Circuit breaker

Abstract

A circuit breaker is disclosed. The circuit breaker according to one aspect of the present invention comprises: a main frame having a space formed therein and including a fixed contact point positioned in the space; a movable assembly rotatably accommodated in the space of the main frame; a mechanism, which is accommodated in the space of the main frame, is disposed to face the fixed contact point with the movable assembly interposed therebetween, and applies power to the movable assembly; and a shaft assembly coupled to the mechanism so as to receive the power, and link-fitted to the movable assembly so as to transmit the power to the movable assembly, wherein the shaft assembly includes: a main link, which is rotated by the mechanism and extends a first length; and a sub-link, which is rotatably coupled to each of the main link and the movable assembly and extends a second length, the first length being at least twice the second length.

Description

circuit breaker

[0001] The present invention relates to a circuit breaker, and more specifically, to a circuit breaker having a structure in which the opening and closing performance is improved by increasing the travel distance of the movable contact and the number of grids for extinguishing the arc can be increased.

[0002] A circuit breaker is installed in a power system and connected to the power source and the load, respectively, to enable current flow. If an abnormal current occurs between the power source and the load, the circuit breaker performs a tripping operation to interrupt the current flow between them. As a result, the power source and the load can be protected from damage caused by the abnormal current.

[0003] Typically, a circuit breaker includes a fixed contact that is fixedly installed and a movable contact that is movably provided. The movable contact is provided to be movable in a direction toward the fixed contact or in a direction opposite to the fixed contact. When the movable contact is in contact with the fixed contact, the power source and the load can be energized to each other. In the event of an abnormal current, the movable contact separates from the fixed contact, and the energization of the power source and the load is released.

[0004] Even at the moment when the movable contact and the fixed contact separate, the current—specifically the abnormal current—continues to flow through them. Therefore, when the movable contact and the fixed contact separate, the energy of the current being conducted is converted into a flow of electrons at high temperature and high pressure. This converted flow of electrons is called an arc.

[0005] As mentioned above, an arc is a flow of electrons at high temperature and high pressure. Therefore, if the arc remains inside the circuit breaker instead of being discharged to the outside, there is a risk that other components of the breaker may be damaged by the heat or pressure of the arc. Accordingly, a process is required to discharge the generated arc to the outside while reducing its temperature and pressure; this is called the arc extinguishing process.

[0006] For arc extinguishment, the arc must be extended sufficiently and rapidly. Furthermore, the extended arc must be able to be divided into short arcs (typically referred to as short arcs) and discharged externally. To this end, circuit breakers are generally equipped with an arc extinguishing mechanism comprising multiple grids. In this case, increasing the number of grids can improve the arc extinguishing effect and the cooling effect.

[0007] Meanwhile, as the travel distance of the movable contact increases, the separation distance between the movable contact and the fixed contact also increases, thereby improving the opening and closing performance. Additionally, when the separation distance increases, the number of grids spaced apart along the direction of movement of the movable contact can be increased, which can also improve the arc extinguishing and cooling effects.

[0008] However, if the distance between the movable contact and the fixed contact is increased without limitation, a design change of the entire circuit breaker is required, and consequently, there is a problem that the arrangement structure of each component of the circuit breaker must also be changed.

[0009] Korean Published Patent Document No. 10-2024-0178238 discloses a parallel cut-off load switch and a medium-voltage switching device having the same. Specifically, it discloses a parallel cut-off load switch and a medium-voltage switching device having the same, wherein the moving end of a movable switch contact is guided to a cam assembly and operably connected, thereby increasing the travel distance of the movable switch contact.

[0010] However, the parallel cutoff load switch, etc. disclosed in the aforementioned prior art requires a separate cam assembly to increase the travel distance of the movable switch contact. In other words, the aforementioned prior art does not provide a method for increasing the travel distance of the movable switch contact by utilizing an existing configuration without adding a new configuration.

[0011] Japanese Patent Publication No. 2024-136341 discloses an operating mechanism for a vacuum circuit breaker. Specifically, it discloses an operating mechanism for a vacuum circuit breaker that can precisely adjust the distance between a movable contact and a fixed contact by additionally providing a contact distance adjustment unit.

[0012] However, the operating mechanism of the vacuum circuit breaker disclosed in the aforementioned prior art does not increase the travel distance of the movable contact itself, but merely provides a method for positioning the movable contact at a predetermined location. In other words, the aforementioned prior art fails to provide a method for fundamentally increasing the travel distance of the movable contact.

[0013] Korean Published Patent Document No. 10-2024-0178238 (December 30, 2024)

[0014] Japanese Patent Publication No. 2024-136341 (October 4, 2024)

[0015] The present invention aims to solve the aforementioned problems, and the objective of the present invention is to provide a circuit breaker with a structure that improves the contact and separation performance of a fixed contact and a movable contact.

[0016] Another objective of the present invention is to provide a circuit breaker with a structure that can increase the travel distance of the movable contact.

[0017] Another objective of the present invention is to provide a circuit breaker with a structure that can increase the travel distance of the movable contact without the addition of new configurations.

[0018] Another objective of the present invention is to provide a circuit breaker with a structure that can increase the travel distance of the movable contact without excessive design changes.

[0019] The problems of the present invention are not limited to those mentioned above, and other unmentioned problems will be clearly understood by a person skilled in the art to which the present invention pertains from the description below.

[0020] According to one aspect of the present invention, a circuit breaker is provided, comprising: a main frame having a space formed therein and a fixed contact located in the space; a movable assembly rotatably accommodated in the space of the main frame; a mechanism accommodated in the space of the main frame and positioned to face the fixed contact with the movable assembly in between, and applying power to the movable assembly; and a shaft assembly coupled to the mechanism to receive the power and link-fitted to the movable assembly to transmit the power to the movable assembly, wherein the shaft assembly comprises a main link that is rotated by the mechanism and extends by a first length; and a sub-link that is rotatably coupled to the main link and the movable assembly, respectively and extends by a second length, wherein the first length is at least twice the second length.

[0021] At this time, a circuit breaker may be provided in which the ratio of the first length and the second length is 2.06.

[0022] Additionally, the above-described movable assembly may be provided with a circuit breaker comprising: a movable body rotatably coupled to the sub-link; a finger member coupled to one end of the height direction of the movable body; and a movable contact formed protruding from one surface of the finger member facing the fixed contact.

[0023] At this time, a circuit breaker may be provided in which the movable assembly is positioned in either a first state in which the movable contact is positioned apart from the fixed contact by a travel distance; and a second state in which the movable contact is in contact with the fixed contact.

[0024] Additionally, a circuit breaker may be provided in which the first angle, which is the angle between the main link and the sub link in the first state, is less than the second angle, which is the angle between the main link and the sub link in the second state.

[0025] At this time, a circuit breaker may be provided in which the size of the second angle is at least three times the size of the first angle.

[0026] Additionally, a circuit breaker may be provided in which the first angle is 51° and the second angle is 166.6°.

[0027] At this time, a circuit breaker may be provided, comprising: a shaft body that is coupled to the main link and rotates together with it, and is rotatably coupled to the mechanism; and a mechanism coupling part that is coupled to the shaft body and rotates together with it, and is coupled to the mechanism to receive the power.

