Fixed contact portion and circuit breaker including same

Abstract

The invention discloses a fixed contact part and a circuit breaker including the same. A fixed contact part of one aspect of the present invention may comprise: a fixed contact table electrically connected to an external power source or load; a fixed contact coupled to the fixed contact base and in contact with the movable contact; and an arc flow path positioned on one side in the height direction of the fixed contact table and configured to guide the generated arc. The fixed contact table may include: a first extension portion extending in a direction; and a second extension portion continuous with the first extension portion at a predetermined angle. The arc runner may be disposed and supported on the second extension.

Description

Technical Field

[0001] The present invention relates to a fixed contact portion and a circuit breaker including the fixed contact portion, and more particularly, to a fixed contact portion having a structure capable of improving assembly convenience and stably maintaining an assembled state, and a circuit breaker including the fixed contact portion. Background Art

[0002] The circuit breaker can prevent damage to the power supply and the load by energizing the power supply and the load respectively. The circuit breaker is provided with a plurality of contacts that can be contacted or separated from each other.

[0003] When the multiple contacts are in contact, the external power source and load can be energized, allowing current to flow. If an abnormal current is detected, the multiple contacts separate. This disconnects the power supply and load, preventing damage to the power source and load caused by the abnormal current.

[0004] Some of the contacts are fixed at specific locations. These contacts are called "fixed contacts." The remaining contacts are movable toward and away from the fixed contacts. These contacts are called "movable contacts."

[0005] The fixed contact and the movable contact are respectively connected to other components exposed to the outside and are energized. An external power source and load can be energized to the fixed contact and the movable contact respectively through the other components.

[0006] Reference Figures 21 to 22 , shows a conventional connection terminal 1100 and an arc runner 1200 provided on a circuit breaker 1000 . The connection terminal 1100 shown includes an internal connection terminal 1110 and an external connection terminal 1120 .

[0007] The internal connection terminal 1110 is housed inside the circuit breaker 10 and is electrically connected to the external connection terminal 1120 via the cover. The external connection terminal 1120 is exposed to the outside of the circuit breaker 10 and is electrically connected to a power source or a load.

[0008] Specifically, conventional circuit breaker 1000 is configured to function as a fixed contact for electrically connecting both internal terminal 1110 and external terminal 1120 to an external power source or load. Therefore, a structure is required to securely couple internal terminal 1110 and external terminal 1120 to each other and to the housing.

[0009] The circuit breaker 1000 is also provided with an arc flow path 1200 for guiding the generated arc to an extinguishing unit (not shown). The arc flow path 1200 is coupled to the internal terminal 1110 and is configured to guide the arc generated in the fixed contact (not shown) provided on the internal terminal 1110.

[0010] Therefore, a structure is required to maintain the connection between the arc runner 1200 and the internal terminal 1110. In the illustrated embodiment, the terminal connection end 1210 connected to the arc runner 1200 is inserted into the runner receiving groove 1111 formed in the internal terminal 1110.

[0011] That is, the internal terminal 1110 and the external terminal 1120 need to be manufactured separately, the flow channel receiving groove 1111 and the terminal coupling end 1210 need to be formed, and an additional process is required to couple the terminal coupling end 1210 to the flow channel receiving groove 1111. Therefore, the manufacturing process of the circuit breaker 1000 becomes complicated, and there is a risk of increased manufacturing cost and time.

[0012] Korean Utility Model Publication No. 20-2017-0003310 discloses a bracket for an air circuit breaker of an outlet type. Specifically, the bracket is used to connect a main circuit terminal to a base of the bracket without an additional fixing member.

[0013] However, the bracket disclosed in the prior art document only provides a solution for easily connecting the main circuit terminals. The prior art document only discloses a solution for easily connecting the main circuit terminals to the outer box, but does not provide a solution for easily connecting the main circuit terminals to other components, such as an arc runner.

