover 120 and the upper cover 110.

[0123] The movable contact 320 of the disconnect portion 300 is located on one side of the lower cover 120, which is the front in the illustrated embodiment. The movable contact 320 can be exposed to the outside through an opening formed in the lower cover 120. The movable contact 320 can be energized and connected to an external power source or load through the exposed portion.

[0124] The opening in the lower cover 120, including the opening exposing the movable contact 320, is connected to the CT magnet portion 500, which will be described later. A detailed description of this will follow.

[0125] (2) Description of drive unit 200

[0126] Reference Figures 1 to 5 The air circuit breaker 10 of this embodiment includes a drive unit 200.

[0127] The drive unit 200 rotates as the fixed contact 311 and the movable contact 321 of the disconnecting unit 300 separate, thereby performing a trip mechanism. Therefore, the air circuit breaker 10 can disconnect the power supply to the outside, and the user can perceive that an action to disconnect the power supply has been performed.

[0128] The drive unit 200 is housed inside the air circuit breaker 10. Specifically, a portion of the drive unit 200 is housed within the space inside the cover 100. Additionally, the remaining portion (not marked) of the drive unit 200 is housed inside a housing located on one side of the cover 100 (the rear side of the illustrated embodiment).

[0129] The drive unit 200 is connected to the disconnection unit 300. Specifically, the crossbar 220 of the drive unit 200 is configured to rotate together with the movable contact 320 of the disconnection unit 300.

[0130] Therefore, if the movable contact 320 of the disconnecting part 300 rotates, the driving part 200 can rotate together. The driving part 200 is rotatably housed inside the air circuit breaker 10.

[0131] In the illustrated embodiment, the drive unit 200 includes a projection unit 210, a crossbar 220, and a rod 230.

[0132] The projection section 210 can rotate together with the movable contact 320 of the disconnection section 300 as it rotates away from the fixed contact 310. The projection section 210 is connected to the crossbar 220 and the rod 230.

[0133] Specifically, one end of the projection section 210 is constrained by the crossbar 220. An elastic member is provided at the other end of the projection section 210. Thus, when the fixed contact 311 and the movable contact 321 are in contact, the projection section 210 stores restoring force by applying pressure to the elastic member. The external force for applying this pressure can be provided by rotating the crossbar 220 to the state of the fixed contact 310.

[0134] If the movable contact 321 separates from the fixed contact 311, the movable contact 320 rotates away from the fixed contact 310. As a result, the crossbar 220 also rotates, and one end of the projection part 210 is released and rotates by the restoring force provided by the elastic member.

[0135] The projection unit 210 is connected to the lever 230. As the projection unit 210 rotates to strike the lever 230, the lever 230 can also rotate and perform a tripping action.

[0136] The crossbar 220 is connected to the movable contact 320 and rotates together with the movable contact 320. As a result, the projection part 210, which is constrained by the crossbar 220, is released, thereby enabling the tripping operation to be performed.

[0137] The crossbar 220 can extend between a plurality of disconnections 300. In the illustrated embodiment, a total of three movable contacts 320 of the disconnections 300 are provided and arranged in a left-right direction. The crossbar 220 can connect the plurality of movable contacts 320 arranged in the left-right direction by passing through them.

[0138] The crossbar 220 constrains the projection section 210 by contacting one end of the projection section 210. If the crossbar 220 rotates together with the movable contact 320, the crossbar 220 releases the one end of the projection section 210.

[0139] The lever 230 can be rotated by being struck by the rotating projection part 210. A portion of the lever 230 can protrude to the outside of the air circuit breaker 10. If a tripping action is performed by the disconnecting part 300, the lever 230 rotates in a predetermined direction.

[0140] Therefore, users can easily recognize that a tripping action has been performed. Additionally, users can rotate lever 230 to restore the air circuit breaker 10 to a energized state.

[0141] Since the process of performing a tripping action through the drive unit 200 is known technology, a detailed description thereof is omitted.

[0142] (3) Explanation of the disconnection part 300

[0143] Reference Figures 1 to 5 The air circuit breaker 10 of this embodiment includes a disconnection part 300.

[0144] The disconnecting section 300 includes a fixed contact 310 and a movable contact 320 that are either separated from or in contact with each other. If the fixed contact 310 and the movable contact 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 310 and the movable contact 320 are separated, the air circuit breaker 10 is de-energized with the external power source or load.

[0145] The disconnecting part 300 is housed inside the air circuit breaker 10. Specifically, the disconnecting part 300 is rotatably housed within the interior space of the cover part 100.

[0146] The disconnector 300 can be energized externally. In one embodiment, current can flow from an external power source or load into either the fixed contact 310 or the movable contact 320. Alternatively, current can flow from the other of the fixed contact 310 and the movable contact 320 out to an external power source or load.

[0147] A portion of the disconnecting part 300 may be exposed to the outside of the air circuit breaker 10. Therefore, the disconnecting part 300 can be energizedly connected to an external power source or load via a component such as a wire (not shown).

[0148] A plurality of disconnecting portions 300 may be provided. The plurality of disconnecting portions 300 may be arranged spaced apart from each other in one direction. A partition wall may be provided between each disconnecting portion 300 to prevent interference between the currents flowing in each disconnecting portion 300.

[0149] In the illustrated embodiment, three disconnecting sections 300 are provided. Furthermore, the three disconnecting sections 300 are spaced apart from each other along the left-right direction of the air circuit breaker 10. This is because, in this embodiment of the invention, the air circuit breaker 10 carries three-phase currents such as R-phase, S-phase, and T-phase, or U-phase, V-phase, and W-phase.

[0150] The number of disconnectors 300 can vary depending on the number of phases of the current flowing in the air circuit breaker 10.

[0151] In the illustrated embodiment, the disconnection part 300 includes a fixed contact 310 and a movable contact 320.

[0152] The fixed contact 310 can be in contact with or separated from the movable contact 320. If the movable contact 320 is in contact with the fixed contact 310, the air circuit breaker 10 can be energized to an external power source or load. If the fixed contact 310 and the movable contact 320 are separated, the air circuit breaker 10 is de-energized to an external power source or load.

[0153] As can be seen from the name, the fixed contact 310 is fixedly disposed on the cover portion 100. Therefore, the contact and separation of the fixed contact 310 and the movable contact 320 are achieved by rotating the movable contact 320.

[0154] In the illustrated embodiment, the fixed contact 310 is housed within the interior space of the upper cover 110.

[0155] A portion of the fixed contact 310 may be exposed to the outside of the air circuit breaker 10. Through the exposed portion, the fixed contact 310 can be energizedly connected to an external power source or load.

[0156] In the illustrated embodiment, the fixed contact 310 can be exposed to the outside through an opening formed on the front side of the upper cover 110.

[0157] The fixed contact 310 may be formed of a conductive material. In one embodiment, the fixed contact 310 may be formed of copper (Cu) or iron (Fe) and alloys thereof.

[0158] In the illustrated embodiment, the fixed contact 310 includes a fixed contact 311.

[0159] 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 310 facing the movable contact 320, which is the rear side in the illustrated embodiment.

[0160] Fixed contact 311 is energized with fixed contact 310. In the illustrated embodiment, fixed contact 311 is located behind fixed contact 310. In one embodiment, fixed contact 311 may be integrally formed with fixed contact 310.

[0161] When the fixed contact 311 and the movable contact 321 are in contact, the air circuit breaker 10 can be energized and connected to an external power source or load. Conversely, when the fixed contact 311 is separated from the movable contact 321, the air circuit breaker 10 is de-energized from the external power source or load.

[0162] The movable contact 320 can contact or separate from the fixed contact 310. As mentioned above, the air circuit breaker 10 can be energized or disconnected from an external power source or load by contacting and separating the movable contact 320 and the fixed contact 310.

[0163] The movable contact 320 is rotatably disposed in the interior space of the cover portion 100. The movable contact 320 can rotate toward the fixed contact 310 and away from the fixed contact 310.

[0164] In the illustrated embodiment, the movable contact 320 is housed within the interior spaces of the upper cover 110 and the lower cover 120. As previously mentioned, the interior spaces of the upper cover 110 and the lower cover 120 are in communication with each other.

[0165] A portion of the movable contact 320 may be exposed to the outside of the air circuit breaker 10. Through the exposed portion, the movable contact 320 can be energizedly connected to an external power source or load.

[0166] In the illustrated embodiment, the movable contact 320 is exposed to the outside through an opening formed on the front side of the lower cover 120.

[0167] The opening can be covered by the CT magnet portion 500, which will be described later. Thus, the opening can be closed except for the portion of the movable contact 320 that is energized by an external power source or load.

[0168] The movable contact 320 may be formed of a conductive material. In one embodiment, the movable contact 320 may be formed of copper or iron and alloys thereof.

[0169] The movable contact 320 is connected to the drive unit 200. Specifically, the movable contact 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 320.

[0170] If the movable contact 320 rotates, the crossbar 220 can also rotate. Thus, as mentioned above, a tripping action can be performed by the operation of the drive unit 200.

[0171] In the illustrated embodiment, the movable contact 320 includes a movable contact 321 and a rotation shaft 322.

[0172] The movable contact 321 can contact or separate from the fixed contact 311. The movable contact 321 is located on the side of the movable contact 320 facing the fixed contact 310, which is the front side in the illustrated embodiment.

[0173] The movable contact 321 can rotate together with the movable contact 320. If the movable contact 320 rotates toward the fixed contact 310, the movable contact 321 can also rotate toward the fixed contact 311 and make contact with the fixed contact 311.

[0174] Additionally, if the movable contact 320 rotates away from the fixed contact 310, the movable contact 321 can also separate from the fixed contact 311.

[0175] The movable contact 321 is energized with the movable contact 320. In the illustrated embodiment, the movable contact 321 is located on the front side of the movable contact 320. In one embodiment, the movable contact 321 may be integrally formed with the movable contact 320.

[0176] As mentioned above, the air circuit breaker 10 is energized or disconnected from an external power source or load by the contact and separation of the movable contact 321 and the fixed contact 311.

[0177] When the fixed contact 311 and the movable contact 321 are in contact with each other and thus energized, an electric arc is generated if the fixed contact 311 and the movable contact 321 separate. The air circuit breaker 10 of this embodiment includes various configurations for effectively forming a path for the generated electric arc. This will be described later.

[0178] The rotating shaft 322 is a portion of the movable contact 320 that is rotatably connected to the cover portion 100. The movable contact 320 can rotate about the rotating shaft 322 in the direction of the fixed contact 310 or away from the fixed contact 310.

[0179] The rotating shaft 322 is located on the opposite side of the movable contact 320 from the fixed contact 310, and in the illustrated embodiment, it is located on the rear side.

[0180] 3. Description of the cover magnet portion 400 in an embodiment of the present invention

[0181] Reference Figures 6 to 7 The air circuit breaker 10 of this embodiment includes a cover magnet portion 400.

[0182] The magnet section 400 generates a magnetic field. Through this magnetic field, an arc path AP can be formed, which provides a path for the flow of the arc generated in the arc-extinguishing sections 600 and 700.

[0183] The magnet cover 400 can be arranged in any form that can generate a magnetic field. In one embodiment, the magnet cover 400 can be a permanent magnet or an electromagnet, etc.

[0184] 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.

[0185] In the illustrated embodiment, a plurality of arc-extinguishing parts 600 and 700 are located adjacent to a plurality of fixed contacts 311.

[0186] In one embodiment, the magnet cover 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 magnet cover 400 may be located between the fixed contacts 311 and the arc-extinguishing portions 600 and 700 in the vertical direction.

[0187] In the illustrated embodiment, one side of the cover magnet portion 400 is attached to the second upper cover 112, while the other side extends toward the first upper cover 111. That is, the cover magnet portion 400 extends in the front-to-back direction.

[0188] In the embodiment, the first upper cover 111 may be recessed to form a receiving groove for accommodating the cover magnet portion 400.

[0189] Alternatively, the cover magnet portion 400 can be attached to the first upper cover 111 and extend toward the second upper cover 112. That is, the cover magnet portion 400 can be attached to either the first upper cover 111 or the second upper cover 112.

[0190] In the embodiment, the second upper cover 112 may be recessed to form a receiving groove for accommodating the cover magnet portion 400.

[0191] That is, the first upper cover 111 and the second upper cover 112 are respectively formed with receiving grooves for accommodating a portion and the remaining portion of the cover magnet portion 400.

[0192] Therefore, if the cover magnet portion 400 is joined to 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.

[0193] A plurality of cover magnet portions 400 may be provided. The plurality of cover magnet portions 400 may be arranged spaced apart from each other. In the illustrated embodiment, four cover magnet portions 400 are provided.

[0194] Each cover magnet 400 can be disposed on the outer side of each of the arc-extinguishing parts 600 and 700 arranged side by side, and between each of the arc-extinguishing parts 600 and 700.

[0195] 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.

[0196] 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 side by side in the left-right direction.

[0197] 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 cover a portion of the outer side (i.e., on the left) of the leftmost arc-extinguishing part 600, 700 among the plurality of arc-extinguishing parts 600, 700.

[0198] 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 secondary magnetic field SMF on its own.

[0199] The first cover magnet 410 includes a first surface 411 and a second surface 412.

[0200] The first surface 411 is defined by one side of the first cover magnet 410 facing the grid cover 630, 730 of the arc extinguishing portions 600, 700. In the illustrated embodiment, the first surface 411 forms the upper side surface of the first cover magnet 410.

[0201] The second surface 412 is defined by the opposite side of the first cover magnet 410, which is opposite to the grid cover 630, 730 of the arc extinguishing parts 600, 700. In the illustrated embodiment, the second surface 412 forms the lower side surface of the first cover magnet 410.

[0202] 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 that face each other.

[0203] The first surface 411 can be magnetized as the S pole. Additionally, the second surface 412 can be magnetized as the N pole.

[0204] That is, the first surface 411 and the second surface 412 can be magnetized to have opposite polarities. Therefore, a secondary magnetic field SMF can be formed between the first surface 411 and the second surface 412.

[0205] The second cover magnet 420 is located between any one of the plurality of arc-extinguishing parts 600 and 700. In the illustrated embodiment, the second cover magnet 420 is located between the leftmost arc-extinguishing part 600 and 700 and the central arc-extinguishing part 600 and 700.

[0206] The second cover magnet 420 is configured to cover a portion of the inner side (i.e., the right side) of the leftmost arc-extinguishing part 600, 700 and a portion of the inner side (i.e., the left side) of the central arc-extinguishing part 600, 700.

[0207] 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 itself can form a secondary magnetic field SMF.

[0208] The second cover magnet 420 includes a first surface 421 and a second surface 422.

[0209] The first surface 421 is defined by one side of the second cover magnet 420 facing the grid cover 630, 730 of the arc extinguishing portions 600, 700. In the illustrated embodiment, the first surface 421 forms the upper side surface of the second cover magnet 420.