[0028] Additionally, a circuit breaker may be provided in which the movable assembly is provided in a plurality, the plurality of movable assemblies are spaced apart along the width direction of the main frame, the shaft body extends along the width direction of the main frame, and the main link is provided in a plurality, the plurality of main links are spaced apart from each other along the extension direction of the shaft body.

[0029] At this time, a circuit breaker may be provided in which the sub-links are provided in plurality, and the plurality of sub-links are each rotatably coupled to the plurality of movable assemblies and the plurality of main links.

[0030] Additionally, a circuit breaker may be provided that includes an arc extinguishing mechanism coupled to the main frame and positioned adjacent to the fixed contact and the movable assembly.

[0031] At this time, a circuit breaker may be provided in which the movable assembly is coupled to the main frame so as to be movable along the longitudinal direction of the main frame, and the arc extinguishing mechanism is positioned adjacent to the fixed contact and the movable assembly and includes a plurality of grids spaced apart from each other along the longitudinal direction of the main frame.

[0032] According to the above configuration, the circuit breaker according to an embodiment of the present invention can improve the contact and separation performance of the fixed contact and the movable contact.

[0033] In addition, according to the above configuration, the travel distance of the movable contact of the circuit breaker according to the embodiment of the present invention may be increased.

[0034] In addition, according to the above configuration, the travel distance of the movable contact in the circuit breaker according to the embodiment of the present invention can be increased without the addition of a new configuration.

[0035] In addition, according to the above configuration, the travel distance of the movable contact in the circuit breaker according to the embodiment of the present invention can be increased without excessive design changes.

[0036] The effects of the present invention are not limited to the effects described above, and should be understood to include all effects that can be inferred from the configuration of the invention described in the detailed description or claims of the present invention.

[0037] FIG. 1 is a perspective view illustrating a circuit breaker according to an embodiment of the present invention.

[0038] Figure 2 is a front view illustrating the circuit breaker of Figure 1.

[0039] Figure 3 is a rear view illustrating the circuit breaker of Figure 1.

[0040] Figure 4 is an exploded perspective view illustrating the configuration of the circuit breaker of Figure 1.

[0041] FIG. 5 is a perspective view illustrating a main frame provided in the circuit breaker of FIG. 1.

[0042] FIG. 6 is a perspective view illustrating an arc extinguishing mechanism provided in the circuit breaker of FIG. 1.

[0043] FIG. 7 is a perspective view illustrating a mechanism provided in the circuit breaker of FIG. 1.

[0044] FIG. 8 is a perspective view illustrating a movable assembly and a shaft assembly provided in the circuit breaker of FIG. 1.

[0045] FIG. 9 is a plan view illustrating the movable assembly and shaft assembly of FIG. 8.

[0046] FIG. 10 is a bottom view illustrating the movable assembly and shaft assembly of FIG. 8.

[0047] FIG. 11 is a perspective view illustrating the movable assembly and shaft assembly of FIG. 8.

[0048] FIG. 12 is a BB cross-sectional view illustrating the movable assembly and shaft assembly of FIG. 8.

[0049] FIGS. 13 and FIGS. 14 are AA cross-sectional views illustrating each state in which the circuit breaker of FIG. 1 is operated.

[0050] Hereinafter, embodiments of the present invention are described in detail with reference to the attached drawings so that those skilled in the art can easily implement the invention. The present invention may be embodied in various different forms and is not limited to the embodiments described herein. To clearly explain the present invention, parts unrelated to the description in the drawings have been omitted, and the same reference numerals have been used throughout the specification for identical or similar components.

[0051] The words and terms used in this specification and claims are not limited to their ordinary or dictionary meanings, but should be interpreted in a meaning and concept consistent with the technical spirit of the invention in accordance with the principles by which the inventor defines terms and concepts to best describe his invention.

[0052] Therefore, the embodiments described in this specification and the configurations illustrated in the drawings correspond to preferred embodiments of the present invention and do not represent all technical ideas of the present invention; thus, various equivalents and modifications that may replace such configurations may exist at the time of filing the present invention.

[0053] In the following description, descriptions of some components may be omitted to clarify the features of the present invention.

[0054]

[0055] In the following description, the term "connection" refers to one or more members being connected to each other in a manner that allows for fluid communication. In one embodiment, the connection may be formed by members such as a conduit, a pipe, or a piping system. In the following description, the term "connection" may be used interchangeably with the meaning that one or more members are "fluidly connected" to each other.

[0056] In the following description, the term "conduction" means that one or more components are connected to each other to transmit current or electrical signals. In one embodiment, the conduction may be formed in a wired form by a conductor member, etc., or in a wireless form such as Bluetooth, Wi-Fi, or RFID. In one embodiment, the conduction may include the meaning of "communication."

[0057] As used in the following description, the term "fluid" refers to any form of substance that flows due to an external force and whose shape or volume, etc., can be deformed. In one embodiment, the fluid may be a liquid such as water or a gas such as air.

[0058] The terms "upper side," "lower side," "left side," "right side," "front side," and "rear side" used in the following description shall be understood by referring to the coordinate system depicted throughout the attached drawings.

[0059]

[0060] Referring to FIGS. 1 to 4, a circuit breaker (10) according to an embodiment of the present invention is illustrated. The circuit breaker (10) may be electrically connected to an external power source and a load, respectively. The circuit breaker (10) may allow or block the electrical connection between the external power source and the load.

[0061] The circuit breaker (10) may be provided in any form capable of controlling the electrical connection between an external power source and a load. In one embodiment, the circuit breaker (10) may be provided as an air circuit breaker (ACB). In the above embodiment, the arc generated inside the circuit breaker (10) may be cooled and extinguished using air as a medium.

[0062]

[0063] Any type of current may be supplied to the circuit breaker (10). In one embodiment, a high voltage and low current may be supplied to the circuit breaker (10). In this case, it is difficult to generate sufficient pressure to extinguish the arc caused by the low current value supplied.

[0064] Accordingly, the circuit breaker (10) according to an embodiment of the present invention is configured such that the contact gap distance, that is, the distance between the fixed contact (not given a reference numeral) and the movable contact (440) provided inside the main frame (100), is increased.

[0065] As the distance between the fixed contact (not labeled in the drawing) and the movable contact (440) increases, the arc extinguishing effect can be improved. Additionally, the insulation performance can be improved by sufficiently separating the fixed contact (not labeled in the drawing) and the movable contact (440).

[0066] At this time, the circuit breaker (10) according to an embodiment of the present invention can achieve the above effect by partially changing the structure of the configuration already provided in the circuit breaker (10) without adding a separate configuration.

[0067] Therefore, the structural change of the circuit breaker (10) is also minimized, so the above effect can be achieved simply.

[0068] In the embodiment illustrated in FIGS. 1 to 4, the circuit breaker (10) includes a main frame (100), an arc extinguishing mechanism (200), a mechanism (300), a movable assembly (400), and a shaft assembly (500).

[0069] The main frame (100) forms the outer shape of the circuit breaker (10). A space is formed inside the main frame (100) to accommodate other configurations of the circuit breaker (10). The main frame (100) can support other configurations of the accommodated circuit breaker (10).

[0070] In the illustrated embodiment, the main frame (100) accommodates an arc extinguishing mechanism (200), a mechanism (300), a movable assembly (400), and a shaft assembly (500). Some of the other components of the circuit breaker (10) accommodated inside the main frame (100) may be electrically connected to an external power source and load, respectively.