[0014] Korean Patent No. 10-0914207 discloses an air circuit breaker that increases screw fastening points, arc movement, and arc extinguishing speed by utilizing a fixing protrusion provided on an arc flow path and a protrusion fixing mechanism that engages with and fixes the fixing protrusion.

[0015] However, the prior art document discloses that assembling the fixed contact and arc runner requires inserting a fixing protrusion provided on the arc runner into an insertion portion formed in a recessed portion of the fixed contact. Therefore, the prior art document fails to provide a solution for combining the fixed contact and arc runner with a simple structure.

[0016] Furthermore, the above-mentioned existing documents fail to provide a solution that can not only easily combine the fixed contact and the arc runner, but also easily combine the fixed contact and the arc runner with a cover and the like and stably maintain the combined state.

[0017] Korean Utility Model Publication No. 20-2017-0003310 (September 25, 2017)

[0018] Korean Patent No. 10-0914207 (August 27, 2009) Summary of the Invention

[0019] Problems to be solved by the invention

[0020] The present invention aims to solve the above-mentioned problem, and an object thereof is to provide a fixed contact portion having a structure capable of improving assembly convenience, and a circuit breaker including the fixed contact portion.

[0021] Another object of the present invention is to provide a fixed contact portion having a structure capable of simplifying an assembly process, and a circuit breaker including the fixed contact portion.

[0022] Another object of the present invention is to provide a fixed contact portion having a structure capable of stably maintaining a coupled state, and a circuit breaker including the fixed contact portion.

[0023] Another object of the present invention is to provide a fixed contact portion having a structure capable of connecting components to each other while minimizing the number of additional components for connection, and a circuit breaker including the fixed contact portion.

[0024] Still another object of the present invention is to provide a fixed contact portion having a structure capable of reducing manufacturing costs, and a circuit breaker including the fixed contact portion.

[0025] The objects of the present invention are not limited to the above-mentioned contents, and other objects not mentioned can be clearly understood by those skilled in the art from the following description.

[0026] Technical solutions to the problem

[0027] According to one aspect of the present invention, a fixed contact portion is provided, comprising: a fixed contact base electrically connectable to an external power source or load; a fixed contact coupled to the fixed contact base and in contact with a movable contact; and an arc flow path located on one side in a height direction of the fixed contact base and configured to guide a generated arc; the fixed contact base comprising: a first extension extending in a direction; and a second extension continuous with the first extension at a predetermined angle; the arc flow path being mounted on and supported by the second extension.

[0028] In this case, a fixed contact portion may be provided, wherein the fixed contact stage further includes an arc flow channel support portion protruding from an end portion of the second extension portion toward one end portion of the arc flow channel to support the arc flow channel.

[0029] Furthermore, a fixed contact portion may be provided, including a gas generating member configured to generate gas by chemically reacting with heat; the gas generating member being housed in the arc flow channel and supported by the arc flow channel.

[0030] At this time, a fixed contact portion can be provided, in which the gas-producing component includes: a gas-producing body, accommodated in the arc flow channel; and a gas-producing arm, extending from the end of the gas-producing body toward one end of the fixed contact platform and surrounding the second extension portion; the fixed contact platform also includes a gas-producing component accommodating groove, which is recessed and formed in the end of the second extension portion toward one end of the gas-producing component to accommodate at least a portion of the gas-producing arm.

[0031] In addition, a fixed contact portion may be provided in which the gas producing member accommodating groove is recessedly formed at an edge of the one end portion of the second extending portion.

[0032] At this time, a fixed contact portion can be provided, comprising a gas-producing component configured to chemically react with heat to generate gas and housed inside the arc flow channel and supported by the arc flow channel; the arc flow channel comprises: an arc flow channel body, arranged to overlap with the gas-producing component; and an arc flow channel arm, extending from the end of the arc flow channel body toward one end of the fixed contact platform and surrounding the second extension portion; the fixed contact platform also comprises an arc flow channel accommodating groove, the arc flow channel accommodating groove being recessed in the end of the second extension portion toward one end of the arc flow channel to accommodate at least a portion of the arc flow channel arm.