[0210] The second surface 422 is defined by the opposite side of the second cover magnet 420 to the grid cover 630, 730 of the arc extinguishing portions 600, 700. In the illustrated embodiment, the second surface 422 forms the lower side surface of the second cover magnet 420.

[0211] 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 that face each other.

[0212] The first surface 421 is 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 have opposite polarities. Thus, a secondary magnetic field SMF can be formed between the first surface 421 and the second surface 422.

[0213] The third cover magnet 430 is located between another of 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.

[0214] The third cover magnet 430 is configured to cover a portion of the inner side (i.e., the right side) of the central arc-extinguishing part 600, 700 and a portion of the inner side (i.e., the left side) of the leftmost arc-extinguishing part 600, 700.

[0215] 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 secondary magnetic field SMF on its own.

[0216] The third cover magnet 430 includes a first surface 431 and a second surface 432.

[0217] The first surface 431 is defined by one side of the third cover magnet 430 facing the grid cover 630, 730 of the arc extinguishing portions 600, 700. In the illustrated embodiment, the first surface 431 forms the upper side surface of the third cover magnet 430.

[0218] The second surface 432 is defined by the opposite side of the third cover magnet 430, which is opposite to the grid cover 630, 730 of the arc extinguishing parts 600, 700. In the illustrated embodiment, the second surface 432 forms the lower side surface of the third cover magnet 430.

[0219] 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 that face each other.

[0220] 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 have opposite polarities. Thus, a secondary magnetic field SMF can be formed between the first surface 431 and the second surface 432.

[0221] 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 cover a portion of the outside (i.e., on the right) of the rightmost arc-extinguishing part 600, 700 among the plurality of arc-extinguishing parts 600, 700.

[0222] The fourth cover magnet 440 can form a primary magnetic field (MMF) with the third cover magnet 430. In addition, the fourth cover magnet 440 can form a secondary magnetic field (SMF) on its own.

[0223] The fourth cover magnet 440 includes a first surface 441 and a second surface 442.

[0224] The first surface 441 is defined by one side of the fourth cover magnet 440 facing the grid cover 630, 730 of the arc extinguishing portions 600, 700. In the illustrated embodiment, the first surface 441 forms the upper side surface of the fourth cover magnet 440.

[0225] The second surface 442 is defined by the opposite side of the fourth cover magnet 440, which is opposite to the grid cover 630, 730 of the arc extinguishing parts 600, 700. In the illustrated embodiment, the second surface 442 forms the lower side surface of the fourth cover magnet 440.

[0226] 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 that face each other.

[0227] 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 have opposite polarities. Thus, a secondary magnetic field SMF can be formed between the first surface 441 and the second surface 442.

[0228] The thickness of the second cover magnet 420 can be greater than the thickness of the first cover magnet 410 and the fourth cover magnet 440. As mentioned above, since the second cover magnet 420 can form a main magnetic field MMF with the first cover magnet 410 and the third cover magnet 430, this is to ensure sufficient magnetic force.

[0229] Similarly, the thickness of the third cover magnet 430 can also be greater than the thickness of the first cover magnet 410 and the fourth cover magnet 440. As mentioned above, since the third cover magnet 430 can form a main magnetic field MMF with the second cover magnet 420 and the fourth cover magnet 440, this is to ensure sufficient magnetic force.

[0230] In one embodiment, the thickness of the third cover magnet 430 and the thickness of the second cover magnet 420 can be the same. Additionally, the thickness of the first cover magnet 410 and the thickness of the fourth cover magnet 440 can be the same.

[0231] 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.

[0232] Furthermore, with the cover magnet 400 of this embodiment provided, the generated electric arc can effectively flow toward the arc extinguishing parts 600 and 700. This is achieved through the main magnetic field MMF and the secondary magnetic field SMF formed by the cover magnet 400. This will be explained in detail later.

[0233] 4. Description of the CT (Current Transformer) magnet section 500 according to an embodiment of the present invention

[0234] Reference Figure 1 , Figure 8 as well as Figure 9 The air circuit breaker 10 of this embodiment includes a CT magnet section 500.

[0235] The CT magnet part 500 can be detachably combined with the lower cover 120 to cover the opening of the lower cover 120 that exposes a portion of the movable contact 320.

[0236] Additionally, a CT magnet 530 is included inside the CT magnet section 500, thereby forming a magnetic field for forming the path AP of the electric arc.

[0237] A plurality of CT magnet units 500 may be provided. In the illustrated embodiment, the movable contact 320 and the opening of the lower cover 120 may be provided with three. Thus, three CT magnet units 500 may also be provided.

[0238] A space is formed inside the CT magnet section 500. The CT magnet 530 can be accommodated in the space. When the current flowing in the air circuit breaker 10 is alternating current, various components for the current transformer can be installed in the space.

[0239] The following description will be based on the premise that direct current flows in the air circuit breaker 10 of this embodiment.

[0240] 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.

[0241] The housing 510 forms the appearance of the CT magnet part 500. The housing 510 is detachably attached to the lower cover 120 and covers the opening of the lower cover 120.

[0242] A space 520 is formed inside the housing 510. The space 520 can accommodate the CT magnet 530. As described above, in the embodiment where alternating current flows in the air circuit breaker 10, various configurations for current conversion can be installed in the space 520.

[0243] Conversely, in embodiments where direct current flows in the air circuit breaker 10, no components for current conversion are required. Therefore, it can be understood that the embodiment in which the CT magnet 530 is housed in the space 520 is in the case where direct current flows in the air circuit breaker 10.

[0244] An opening is formed inside the housing 510. The opening communicates with an opening in the lower cover 120. The movable contact 320 can be exposed to the outside through the opening.

[0245] The space portion 520 is defined by a space formed inside the housing 510. The space portion 520 may be a space surrounded by the outer surface and the inner surface of the housing 510.

[0246] The space 520 houses the CT magnet 530. As described above, this embodiment is in the case where alternating current flows through the air circuit breaker 10.

[0247] The space portion 520 includes an open portion. The open portion is formed on the side of the space portion 520 opposite to the cover portion 100, which is the front side in the illustrated embodiment. The open portion can be closed by the cover portion 540.

[0248] In the illustrated embodiment, the space portion 520 surrounds the opening formed inside the housing 510 and is defined by the space surrounded by the outer surface of the housing 510.

[0249] 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.

[0250] The CT magnet 530 generates a magnetic field. Through this magnetic field, an arc path AP can be formed as a path for the arc flow generated in the arc extinguishing sections 600 and 700.

[0251] Specifically, the CT magnet 530 generates 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.

[0252] As a result, the generated electric arc is subjected to electromagnetic forces directed toward both sides of the grid 720 provided in the arc-extinguishing sections 600 and 700. Consequently, the arc path AP is formed toward the peaks formed on both sides of the grid 720, thereby enabling the electric arc to flow effectively toward the arc-extinguishing sections 600 and 700.

[0253] The CT magnet 530 can be arranged in any form capable of forming a magnetic field. In one embodiment, the CT magnet 530 can be a permanent magnet or an electromagnet, etc.

[0254] The CT magnet 530 is attached 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 attached to the side of the housing 510 facing the cover 100, which is the rear side in the illustrated embodiment.

[0255] In one embodiment, the CT magnet 530 may also be attached to the surface surrounding the opening of the housing 510. In this embodiment, the CT magnet 530 can be attached to the housing 510 more stably.

[0256] 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.

[0257] 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.

[0258] To prevent the coupled CT magnets 530 from separating and shaking arbitrarily, fixing components such as screws or frames (not shown) can be provided.

[0259] The CT magnet 530 includes a first surface 531 and a second surface 532.

[0260] The first surface 531 can be defined by one 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.

[0261] Therefore, the first surface 531 can be defined by the upper surface of the CT magnet 530.

[0262] The second surface 532 can be defined by the side of the CT magnet 530 opposite to the arc-extinguishing parts 600 and 700. In other words, the second surface 532 can be defined by the lower side of the CT magnet 530.

[0263] 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 that face each other.

[0264] The first surface 531 can be magnetized to either an N pole or a S pole. Similarly, the second surface 532 can be magnetized to either an N pole or a S pole. That is, the first surface 531 and the second surface 532 are magnetized to opposite polarities. This creates a secondary magnetic field (SMF) between the first surface 531 and the second surface 532.

[0265] As described later, in one embodiment of the present invention, the arc-extinguishing part 600 may be provided with an arc-extinguishing magnet 634. In the embodiment, a main magnetic field MMF can be formed between the first surface 531 and the first surface 633a of the arc-extinguishing magnet 634.

[0266] As described above, embodiments in which direct current flows in the air circuit breaker 10 do not require components for current conversion.

[0267] Therefore, in this embodiment, when direct current flows in the air circuit breaker 10, a CT magnet 530 is provided in the CT magnet section 500. The CT magnet 530 itself forms a secondary magnetic field SMF, and together with the arc-extinguishing magnet 634 of the arc-extinguishing section 600, forms a primary magnetic field MMF.

[0268] Therefore, the generated electric arc can be effectively extinguished by the arc-extinguishing section 600. A detailed explanation of this will follow later.

[0269] 5. Description of the arc-extinguishing part 600 according to an embodiment of the present invention

[0270] Reference Figures 10 to 18 An air circuit breaker 10 according to an embodiment of the present invention includes an arc extinguishing section 600.

[0271] The arc-extinguishing section 600 is configured to extinguish the electric arc generated by the separation of the fixed contact 311 and the movable contact 321. The generated electric arc is extinguished and cooled as it passes through the arc-extinguishing section 600, and then discharged to the outside of the air circuit breaker 10.

[0272] 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.

[0273] A portion of the arc-extinguishing part 600 is housed in the cover 100. The remaining portion of the arc-extinguishing part 600, excluding the externally exposed portion, can be housed within the interior space of the cover 100. In the illustrated embodiment, a portion of the arc-extinguishing part 600 can be housed on the upper side of the upper cover 110.

[0274] The configuration can be changed depending on the positions of the fixed contact 311 and the movable contact 312. That is, the arc extinguishing part 600 can be located near the fixed contact 311 and the movable contact 312. As a result, 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.

[0275] A plurality of arc-extinguishing sections 600 may be provided. The plurality of arc-extinguishing sections 600 may be physically and electrically isolated from each other. In the illustrated embodiment, three arc-extinguishing sections 600 are provided. This is because, as mentioned above, three-phase current flows in the air circuit breaker 10 of this embodiment of the invention.

[0276] 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.

[0277] It can be understood that each arc-extinguishing section 600 is configured to extinguish the electric arc generated when the phase current flowing in each disconnection section 300 is disconnected.

[0278] The arc-extinguishing sections 600 can be configured to be adjacent to each other. In the illustrated embodiment, three arc-extinguishing sections 600 are arranged side by side along the left-right direction of the air circuit breaker 10.

[0279] In this embodiment, the arc-extinguishing section 600 includes an arc-extinguishing magnet 634. The arc-extinguishing magnet 634 forms a path AP for the arc, which allows the generated arc to flow effectively toward the arc-extinguishing section 600, by generating a main magnetic field MMF and a secondary magnetic field SMF. A detailed description of this will be provided later.

[0280] 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.

[0281] The support plate 610 forms both sides of the arc-extinguishing part 600, which are the right and left sides in the illustrated embodiment. The support plate 610 is combined with and supports the various components of the arc-extinguishing part 600.

[0282] 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.

[0283] 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 and respectively form the right and left sides of the arc-extinguishing part 600.

[0284] 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.

[0285] The support plate 610 can be formed of a heat-resistant material. This is to prevent damage or deformation caused by the generated electric arc.

[0286] 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, another portion of the through holes can be fitted with a fastening member for securing the grille cover 630 and the arc guide 640 to the support plate 610.

[0287] In the illustrated embodiment, the support plate 610 is formed as a plate shape with a plurality of edges at its apex. The support plate 610 can be configured in any form that forms both sides of the arc-extinguishing part 600 and can support each component of the arc-extinguishing part 600.

[0288] The support plate 610 is combined with the grille 620. Specifically, a portion of the through hole in the support plate 610 is inserted into the grille 620, with insertion protrusions on both sides, specifically the right and left ends, in the illustrated embodiment.

[0289] The support plate 610 is combined with the grille cover 630. Specifically, the grille cover 630 is combined on the upper side of the support plate 610. The combination can be achieved by inserting the support plate 610 and the grille cover 630 together or by using additional fastening members.

[0290] The support plate 610 is coupled to the arc guide 640. Specifically, the arc guide 640 is coupled to the underside of the support plate 610, that is, to the side opposite to the grille cover 630. This coupling can be achieved by additional fastening members.

[0291] 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.

[0292] The grille 620 directs the electric arc generated by the separation of the fixed contact 311 and the movable contact 321 to the arc extinguishing section 600.

[0293] The guidance can be achieved using the magnetic force generated by the grid 620. Alternatively, the guidance can be achieved using an arc-extinguishing magnet 634 disposed in the arc-extinguishing section 600.

[0294] The grid 620 can be formed of a magnetic material. This is to exert an attractive force on the electric arc, which is a flow of electrons.

[0295] A plurality of grilles 620 may be provided. The plurality of grilles 620 may be spaced apart from each other and stacked. In the illustrated embodiment, nine grilles 620 are provided and stacked in the front-to-back direction.

[0296] The number of grilles 620 can be varied. Specifically, the number of grilles 620 can vary depending on the size and performance of the arc-extinguishing section 600 or the rated capacity of the air circuit breaker 10 having the arc-extinguishing section 600.

[0297] The incoming electric arc is divided into smaller streams by the space formed by the plurality of grids 620 spaced apart from each other. Therefore, the pressure of the electric arc can be increased, and the arc movement speed and arc extinguishing speed can be improved.

[0298] The arc flow channel 650 is located at the grid 620 furthest from the fixed contact 311 among the plurality of grids 620, which in the illustrated embodiment is adjacent to the rear grid 620.

[0299] In the illustrated embodiment, the width direction of the grille 620 is such that its left and right ends can protrude downwards towards the fixed contact 311. That is, the grille 620 is formed as a peak shape with its left and right ends pointing downwards.

[0300] As a result, the generated electric arc can effectively travel towards the ends of the grid 620 in the left and right directions, thereby easily flowing towards the arc extinguishing section 600.

[0301] The arc guide 640 is located on the outer side of the left-right end of the grille 620, and on the lower side in the illustrated embodiment.

[0302] The grille 620 is engaged with the support plate 610. Specifically, in the width direction of the grille 620, in the illustrated embodiment, a plurality of engaging protrusions are formed along the left and right edges. These engaging protrusions extend along the extension direction of the grille 620, and in the illustrated embodiment, a plurality of protrusions are formed in the up and down direction. The engaging protrusions of the grille 620 are inserted into through holes formed in the support plate 610.

[0303] In the illustrated embodiment, the upper end of the side of the grille 620 facing the grille cover 630 may 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.