[0071] In the embodiment illustrated in FIG. 5, the main frame (100) includes a frame body (110), a sub-space (120), and a receiving space (130).

[0072] Additionally, referring to FIGS. 13 and 14, although not given a reference numeral, the main frame (100) includes a fixed contact positioned adjacent to the front side and in contact with and separated from the movable contact (440).

[0073] The frame body (110) constitutes the body of the main frame (100). Inside the frame body (110), a sub-circle space (120) and a receiving space (130) are formed. The frame body (110) surrounds the sub-circle space (120) and the receiving space (130).

[0074] The frame body (110) can support other components of the circuit breaker (10) accommodated in the arc extinguishing space (120) and the receiving space (130), namely the arc extinguishing mechanism (200), the mechanism (300), the movable assembly (400), and the shaft assembly (500). The frame body (110) can surround the arc extinguishing mechanism (200), the mechanism (300), the movable assembly (400), and the shaft assembly (500) from the outside.

[0075] The frame body (110) may have any shape capable of supporting an arc extinguishing mechanism (200), a mechanism (300), a movable assembly (400), and a shaft assembly (500), with an arc extinguishing space (120) and a receiving space (130) formed therein. In the illustrated embodiment, the frame body (110) is a three-dimensional shape having a length in the front-rear direction, a width in the left-right direction, and a height in the up-down direction.

[0076] In the above embodiment, one side in the height direction of the frame body (110), the upper side in the illustrated embodiment, is formed open so that the arc space (120) can communicate with the outside. Additionally, one side in the length direction of the frame body (110), the front side in the illustrated embodiment, is formed partially open so that the movable terminal (420) can be exposed to the outside.

[0077] The frame body (110) may be formed of an electrically insulating material. This is to prevent the arc extinguishing mechanism (200), mechanism (300), movable assembly (400), and shaft assembly (500) located inside the frame body (110) from being arbitrarily energized to the outside. The frame body (110) may be formed of a thermally insulating material. This is to prevent damage caused by heat generated along with the arc inside the frame body (110).

[0078] In one embodiment, the frame body (110) may be formed of a synthetic resin material such as reinforced plastic.

[0079] The arc extinguishing space (120) accommodates an arc extinguishing mechanism (200). The arc extinguishing mechanism (200) accommodated in the arc extinguishing space (120) may be supported by a frame body (110) surrounding the arc extinguishing space (120). The arc extinguishing space (120) may be at least partially surrounded by the frame body (110).

[0080] At this time, one side in the height direction of the arc extinguishing space (120), the upper side in the illustrated embodiment, is formed open. The arc extinguishing mechanism (200) can be accommodated in the arc extinguishing space (120) through the said side.

[0081] The Soh space (120) is defined as a part of the space formed inside the frame body (110). In the illustrated embodiment, the Soh space (120) may be defined as the upper part of the space formed inside the frame body (110), specifically the upper part in the front direction and the upper part in the length direction.

[0082] The arc extinguishing space (120) may be of any shape capable of accommodating the arc extinguishing mechanism (200). In the illustrated embodiment, the arc extinguishing space (120) is formed as a polygonal prism-shaped space having a length in the front-rear direction, a width in the left-right direction, and a height in the up-down direction.

[0083] A movable assembly (400) is movably accommodated in the lower side of the arc space (120). The movable assembly (400) can be moved by being coupled with a shaft assembly (500) while positioned in the lower side of the arc space (120).

[0084] Multiple arc extinguishing spaces (120) may be formed. Each of the multiple arc extinguishing spaces (120) may accommodate multiple arc extinguishing mechanisms (200).

[0085] In the illustrated embodiment, a total of four arc extinguishing spaces (120) are formed to accommodate a first arc extinguishing mechanism (200a), a second arc extinguishing mechanism (200b), a third arc extinguishing mechanism (200c), and a fourth arc extinguishing mechanism (200d), respectively. The plurality of arc extinguishing spaces (120) may be physically separated from one another by a part of a frame body (110) located between them.

[0086] The shape and number of arc extinguishing spaces (120) can be changed to correspond to the number and shape of the arc extinguishing mechanism (200).

[0087] The Soho space (120) is physically separated from the receiving space (130) by another part of the main body (110).

[0088] The receiving space (130) accommodates the mechanism (300) and the shaft assembly (500). The mechanism (300) and the shaft assembly (500) can be supported by the main body (110) so as to be movable or rotatable while accommodated in the receiving space (130).

[0089] The receiving space (130) is formed inside the main body (110). The receiving space (130) may be surrounded by the main body (110). The receiving space (130) may be located adjacent to the arc space (120) but may be physically separated from the arc space (120) by the main body (110). In the illustrated embodiment, the arc space (120) is located on one side in the longitudinal direction of the receiving space (130), i.e., the front side.

[0090] The receiving space (130) is defined as another part of the space formed inside the main body (110). In the illustrated embodiment, the receiving space (130) may be defined as the other side in the longitudinal direction of the space formed inside the main body (110), i.e., the rear side.

[0091] The receiving space (130) may be of any shape capable of movably or rotatably receiving the mechanism (300) and the shaft assembly (500). In the illustrated embodiment, the receiving space (130) is formed as a polygonal prism-shaped space having a length in the front-rear direction, a width in the left-right direction, and a height in the up-down direction.

[0092] The arc extinguishing mechanism (200) is configured to extinguish an arc generated inside the circuit breaker (10). When the fixed contact (not labeled in the drawing) and the movable contact (440) provided in the circuit breaker (10) are separated, an arc is generated. At this time, the arc extinguishing mechanism (200) is positioned adjacent to the fixed contact (not labeled in the drawing) and the movable contact (440) so as to extinguish and cool the generated arc.

[0093] The arc extinguishing mechanism (200) is coupled to the main frame (100). The arc extinguishing mechanism (200) can be housed in the arc extinguishing space (120) and supported by the main body (110). The arc extinguishing mechanism (200) can be exposed to the outside through an open portion of the arc extinguishing space (120), in the illustrated embodiment, the upper portion. The generated arc can be extinguished and cooled by the arc extinguishing mechanism (200) and then discharged to the outside of the circuit breaker (10).

[0094] The arc extinguishing mechanism (200) is located adjacent to the fixed contact (not labeled in the drawing) and the movable assembly (400). In the illustrated embodiment, the arc extinguishing mechanism (200) is located above the fixed contact (not labeled in the drawing) and the movable assembly (400) (see FIG. 13 and FIG. 14).

[0095] The arc extinguishing mechanism (200) is positioned adjacent to the mechanism (300). At this time, the arc extinguishing mechanism (200) may be separated from the mechanism (300) by a portion of the main body (110). In other words, the arc extinguishing mechanism (200) is positioned to face the mechanism (300) with the aforementioned portion of the main body (110) in between. In the illustrated embodiment, the arc extinguishing mechanism (200) is positioned above the front of the mechanism (300).

[0096] A plurality of arc extinguishing mechanisms (200) may be provided. A plurality of arc extinguishing mechanisms (200) are positioned adjacent to a plurality of fixed contacts (not shown) and movable contacts (440), respectively, to extinguish and cool the generated arc.

[0097] In the illustrated embodiment, the arc extinguishing mechanism (200) is provided with four parts, including a first arc extinguishing mechanism (200a), a second arc extinguishing mechanism (200b), a third arc extinguishing mechanism (200c), and a fourth arc extinguishing mechanism (200d).