[0033] In addition, a fixed contact portion may be provided, wherein the arc flow path accommodating groove is recessed and formed at an edge of the one end portion of the second extending portion.

[0034] At this time, a fixed contact part can be provided, and the gas-producing component includes: a gas-producing body, which is accommodated in the arc flow channel; and a gas-producing arm, which extends from the end of the gas-producing body toward one end of the fixed contact platform and surrounds the second extension portion; the fixed contact platform also includes a gas-producing component accommodating groove, which is recessed in the one end of the second extension portion to accommodate at least a portion of the gas-producing arm and is connected to the arc flow channel accommodating groove.

[0035] In addition, a fixed contact portion can be provided, wherein the arc flow channel includes: a first arc flow channel body, extending along the height direction of the fixed contact platform; a second arc flow channel body, extending along the one direction at a specified angle to the first arc flow channel body; a third arc flow channel body, extending along the height direction of the fixed contact platform at a specified angle to the second arc flow channel body to face the first arc flow channel body; and an accommodating space, formed to be surrounded by the first arc flow channel body, the second arc flow channel body and the third arc flow channel body.

[0036] In this case, a fixed contact portion may be provided, wherein the third arc runner body extends obliquely toward the first arc runner body.

[0037] In addition, a fixed contact portion can be provided, comprising a gas-producing component configured to chemically react with heat to generate gas and housed inside the arc flow channel and supported by the arc flow channel; the gas-producing component comprises: a gas-producing body formed so that its width is longer than the width of the second arc flow channel body and housed in the housing space; and a gas-producing arm extending from an end portion of the gas-producing body toward one end portion of the fixed contact platform and surrounding the second arc flow channel body in the width direction.

[0038] At this time, a fixed contact portion may be provided, wherein the gas producing component further comprises an arc flow channel accommodating groove, which is recessed in a surface of the gas producing body facing the third arc flow channel body to accommodate the third arc flow channel body.

[0039] Furthermore, according to one aspect of the present invention, a circuit breaker may be provided, comprising: a frame having a space formed therein; a cover covering the space and coupled to the frame; and a fixed contact portion accommodated in the space, coupled to the cover and partially exposed to the outside, for electrically connecting to an external power source or load; the fixed contact portion comprising: a fixed contact base extending through the cover and partially exposed to the outside; and an arc flow path located above the fixed contact base and configured to guide a generated arc to the outside; the cover comprising: a contact base accommodating space recessed on a surface of the cover facing the frame, accommodating a portion of the fixed contact base and the arc flow path; and a contact base through-hole extending through the interior of the contact base accommodating space and coupled to the fixed contact base.

[0040] In this case, a circuit breaker can be provided, wherein the fixed contact platform includes: a first extension portion extending in one direction, penetrating the contact platform through-hole and partially exposed to the outside; and a second extension portion located in the contact platform accommodating space and extending in a direction opposite to the arc flow path at a predetermined angle to the first extension portion; the arc flow path surrounds a portion of the second extension portion.

[0041] In addition, a circuit breaker can be provided, wherein the arc flow channel includes: a first arc flow channel body, which is in contact with the one side of the cover body and extends in another direction; a second arc flow channel body, which forms a specified angle with the first arc flow channel body and extends in a direction toward the frame; a third arc flow channel body, which forms a specified angle with the second arc flow channel body and extends in the other direction, and the end of the third arc flow channel body in the extension direction is combined with the one side of the cover body; and an accommodating space, which is formed to be surrounded by the first arc flow channel body, the second arc flow channel body and the third arc flow channel body.