[0304] 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. The electric arc passing through the space formed by the plurality of grilles 620 being spaced apart from each other can be discharged to the outside of the air circuit breaker 10 through the grille cover 630.

[0305] The grille cover 630 is combined with the support plate 610. In the illustrated embodiment, the left and right edges of the grille cover 630 in the width direction may have protrusions that insert into through holes in the support plate 610. Alternatively, the grille cover 630 and the support plate 610 can be combined using additional fastening members.

[0306] The grille cover 630 is formed along a direction, which in the illustrated embodiment is a front-to-back direction. It can be understood that the direction is the same as the stacking direction of the plurality of grilles 620.

[0307] The other direction of the grille cover 630, in the illustrated embodiment, is the length in the width direction, which can be determined based on the length in the width direction of the plurality of grilles 620.

[0308] 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 barrier plate 636.

[0309] The cover body 631 forms the appearance of the grille cover 630. The cover body 631 is combined with the support plate 610. In addition, an upper frame 632 is combined with the cover body 631.

[0310] A defined space is formed inside the cover body 631. This space is covered by an upper frame 632. The space houses a mesh section 633, an arc-extinguishing magnet 634, a magnet cover 635, and a barrier plate 636. Therefore, this space can be referred to as a "receiving space".

[0311] 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 can flow into the receiving space of the cover body 631 through the space formed by the grille 620.

[0312] In the illustrated embodiment, the lower side of the cover body 631 facing the grille 620 can contact the upper end of the grille 620. In one embodiment, the cover body 631 can support the upper end of the grille 620.

[0313] The cover body 631 can be formed of an insulating material. This is to prevent the magnetic field of the path AP used to form the electric arc from being distorted.

[0314] The cover body 631 can be formed of a heat-resistant material. This is to prevent damage or deformation caused by the generated electric arc.

[0315] In the illustrated embodiment, the length of the cover body 631 in the front-to-back direction is greater than its length in the left-to-right direction. The shape of the cover body 631 can vary depending on the shape of the support plate 610 and the shape and number of the grilles 620.

[0316] On the side of the cover body 631 opposite to the grille 620, in the illustrated embodiment, an upper frame 632 is attached to the upper side.

[0317] The upper frame 632 is joined 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 mesh portion 633, arc-extinguishing magnet 634, magnet cover 635 and barrier plate 636 housed in the receiving space.

[0318] In the illustrated embodiment, the length of the upper frame 632 in the front-to-back direction is greater than its length in the left-to-right direction. The upper frame 632 can be formed in any shape that allows it to be stably attached to the upper side of the cover body 631 and to cover and accommodate the receiving space.

[0319] A plurality of through holes are formed in the upper frame 632. Through these through holes, electric arcs that have passed through and been extinguished between the grids 620 can be discharged. In the illustrated embodiment, three through holes are arranged in the left-right direction and three rows in the front-back direction, thus forming a total of nine through holes. The number of through holes can be varied.

[0320] 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 barrier plate 636, which are housed in the space of the cover body 631, from the top.

[0321] Therefore, even if an electric arc occurs, the mesh part 633, the arc-extinguishing magnet 634, the magnet cover 635, and the barrier plate 636 will not arbitrarily detach from the receiving space of the cover body 631.

[0322] The upper frame 632 can be fixedly attached to the upper side of the cover body 631. In the illustrated embodiment, the upper frame 632 is fixedly attached to the upper side of the cover body 631 by fastening members.

[0323] The mesh section 633, the arc-extinguishing magnet 634, the magnet cover 635, and the barrier plate 636 are located between the upper frame 632 and the cover body 631, that is, on the lower side of the upper frame 632, in the receiving space of the cover body 631.

[0324] In other words, in the accommodating space of the cover body 631, a mesh portion 633, an arc-extinguishing magnet 634, a magnet cover 635, and a barrier plate 636 are stacked from top to bottom.

[0325] The mesh section 633 serves to filter out 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 be discharged to the outside after removing the remaining impurities.

[0326] That is, the mesh section 633 functions as a filter.

[0327] The mesh section 633 includes a plurality of through holes. Preferably, the size of the through holes, i.e., the diameter, is smaller than the diameter of the impurity particles remaining in the electric arc. Furthermore, it is preferable that the diameter of the through holes is sufficiently large to allow the gas included in the electric arc to pass through.

[0328] A plurality of mesh sections 633 can be provided. The plurality of mesh sections 633 can be stacked in the vertical direction. As a result, impurities remaining in the electric arc passing through the mesh sections 633 can be effectively removed.

[0329] 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 based on the shape of the accommodating space.

[0330] The mesh section 633 is located on the lower side of the upper frame 632. A plurality of through holes formed in the mesh section 633 communicate with a plurality of through holes formed in the upper frame 632. Thus, an electric arc passing through the mesh section 633 can be discharged to the outside through the upper frame 632.

[0331] The plurality of through holes formed in the grid portion 633 are connected to the space formed by the grille 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.

[0332] The arc-extinguishing magnet 634, the magnet cover 635, and the barrier plate 636 are located on the lower side of the mesh section 633.

[0333] The arc-extinguishing magnet 634 generates a magnetic field, which creates an electromagnetic force to cause the generated electric arc to flow toward the arc-extinguishing part 600. The arc-extinguishing magnet 634 is housed inside the receiving space of the cover body 631.

[0334] The arc-extinguishing magnet 634 is located on the lower side of the mesh portion 633. Additionally, the arc-extinguishing magnet 634 is located on the upper side of the barrier plate 636. In one embodiment, the arc-extinguishing magnet 634 may be mounted on the barrier plate 636.

[0335] The arc-extinguishing magnet 634 can be arranged in any form capable of forming a magnetic field. In one embodiment, the arc-extinguishing magnet 634 can be a permanent magnet or an electromagnet.

[0336] The arc-extinguishing magnet 634 can be formed to a specified size. Specifically, as described later, a plurality of through holes 636a can be formed in the barrier plate 636. Preferably, the arc-extinguishing magnet 634 is formed to a size that does not cover the through holes 636a formed in the barrier plate 636.

[0337] In the illustrated embodiment, the arc-extinguishing magnet 634 is formed in a rectangular shape. The length of the arc-extinguishing magnet 634 is less than half the length of the barrier plate 636 in the front-back direction. In addition, the length of the arc-extinguishing magnet 634 is smaller than the length of the barrier plate 636 in the width direction.

[0338] The arc-extinguishing magnet 634 can be formed in any size and shape without obstructing the through hole 636a. For example, the arc-extinguishing magnet 634 can have a width that is the same as the width of the barrier plate 636.

[0339] 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 on the opposite side of the location in the receiving space of the cover body 631 where a plurality of through holes 636a are formed.

[0340] The arc-extinguishing magnet 634 can be positioned at any location without obstructing the plurality of through holes 636a.

[0341] 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.

[0342] Therefore, the vertical swaying 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 swaying of the arc-extinguishing magnet 634 is limited by the magnet cover 635.

[0343] The arc-extinguishing magnet 634 includes a first surface 634a and a second surface 634b.

[0344] The first surface 634a forms the side of the arc-extinguishing magnet 634 facing the grid portion 633. In other words, the first surface 634a forms the side of the arc-extinguishing magnet 634 opposite to the grid 620. In the illustrated embodiment, the first surface 634a may be defined by the upper side surface of the arc-extinguishing magnet 634.

[0345] The second surface 634b forms the other side of the arc-extinguishing magnet 634 facing the barrier 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 may be defined by the lower surface of the arc-extinguishing magnet 634.

[0346] 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 that face each other.

[0347] The first surface 634a can be magnetized to either the N pole or the S pole. Similarly, the second surface 634b can be magnetized to either the N pole or the S pole. That is, the first surface 634a and the second surface 634b are magnetized to opposite polarities. Thus, a secondary magnetic field SMF can be formed between the first surface 634a and the second surface 634b.

[0348] As described above, the CT magnet portion 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 portion 500.

[0349] A detailed explanation of the process of generating the main magnetic field MMF and the secondary magnetic field SMF using the arc-extinguishing magnet 634 will be provided later.

[0350] The magnet cover 635 supports the arc-extinguishing magnet 634 so that the arc-extinguishing magnet 634 placed on the barrier plate 636 cannot move arbitrarily on the barrier plate 636.

[0351] The magnet cover 635 is located below the mesh portion 633. Additionally, the magnet cover 635 is located above the barrier plate 636. The magnet cover 635 can be mounted on the barrier plate 636.

[0352] As described above, the arc-extinguishing magnet 634 can also be mounted on the barrier plate 636. That is, the magnet cover 635 can be located on the same plane as the arc-extinguishing magnet 634.

[0353] 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.

[0354] In the illustrated embodiment, either the first opening 635a or the second opening 635b of the magnet cover 635 is formed on the rear side, with the first opening 635a communicating with the through hole 636a formed in the barrier plate 636. The electric arc through the through hole 636a can flow through the first opening 635a to the mesh portion 633 via the barrier plate 636.

[0355] 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. In the illustrated embodiment, the second opening 635b is formed on the front side. The edges of the second opening 635b formed on the front side of the magnet cover 635 surround the arc-extinguishing magnet 634.

[0356] The second opening 635b formed on the front side of the magnet cover 635 can be formed in a shape corresponding to the shape of the arc-extinguishing magnet 634. In the illustrated embodiment, the arc-extinguishing magnet 634 can be formed with a rectangular cross-section extending in both the front-back and left-right directions.

[0357] 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.

[0358] With the magnet cover 635, the arc-extinguishing magnet 634 can remain stationary in the front-back or left-right directions while mounted on the barrier plate 636. At the same time, the electric arc passing through the through hole 636a of the barrier plate 636 can flow to the mesh portion 633 through the opening formed in the magnet cover 635.

[0359] 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 barrier plate 636.

[0360] The magnet cover 635 may be formed of an insulating material. This is to prevent the magnetic field generated by the arc-extinguishing magnet 634 from being disturbed or the flowing electric arc from being attracted by the magnet cover 635.

[0361] In one embodiment, the magnet cover 635 may be formed of a material such as reinforced plastic or acrylic.

[0362] The barrier plate 636 is located on the underside of the magnet cover 635.

[0363] The barrier plate 636 supports the arc-extinguishing magnet 634 and the magnet cover 635 on the lower side. Therefore, the arc-extinguishing magnet 634, housed within the internal space of the cover body 631, is not exposed to the generated electric arc. Thus, damage to the arc-extinguishing magnet 634 due to the electric arc can be prevented.

[0364] Additionally, the barrier plate 636 provides a pathway for the electric arc passing through the space formed between the grids 620 to flow toward the mesh portion 633.

[0365] The barrier plate 636 is accommodated in the accommodating space of the cover body 631. In the accommodating space of the cover body 631, the barrier plate 636 is located at the lowermost side.

[0366] In the illustrated embodiment, the barrier plate 636 is formed with a rectangular cross-section having a length in the front-to-back direction greater than its length in the left-to-right direction. The shape of the barrier plate 636 can vary depending on the cross-sectional shape of the receiving space of the cover body 631.

[0367] The grille 620 is located below the barrier plate 636. In one embodiment, the upper end of the grille 620, i.e., the end of the grille 620 facing the barrier plate 636, may contact the barrier plate 636.

[0368] The barrier plate 636 includes a through hole 636a.

[0369] 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 through the barrier plate 636 in a vertical direction, and in the illustrated embodiment, it is formed vertically.

[0370] A plurality of through holes 636a can be formed. The plurality of through holes 636a can be arranged spaced apart from each other.

[0371] The through-hole 636a can be located off-center in the barrier plate 636. In the illustrated embodiment, the through-hole 636a is located on the opposite side of the arc-extinguishing magnet 634, i.e., the rear side of the barrier plate 636.

[0372] The through hole 636a is not blocked by the arc-extinguishing magnet 634 and can be configured at any position that allows it to communicate with the first opening 635a formed in the magnet cover 635. The through hole 636a communicates with the first opening 635a.

[0373] The arc guide 640 guides the generated arc to flow toward the grid 620. The arc guide 640 prevents the generated arc from flowing toward the support plate 610 and causing damage to the support plate 610.

[0374] 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.

[0375] A plurality of arc guides 640 may be provided. The plurality of arc guides 640 may be coupled to various support plates 610. In the illustrated embodiment, two arc guides 640 are provided, each coupled to a respective support plate 610. The two arc guides 640 are configured to face each other.

[0376] The arc guide 640 is coupled to the support plate 610. This coupling can be achieved by additional fastening components.

[0377] The arc guide 640 may 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 may be formed of a ceramic material.

[0378] The arc guide 640 is configured to surround both sides of the grille 620, and in the illustrated embodiment, it is part of the pointed portion at the left and right ends. Thus, the arc guided by the arc guide 640 will not concentrate in any part of the grille 620.

[0379] The arc guide 640 can extend along the extension direction of the support plate 610, which is in 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.

[0380] The arc guide 640 includes a first extension 641 and a second extension 642.

[0381] 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 310, which is the lower side in the illustrated embodiment. The first extension 641 can be joined to the support plate 610 by means of a fastening member.

[0382] The first extension 641 extends upward toward the grille 620, and in the illustrated embodiment, it extends upward. 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.

[0383] The second extension 642 extends from the end of the first extension 641.

[0384] The second extension 642 is formed as part of a pointed portion 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.

[0385] In another embodiment, the second extension 642 may extend parallel to the pointed portion formed at the left-right end of the grille 620.

[0386] The arc flow channel 650 guides the generated arc towards the grille 620. The arc guide 640 prevents the generated arc from crossing the grille 620 and traveling towards one side wall of the cover 100. This prevents damage to the cover 100 caused by the generated arc.

[0387] 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.

[0388] 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 support plate 610, thus opposite to the fixed contact 311 located on the front side of the support plate 610.

[0389] The arc flow channel 650 is combined with the support plate 610. The combination can be achieved 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.

[0390] The arc flow channel 650 can be formed of a conductive material. This is to effectively guide the arc by applying an attractive force to the flowing arc. In one embodiment, the arc flow channel 650 can be formed of copper, iron, or an alloy comprising them.

[0391] The arc flow channel 650 extends toward the grille 620 by a predetermined length. In one embodiment, the arc flow channel 650 may be configured to cover the grille 620 furthest from the fixed contact 311 on the rear side, which is the grille 620 on the rearmost side in the illustrated embodiment.

[0392] Therefore, the electric arc cannot 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 guided towards the grille 620.

[0393] 6. Description of the arc-extinguishing part 700 according to another embodiment of the present invention

[0394] Reference Figures 19 to 30 In another embodiment of the present invention, the air circuit breaker 10 includes an arc-extinguishing section 700.

[0395] The arc-extinguishing section 700 is configured to extinguish the electric arc generated by the separation of the fixed contact 311 and the movable contact 321. The generated electric arc can pass through the arc-extinguishing section 700 and be extinguished and cooled, and then discharged to the outside of the air circuit breaker 10.

[0396] 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.