[0098] The first arc extinguishing mechanism (200a), the second arc extinguishing mechanism (200b), the third arc extinguishing mechanism (200c), and the fourth arc extinguishing mechanism (200d) are each accommodated in a plurality of arc extinguishing spaces (120) and may be positioned adjacent to a plurality of fixed contacts (not shown) and movable contacts (440).

[0099] The first arc extinguishing mechanism (200a), the second arc extinguishing mechanism (200b), the third arc extinguishing mechanism (200c), and the fourth arc extinguishing mechanism (200d) differ in their placement locations, but their structure and function are identical. Accordingly, the common parts described below will be collectively referred to as the arc extinguishing mechanism (200), comprising the first arc extinguishing mechanism (200a), the second arc extinguishing mechanism (200b), the third arc extinguishing mechanism (200c), and the fourth arc extinguishing mechanism (200d).

[0100] In the embodiment illustrated in FIG. 6, the arc extinguishing mechanism (200) includes an arc extinguishing frame (210), an arc extinguishing cover (220), and a grid (230).

[0101] The arc extinguishing frame (210) forms part of the outer shape of the arc extinguishing mechanism (200). The arc extinguishing frame (210) can be combined with other components of the arc extinguishing mechanism (200) to support them. In the illustrated embodiment, the arc extinguishing frame (210) is combined with the arc extinguishing cover (220) and the grid (230) to support them. Alternatively, the arc extinguishing cover (220) and the grid (230) can be combined with each other via the arc extinguishing frame (210).

[0102] The Soho frame (210) is coupled with the Soho cover (220). One side of the Soho frame (210) in the height direction, the upper side in the illustrated embodiment, is coupled with the Soho cover (220). The Soho frame (210) is coupled with the grid (230). The inner side of the Soho frame (210) in the thickness direction is coupled with the grid (230).

[0103] The Soho frame (210) may be of any shape capable of being combined with and supporting the Soho cover (220) and grid (230), respectively. In the illustrated embodiment, the Soho frame (210) is a polygonal plate shape having a length in the front-rear direction, a height in the up-down direction, and a thickness in the left-right direction.

[0104] A plurality of Soh frames (210) may be provided. A plurality of Soh frames (210) may be spaced apart from each other and each may be combined with the Soh cover (220) and grid (230) at different locations. In the illustrated embodiment, a pair of Soh frames (210) are provided and spaced apart in the thickness direction, in the left-right direction in the illustrated embodiment.

[0105] The upper sides of a pair of Soh frames (210) are each connected to a Soh cover (220). A grid (230) is positioned between the pair of Soh frames (210). The pair of Soh frames (210) are connected to each end of the grid (230) in the longitudinal direction, and in the illustrated embodiment, in the left-right direction.

[0106] The arc extinguishing cover (220) constitutes another part of the exterior of the first arc extinguishing mechanism (200). The arc extinguishing cover (220) is a part of the first arc extinguishing mechanism (200) that is exposed to the outside of the main frame (100). A space communicating with the outside may be formed inside the arc extinguishing cover (220).

[0107] The Soho cover (220) can be combined with and supported by the Soho frame (210). Additionally, the Soho cover (220) can be combined with the grid (230) by covering one side in the height direction of the grid (230), i.e., the upper side.

[0108] The Soho cover (220) is combined with the Soho frame (210). One side of the Soho cover (220) in the height direction, the lower side in the illustrated embodiment, can be combined with and supported by the Soho frame (210). In an embodiment where a pair of Soho frames (210) are provided, each side of the lower side of the Soho cover (220) in the width direction, the left and right sides in the illustrated embodiment, can be combined with and supported by the pair of Soho frames (210), respectively.

[0109] The arc extinguishing cover (220) is coupled with the grid (230). The lower side in the height direction of the arc extinguishing cover (220) in the illustrated embodiment can be coupled with and supported by the grid (230). The arc extinguished and cooled while passing through the space between the plurality of grids (230) can be discharged to the outside of the circuit breaker (10) after passing through the internal space of the arc extinguishing cover (220).

[0110] At this time, a filter member (not shown), such as a mesh, may be provided in the space of the Soho cover (220). The filter member (not shown) can filter out foreign substances remaining in the extinguished and cooled arc.

[0111] The arc extinguishing cover (220) is combined with the arc extinguishing frame (210) and the grid (230), respectively, and may have any shape capable of forming a path through which the arc extinguished and cooled by the grid (230) is discharged to the outside. In the illustrated embodiment, the arc extinguishing cover (220) is a three-dimensional shape having a length in the front-rear direction that is longer than the width in the left-right direction and a height in the up-down direction.

[0112] The grid (230) effectively performs the role of extinguishing and cooling the generated arc. The generated arc extends along the grid (230) and can be extinguished and cooled. The arc extinguished and cooled by the grid (230) can pass through the arc extinguishing cover (220) and be discharged to the outside of the circuit breaker (10).

[0113] The grid (230) is combined with the Soh frame (210). Each side, left and right end of the grid (230) in the width direction can be combined and supported with a pair of Soh frames (210), respectively.

[0114] The grid (230) is combined with the Soho cover (220). One side of the grid (230) in the height direction, the upper side in the illustrated embodiment, is combined with the Soho cover (220) to support it.

[0115] The grid (230) can be formed of a magnetic material. This is so that the arc, which is a flow of electrons, can be rapidly extended toward the grid (230) to extinguish and cool.

[0116] The grid (230) is combined with the arc extinguishing frame (210) and the arc extinguishing cover (220), respectively, and may have any shape capable of extinguishing and cooling the arc. In the illustrated embodiment, the grid (230) is formed as a polygonal plate having a length in the left-right direction, a height in the up-down direction, and a thickness in the front-back direction.

[0117] A plurality of grids (230) may be provided. The plurality of grids (230) may be spaced apart from each other in the thickness direction, and in the front-rear direction in the illustrated embodiment. At this time, the generated arc may be divided in the space between the plurality of grids (230), extended along the grids (230), and extinguished and cooled.

[0118] At this time, as described above, the circuit breaker (10) according to the embodiment of the present invention can be configured such that the contact gap distance, that is, the travel distance of the movable contact (440), is increased. Accordingly, the number of grids (230) arranged along the travel path of the movable contact (440) can also be increased.

[0119] For example, a circuit breaker (10) according to an embodiment of the present invention may be configured to include 25 grids (230). On the other hand, a traditional circuit breaker may be equipped with only 20 grids.

[0120] Consequently, the circuit breaker (10) according to an embodiment of the present invention may have a larger number of grids (230) compared to a traditional circuit breaker. Accordingly, the arc extinguishing capability of the circuit breaker (10) may be improved.

[0121] The mechanism (300) provides power for the shaft assembly (500) to move. The mechanism (300) is coupled to the shaft assembly (500) to rotate the shaft assembly (500). As described below, the shaft assembly (500) is coupled to the movable assembly (400) to move or rotate the movable assembly (400).

[0122] Therefore, it can be said that the mechanism (300) provides power to move or rotate the movable assembly (400) and the shaft assembly (500).

[0123] The mechanism (300) is coupled to the main frame (100). The mechanism (300) may be received in a receiving space (130) and supported by the frame body (110). Some unillustrated components of the mechanism (300) may be exposed on the outside of the main frame (100). An operator may operate the mechanism (300) by operating the said components.