[0042] At this time, a circuit breaker can be provided, comprising a gas-producing component, wherein the gas-producing component is located on the upper side of the fixed contact platform and is combined with the cover body, and is configured to produce gas by chemically reacting with the heat generated when an arc is generated; the gas-producing component comprises: a gas-producing body accommodated in the accommodating space; and a pair of gas-producing arms extending from the lower end of the gas-producing body and surrounding the second extension portion and the second arc flow channel body in the width direction.

[0043] In addition, a circuit breaker can be provided, wherein the fixed contact platform further includes an arc flow channel support portion protruding from the upper end portion of the second extension portion; the arc flow channel support portion contacts a portion of the cover body that surrounds the contact platform through hole on the upper side; and the second extension portion contacts another portion of the cover body that surrounds the contact platform through hole on the lower side.

[0044] At this time, a circuit breaker can be provided, wherein the fixed contact platform further includes a cover body accommodating groove, wherein the cover body accommodating groove is formed by being recessed inwardly at a pair of edges located on the upper side of the first extension portion to accommodate a portion of the cover body; the portion of the cover body accommodated in the cover body accommodating groove is configured to support the first extension portion.

[0045] In addition, a circuit breaker can be provided, comprising a gas-producing component, wherein the gas-producing component is located on the upper side of the fixed contact platform and is combined with the cover body, and is configured to produce gas by chemically reacting with the heat generated when an arc is generated; the arc flow channel comprises an arc flow channel arm extending downward, and the arc flow channel arms are spaced from each other in the width direction so as to surround the second extension portion in the width direction; the gas-producing component comprises a gas-producing arm extending downward, and the gas-producing arms are spaced from each other in the width direction so as to surround the second extension portion in the width direction, and are arranged to overlap with the arc flow channel arm facing the cover body across the arc flow channel arm.

[0046] At this time, a circuit breaker can be provided, wherein the fixed contact platform includes: an arc flow channel accommodating groove, which is recessed at the upper edge of the second extension portion to accommodate the arc flow channel arm; and a gas producing component accommodating groove, which is located closer to the space of the frame than the arc flow channel accommodating groove, and is recessed at the upper edge of the second extension portion to accommodate the gas producing arm, and is connected to the arc flow channel accommodating groove.

[0047] Effects of the Invention

[0048] According to the above configuration, the fixed contact portion and the circuit breaker including the fixed contact portion according to the embodiment of the present invention can improve the ease of assembly.

[0049] The fixed contact portion includes a fixed contact base partially exposed to the outside of the circuit breaker to be electrically connected to an external power source or load. The fixed contact base may be combined with a fixed contact to make contact with or separate from a movable contact accommodated in the interior space of the frame.

[0050] In this case, the fixed contact platform can be formed as a whole. A portion of the fixed contact platform, namely, the first extension portion, passes through the cover and is partially exposed to the outside. The other portion of the fixed contact platform, namely, the second extension portion, is accommodated in a contact platform accommodation portion formed in the cover.

[0051] That is, simply by penetrating and joining the integral fixed contact base to the cover, the fixed contact portion can be electrically connected to an external power source or load and the movable contact accommodated in the frame.

[0052] Therefore, compared with a case where a plurality of fixed contact bases are formed and positioned outside and inside the cover, assembly convenience can be improved.

[0053] Furthermore, according to the above configuration, the fixed contact portion and the circuit breaker including the fixed contact portion according to the embodiment of the present invention can simplify the assembly process.

[0054] As described above, the fixed contact stage and the cover can be joined by passing the first extension portion through the contact stage through-hole formed in the cover. After the fixed contact stage is joined, the gas generating member and the arc flow channel provided on the fixed contact portion are fastened to the cover in a joined state.

[0055] Therefore, the assembly process of the fixed contact portion and the cover can be simplified.

[0056] Furthermore, according to the above configuration, the fixed contact portion and the circuit breaker including the fixed contact portion according to the embodiment of the present invention can stably maintain the coupled state.