[0397] A portion of the arc-extinguishing part 700 is 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, a portion of the arc-extinguishing part 700 is housed on the upper side of the upper cover 110.

[0398] The above configuration can be varied depending on the positions of the fixed contact 311 and the movable contact 312. That is, the arc extinguishing part 700 can be located near the fixed contact 311 and the movable contact 312. Therefore, an arc extending along the movable contact 312, which rotates away from the fixed contact 311, can easily enter the arc extinguishing part 700.

[0399] A plurality of arc-extinguishing sections 700 may be provided. The plurality of arc-extinguishing sections 700 may be physically separated from each other or electrically isolated. In the illustrated embodiment, three arc-extinguishing sections 700 are provided. This is similar to the aforementioned situation because three-phase current flows in the air circuit breaker 10 of the embodiment of the present invention.

[0400] 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 adjacent to the upper side of each fixed contact 311 and movable contact 321.

[0401] It is understandable that each arc-extinguishing section 700 is configured to extinguish the electric arc generated by the interruption of the current in each phase flowing in each disconnection section 300.

[0402] The arc-extinguishing sections 700 can be configured to be adjacent to each other. In the illustrated embodiment, three arc-extinguishing sections 700 are arranged side by side along the left-right direction of the air circuit breaker 10.

[0403] In this embodiment, the arc-extinguishing section 700 includes a first arc-extinguishing magnet section to a third arc-extinguishing magnet section 771, 772, and 773. The first to third arc-extinguishing magnet sections 771, 772, and 773 form a main magnetic field MMF and a secondary magnetic field SMF to create an arc path AP that allows the generated arc to flow effectively toward the arc-extinguishing section 700. A detailed explanation of this will follow.

[0404] 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.

[0405] The support plate 710 forms both sides of the arc-extinguishing part 700, which are 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 the components.

[0406] 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.

[0407] A plurality of support plates 710 are provided. The plurality of support plates 710 can be configured to be spaced apart from each other and opposite each other. In the illustrated embodiment, two support plates 710 are provided, and they respectively form the right and left sides of the arc-extinguishing part 700.

[0408] 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.

[0409] The support plate 710 can be formed of a heat-resistant material. This is to prevent damage or deformation caused by the generated electric arc.

[0410] A plurality of through holes are formed in the support plate 710. The grille 720 and the arc flow channel 750 can be inserted into a portion of the through holes.

[0411] 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.

[0412] Furthermore, a portion of the through hole may be fitted with fastening members 762c and 763c for securing the second arc-extinguishing magnet 772 to the third arc-extinguishing magnet 773 to the support plate 710.

[0413] In the illustrated embodiment, the support plate 710 is plate-shaped with a plurality of angles formed at its apex. The support plate 710 can be configured in any form that can form both sides of the arc-extinguishing part 700 and support each component of the arc-extinguishing part 700.

[0414] The support plate 710 is combined with the grille 720. Specifically, insertion protrusions are provided on both sides of the grille 720, specifically on the right and left ends in the illustrated embodiment, and are inserted into a portion of the through holes of the support plate 710.

[0415] The support plate 710 is coupled to the grille cover 730. Specifically, the grille cover 730 is coupled to the upper side of the support plate 710. The coupling can be achieved by inserting the support plate 710 and the grille cover 730 together or by using additional fastening members.

[0416] The support plate 710 is coupled to the arc guide 740. Specifically, the arc guide 740 is coupled to the underside of the support plate 710, that is, to the side opposite to the grille cover 730. This coupling can be achieved by additional fastening members.

[0417] 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.

[0418] The support plate 710 is combined with the magnet housing 760. Specifically, the support plate 710 can be combined with the second receiving portion 762 and the third receiving portion 763 of the magnet housing 760 through the second fastening member 762c and the third fastening member 763c.

[0419] The grille 720 directs the electric arc generated by the separation of the fixed contact 311 and the movable contact 321 to the arc extinguishing section 700.

[0420] The guidance can be achieved by the magnetic force generated by the grid 720. Alternatively, the guidance can be achieved by the arc-extinguishing magnet 770 disposed in the arc-extinguishing section 700.

[0421] The grid 720 can be formed from a magnetic material. This is to exert an attractive force on the electric arc, which is a flow of electrons.

[0422] A plurality of grilles 720 may be provided. The plurality of grilles 720 may be spaced apart from each other and stacked. In the illustrated embodiment, ten grilles 720 are provided and stacked in the front-to-back direction.

[0423] The incoming electric arc is divided into smaller, flowing portions by the space formed by the multiple grids 720 spaced apart from each other. This increases the arc pressure, the arc's movement speed, and the arc extinguishing speed.

[0424] The arc flow channel 750 is located at the grid 720 furthest from the fixed contact 311 among the plurality of grids 720, which in the illustrated embodiment is adjacent to the rear grid 720.

[0425] In the illustrated embodiment, the width direction of the grille 720 is such that its left and right ends can protrude downwards towards the fixed contact 311. That is, the grille 720 can be formed as a peak shape with its left and right ends pointing downwards.

[0426] As a result, the generated electric arc can travel effectively toward the ends of the grid 720 in the left and right directions, thereby easily flowing toward the arc extinguishing section 700.

[0427] The arc guide 740 is located on the outer side of the left-right end of the grille 720, and on the lower side in the illustrated embodiment.

[0428] The grille 720 is engaged with the support plate 710. Specifically, in the illustrated embodiment, the width direction of the grille 720 has a plurality of engaging protrusions formed along its left and right edges. These engaging protrusions are also formed vertically along the extension direction of the grille 720. The engaging protrusions of the grille 720 are inserted into through holes formed in the support plate 710.

[0429] A portion of the plurality of grilles 720 is inserted into the grille joint 764 of the magnet housing 760.

[0430] Specifically, in the illustrated embodiment, one side of a portion of the grids 720, at the lower end, is inserted into a grid joint 764 that is coupled to the magnet housing 760.

[0431] As described above, since the grille 720 is located above the fixed contact 311, it can also be said that a portion of the grille 720 is inserted into the grille joint 764 on the side facing the fixed contact 311.

[0432] One or more of the plurality of grilles 720 may be combined with a magnet housing 760, which houses an arc-extinguishing magnet portion 770 for forming an arc path. Specifically, the lower end of one or more of the plurality of grilles 720 may be inserted into a grille joint portion 764 formed in the magnet housing 760.

[0433] In the illustrated embodiment, the lower ends of the two grilles 720 located in the center in the front-rear direction, namely the fifth and sixth grilles 720 starting from the front side, are inserted into and joined to the grille joint 764.

[0434] In addition, on both sides of the two grilles 720, in the illustrated embodiment, a second receiving portion 762 and a third receiving portion 763 are combined on the left and right sides.

[0435] That is, in the illustrated embodiment, a second receiving portion 762 is joined to the left side between the two central grilles 720 located in the front-rear direction, i.e., between the fifth and sixth grilles 720 starting from the front side. Additionally, a third receiving portion 763 is joined to the right side between the two grilles 720.

[0436] In the illustrated embodiment, the upper end of the side of the grille 720 facing the grille cover 730 may be located adjacent to the grille cover 730. The electric arc flowing along the grille 720 can be discharged to the outside through the grille cover 730.

[0437] The grille cover 730 forms the upper side of the arc-extinguishing section 700. The grille cover 730 is configured to cover the upper end of the grille 720. The electric arc passing through the space formed by the plurality of grilles 720 separated from each other can be discharged to the outside of the air circuit breaker 10 through the grille cover 730.

[0438] The grille cover 730 is combined with the support plate 710. In the width direction of the grille cover 730, specifically the left-right edge in the illustrated embodiment, protrusions may be formed on the edges that allow through-holes to be inserted into the support plate 710. Alternatively, the grille cover 730 and the support plate 710 can be combined using additional fastening components.

[0439] The grille cover 730 faces one direction, which in the illustrated embodiment extends in a front-to-back direction. It can be understood that this direction is the same as the stacking direction of the plurality of grilles 720.

[0440] The length of the grille cover 730 in the width direction, as shown in the illustrated embodiment, can be determined based on the width direction length of the plurality of grilles 720.

[0441] In the illustrated embodiment, the grille cover 730 includes a cover body 731, an upper frame 732, and a mesh portion 733.

[0442] The cover body 731 forms the appearance 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.

[0443] A defined space is formed inside the cover body 731. This space can be covered by the upper frame 732. A grid section 733 is accommodated in this space. Here, this space can be referred to as the "accommodation space".

[0444] The receiving space is connected to the space formed by the separation of the grille 720. As a result, the receiving space is connected to the internal space of the cover 100. Thus, the generated electric arc can flow into the receiving space of the cover body 731 through the space formed by the separation of the grille 720.

[0445] In the illustrated embodiment, the lower side of the cover body 731 facing the grille 720 may contact the upper end of the grille 720. In one embodiment, the cover body 731 may support the upper end of the grille 720.

[0446] The cover body 731 can be formed of an insulating material. This is to prevent the magnetic field of the path AP used to form the electric arc from being distorted.

[0447] The cover body 731 can be formed of a heat-resistant material. This is to prevent damage or deformation caused by the generated electric arc.

[0448] In the illustrated embodiment, the length of the cover body 731 in the front-to-back direction is greater than its length in the left-to-right direction. The shape of the cover body 731 can vary depending on the shape of the support plate 710 and the shape and number of the grilles 720.

[0449] On the side of the cover body 731 opposite to the grille 720, in the illustrated embodiment, an upper frame 732 is attached to the upper side.

[0450] 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.

[0451] In the illustrated embodiment, the length of the upper frame 732 in the front-to-back direction is greater than its length in the left-to-right direction. The upper frame 732 can be formed in any shape that is stably attached to the upper side of the cover body 731 and can cover the receiving space and the configuration contained within the receiving space.

[0452] A plurality of through holes are formed in the upper frame 732. Through these through holes, electric arcs that have passed between the grids 720 and been extinguished can be discharged. In the illustrated embodiment, three through holes are formed in the left-right direction and three rows in the front-back direction, resulting in a total of nine through holes. The number of through holes can vary.

[0453] The through holes are located at positions spaced apart from each other. A rib is formed between the through holes. The rib can press against the mesh portion 733 in the space accommodated in the cover body 731 from above.

[0454] Therefore, even if an electric arc is generated, the mesh portion 733 will not arbitrarily detach from the receiving space of the cover body 731.

[0455] 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 can be fixedly attached to the upper side of the cover body 731 by fastening members.

[0456] The mesh portion 733 is located between the upper frame 732 and the cover body 731, that is, on the lower side of the upper frame 732 in the receiving space of the cover body 731.

[0457] The mesh section 733 serves to filter out impurities remaining in 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 remaining impurities have been removed.

[0458] That is, the mesh section 733 functions as a filter.

[0459] The mesh section 733 includes a plurality of through holes. Preferably, the size of the through holes, i.e., the diameter, can be smaller than the diameter of the impurity particles remaining in the electric arc. Additionally, preferably, the diameter of the through holes is large enough to allow the gas included in the electric arc to pass through.

[0460] Multiple mesh sections 733 can be provided. These multiple mesh sections 733 can be stacked vertically. This effectively removes impurities remaining in the electric arc passing through the mesh sections 733.

[0461] 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 based on the shape of the accommodating space.

[0462] The mesh section 733 is located on the lower side of the upper frame 732. A plurality of through holes formed in the mesh section 733 communicate with a plurality of through holes formed in the upper frame 732. Thus, an electric arc passing through the mesh section 733 can be discharged to the outside via the upper frame 732.

[0463] 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.

[0464] Although not shown, the barrier plate (not shown) can be located below the grid section 733. A plurality of through holes (not shown) are formed in the barrier plate (not shown), thereby allowing communication between the interior space of the cover section 100 and the grid section 733.

[0465] The arc guide 740 guides the generated arc to flow toward the grid 720. The arc guide 740 prevents the generated arc from flowing toward the support plate 710 and causing damage to the support plate 710.

[0466] 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.

[0467] A plurality of arc guides 740 are provided. The plurality of arc guides 740 can be coupled to various support plates 710. In the illustrated embodiment, two arc guides 740 are provided, each coupled to a specific support plate 710. The two arc guides 740 are configured to face each other.

[0468] The arc guide 740 is coupled to the support plate 710. This coupling can be achieved through additional fastening components.

[0469] 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.

[0470] The arc guide 740 is configured to surround both sides of the grille 720, and in the illustrated embodiment, it is part of the pointed portion at the left-right end. Thus, the arc guided by the arc guide 740 will not concentrate on any part of the grille 720.

[0471] The arc guide 740 can extend along the extension direction of the support plate 710, which is in the front-rear direction in the illustrated embodiment. That is, the arc guide 740 can extend between the frontmost grille 720 and the rearmost grille 720.

[0472] The arc guide 740 includes a first extension 741 and a second extension 742.

[0473] The first extension 741 is the portion where the arc guide 740 is joined to the support plate 710. The first extension 741 is located on the side of the support plate 710 facing the fixed contact 310, which is the lower side in the illustrated embodiment. The first extension 741 can be joined to the support plate 710 by a fastening member.

[0474] The first extension 741 extends upward toward the grille 720, and in the illustrated embodiment, it extends upward. 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.

[0475] The second extension 742 extends from the end of the first extension 741.

[0476] The second extension 742 is formed as part of the pointed portion surrounding the left and right ends 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.

[0477] In another embodiment, the second extension 742 may extend parallel to the pointed portion formed at the left-right end of the grille 720.

[0478] The arc flow channel 750 guides the generated arc towards the grille 720. The arc guide 740 prevents the generated arc from crossing the grille 720 and traveling towards one side wall of the cover 100. This prevents damage to the cover 100 caused by the generated arc.

[0479] 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.

[0480] 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, thus opposite to the fixed contact 311 located on the front side of the support plate 710.

[0481] The arc flow channel 750 is combined with the support plate 710. The combination can be achieved 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.

[0482] The arc flow channel 750 can be formed of a conductive material. This is to effectively guide the arc by applying an attractive force to the flowing arc. In one embodiment, the arc flow channel 750 can be formed of copper, iron, or an alloy comprising them.

[0483] The arc flow channel 750 extends toward the grille 720 by a predetermined length. In one embodiment, the arc flow channel 750 may be configured to cover the grille 720 located furthest from the fixed contact 311 on the rear side, which is the grille 720 located on the rearmost side in the illustrated embodiment.

[0484] Therefore, the electric arc will not extend beyond the rearmost grille 720, thus preventing damage to the cover 100. Furthermore, the generated electric arc can be effectively guided towards the grille 720.

[0485] The magnet housing 760 houses the arc-extinguishing magnet section 770, which forms a main magnetic field MMF and a secondary magnetic field SMF in the arc-extinguishing section 700.

[0486] In addition, the magnet housing 760 can be combined with the support plate 710 or the grid 720, thereby enabling the arc-extinguishing magnet part 770 to be stably combined with the arc-extinguishing part 700.