[0124] The mechanism (300) is coupled with the shaft assembly (500). The mechanism (300) can rotatably support the shaft assembly (500). As the mechanism (300) is operated, the shaft assembly (500) rotates, allowing the movable assembly (400) to move. A detailed description thereof will be provided later.

[0125] In the embodiment illustrated in FIG. 7, the mechanism (300) includes a mechanism frame (310) and a shaft coupling part (320).

[0126] The mechanism frame (310) forms the outer shape of the mechanism (300). The mechanism frame (310) is coupled with the shaft assembly (500). The mechanism frame (310) can rotatably support the shaft assembly (500). A shaft coupling portion (320) is formed inside the mechanism frame (310).

[0127] The mechanism frame (310) may be formed in any shape that constitutes the outer shape of the mechanism (300) and can rotatably support the shaft assembly (500). In the illustrated embodiment, the mechanism frame (310) is a three-dimensional shape having a length in the front-rear direction, a width in the left-right direction, and a height in the up-down direction.

[0128] In the above embodiment, various configurations for rotating the shaft assembly (500) may be located inside the mechanism frame (310).

[0129] A shaft coupling portion (320) is formed on one side in the longitudinal direction of the mechanism frame (310), in the illustrated embodiment, on the front side.

[0130] The shaft coupling portion (320) is configured such that the mechanism (300) is coupled to the shaft assembly (500). The shaft coupling portion (320) rotatably accommodates the shaft assembly (500). The shaft assembly (500) can be rotated in either a clockwise or counterclockwise direction while being accommodated in the shaft coupling portion (320) and supported by the mechanism frame (310).

[0131] The shaft coupling portion (320) is formed by being recessed into the mechanism frame (310). In the illustrated embodiment, the shaft coupling portion (320) is formed by being recessed into one side in the longitudinal direction of the mechanism frame (310), namely the front side.

[0132] The shaft coupling portion (320) may have any shape capable of rotatably accommodating the shaft assembly (500). In the illustrated embodiment, the shaft coupling portion (320) is formed as a space having a circular cross-section and a thickness in the left-right direction. At this time, one side of the shaft coupling portion (320), the front side in the illustrated embodiment, is formed open.

[0133] Multiple shaft coupling portions (320) may be formed. Multiple shaft coupling portions (320) may be formed at different locations so as to rotatably accommodate different parts of the shaft assembly (500). In the illustrated embodiment, a pair of shaft coupling portions (320) are formed, respectively, on the left and right parts of the mechanism frame (310).

[0134] The movable assembly (400) is configured such that the circuit breaker (10) is electrically connected to an external power source or load. The movable assembly (400) can be moved or rotated in a direction toward and opposite to a fixed contact (not given a reference numeral) provided on the main frame (100).

[0135] When the movable assembly (400) moves toward the fixed contact (not labeled in the drawing) and comes into contact with the fixed contact (not labeled in the drawing), the circuit breaker (10) can electrically connect the external power source and load. When the movable assembly (400) moves away from the fixed contact (not labeled in the drawing) and separates from the fixed contact (not labeled in the drawing), the circuit breaker (10) can electrically disconnect the external power source and load.

[0136] The movable assembly (400) is movably coupled to the main frame (100) and accommodated inside the main frame (100). The movable assembly (400) is exposed at least partially to the outside of the main frame (100). An external power source or load may be electrically connected to the movable assembly (400) by the said part of the movable assembly (400), that is, the part exposed to the outside of the main frame (100).

[0137] The movable assembly (400) is coupled to the main frame (100). The movable assembly (400) is movably accommodated in a space located on one side, i.e., the lower side, in the height direction of the arc extinguishing space (120) within the internal space of the main body (110). The space is connected to the arc extinguishing space (120), so that the generated arc can extend toward the arc extinguishing space (120). The movable assembly (400) can be positioned adjacent to the receiving space (130) and the mechanism (300) accommodated therein.

[0138] The movable assembly (400) is positioned adjacent to the arc extinguishing mechanism (200). In the illustrated embodiment, the movable assembly (400) is positioned below the arc extinguishing mechanism (200) housed in the arc extinguishing space (120). The arc generated as the movable assembly (400) moves can be extinguished and cooled by the arc extinguishing mechanism (200) housed in the arc extinguishing space (120) and then discharged to the outside.

[0139] The movable assembly (400) is positioned adjacent to the mechanism (300). The movable assembly (400) can be coupled to the mechanism (300) by a shaft assembly (500). Power applied by the mechanism (300) can be transmitted to the movable assembly (400) by the shaft assembly (500).

[0140] The movable assembly (400) is coupled with the shaft assembly (500). The movable assembly (400) can be moved by the rotation of the shaft assembly (500). At this time, as described below, the movable assembly (400) can be linked with the shaft assembly (500). Accordingly, the rotation of the shaft assembly (500) can be converted into movement or rotation of the movable assembly (400).

[0141] A plurality of movable assemblies (400) may be provided. A plurality of movable assemblies (400) may each be located on the lower side of a plurality of arc extinguishing mechanisms (200) and may each be coupled to a main frame (100) and a shaft assembly (500). A plurality of movable assemblies (400) may be moved or rotated together by the shaft assembly (500).

[0142] In the illustrated embodiment, the movable assembly (400) is provided with four movable assemblies, including a first movable assembly (400a), a second movable assembly (400b), a third movable assembly (400c), and a fourth movable assembly (400d).

[0143] The first movable assembly (400a), the second movable assembly (400b), the third movable assembly (400c), and the fourth movable assembly (400d) are each located below the first arc extinguishing mechanism (200a), the second arc extinguishing mechanism (200b), the third arc extinguishing mechanism (200c), and the fourth arc extinguishing mechanism (200d), and are each coupled to the main frame (100) and the shaft assembly (500).

[0144] The first movable assembly (400a), the second movable assembly (400b), the third movable assembly (400c), and the fourth movable assembly (400d) can be moved or rotated together by the shaft assembly (500).

[0145] The first movable assembly (400a), the second movable assembly (400b), the third movable assembly (400c), and the fourth movable assembly (400d) differ in their positions but have the same structure and function.

[0146] Accordingly, the common parts described below are collectively referred to as the first movable assembly (400a), the second movable assembly (400b), the third movable assembly (400c), and the fourth movable assembly (400d) as the movable assembly (400).

[0147] In the embodiment illustrated in FIGS. 8 to 12, the movable assembly (400) includes a movable body (410), a movable terminal (420), a finger member (430), and a movable contact (440).

[0148] The movable body (410) forms the outer shape of the movable assembly (400). The movable body (410) is combined with other components of the movable assembly (400) to support them. In the illustrated embodiment, the movable body (410) is combined with the movable terminal (420) and the finger member (430) to support them.

[0149] The movable body (410) is coupled to the shaft assembly (500). Specifically, the movable body (410) is coupled to a sub-link (540) provided in the shaft assembly (500). Accordingly, the movable assembly (400) is linked to the shaft assembly (500), so that the rotation of the shaft body (510) can be converted into movement or rotation of the movable body (410). In the illustrated embodiment, one side in the longitudinal direction of the movable body (410), namely the rear side, is coupled to the sub-link (540).

[0150] The movable body (410) is accommodated in the internal space of the main frame (100). The movable body (410) can be moved or rotated in the forward and backward directions, in the illustrated embodiment, in the direction opposite to the accommodation space (130) and in the direction toward the accommodation space (130). The movable body (410) is movably or rotatably coupled to the main body (110).

[0151] When the movable body (410) moves or rotates forward, the movable contact (440) comes into contact with the fixed contact (not labeled in the drawing), so that the external power source and load can be electrically connected to each other. When the movable body (410) moves or rotates backward, the movable contact (440) separates from the fixed contact (not labeled in the drawing), so that the external power source and load can be electrically disconnected from each other.

[0152] The movable body (410) is movably or rotatably coupled to the main frame (100) and may have any shape that can be coupled with other components of the movable assembly (400). In the illustrated embodiment, the movable body (410) is a three-dimensional shape having a length in the front-rear direction, a width in the left-right direction, and a height in the up-down direction.

[0153] A finger member (430) is attached to one side in the height direction of the movable body (410), the upper front side in the illustrated embodiment. The other side in the height direction of the movable body (410), the lower end in the illustrated embodiment, is rotatably attached to the main body (110).

[0154] A movable terminal (420) is coupled to the front side of the other side in the height direction of the movable body (410), and the front side of the lower side in the illustrated embodiment.

[0155] One side in the longitudinal direction of the movable body (410), the rear side in the illustrated embodiment, is coupled to a sub-link (540) of the shaft assembly (500). Accordingly, the rotation of the shaft assembly (500) and the movement or rotation of the movable assembly (400) can be coupled with each other.

[0156] The movable terminal (420) is a configuration in which the movable assembly (400) is electrically connected to an external power source or load. The movable terminal (420) is coupled to the main body (110) and is exposed to the outside of the main body (110).

[0157] The movable terminal (420) is coupled to the movable body (410). The movable terminal (420) is located on the front side of the other side in the height direction of the movable body (410), and on the front side of the lower side in the illustrated embodiment. The movable terminal (420) is exposed to the outside through an opening (not given a reference numeral) formed in the main body (110).

[0158] At this time, the movable terminal (420) may be rotatably coupled to the movable body (410). Additionally, the movable terminal (420) may be fixedly coupled to the main body (110). Thus, it will be understood that the movable body (410) rotates relative to the main body (110) and the movable terminal (420) fixedly coupled thereto.

[0159] The movable terminal (420) is electrically connected to the finger member (430). When the movable terminal (420) is electrically connected to an external power source and load, the finger member (430) can also be electrically connected to an external power source and load by the movable terminal (420).

[0160] The movable terminal (420) may be of any shape that can be electrically connected to an external power source or load. In the illustrated embodiment, the movable terminal (420) is in the shape of a disc having a circular cross-section and a thickness in the front-rear direction.

[0161] The finger member (430) supports the movable contact (440). The finger member (430) is electrically connected to the movable contact (440), which is formed in the shape of a protrusion. When the finger member (430) is electrically connected to the movable terminal (420), the movable contact (440) can also be electrically connected to the movable terminal (420).

[0162] The finger member (430) is coupled to the movable body (410). The finger member (430) is coupled to the front side of the one side in the height direction of the movable body (410). The finger member (430) extends in the height direction of the movable body (410), in the vertical direction in the illustrated embodiment.

[0163] A plurality of finger members (430) may be provided. The plurality of finger members (430) are spaced apart in the width direction of the movable body (410), and in the illustrated embodiment, in the left-right direction. The plurality of finger members (430) may each be coupled to a plurality of movable contacts (440) to be electrically connected.

[0164] Among the sides of the finger member (430), the side facing the fixed contact (not given a reference number) in the illustrated embodiment, the front side, is provided with a movable contact (440).

[0165] The movable contact (440) is configured such that the movable assembly (400) is electrically in contact with a fixed contact (not given a reference numeral) provided on the main frame (100). The movable contact (440) is formed protruding from one side of the finger member (430), in the illustrated embodiment, from the front side.

[0166] When the movable contact (440) is separated from the fixed contact (not given a reference numeral), the arc can be extended along the moving movable contact (440). As described above, the circuit breaker (10) according to the embodiment of the present invention is configured such that the travel distance of the movable contact (440) is increased. Accordingly, the arc extension length is also increased, thereby improving the arc extinguishing and cooling effects.

[0167] Multiple movable contacts (440) may be formed. Multiple movable contacts (440) may be formed on each of the multiple finger members (430) and may be in contact with and separated from each of the multiple fixed contacts (not given a reference number in the drawing).

[0168] Meanwhile, in the illustrated embodiment, the illustration of some finger members (430) and the movable contact (440) coupled thereto was omitted to indicate the partition (not given a drawing symbol) formed between the finger members (430).

[0169] That is, in the illustrated embodiment, five finger members (430) provided on the movable assembly (400) and movable contacts (440) coupled to the finger members (430) are provided and positioned to the left side of the movable body (410).

[0170] Alternatively, a total of ten finger members (430) and movable contacts (440) coupled thereto may be provided and each may be placed in the space between the partitions (not given a reference numeral). That is, the actual movable assembly (400) may be configured to further include a plurality of finger members (430) and movable contacts (440) spaced apart along the width direction of the movable body (410), i.e., the left-right direction.

[0171] The shaft assembly (500) transmits the rotational force of the mechanism (300) to the movable assembly (400). The shaft assembly (500) is rotatably coupled to the mechanism (300) and can rotate while coupled to the mechanism (300). Additionally, the shaft assembly (500) can be coupled to the movable assembly (400) to transmit rotational force.

[0172] The shaft assembly (500) can be linked with the movable assembly (400). Accordingly, the rotation of the shaft assembly (500) can be converted into movement or rotation of the movable assembly (400).

[0173] At this time, the configuration in which the shaft assembly (500) is coupled with the movable assembly (400) can be formed so that the movement or rotational distance of the movable assembly (400) can be increased. Accordingly, even without additional configuration, the movement or rotational distance of the movable assembly (400) can be increased solely by the coupling of the shaft assembly (500) and the movable assembly (400).

[0174] The shaft assembly (500) is coupled to the main frame (100). The shaft assembly (500) is rotatably received in the receiving space (130). The shaft assembly (500) is located adjacent to the lower front side of the part of the main body (110) that receives the movable assembly (400), in the illustrated embodiment.

[0175] The shaft assembly (500) is coupled to the mechanism (300). The shaft assembly (500) is rotatably received in the shaft coupling portion (320) and rotatably supported by the mechanism frame (310). The shaft assembly (500) is coupled to other components provided in the mechanism (300) and can be rotated by said components.

[0176] The shaft assembly (500) is coupled with the movable assembly (400). The shaft assembly (500) can be linked to the rear side of the movable body (410). The shaft assembly (500) is located between the mechanism (300) and the movable assembly (400).

[0177] In the embodiment again illustrated in FIGS. 8 to 12, the shaft assembly (500) includes a shaft body (510), a mechanism coupling part (520), a main link (530), a sub link (540), and a pin member (550).

[0178] The shaft body (510) is configured such that the shaft assembly (500) is coupled with the mechanism (300). The shaft body (510) is rotatably received in the shaft coupling portion (320) and rotatably supported by the mechanism frame (310).

[0179] The shaft body (510) is coupled with other components of the shaft assembly (500). In the illustrated embodiment, the shaft body (510) is coupled with the mechanism coupling part (520) and the main link (530), respectively.