[0487] The magnet housing 760 extends in one direction, which is left-right in the illustrated embodiment. The length of the magnet housing 760 can be determined based on the length of the grille 720 extending in the width direction, i.e., the left-right direction.

[0488] In one embodiment, the magnet housing 760 may extend such that one end and the other end of its extending direction respectively contact each of the opposing support plates 710. That is, the magnet housing 760 extends between the opposing support plates 710.

[0489] The magnet housing 760 can be formed of an insulating material. This is to prevent magnetic interference from the main magnetic field MMF and the secondary magnetic field SMF generated by the arc-extinguishing magnet section 770.

[0490] 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.

[0491] In one embodiment, the magnet housing 760 may be formed of synthetic resin or reinforced plastic.

[0492] 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.

[0493] The first receiving section 761 receives the first arc-extinguishing magnet 771 of the arc-extinguishing magnet section 770.

[0494] The first receiving portion 761 is formed on one side of the magnet housing 760, which is the lower side in the illustrated embodiment. In other words, the first receiving portion 761 is formed on the side of the magnet housing 760 facing the fixed contact 311.

[0495] The first receiving portion 761 protrudes downwards in the illustrated embodiment, pointing away from the grille 720. 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 further away from the fixed contact 311 than the lower end of the support plate 710.

[0496] The first receiving portion 761 may be located in the extending direction of the magnet housing 760, and in the illustrated embodiment, it is the central portion in the left-right direction. In other words, the first receiving portion 761 may be located between the second receiving portion 762 and the third receiving portion 763.

[0497] 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, which is the lower side in the illustrated embodiment.

[0498] On the side of the first receiving portion 761 facing the grille 720, a grille joining portion 764 is formed on the upper side in the illustrated embodiment. Additionally, on both sides of the first receiving portion 761, arc inflow portions 765 are formed on the right and left sides in the illustrated embodiment.

[0499] 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.

[0500] 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 formed on the side opposite to the arc flow channel 750 of the first receiving section 761, and in the illustrated embodiment, it is formed as a recess on the front side.

[0501] 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 at any position that can form a space through the recess of the rear side or lower side of the first receiving part 761.

[0502] An opening is formed on one side of the first receiving groove 761a, in the illustrated embodiment, on the front side. The first arc-extinguishing magnet 771 can be received into the first receiving groove 761a through the opening.

[0503] As described above, the first receiving groove 761a can be formed at other locations of the first receiving portion 761. In this case, an opening is formed on the outer side of the first receiving groove 761a, which functions 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 vary depending on the shape of the first arc-extinguishing magnet 771.

[0504] After the first arc-extinguishing magnet 771 is housed 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 housed in the first receiving groove 761a from shaking or arbitrarily detaching.

[0505] 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.

[0506] The first fastening hole 761b is located adjacent to the first receiving groove 761a. In the illustrated embodiment, two first fastening holes 761b are provided, with each first fastening hole 761b located on the right and left sides of the first receiving groove 761a, respectively.

[0507] The number and position of the first fastening hole 761b can vary depending on the number and position of the fastening holes formed in the cover portion 761d.

[0508] The first fastening member 761c fastens the first receiving part 761 and the cover part 761d.

[0509] 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.

[0510] The first fastening member 761c can be configured in any form capable of fastening two or more members. In one embodiment, the first fastening member 761c can be a screw member or a rivet member, etc.

[0511] A plurality of first fastening members 761c may be provided. In the illustrated embodiment, two first fastening members 761c are provided. The number of first fastening members 761c can be determined based on 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.

[0512] The cover portion 761d is combined 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 shaking or falling off.

[0513] The cover portion 761d may be formed in a shape corresponding to the first receiving portion 761. In one embodiment, the cross-sectional shape of the cover portion 761d may be the same as the cross-sectional shape of the first receiving portion 761.

[0514] 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 each of the upper and lower edges serving as the bottom and top edges, but their shapes can be changed.

[0515] 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 connected.

[0516] Multiple through holes can be formed. The multiple 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 each cover portion 761d.

[0517] The number and position of through holes can vary depending on the number and position of the first fastening holes 761b of the first receiving part 761.

[0518] The second receiving portion 762 is located on one side of the first receiving portion 761, which is on the left side in the illustrated embodiment. The first receiving portion 761 and the second receiving portion 762 are continuous.

[0519] The second receiving section 762 receives the second arc-extinguishing magnet 772 of the arc-extinguishing magnet section 770.

[0520] The second receiving portion 762 forms on the other side of the magnet housing 760, which is the left side in the illustrated embodiment. In other words, the second receiving portion 762 is located on either of the opposing support plates 710, which is located adjacent to the left support plate 710 in the illustrated embodiment.

[0521] The second receiving portion 762 is located on one side of the first receiving portion 761, which is the left side in the illustrated embodiment. The second receiving portion 762 extends in a direction away from the first receiving portion 761.

[0522] 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.

[0523] 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.

[0524] The second receiving portion 762 may be located on one side of the grille 720. Specifically, the second receiving portion 762 is located on the side of the grille 720 facing the support plate 710 on the left side, that is, on the left side in the illustrated embodiment.

[0525] 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.

[0526] The second receiving portion 762 includes a second receiving groove 762a, a second fastening hole 762b, and a second fastening member 762c.

[0527] The second receiving groove 762a is a space for accommodating the second arc-extinguishing magnet 772 of the arc-extinguishing magnet section 770. In the illustrated embodiment, the second receiving groove 762a is formed by a recess on the left side surface of the end face of the second receiving section 762.

[0528] In other words, the second receiving groove 762a is formed on the side of the second receiving portion 762 facing the support plate 710, and in the illustrated embodiment, it is recessed on the left side.

[0529] On one side of the second receiving groove 762a, in the illustrated embodiment, an opening is formed on the left side. The second arc-extinguishing magnet 772 can be received into the second receiving groove 762a through the opening.

[0530] 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 vary depending on the shape of the second arc-extinguishing magnet 772.

[0531] 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 arbitrarily dislodging.

[0532] 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.

[0533] 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.

[0534] The number and position of the second fastening hole 762b can vary depending on the number and position of the fastening holes formed in the support plate 710.

[0535] The second fastening member 762c fastens the second receiving part 762 and the support plate 710.

[0536] The second fastening member 762c is inserted through and connected to the support plate 710. Additionally, the second fastening member 762c is inserted into or through the second receiving portion 762. This allows for a stable connection between the second receiving portion 762 and the support plate 710.

[0537] The second fastening member 762c can be configured in any form capable of fastening two or more members. In one embodiment, the second fastening member 762c can be a screw member or a rivet member, etc.

[0538] A plurality of second fastening members 762c may be provided. In the illustrated embodiment, two second fastening members 762c are provided. The number of second fastening members 762c can be determined based on 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.

[0539] The third receiving section 763 receives the third arc-extinguishing magnet 773 of the arc-extinguishing magnet section 770.

[0540] The third receiving portion 763 forms on the other side of the magnet housing 760, which is the right side in the illustrated embodiment. In other words, the third receiving portion 763 is located on the other of the opposing support plates 710, which is located adjacent to the right support plate 710 in the illustrated embodiment.

[0541] The third receiving portion 763 is located on the other side of the first receiving portion 761, which is the right side in the illustrated embodiment. The third receiving portion 763 extends in a direction away from the first receiving portion 761.

[0542] 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.

[0543] 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.

[0544] The third receiving portion 763 may be located on one side of the grille 720. Specifically, the third receiving portion 763 is located on the right side of the support plate 710 of the grille 720, i.e., on the right side in the illustrated embodiment.

[0545] 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.

[0546] The third receiving portion 763 includes a third receiving groove 763a, a third fastening hole 763b, and a third fastening member 763c.

[0547] The third receiving groove 763a is a space for accommodating the third arc-extinguishing magnet 773 of the arc-extinguishing magnet section 770. In the illustrated embodiment, the third receiving groove 763a is formed by a recess on the right side surface of the end face of the third receiving section 763.

[0548] In other words, the third receiving groove 763a is formed on the side of the third receiving portion 763 facing the support plate 710, and in the illustrated embodiment, it is formed as a recess on the right side.

[0549] On one side of the third receiving groove 763a, in the illustrated embodiment, an opening is formed on the right side. The third arc-extinguishing magnet 773 can be received into the third receiving groove 763a through the opening.

[0550] 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 vary depending on the shape of the third arc-extinguishing magnet 773.

[0551] 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 arbitrarily detaching.

[0552] 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.

[0553] 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.

[0554] The number and position of the third fastening hole 763b can vary depending on the number and position of the fastening holes formed in the support plate 710.

[0555] The third fastening member 763c fastens the third receiving part 763 and the support plate 710.

[0556] 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 through the third receiving portion 763. This allows for a stable connection between the third receiving portion 763 and the support plate 710.

[0557] The third fastening member 763c can be configured in any form capable of fastening two or more members. In one embodiment, the third fastening member 763c can be a screw member or a rivet member, etc.

[0558] A plurality of third fastening members 763c may be provided. In the illustrated embodiment, two third fastening members 763c are provided. 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.

[0559] Based on the vertical direction, the first receiving part 761, the second receiving part 762, and the third receiving part 763 can be located at a specified height.

[0560] Specifically, the first receiving portion 761 may be located at a lower position than the second receiving portion 762 and the third receiving portion 763.

[0561] That is, the distance between the first receiving portion 761 and the grille cover 730 can be greater 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.

[0562] In other words, the distance between the first receiving portion 761 and the fixed contact 311 can be less 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.

[0563] In addition, the second receiving part 762 and the third receiving part 763 can be located at the same height in the vertical direction.

[0564] That is, the distance between the second receiving portion 762 and the grille cover 730 can 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.

[0565] In other words, the distance between the second receiving portion 762 and the fixed contact 311 can 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.

[0566] Therefore, the electric arc generated and extended at the fixed contact 311 can be directed to the arc-extinguishing part 700 by the magnetic field formed by the first arc-extinguishing magnet 771 housed in the first receiving part 761.

[0567] In addition, the guided electric arc can be guided by the magnetic field formed by the second arc-extinguishing magnet 772 and the third arc-extinguishing magnet 773 contained in the second and third receiving portions 762 and 763, thereby passing through the grid 720 and being extinguished.

[0568] The grille joint 764 is the part where the magnet housing 760 and the grille 720 are joined. Specifically, the grille 720 can be inserted into and joined to the grille joint 764.

[0569] The grille joint 764 is recessed on the other side of the magnet housing 760. Specifically, the grille joint 764 is recessed on the upper side of the magnet housing 760 opposite to the side where the first receiving portion 761 is formed, in the illustrated embodiment.

[0570] The grille joint 764 is recessed to a predetermined length. Preferably, the grille joint 764 is recessed sufficiently to accommodate a portion of the lower side of the grille 720.

[0571] 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 is formed by extending in a left-right direction. It can be understood that the extending direction of the grille joint 764 is the same as the extending direction of the grille 720 between the respective support plates 710.

[0572] The grille joint 764 extends to a predetermined length. In the illustrated embodiment, the left end of the grille joint 764 is 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 adjacent to the right end of the arc inflow portion 765 formed on the right side in the left-right direction.

[0573] Preferably, the extension length of the grille joint 764 is such that it can accommodate the grille 720 on the side facing the fixed contact 311, which in the illustrated embodiment is a portion of the lower side.

[0574] The interior of the grille joint 764 may have a step. In the illustrated embodiment, each end of the grille joint 764 in the left-right direction, which is the direction in which the grille joint 764 extends, may be recessed by a length less than the remaining portion. In one embodiment, the ends of the grille joint 764 may be formed to penetrate through the magnet housing 760 in the vertical direction.

[0575] 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.

[0576] At this time, the shape of the grille 720 that is coupled with the grille joint 764 can be different from the shape of other grilles 720 that are not coupled with the grille joint 764.

[0577] As an example, the length of the grille 720 that is coupled with the grille joint 764, that is, the length in the vertical direction, can be less than the length of other grilles 720 that are not coupled with the grille joint 764.

[0578] In addition, the width of the end of the grille 720 that is coupled with the grille joint 764, that is, the length in the left and right direction, can be smaller than the width of the end of other grilles 720 that are not coupled with the grille joint 764.

[0579] At this time, the width of the portion of the grille 720 that is coupled with the grille joint 764 and coupled with the support plate 710 can be the same as the width of the portion of the other grille 720 that is not coupled with the grille joint 764 and coupled with the support plate 710.

[0580] That is, if the shape of the grid 720 that is combined with the magnet housing 760 is the same as the shape of the other grids 720 that are not combined with the magnet housing 760, the structure of the arc extinguishing part 700 needs to be significantly changed in order to install the magnet housing 760.

[0581] Therefore, the arc-extinguishing part 700 of 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.

[0582] 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.

[0583] A plurality of grille joints 764 may be provided. The plurality of grille joints 764 may be spaced apart from each other.

[0584] In the illustrated embodiment, two grille joints 764 are formed, including: 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.

[0585] Each grille joint 764a, 764b is located on the side of the magnet housing 760 facing the grille 720, and in the illustrated embodiment, the upper side is spaced apart from each other in the front-rear direction.

[0586] Each grille joint 764 may have a different grille 720 inserted underneath it. In the illustrated embodiment, the first grille joint 764a located on the front side has a grille 720 inserted and joined on the fifth grille 720, starting from the front side. Additionally, the second grille joint 764b located on the rear side has a grille 720 inserted and joined on the rear side, positioned adjacent to the rear side of the grille 720.

[0587] It is understood that the grille 720 inserted into the second grille joint 764b is configured as the sixth grille 720 starting from the front side.

[0588] The arc inflow section 765 forms a passage for the arc flowing in the arc extinguishing section 700 to flow toward the grid 720.

[0589] Specifically, the arc path AP is formed by the main magnetic field MMF and the secondary magnetic field SMF formed 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.

[0590] At this point, in the illustrated embodiment, the width direction of the grille 720 is such that its ends in the right and left directions are pointed. Therefore, the electric arc in the flow can travel towards both ends of the grille 720.

[0591] 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 grid 720 into which the magnet housing 760 is inserted.

[0592] Here, the arc inflow section 765 functions as a passageway that allows the incoming arc to flow toward another grid 720 adjacent to the grid 720 inserted into the magnet housing 760.

[0593] That is, in the illustrated embodiment, the arc inflow portion 765 can guide the incoming arc to flow toward another grid 720 adjacent to the front or rear side of the grid 720 inserted into the magnet housing 760.

[0594] The arc inflow portion 765 is formed in a lower recess on the side of the magnet housing 760 facing the fixed contact 311, in the illustrated embodiment. In one embodiment, the arc inflow portion 765 may be formed in a recess on the side passing through the lower end of the first receiving portion 761.

[0595] 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.

[0596] The extension length of the arc inflow section 765 can be configured to allow the flowing arc to flow toward the adjacent grid 720.