[0180] The shaft body (510) may be any shape that is rotatably coupled to the mechanism (300) and can be coupled to other components of the shaft assembly (500) to rotate together. In the illustrated embodiment, the shaft body (510) is a cylindrical shape having a circular cross-section and a length in the left-right direction.

[0181] The mechanism coupling part (520) is a configuration in which the shaft assembly (500) is coupled to the mechanism (300). The rotational force applied by the configuration provided in the mechanism (300) can be transmitted to the shaft body (510) and the main link (530) coupled thereto through the mechanism coupling part (520).

[0182] The mechanism coupling part (520) is coupled with the above configuration provided in the mechanism (300).

[0183] The mechanism coupling part (520) is coupled to the shaft body (510). The mechanism coupling part (520) can rotate together with the shaft body (510). In the illustrated embodiment, the shaft body (510) is coupled through the mechanism coupling part (520) so that they can rotate together.

[0184] The mechanism coupling portion (520) is located adjacent to the mechanism (300). In the illustrated embodiment, the mechanism coupling portion (520) is located between the second movable assembly (400b) and the mechanism (300).

[0185] A plurality of mechanism coupling parts (520) may be provided. A plurality of mechanism coupling parts (520) may be spaced apart from each other and coupled to the shaft body (510) and the mechanism (300) respectively at different locations. In the illustrated embodiment, a pair of mechanism coupling parts (520) are provided and spaced apart in the longitudinal direction of the shaft body (510), i.e., in the left-right direction. A pair of mechanism coupling parts (520) face each other with the second main link (530b) in between.

[0186] The main link (530) is a component that mediates the link connection between the shaft assembly (500) and the movable assembly (400). The main link (530) can be rotatably connected to the sub-link (540) by a pin member (550). That is, the main link (530) functions as a link in the link connection between the shaft assembly (500) and the movable assembly (400).

[0187] The main link (530) is coupled to the shaft body (510). The main link (530) can rotate together with the shaft body (510). In the illustrated embodiment, a through hole is formed inside the main link (530) so that the shaft body (510) can be coupled to the main link (530) through it.

[0188] The main link (530) is coupled with the sub link (540). Specifically, the main link (530) can be rotatably coupled with the sub link (540) by a pin member (550).

[0189] The main link (530) is coupled with the shaft body (510) and rotates together, and may have any shape that can be linked with the sub link (540). In the illustrated embodiment, the main link (530) is formed as a polygonal plate shape having a length in the vertical direction longer than the width in the front-back direction and a thickness in the left-right direction.

[0190] At this time, one end in the longitudinal direction of the main link (530), the upper end in the illustrated embodiment, can be coupled with the shaft body (510). The other end in the longitudinal direction of the main link (530), the lower end in the illustrated embodiment, is rotatably coupled with the sub-link (540) by a pin member (550).

[0191] The main link (530) may be extended by a predetermined length, namely a first length (L1). The first length (L1) may be formed to be longer than the second length (L2), which is the length of the sub-link (540). In one embodiment, the first length (L1) may be at least twice the second length (L2). For example, the ratio of the first length (L1) to the second length (L2) may be 2.06. In the above embodiment, if the first length (L1) is 70 mm, the second length (L2) may be 34 mm.

[0192] Accordingly, the movable contact (440) can be moved further by a distance corresponding to the difference between the first length (L1) and the second length (L2). Consequently, the travel distance of the movable contact (440) can also be increased by the increased length of the main link (530).

[0193] A plurality of main links (530) may be provided. Each of the plurality of main links (530) may be coupled to a shaft body (510) and may be rotatably coupled to each of the plurality of pin members (550).

[0194] In the illustrated embodiment, the main link (530) is provided with four links, including a first main link (530a), a second main link (530b), a third main link (530c), and a fourth main link (530d).

[0195] The first main link (530a), the second main link (530b), the third main link (530c), and the fourth main link (530d) are each coupled to the first sub link (540a), the second sub link (540b), the third sub link (540c), the fourth sub link (540d), and the shaft body (510). The first main link (530a), the second main link (530b), the third main link (530c), and the fourth main link (530d) can be rotated together.

[0196] The sub-link (540) is another component mediating the link connection between the shaft assembly (500) and the movable assembly (400). The sub-link (540) is rotatably connected to the main link (530) by a pin member (550). That is, the sub-link (540) functions as another link in the link connection between the shaft assembly (500) and the movable assembly (400).

[0197] The sub-link (540) is coupled to the movable body (410). Specifically, the sub-link (540) is rotatably coupled to the rear side of the movable body (410). The movable body (410) and the sub-link (540) can be rotated relative to each other.

[0198] The sub-link (540) is coupled to the main link (530). Specifically, the sub-link (540) is rotatably coupled to the main link (530) by a pin member (550). The sub-link (540) can be linked by the main link (530), which rotates together with the shaft body (510).

[0199] The sub-link (540) may have any shape that can be rotatably coupled to the movable body (410) and the main link (530), respectively. In the illustrated embodiment, the sub-link (540) is formed as a polygonal plate shape having a length in the vertical direction that is longer than the width in the front-back direction and a thickness in the left-right direction.

[0200] At this time, one end in the longitudinal direction of the sub-link (540), the upper end in the illustrated embodiment, can be rotatably coupled to the rear side of the movable body (410). Additionally, the other end in the longitudinal direction of the sub-link (540), the lower end in the illustrated embodiment, is rotatably coupled to the main link (530) by a pin member (550).

[0201] The sub-link (540) can be extended by a predetermined length, namely a second length (L2). As described above, the second length (L2) can be formed to have a value less than or equal to half the first length (L1).

[0202] A plurality of sub-links (540) may be provided. Each of the plurality of sub-links (540) may be rotatably coupled to a plurality of movable assemblies (400) and a plurality of main links (530).

[0203] In the illustrated embodiment, four sub-links (540) are provided, including a first sub-link (540a), a second sub-link (540b), a third sub-link (540c), and a fourth sub-link (540d).

[0204] The first sub-link (540a), the second sub-link (540b), the third sub-link (540c), and the fourth sub-link (540d) are each rotatably coupled to the first movable assembly (400a), the second movable assembly (400b), the third movable assembly (400c), and the fourth movable assembly (400d), and to the first main link (530a), the second main link (530b), the third main link (530c), and the fourth main link (530d), respectively.

[0205] The pin member (550) mediates the connection of the main link (530) and the sub link (540). The main link (530) and the sub link (540) can be rotatably connected to each other by the pin member (550). That is, the pin member (550) functions as a joint connecting the main link (530) and the sub link (540).

[0206] The pin member (550) is coupled to the main link (530) and the sub link (540), respectively. The pin member (550) may be provided in any shape capable of rotatably coupling the main link (530) and the sub link (540). In the illustrated embodiment, the pin member (550) is a cylindrical shape having a circular cross-section and a length in the left-right direction, wherein the cross-sectional area of ​​each end in the length direction, i.e., each end in the left-right direction, is formed to be larger than that of other parts.

[0207] A plurality of pin members (550) may be provided. A plurality of pin members (550) can each rotatably connect a plurality of main links (530) and sub links (540). In the illustrated embodiment, four pin members (550) are provided and each is connected to four main links (530) and sub links (540).

[0208]

[0209] Referring again to FIGS. 11 and 12 and FIGS. 13 to 14, the operating state of a circuit breaker (10) according to an embodiment of the present invention is illustrated as an example.