[0597] A plurality of arc inflow portions 765 may be formed. The plurality of arc inflow portions 765 may be disposed on both sides of the first receiving portion 761. In one embodiment, the plurality of arc inflow portions 765 may be disposed to surround both sides of the first receiving portion 761.

[0598] In the illustrated embodiment, the arc inflow portion 765 is formed on both sides of the magnet housing 760, that is, surrounding the first receiving portion 761 on the right and left sides.

[0599] Thus, the electric arc flowing into the grid 720, which is incorporating the magnet housing 760, can flow into the adjacent grid 720 through the electric arc inflow portion 765.

[0600] Therefore, the generated electric arc can be effectively extinguished and passed through the arc-extinguishing section 700.

[0601] The arc-extinguishing magnet section 770 forms a magnetic field for forming the path AP of the electric arc. The electric 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, the path AP of the electric arc is formed, causing the generated electric arc to travel in a predetermined direction.

[0602] 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 and dust contained in the arc.

[0603] The arc-extinguishing magnet 770 can be arranged in any form capable of forming a magnetic field. In one embodiment, the arc-extinguishing magnet 770 can be a permanent magnet or an electromagnet.

[0604] A plurality of arc-extinguishing magnet sections 770 may be provided. The plurality of arc-extinguishing magnet sections 770 can form a main magnetic field MMF as a magnetic field generated between each other. In addition, the plurality of arc-extinguishing magnet sections 770 can form a secondary magnetic field SMF as a magnetic field generated by each arc-extinguishing magnet section 770.

[0605] In the illustrated embodiment, three arc-extinguishing magnet sections 770 are provided, including a first arc-extinguishing magnet 771, a second arc-extinguishing magnet 772, and a third arc-extinguishing magnet 773. The number of arc-extinguishing magnet sections 770 can be varied.

[0606] The first arc-extinguishing magnet 771 forms a magnetic field for forming the path AP of the electric arc.

[0607] The first arc-extinguishing magnet 771 can generate a secondary 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 form a primary magnetic field MMF.

[0608] The first arc-extinguishing magnet 771 can be in a predetermined shape. In the illustrated embodiment, the first arc-extinguishing magnet 771 is formed as a rectangular cross-section with a length in the left-right direction greater than the length in the up-down direction.

[0609] The first arc-extinguishing magnet 771 can be formed in any shape that can be accommodated in the first receiving groove 761a and 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.

[0610] 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.

[0611] The first arc-extinguishing magnet 771 includes a first surface 771a and a second surface 771b.

[0612] The first surface 771a forms the 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 may be defined by the upper side surface of the first arc-extinguishing magnet 771.

[0613] The second surface 771b forms the other side of the first arc-extinguishing magnet 771 facing the fixed contact 311. 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 may be defined by the lower side surface of the first arc-extinguishing magnet 771.

[0614] 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 that face each other.

[0615] The first surface 771a can be magnetized to either an N pole or a S pole. Similarly, the second surface 771b can be magnetized to either an N pole or a S pole. That is, the first surface 771a and the second surface 771b are magnetized to opposite polarities. This creates a secondary magnetic field (SMF) between the first surface 771a and the second surface 771b.

[0616] The second arc-extinguishing magnet 772 forms a magnetic field for the path AP used to form an electric arc.

[0617] The second arc-extinguishing magnet 772 can generate a secondary magnetic field SMF on its own. In addition, the second arc-extinguishing magnet 772, together with the first arc-extinguishing magnet 771 and the third arc-extinguishing magnet 773, can form a primary magnetic field MMF.

[0618] The second arc-extinguishing magnet 772 can be in a predetermined shape. In the illustrated embodiment, the second arc-extinguishing magnet 772 is formed as a rectangular cross-section with a length in the front-to-back direction greater than its length in the vertical direction.

[0619] The second arc-extinguishing magnet 772 can be of any shape that can be accommodated in the second receiving groove 762a and 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.

[0620] 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.

[0621] The second arc-extinguishing magnet 772 includes a first surface 772a and a second surface 772b.

[0622] The first surface 772a forms the side of the second arc-extinguishing magnet 772 facing the support plate 710. In other words, the first surface 772a forms the side of the second arc-extinguishing magnet 772 opposite to the grid 720. In the illustrated embodiment, the first surface 772a may be defined by the left side or the outer side of the second arc-extinguishing magnet 772.

[0623] 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 may be defined by the right side or the inner side of the second arc-extinguishing magnet 772.

[0624] 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 that face each other.

[0625] The first surface 772a can be magnetized to either an N pole or a S pole. Similarly, the second surface 772b can be magnetized to either an N pole or a S pole. That is, the first surface 772a and the second surface 772b are magnetized to opposite polarities. This creates a secondary magnetic field (SMF) between the first surface 772a and the second surface 772b.

[0626] The third arc-extinguishing magnet 773 forms a magnetic field for the path AP used to form an electric arc.

[0627] The third arc-extinguishing magnet 773 can generate a secondary magnetic field SMF on its own. 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 a primary magnetic field MMF.

[0628] The third arc-extinguishing magnet 773 can be arranged in any form capable of forming a magnetic field. In one embodiment, the third arc-extinguishing magnet 773 can be a permanent magnet or an electromagnet.

[0629] The third arc-extinguishing magnet 773 can be in a predetermined shape. In the illustrated embodiment, the third arc-extinguishing magnet 773 is formed as a rectangular cross-section with a length in the left-right direction greater than its length in the up-down direction.

[0630] The third arc-extinguishing magnet 773 can be of any shape that can be accommodated in the third receiving groove 763a and 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.

[0631] The third arc-extinguishing magnet 773 includes a first surface 773a and a second surface 773b.

[0632] The first surface 773a forms the side of the third arc-extinguishing magnet 773 facing the support plate 710. In other words, the first surface 773a forms the side of the third arc-extinguishing magnet 773 opposite to the grid 720. In the illustrated embodiment, the first surface 773a may be defined by the right side or the outer side of the third arc-extinguishing magnet 773.

[0633] 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 may be defined by the left side or the inner side of the third arc-extinguishing magnet 773.

[0634] 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 that face each other.

[0635] In addition, the second surface 773b is configured opposite to the second surface 772b of the second arc-extinguishing magnet 772.

[0636] The first surface 773a can be magnetized to either an N pole or a S pole. Similarly, the second surface 773b can be magnetized to either an N pole or a S pole. That is, the first surface 773a and the second surface 773b are magnetized to opposite polarities. This creates a secondary magnetic field (SMF) between the first surface 773a and the second surface 773b.

[0637] A detailed explanation of the process by which the main magnetic field MMF and the secondary magnetic field SMF are formed through the individual arc-extinguishing magnets 771, 772, and 773 will be provided later.

[0638] 7. Description of the path AP of the electric arc formed by the air circuit breaker 10 in various embodiments of the present invention

[0639] 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 separate, an electric arc is generated due to the current flowing through them.

[0640] The air circuit breaker 10 of this invention includes various configurations for forming an arc path AP for the generated arc to flow to the arc extinguishing section 600, 700.

[0641] Below, refer to Figures 31 to 44 The process of forming the arc path AP in the air circuit breaker 10 of the present invention will be described in detail.

[0642] The various embodiments described below can form an arc path AP independently, or an arc path AP can be formed by combining two or more embodiments with each other.

[0643] In the following explanation, a circle (⊙) is used to indicate that current flows out of the paper. Additionally, [the symbol] is used... The markings indicate that current flows into the paper.

[0644] It is understood that the part marked with the above markings is the part where the air circuit breaker 10 is energized with an external power source or load due to the contact between the fixed contact 311 and the movable contact 321.

[0645] (1) Explanation of the process by which the arc path AP is formed by the cover magnet part 400 in the embodiment of the present invention.

[0646] Reference Figures 31 to 32 The process of forming an electric arc path AP by the cover magnet part 400 of the present invention is described in detail.

[0647] Reference Figure 31 The front view of an air circuit breaker 10 including the cover magnet portion 400 according to an embodiment of the present invention is shown. Additionally, refer to... Figure 32 The top surface of an air circuit breaker 10 including the cover magnet portion 400 according to an embodiment of the present invention is shown.

[0648] For ease of understanding, the upper cover 110 has been omitted.

[0649] In the illustrated embodiment, the first to fourth cover magnets 410, 420, 430, and 440 of the cover magnet portion 400 are positioned to hold the respective fixed contacts 310 between them.

[0650] At this point, the upper surfaces of each of the cover magnets 410, 420, 430, and 440, i.e., their respective first surfaces 411, 421, 431, and 441, are arranged to have the S pole. Additionally, the lower surfaces of each of the cover magnets 410, 420, 430, and 440, i.e., their respective second surfaces 412, 422, 432, and 442, are arranged to have the N pole.

[0651] Each of the cover magnets 410, 420, 430, and 440 forms a secondary magnetic field SMF that serves as the magnetic field generated by itself.

[0652] Although not illustrated, the individual cap magnets 410, 420, 430, and 440 located adjacent to each other can form a main magnetic field MMF with each other.

[0653] exist Figure 31 In (a), the direction of the current flowing in each disconnection 300 is the direction of outflow from the drawing, that is, the current flowing in the air circuit breaker 10 is transmitted to the external power source or load through the fixed contact 310.

[0654] In addition, the direction of the secondary 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 bottom to top in the illustrated embodiment.

[0655] When Ampere's left-hand rule is applied at the contact points 311 and 321, the arc path AP can be anticipated. That is, the electromagnetic force formed by the secondary magnetic field SMF and the flowing current is formed towards one side edge of the arc extinguishing parts 600 and 700, which is the upper left side in the illustrated embodiment.

[0656] Therefore, in Figure 31 In the embodiment shown in (a), the generated 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.

[0657] exist Figure 31 In (b), the direction of the current flowing in each disconnection 300 is towards the direction of the flow in the figure, that is, the current flowing from the external power source or load is transmitted to the air circuit breaker 10 through the fixed contact 310.

[0658] In addition, the direction of the secondary 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 bottom to top in the illustrated embodiment.

[0659] When Ampere's left-hand rule is applied at the contact points 311 and 321, the arc path AP can be anticipated. That is, the electromagnetic force formed by the secondary magnetic field SMF and the flowing current is directed toward one edge of the arc-extinguishing parts 600 and 700, which is the upper right side in the illustrated embodiment.

[0660] Therefore, in Figure 31 (b) In the embodiment shown, the generated electric arc travels toward the opposite (i.e., right) edge of the grids 620, 720. Thus, the generated electric arc can flow rapidly and be extinguished.

[0661] Reference Figure 32 This shows the view from above. Figure 31 The example shown is a top view.

[0662] exist Figure 32 In (a), the direction of the current flowing in each disconnection 300 is such that the current flowing in the air circuit breaker 10 is transmitted to the external power source or load through the fixed contact 310. It can be understood that the direction of the current is... Figure 31 The same embodiment is shown in (a).

[0663] As described above, the secondary magnetic field SMF formed by each cover magnet 410, 420, 430, 440 is formed 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.

[0664] When Ampere's left-hand rule is applied at the contact points 311 and 321, the path AP of the arc can be anticipated. That is, the electromagnetic force formed by the secondary magnetic field SMF and the flowing current is formed towards one side edge of the arc-extinguishing parts 600 and 700, which is the upper left side in the illustrated embodiment.

[0665] Therefore, in Figure 32 In the embodiment shown in (a), the generated electric arc travels toward one side (i.e., the left side) edge of the grids 620, 720. Thus, the generated electric arc can move rapidly and be extinguished.

[0666] exist Figure 32 In (b), the direction of the current flowing in each disconnection 300 is such that the current flowing from an external power source or load is transmitted to the air circuit breaker 10 through the fixed contact 310. It can be understood that the direction of the current is... Figure 31 The embodiment shown in (b) is the same.

[0667] As described above, the secondary magnetic field SMF formed by each cover magnet 410, 420, 430, 440 is formed 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.

[0668] When Ampere's left-hand rule is applied at the contact points 311 and 321, the arc path AP can be anticipated. That is, the electromagnetic force formed by the secondary magnetic field SMF and the flowing current is directed toward one edge of the arc-extinguishing parts 600 and 700, which is the upper right side in the illustrated embodiment.

[0669] Therefore, in Figure 32 (b) In the embodiment shown, the generated arc travels toward the opposite (i.e., right) edge of the grids 620, 720. Thus, the generated arc can move rapidly and be extinguished.

[0670] In this embodiment, the first surfaces 411, 421, 431, and 441 of each of the cover magnets 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 of the cover magnets 410, 420, 430, and 440 can be magnetized to have the same polarity (i.e., N pole).

[0671] In this embodiment, even if the direction of the current flowing at each contact 311, 321 changes, the path AP of the arc will flow toward the ends of the grilles 620, 720 and the grille covers 630, 730.

[0672] Therefore, the generated electric arc can move rapidly along the path AP of the arc and be extinguished regardless of the direction of the current.

[0673] (2) Explanation of the process by which the arc-extinguishing part 600 of an embodiment of the present invention forms the arc path AP.

[0674] Reference Figures 33 to 36 The process of forming an arc path AP by the arc extinguishing part 600 according to an embodiment of the present invention is described in detail.

[0675] In the illustrated embodiment, for ease of understanding, only one of the plurality of arc-extinguishing sections 600 is shown. The formation of the arc path AP in the other arc-extinguishing sections 600 (not shown) can also be understood with reference to the following description.

[0676] Reference Figure 33 The front view of an arc-extinguishing part 600 according to an embodiment of the present invention is shown. Additionally, refer to... Figure 34The image shows a side cross-section of an arc-extinguishing section 600 according to an embodiment of the present invention.

[0677] As mentioned above, the arc-extinguishing part 600 of this embodiment includes an arc-extinguishing magnet 634 housed in the cover body 631.

[0678] 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.

[0679] The arc-extinguishing magnet 634 forms a secondary magnetic field SMF, which is a magnetic field generated by itself. The secondary magnetic field SMF formed by the arc-extinguishing magnet 634 is directed towards the grid 620, that is, from top to bottom in the illustrated embodiment.

[0680] exist Figure 33 In (a), the direction of the current flowing at each contact 311, 321 is outward from the drawing, that is, the current flowing in the air circuit breaker 10 is transmitted to the external power source or load through the fixed contact 310.

[0681] Here, when Ampere's left-hand rule is applied at the contact points 311, 321, the path AP of the electric arc can be anticipated. That is, the electromagnetic force formed by the secondary magnetic field SMF and the current flowing at each contact 311, 321 is formed towards one side edge of the grid 620, which is the upper right side in the illustrated embodiment.

[0682] exist Figure 33 In (b), the current flowing through each contact 311, 321 flows into the plane of the diagram, that is, the current flowing through the external power source or load is transmitted to the air circuit breaker 10 through each contact 311, 321.

[0683] Here, when Ampere's left-hand rule is applied at the contact points 311, 321, the path AP of the arc can be anticipated. That is, the electromagnetic force formed by the secondary magnetic field SMF and the current flowing at each contact 311, 321 is formed towards the other edge of the grid 620, in the upper left direction in the illustrated embodiment.

[0684] As described above, the left and right ends of the grid 620 can be pointed. Therefore, the electric arc can flow along the path AP of the formed arc and enter the ends of the grid 620.

[0685] 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 that communicates with the outside, a mesh portion 633, and a through hole 636a of the barrier plate 636.

[0686] Therefore, the generated electric arc can move rapidly along the path AP of the formed arc and be extinguished, discharged to the outside.

[0687] exist Figure 34 In (a), the current flowing at each contact 311, 321 is directed away from the arc-extinguishing section 600, that is, the current flowing in the air circuit breaker 10 is transmitted to the external power source or load through the fixed contact 310 (see reference). Figure 34 (a) solid arrow.

[0688] Here, when Ampere's left-hand rule is applied at the contact points 311 and 321, the path AP of the electric arc can be anticipated. That is, the electromagnetic force formed by the secondary magnetic field SMF and the current flowing at each contact point 311 and 321 is formed in the direction of entering the drawing, i.e., the left side of the grid 620.

[0689] Although not illustrated, it is understandable, such as Figure 33 In the embodiment shown in (a), the path AP of the electric arc is formed toward the grid cover 630 located on the upper side of the grid 620.

[0690] exist Figure 34 In (b), the direction of the current flowing through each contact 311, 321 is towards the arc-extinguishing section 600, that is, the current flowing from the external power source or load is transmitted to the air circuit breaker 10 through each contact 311, 321 (see reference). Figure 34 (b) solid arrow.

[0691] Here, when Ampere's left-hand rule is applied at the contact points 311 and 321, the path AP of the electric arc can be anticipated. That is, the electromagnetic force formed by the secondary magnetic field SMF and the current flowing at each contact 311 and 321 is formed in the direction out of the diagram, i.e., to the right of the grid 620.

[0692] Although not illustrated, it can be understood that in this embodiment, as... Figure 33 In the embodiment shown in (b), the path AP of the electric arc is formed toward the grid cover 630 located on the upper side of the grid 620.

[0693] As described above, the left and right ends of the grid 620 can be pointed. Therefore, the electric arc can flow along the path AP of the formed arc and enter the ends of the grid 620.

[0694] Therefore, the generated electric arc can move rapidly along the path AP of the formed arc and be extinguished, discharged to the outside.

[0695] Reference Figure 35The front view of an arc-extinguishing part 600 according to an embodiment of the present invention is shown. Additionally, refer to... Figure 36 The image shows a side cross-section of the arc-extinguishing part 600 according to an embodiment of the present invention.

[0696] As described above, the arc-extinguishing part 600 of this embodiment includes an arc-extinguishing magnet 634 housed in the cover body 631.

[0697] 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.

[0698] The arc-extinguishing magnet 634 forms a secondary magnetic field SMF as a magnetic field generated by itself. The secondary magnetic field SMF formed by the arc-extinguishing magnet 634 is oriented away from the grid 620, that is, from bottom to top in the illustrated embodiment.

[0699] exist Figure 35 In (a), the current flowing at each contact 311, 321 flows out from the drawing, that is, the current flowing in the air circuit breaker 10 is transmitted to the external power source or load through the fixed contact 310.

[0700] Here, when Ampere's left-hand rule is applied at the contact points 311, 321, the path AP of the electric arc can be anticipated. That is, the electromagnetic force formed by the secondary magnetic field SMF and the current flowing at each contact 311, 321 is formed towards one side edge of the grid 620, which in the illustrated embodiment is the upper left side.

[0701] exist Figure 35 In (b), the current flowing through each contact 311, 321 enters the plane, that is, the current flowing through the external power source or load is transmitted to the air circuit breaker 10 through each contact 311, 321.

[0702] Here, when Ampere's left-hand rule is applied at the contact points 311, 321, the path AP of the arc can be anticipated. That is, the electromagnetic force formed by the secondary magnetic field SMF and the current flowing at each contact 311, 321 is formed towards the other edge of the grid 620, which in the illustrated embodiment is the upper right direction.

[0703] exist Figure 36 In (a), the current flowing at each contact 311, 321 is directed away from the arc-extinguishing section 600, that is, the current flowing in the air circuit breaker 10 is transmitted to the external power source or load through the fixed contact 310 (see reference). Figure 36 (a) solid arrow.

[0704] Here, when Ampere's left-hand rule is applied at the contact points 311 and 321, the path AP of the electric arc can be anticipated. That is, the electromagnetic force formed by the secondary magnetic field SMF and the current flowing at each contact 311 and 321 is formed in the direction out of the diagram, i.e., to the right of the grid 620.

[0705] Although not illustrated, it is understandable, such as Figure 35 In the embodiment shown in (a), the path AP of the electric arc is formed toward the grid cover 630 located on the upper side of the grid 620.

[0706] 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 current flowing from the external power source or load is transmitted to the air circuit breaker 10 through each contact 311, 321 (see reference). Figure 36 (b) solid arrow.

[0707] Here, when Ampere's left-hand rule is applied at the contact points 311 and 321, the path AP of the electric arc can be anticipated. That is, the electromagnetic force formed by the secondary magnetic field SMF and the current flowing at each contact point 311 and 321 is formed in the direction of entering the drawing, i.e., the left side of the grid 620.

[0708] Although not illustrated, it is understandable, such as Figure 33 (b) In the embodiment shown, the path AP of the electric arc is formed toward the grid cover 630 located on the upper side of the grid 620.

[0709] As described above, the left and right ends of the grid 620 can be pointed. Therefore, the electric arc can flow along the path AP of the formed arc and enter the ends of the grid 620.

[0710] 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 that communicates with the outside, a mesh portion 633, and a through hole 636a of the barrier plate 636.

[0711] Therefore, the generated electric arc can move rapidly along the path AP of the formed arc and be extinguished, discharged to the outside.

[0712] In this embodiment, even if the polarity of the arc-extinguishing magnet 634 changes, the path AP of the formed arc is formed in the width direction of the grille 620, which is the left-right direction in the illustrated embodiment. In addition, the path AP of the formed arc is formed towards the grille cover 630 located in the opposite position to each contact 311, 321.

[0713] Furthermore, even if the direction of the current flowing through 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.

[0714] Therefore, even if the polarity of the arc-extinguishing magnet 634 and the direction of the flowing current change, the generated arc can move rapidly along the arc path AP and be extinguished.

[0715] (3) Explanation of the process of forming the arc path AP through the CT magnet part 500 of one embodiment of the present invention and the arc extinguishing part 600 of another embodiment.

[0716] 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.

[0717] As described above, the CT magnet section 500 of the present invention includes a CT magnet 530.

[0718] The CT magnet 530 is housed in the space 520 of the housing 510 and forms a secondary magnetic field SMF. In addition, the CT magnet 530 can form a primary magnetic field MMF together with the arc-extinguishing magnet 634 of the arc-extinguishing section 600.

[0719] Furthermore, as described above, the arc-extinguishing part 600 of one embodiment of the present invention includes an arc-extinguishing magnet 634.

[0720] The arc-extinguishing magnet 634 is housed inside the grid cover 630 and forms a secondary magnetic field SMF. In addition, the arc-extinguishing magnet 634 can form a primary magnetic field MMF together with the CT magnet 530 of the CT magnet section 500.

[0721] At this point, the opposing surfaces of the CT magnet 530 and the arc-extinguishing magnet 634, namely the first surface 531 of the CT magnet 530 and the second surface 634b of the arc-extinguishing magnet 634, can be magnetized to have different polarities.

[0722] Reference Figure 37 The front view of an air circuit breaker 10, including a CT magnet portion 500 according to an embodiment of the present invention and an arc-extinguishing portion 600 according to another embodiment, is shown. Additionally, refer to... Figure 38 The image shows a side view 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.

[0723] 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 secondary magnetic field SMF, which is itself a magnetic field.

[0724] 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 the other contact 311, 321 or the CT magnet section 500, is magnetized as the N pole. The arc-extinguishing magnet 634 forms a secondary magnetic field SMF as a magnetic field generated by itself.

[0725] 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, which is the top-down direction in the illustrated embodiment.

[0726] exist Figure 37 In (a), the current flowing through each contact 311, 321 flows out of the diagram, that is, the current flowing in the air circuit breaker 10 is transmitted to the external power source or load through the fixed contact 310.

[0727] Here, when Ampere's left-hand rule is applied at the contact points 311 and 321, the path AP of the arc can be anticipated.

[0728] That is, the electromagnetic force formed by the main magnetic field MMF formed between the CT magnet 530 and the arc-extinguishing magnet 634 and the current flowing at each contact 311, 321 is formed toward one side edge of the grille 620, which is the upper right side in the illustrated embodiment.

[0729] exist Figure 37 In (b), the current flowing through each contact 311, 321 is directed toward the direction of entering the drawing, that is, the current flowing through the external power source or load is transmitted to the air circuit breaker 10 through each contact 311, 321.

[0730] Here, when Ampere's left-hand rule is applied at the contact points 311 and 321, the path AP of the arc can be anticipated.

[0731] That is, the electromagnetic force formed by the main magnetic field MMF formed between the CT magnet 530 and the arc-extinguishing magnet 634 and the current flowing at each contact 311, 321 is formed toward one side edge of the grille 620, which is the upper left side in the illustrated embodiment.

[0732] exist Figure 38 In (a), the current flowing through each contact 311, 321 is directed away from the arc-extinguishing section 600, that is, the current flowing in the air circuit breaker 10 is transferred to the external power source or load through each contact 311, 321 (see reference). Figure 38 (a) solid arrow.

[0733] Here, when Ampere's left-hand rule is applied at the contact points 311 and 321, the path AP of the arc can be anticipated.

[0734] That is, the electromagnetic force formed by the main magnetic field MMF formed between the CT magnet 530 and the arc-extinguishing magnet 634 and the current flowing at each contact 311, 321 is formed in the direction from the drawing, that is, the right side of the grid 620.

[0735] Although not illustrated, it is understandable, such as Figure 37 In the embodiment shown in (a), the path AP of the electric arc is formed toward the grid cover 630 located on the upper side of the grid 620.

[0736] exist Figure 38 In (b), the current flowing through each contact 311, 321 is directed toward the arc-extinguishing section 600, that is, the current flowing from the external power source or load is transmitted to the air circuit breaker 10 through each contact 311, 321 (see reference). Figure 38 (b) solid arrow.

[0737] Here, when Ampere's left-hand rule is applied at the contact points 311 and 321, the path AP of the arc can be anticipated.

[0738] That is, the electromagnetic force formed by the main magnetic field MMF formed between the CT magnet 530 and the arc-extinguishing magnet 634 and the current flowing at each contact 311, 321 is formed in the direction of entering the drawing, that is, the left side of the grid 620.

[0739] Although not illustrated, it is understandable, such as Figure 37 (b) In the embodiment shown, the path AP of the electric arc is formed toward the grid cover 630 located on the upper side of the grid 620.

[0740] As described above, the left and right ends of the grid 620 can be pointed. Therefore, the electric arc can flow along the path AP of the formed arc and enter the ends of the grid 620.

[0741] 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 that communicates with the outside, a mesh portion 633, and a through hole 636a of the barrier plate 636.

[0742] Therefore, the generated electric arc can move rapidly along the path AP of the formed arc and be extinguished, discharged to the outside.

[0743] Reference Figure 39 The front view of an air circuit breaker 10, including a CT magnet portion 500 according to an embodiment of the present invention and an arc-extinguishing portion 600 according to another embodiment, is shown. Additionally, refer to... Figure 40 The image 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.

[0744] 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 secondary magnetic field SMF, which is a magnetic field generated by itself.

[0745] 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 the other contact 311, 321 or the CT magnet section 500, is magnetized as the S pole. The arc-extinguishing magnet 634 forms a secondary magnetic field SMF as a magnetic field generated by itself.

[0746] 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 from the first surface 531 of the CT magnet 530 toward the second surface 634b of the arc-extinguishing magnet 634, which in the illustrated embodiment is from the bottom to the top.

[0747] exist Figure 39 In (a), the current flowing at each contact 311, 321 flows out from the drawing, that is, the current flowing in the air circuit breaker 10 is transmitted to the external power source or load through the fixed contact 310.

[0748] Here, when Ampere's left-hand rule is applied at the contact points 311 and 321, the path AP of the arc can be anticipated.

[0749] That is, the electromagnetic force formed by the main magnetic field MMF formed between the CT magnet 530 and the arc-extinguishing magnet 634 and the current flowing at each contact 311, 321 is directed toward one side edge of the grille 620, which is the upper left side in the illustrated embodiment.

[0750] exist Figure 39 In (b), the current flowing through each contact 311, 321 is directed toward the direction of entering the drawing, that is, the current flowing through the external power source or load is transmitted to the air circuit breaker 10 through each contact 311, 321.

[0751] Here, when Ampere's left-hand rule is applied at the contact points 311 and 321, the path AP of the arc can be anticipated.

[0752] That is, the electromagnetic force formed by the main magnetic field MMF formed between the CT magnet 530 and the arc-extinguishing magnet 634 and the current flowing at each contact 311, 321 is formed toward one side edge of the grille 620, which is the upper right side in the illustrated embodiment.

[0753] exist Figure 40 In (a), the current flowing through each contact 311, 321 is directed away from the arc-extinguishing section 600, that is, the current flowing in the air circuit breaker 10 is transferred to the external power source or load through each contact 311, 321 (see reference). Figure 40 (a) solid arrow.

[0754] Here, when Ampere's left-hand rule is applied at the contact points 311 and 321, the path AP of the arc can be anticipated.

[0755] That is, the electromagnetic force formed by the main magnetic field MMF formed between the CT magnet 530 and the arc-extinguishing magnet 634 and the current flowing at each contact 311, 321 is formed in the direction of entering the drawing, that is, the left side of the grid 620.

[0756] Although not illustrated, it is understandable, such as Figure 39 In the embodiment shown in (a), the path AP of the electric arc is formed toward the grid cover 630 located on the upper side of the grid 620.

[0757] exist Figure 40 In (b), the current flowing through each contact 311, 321 is directed toward the arc-extinguishing section 600, that is, the current flowing from the external power source or load is transmitted to the air circuit breaker 10 through each contact 311, 321 (see reference). Figure 40(b) Solid arrow.

[0758] Here, when Ampere's left-hand rule is applied at the contact points 311 and 321, the path AP of the arc can be anticipated.

[0759] That is, the electromagnetic force formed by the main magnetic field MMF formed between the CT magnet 530 and the arc-extinguishing magnet 634 and the current flowing at each contact 311, 321 is formed in the direction from the drawing, that is, the right side of the grid 620.

[0760] Although not illustrated, it is understandable, such as Figure 39 (b) In the embodiment shown, the path AP of the electric arc is formed toward the grid cover 630 located on the upper side of the grid 620.