[0210] The state illustrated in FIGS. 11 to 13 can be defined as a first state (P1). The first state (P1) can be defined as a state in which the movable contact (440) is maximally separated from the fixed contact (not labeled in the drawing). In other words, the first state (P1) is a state in which the movable contact (440) is moved to the rear side so that the external power source and load are electrically cut off.

[0211] In the first state (P1), the angle between the main link (530) and the sub link (540) can be defined as the first angle (α1). In the first state (P1), the main link (530) and the sub link (540) can be understood as being folded toward each other.

[0212] In the first state (P1), the main link (530) can be positioned closest to the movable body (410). The first angle (α1) can be an acute angle. In one embodiment, the first angle (α1) can be 51°.

[0213] At this time, the distance between the fixed contact (not labeled in the drawing) and the movable contact (440) can be defined as the travel distance (d). That is, the travel distance (d) can be defined as the distance that the movable contact (440) must move to contact the fixed contact (not labeled in the drawing) and conduct electricity, i.e., the gap distance. In one embodiment, the travel distance (d) may be 61.7 mm.

[0214] Additionally, the state illustrated in FIG. 14 can be defined as a second state (P2). The second state (P2) can be defined as a state in which the movable contact (440) is in contact with the fixed contact (not labeled in the drawing). In other words, the second state (P2) is a state in which the movable contact (440) is in contact with the fixed contact (not labeled in the drawing) and the external power source and load are electrically connected.

[0215] In the second state (P2), the angle between the main link (530) and the sub link (540) can be defined as the second angle (α2). In the second state (P2), the main link (530) and the sub link (540) can be understood as being spread out relative to each other.

[0216] In the second state (P2), the main link (530) may be positioned furthest from the movable body (410). The second angle (α2) may be an obtuse angle. In one embodiment, the second angle (α2) may be formed to have a size at least three times that of the first angle (α1). For example, the second angle (α2) may be 166.5°.

[0217] In the second state (P2), it will be understood that the movable contact (440) has been moved forward by a distance (d) to come into contact with the fixed contact (not labeled in the drawing).

[0218] At this time, the circuit breaker (10) according to the embodiment of the present invention may have a travel distance (d) of about 20 mm or more compared to a traditional circuit breaker. Accordingly, the insulation performance of the circuit breaker (10) is improved, and damage to the fixed contact (not given a reference numeral) or the movable contact (440) can be further prevented.

[0219] Additionally, the number of multiple grids (230) spaced apart along the path of the movable contact (440) can also be increased. Accordingly, the arc extinguishing and cooling effects are also improved, and the arc extinguishing performance can also be improved.

[0220]

[0221] Although embodiments of the present invention have been described, the spirit of the present invention is not limited to the embodiments presented in this specification. Those skilled in the art who understand the spirit of the present invention may easily propose other embodiments within the scope of the same spirit by adding, changing, deleting, or adding components, and such embodiments shall also be considered to fall within the scope of the spirit of the present invention.

[0222] 10: Circuit breaker 100: Main frame

[0223] 110: Frame body 120: Soho space

[0224] 130: Accommodation space 200: Arc SOHO fixture

[0225] 200a: First arc extinguishing device 200b: Second arc extinguishing device

[0226] 200c: 3rd arc extinguishing device 200d: 4th arc extinguishing device

[0227] 210: Soho Frame 220: Soho Cover

[0228] 230: Grid 300: Mechanism

[0229] 310: Mechanism frame 320: Shaft coupling part

[0230] 400: Movable assembly 400a: First movable assembly

[0231] 400b: 2nd movable assembly 400c: 3rd movable assembly

[0232] 400d: 4th movable assembly 410: movable body

[0233] 420: Operating terminal 430: Finger missing

[0234] 440: Movable contact 500: Shaft assembly

[0235] 510: Shaft body 520: Mechanism coupling part

[0236] 530: Main Link 530a: 1st Main Link

[0237] 530b: 2nd Main Link 530c: 3rd Main Link

[0238] 530d: 4th main link 540: Sub link

[0239] 540a: 1st sub-link 540b: 2nd sub-link

[0240] 540c: 3rd sub-link 540d: 4th sub-link

[0241] 550: Pin missing P1: First state

[0242] P2: Second state L1: First length

[0243] L2: Second length α1: First angle

[0244] α2: Second angle d: Distance traveled

Claims

1. A main frame having a space formed inside and a fixed contact located in the space; A movable assembly rotatably accommodated in the space of the main frame; A mechanism that is accommodated in the space of the main frame, arranged to face the fixed contact with the movable assembly in between, and applies power to the movable assembly; and It includes a shaft assembly that is coupled with the above mechanism to receive the power and is link-fitted with the movable assembly to transmit the power to the movable assembly. The above shaft assembly is, A main link that is rotated by the above mechanism and extended by a first length; and It includes a sub-link that is rotatably coupled to the main link and the movable assembly, respectively, and extends by a second length, The first length is at least twice the second length, Circuit breaker.

2. In Paragraph 1, The ratio of the first length and the second length is 2.06, Circuit breaker.

3. In Paragraph 1, The above-mentioned movable assembly is, A movable body rotatably coupled to the above sub-link; A finger member coupled to one end in the height direction of the above-mentioned movable body; and A movable contact formed protruding from one surface of the finger member facing the fixed contact, Circuit breaker.

4. In Paragraph 3, The above-mentioned movable assembly is, A first state in which the above-mentioned movable contact is positioned apart from the above-mentioned fixed contact by a travel distance; and The above movable contact is positioned in any one of the second states in which it contacts the above fixed contact, Circuit breaker.

5. In Paragraph 4, In the first state above, the first angle, which is the angle between the main link and the sub link, is, Less than the second angle, which is the angle between the main link and the sub link in the above second state Circuit breaker.

6. In Paragraph 5, The size of the second angle is at least three times the size of the first angle, Circuit breaker.

7. In Paragraph 6, The first angle is 51° and the second angle is 166.6°, Circuit breaker.

8. In Paragraph 1, The above shaft assembly is, A shaft body coupled to the main link above and rotating together, and rotatably coupled to the mechanism above; and A mechanism coupling part that is coupled to the shaft body and rotates together with it, and is coupled to the mechanism and receives the power. Circuit breaker.

9. In Paragraph 8, The above-mentioned movable assemblies are provided in multiple numbers, and the multiple movable assemblies are spaced apart along the width direction of the main frame, and The shaft body extends along the width direction of the main frame, and The above main link is provided in a plurality, and the plurality of main links are spaced apart from each other along the extension direction of the shaft body. Circuit breaker.

10. In Paragraph 9, The above sub-links are provided in plurality, and the plurality of sub-links are each rotatably coupled to a plurality of the movable assemblies and a plurality of the main links. Circuit breaker.

11. In Paragraph 1, A device comprising an arc extinguishing mechanism coupled to the main frame and positioned adjacent to the fixed contact and the movable assembly, Circuit breaker.

12. In Paragraph 11, The above-mentioned movable assembly is coupled to the main frame so as to be movable along the longitudinal direction of the main frame, and The above arc extinguishing mechanism is, A plurality of grids positioned adjacent to the fixed contact and the movable assembly, and spaced apart from each other along the longitudinal direction of the main frame, Circuit breaker.

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