[0761] As described above, the left and right ends of the grid 620 can be pointed. Therefore, the electric arc can flow along the path AP of the formed arc and enter the ends of the grid 620.

[0762] 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 that communicates with the outside, a mesh portion 633, and a through hole 636a of the barrier plate 636.

[0763] Therefore, the generated electric arc can move rapidly along the path AP of the formed arc and be extinguished, discharged to the outside.

[0764] 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 of the grille 620, which is the left-right direction in the illustrated embodiment. Furthermore, the path AP of the formed arc is formed towards the grille cover 630 located in the opposite position to each contact 311, 321.

[0765] Furthermore, even if the direction of the current flowing through 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.

[0766] Therefore, even if the polarity of the arc-extinguishing magnet 634 and the direction of the flowing current change, the generated arc can move rapidly along the arc path AP and be extinguished.

[0767] In addition, the CT magnet 530 and the arc-extinguishing magnet 634 each form a secondary magnetic field SMF. Each secondary magnetic field SMF is formed in the same direction as the primary magnetic field MMF formed between the CT magnet 530 and the arc-extinguishing magnet 634.

[0768] Therefore, the strength of the magnetic field along the path AP used to form the electric arc can be enhanced. As a result, since the strength of the electromagnetic force is also enhanced, the generated electric arc can quickly move along the path AP towards the arc-extinguishing section 600 and be extinguished.

[0769] (4) Explanation of the process of forming the arc path AP by the arc extinguishing part 700 of another embodiment of the present invention

[0770] Reference Figures 41 to 44 The process of forming the arc path AP by the arc extinguishing part 700 according to another embodiment of the present invention is described in detail.

[0771] 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.

[0772] Each arc-extinguishing magnet 771, 772, and 773 forms a secondary magnetic field SMF. In addition, a primary magnetic field MMF is formed between each arc-extinguishing magnet 771, 772, and 773.

[0773] At this time, the opposing surfaces of the second arc-extinguishing magnet 772 and the third arc-extinguishing magnet 773, namely the second surface 772b of the second arc-extinguishing magnet 772 and the second surface 773b of the third arc-extinguishing magnet 773, can be magnetized to the same polarity.

[0774] In addition, the side of the first arc-extinguishing magnet 771 facing the grid 720, namely 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.

[0775] Reference Figure 41 The front view of the arc-extinguishing part 700 according to another embodiment of the present invention is shown. Additionally, refer to... Figure 42 The bottom surface of the arc-extinguishing part 700 according to another embodiment of the present invention is shown.

[0776] 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 first arc-extinguishing magnet 771 forms a secondary magnetic field SMF that serves as the magnetic field formed between the first surface 771a and the second surface 771b.

[0777] 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 opposite to the first arc-extinguishing magnet 771, is magnetized as the S pole. The second arc-extinguishing magnet 772 forms a secondary magnetic field SMF that serves as the magnetic field formed between the first surface 772a and the second surface 772b.

[0778] 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 opposite to the first arc-extinguishing magnet 771, is magnetized as the S pole. The third arc-extinguishing magnet 773 forms a secondary magnetic field SMF that serves as the magnetic field formed between the first surface 773a and the second surface 773b.

[0779] 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 from the direction of the second surface 771b of the first arc-extinguishing magnet 771 toward the second surface 772b of the second arc-extinguishing magnet 772, or in the illustrated embodiment, from the direction of the first arc-extinguishing magnet 771 toward the left.

[0780] 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 from the second surface 771b of the first arc-extinguishing magnet 771 toward the second surface 773b of the third arc-extinguishing magnet 773, or in the illustrated embodiment, from the first arc-extinguishing magnet 771 toward the right.

[0781] exist Figure 41 In (a), the current flowing at each contact 311, 321 flows outward from the drawing, that is, the current flowing in the air circuit breaker 10 is transmitted to the power source or load of the part through the fixed contact 310.

[0782] Here, when Ampere's left-hand rule is applied at the contact points 311 and 321, the path AP of the arc can be anticipated.

[0783] That is, the electromagnetic force formed by the main magnetic field MMF, the secondary magnetic field SMF, and the current flowing at each contact 311, 321 is directed toward one side edge of the grille 720, which in the illustrated embodiment is the upper right side. Consequently, the path AP of the electric arc is also formed toward the upper right side.

[0784] exist Figure 41In (b), the current flowing through each contact 311, 321 is directed toward the direction of entering the drawing, that is, the current flowing through the external power source or load is transmitted to the air circuit breaker 10 through each contact 311, 321.

[0785] Here, when Ampere's left-hand rule is applied at the contact points 311 and 321, the path AP of the arc can be anticipated.

[0786] That is, the electromagnetic force formed by the main magnetic field MMF, the secondary magnetic field SMF, and the current flowing at each contact 311, 321 is formed towards the other edge of the grille 720, which in the illustrated embodiment is the upper left side. As a result, the path AP of the electric arc is also formed towards the upper left side.

[0787] exist Figure 42 In (a), the current flowing in each contact 311, 321 is directed toward the arc extinguishing section 700, that is, the current flowing in the external power source or load is transmitted to the air circuit breaker 10 through each contact 311, 321.

[0788] Here, when Ampere's left-hand rule is applied at the contact points 311 and 321, the path AP of the arc can be anticipated.

[0789] That is, the electromagnetic force formed by the main magnetic field MMF, the secondary magnetic field SMF and the current flowing at each contact 311, 321 is formed in the direction of entering the drawing, that is, the direction of the grid 720.

[0790] Although not illustrated, it is understandable, such as Figure 41 In the embodiment shown in (a), the path AP of the electric arc is formed toward the right side of the grid 720.

[0791] exist Figure 42 In (b), the current flowing in each contact 311, 321 is directed toward the arc extinguishing section 700, that is, the current flowing in the air circuit breaker 10 is transmitted to the external power source or load through each contact 311, 321.

[0792] Here, when Ampere's left-hand rule is applied at the contact points 311 and 321, the path AP of the arc can be anticipated.

[0793] That is, the electromagnetic force formed by the main magnetic field MMF, the secondary magnetic field SMF and the current flowing at each contact 311, 321 is formed in the direction of entering the drawing, that is, the direction of the grid 720.

[0794] Although not illustrated, it is understandable, such as Figure 41 In the embodiment shown in (a), the path AP of the electric arc is formed toward the left side of the grid 720.

[0795] As described above, the left and right ends of the grid 720 can be pointed. Therefore, the electric arc can flow along the path AP of the formed arc and enter the ends of the grid 720.

[0796] 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.

[0797] Therefore, the generated electric arc can move rapidly along the path AP of the formed arc and be extinguished, discharged to the outside.

[0798] Reference Figure 43 The front view of the arc-extinguishing part 700 according to another embodiment of the present invention is shown. Additionally, refer to... Figure 44 The bottom surface of the arc-extinguishing part 700 according to another embodiment of the present invention is shown.

[0799] 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 first arc-extinguishing magnet 771 forms a secondary magnetic field SMF that serves as the magnetic field formed between the first surface 771a and the second surface 771b.

[0800] 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 opposite to the first arc-extinguishing magnet 771, is magnetized as the N pole. The second arc-extinguishing magnet 772 forms a secondary magnetic field SMF that serves as the magnetic field between the first surface 772a and the second surface 772b.

[0801] 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 opposite to the first arc-extinguishing magnet 771, is magnetized as the N pole. The third arc-extinguishing magnet 773 forms a secondary magnetic field SMF as a magnetic field formed between the first surface 773a and the second surface 773b.

[0802] 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 from the second surface 772b of the second arc-extinguishing magnet 772 toward the second surface 771b of the first arc-extinguishing magnet 771, or in the illustrated embodiment, from the second arc-extinguishing magnet 772 toward the right.

[0803] 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 from the direction of the second surface 773b of the third arc-extinguishing magnet 773 toward the second surface 771b of the first arc-extinguishing magnet 771, or in the illustrated embodiment, from the direction of the third arc-extinguishing magnet 773 toward the left.

[0804] exist Figure 43 In (a), the current flowing at each contact 311, 321 flows outward from the drawing, that is, the current flowing in the air circuit breaker 10 is transmitted to the external power source or load through the fixed contact 310.

[0805] Here, when Ampere's left-hand rule is applied at the contact points 311 and 321, the path AP of the arc can be anticipated.

[0806] That is, the electromagnetic force formed by the main magnetic field MMF, the secondary magnetic field SMF, and the current flowing at each contact 311, 321 is formed towards one side edge of the grille 720, which in the illustrated embodiment is the upper left side. As a result, the path AP of the electric arc is also formed from the upper left side.

[0807] exist Figure 43 In (b), the current flowing through each contact 311, 321 is directed toward the direction of entering the drawing, that is, the current flowing through the external power source or load is transmitted to the air circuit breaker 10 through each contact 311, 321.

[0808] Here, when Ampere's left-hand rule is applied at the contact points 311 and 321, the path AP of the arc can be anticipated.

[0809] That is, the electromagnetic force formed by the main magnetic field MMF, the secondary magnetic field SMF, and the current flowing at each contact 311, 321 is formed towards the other edge of the grille 720, which in the illustrated embodiment is the upper right side. As a result, the path AP of the electric arc is also formed towards the upper right side.

[0810] exist Figure 44 In (a), the current flowing in each contact 311, 321 is directed toward the arc extinguishing section 700, that is, the current flowing in the external power source or load is transmitted to the air circuit breaker 10 through each contact 311, 321.

[0811] Here, when Ampere's left-hand rule is applied at the contact points 311 and 321, the path AP of the arc can be anticipated.

[0812] That is, the electromagnetic force formed by the main magnetic field MMF, the secondary magnetic field SMF and the current flowing at each contact 311, 321 is formed in the direction of entering the drawing, that is, the direction of the grid 720.

[0813] Although not illustrated, it is understandable, such as Figure 43 In the embodiment shown in (a), the path AP of the electric arc is formed toward the left side of the grid 720.

[0814] exist Figure 44 In (b), the current flowing in each contact 311, 321 is directed toward the arc extinguishing section 700, that is, the current flowing in the air circuit breaker 10 is transmitted to the external power source or load through each contact 311, 321.

[0815] Here, when Ampere's left-hand rule is applied at the contact points 311 and 321, the path AP of the arc can be anticipated.

[0816] That is, the electromagnetic force formed by the main magnetic field MMF, the secondary magnetic field SMF and the current flowing at each contact 311, 321 is formed in the direction of entering the drawing, that is, the direction of the grid 720.

[0817] Although not illustrated, it is understandable, such as Figure 43 In the embodiment shown in (a), the path AP of the electric arc is formed toward the right side of the grid 720.

[0818] As described above, the left and right ends of the grid 720 can be pointed. Therefore, the electric arc can flow along the path AP of the formed arc and enter the ends of the grid 720.

[0819] 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.

[0820] Therefore, the generated electric arc can move rapidly along the path AP of the formed arc and be extinguished, discharged to the outside.

[0821] 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, which is the left-right direction in the illustrated embodiment. In addition, the path AP of the formed arc is formed towards the grille cover 730 located in the opposite position to each contact 311, 321.

[0822] Furthermore, even if the direction of the current flowing through 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.

[0823] Therefore, even if the polarity of each arc-extinguishing magnet 771, 772, 773 and the direction of the flowing current change, the generated arc can move rapidly along the arc path AP and be extinguished.

[0824] In addition, each of the arc-extinguishing magnets 771, 772, and 773 forms a secondary magnetic field SMF. Each secondary magnetic field SMF is formed in the same direction as the primary magnetic field MMF formed between each of the arc-extinguishing magnets 771, 772, and 773.

[0825] Therefore, the strength of the magnetic field along the path AP used to form the electric arc can be enhanced. As a result, the strength of the electromagnetic force is also enhanced, so the generated electric arc can quickly move along the path AP towards the arc-extinguishing section 700 and be extinguished.

[0826] The above description refers to preferred embodiments of the present invention. However, it is understood that those skilled in the art can make various modifications and changes to the present invention within the spirit and scope of the invention as set forth in the claims.

[0827] Industrial applicability

[0828] This invention relates to air circuit breakers and can provide an air circuit breaker that can effectively eliminate electric arcs caused by current interruption, thus having industrial applicability.

Claims

1. An air circuit breaker, wherein, include: Fixed contacts; The movable contact can move toward or away from the fixed contact; The arc-extinguishing part is located near the fixed contact and the movable contact to extinguish the electric arc generated by the separation of the fixed contact and the movable contact; A movable contact, configured to be spaced downward from the movable contact and electrically connected to the movable contact, and The CT magnet is configured to be spaced downward from the fixed contact and the movable contact, covering a portion of the movable contact. The CT magnet part includes a CT magnet, which forms a magnetic field in the direction from the CT magnet part toward the arc-extinguishing part or in the direction from the arc-extinguishing part toward the CT magnet part.

2. The air circuit breaker according to claim 1, wherein, The CT magnet unit includes a housing with an internal space. The CT magnet is housed within the space of the housing.

3. The air circuit breaker according to claim 2, wherein, The CT magnet includes: The first surface, the first surface being the side of the CT magnet facing the arc-extinguishing part; and The second side is the side of the CT magnet opposite to the arc-extinguishing part; The first surface is magnetized to either the N pole or the S pole, and the second surface is magnetized to either the N pole or the S pole.

4. The air circuit breaker according to claim 2, wherein, The movable contact extends in the opposite direction to the arc-extinguishing part. The movable contact is electrically engaged at a position adjacent to one end of the movable contact, with a portion of the other end of the movable contact exposed externally. The CT magnet is integrated into the housing, covering the externally exposed portion of the movable contact.

5. The air circuit breaker according to claim 4, wherein, The CT magnet includes a cover that covers the space by being combined with the housing.

6. The air circuit breaker according to claim 4, wherein, include: The upper cover has an internal space to accommodate the fixed contact, the movable contact, and a portion of the arc-extinguishing part; as well as The lower cover, combined with the upper cover, forms a space inside; The other end of the movable contact extends from the movable contact toward the interior space of the lower cover. The CT magnet is attached to the outside of the lower cover.

7. The air circuit breaker according to claim 1, wherein, The arc-extinguishing part includes: A pair of support plates, configured to be spaced apart from each other and facing each other; The cover body, respectively coupled to a pair of support plates, is located on the opposite side of the fixed contact relative to the support plates; and An arc-extinguishing magnet is housed within the interior space of the cover body, forming a magnetic field in the direction from the arc-extinguishing part toward the CT magnet part or from the CT magnet part toward the arc-extinguishing part.

8. The air circuit breaker according to claim 7, wherein, The faces of the arc-extinguishing magnet and the CT magnet that are opposite each other are magnetized to have different polarities.

9. The air circuit breaker according to claim 7, in, include: A barrier plate is accommodated within the internal space of the cover body, and the arc-quenching magnet is disposed on the barrier plate; and A magnet cover, housed within the internal space of the cover body, is placed on the barrier plate and surrounds the arc-extinguishing magnet.

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