[0057] The first extension portion, exposed to the outside of the cover, extends in the front-to-back direction. The second extension portion, housed in the contact platform housing, extends in the vertical direction at a predetermined angle relative to the first extension portion. When the first extension portion passes through the contact platform through-hole, the second extension portion contacts the inner surface of the cover and supports the first extension portion from below.

[0058] In one embodiment, an arc channel support portion may protrude from the upper end of the second extension portion. If the first extension portion passes through the contact platform through hole, the arc channel support portion will contact the inner surface of the cover and support the first extension portion on the upper side.

[0059] On the other hand, a cover receiving groove is formed in the edge of the first extension portion, a portion of the cover is received in the cover receiving groove, and supports the first extension portion at one side in the height direction.

[0060] Additionally, a gas generating component accommodating groove and an arc runner accommodating groove are formed on the edge of the second extension. The gas generating component accommodating groove accommodates a gas generating arm, and the arc runner accommodating groove accommodates an arc runner groove. In one embodiment, the gas generating arm and the arc runner groove can support the second extension.

[0061] Furthermore, a portion of the gas generating component is housed within a housing formed within the arc runner. The gas generating component is supported by the arc runner. In this case, the gas generating arm is positioned further inward than the arc runner arm, i.e., toward the frame. In other words, the gas generating component and the arc runner are coupled to each other in a manner that supports each other at different locations.

[0062] Thus, the components of the fixed contact portion can support each other, thereby stably maintaining their coupled state.

[0063] Furthermore, according to the above configuration, the fixed contact portion and the circuit breaker including the fixed contact portion according to the embodiment of the present invention can combine the components with each other while minimizing the number of additional components for combining.

[0064] As described above, the components of the fixed contact portion support and couple with each other, thereby stably maintaining the coupling state between the components of the fixed contact portion.

[0065] Furthermore, the fixed contact platform is connected to a contact platform through-hole formed in the cover. The fixed contact platform is supported on one side in the height direction by the gas-generating member and the arc runner. Therefore, the fixed contact platform can be supported at multiple locations by its own shape, the cover, the gas-generating member, and the arc runner.

[0066] Furthermore, the gas-generating component and the arc runner are arranged to overlap each other and include a gas fastening hole and an arc fastening hole through which a fastening member passes. The fastening member, which passes through the gas fastening hole and the arc fastening hole, is coupled to the housing fastening hole formed in the housing. In other words, the gas-generating component and the arc runner can be coupled to the housing solely via the fastening member.

[0067] Therefore, the fixed contact portion and the cover can be coupled together while minimizing the number of components for coupling.

[0068] Furthermore, according to the above configuration, the fixed contact portion and the circuit breaker including the fixed contact portion according to the embodiment of the present invention can reduce manufacturing costs.

[0069] As described above, the fixed contact stage penetrates the cover, partially exposed inside the frame and partially exposed outside the frame. In addition, the gas generating member and the arc flow path are simultaneously connected to the cover by fastening members and support the fixed contact stage.

[0070] Thereby, it is possible to simplify the joining process and reduce the number of components required for fastening, etc. Thereby, it is possible to save manufacturing cost and time.

[0071] The effects of the present invention are not limited to the above-described effects, but should be understood to include all effects that can be inferred from the detailed description of the present invention or the configuration of the invention described in the claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0072] Figure 1 and Figure 2 It is a perspective view showing a circuit breaker according to an embodiment of the present invention.

[0073] Figure 3 It shows Figure 1 and Figure 2 AA cross-sectional view of the circuit breaker.

[0074] Figure 4 and Figure 5 It shows Figure 1 and Figure 2 Exploded perspective view of the structure of a circuit breaker.

[0075] Figure 6 It shows the setting Figure 1 and Figure 2 A three-dimensional view of the fixed contact portion and cover of a circuit breaker.

[0076] Figure 7 It shows Figure 6 A three-dimensional view of the fixed contact portion.

[0077] Figure 8 It shows Figure 6 A side view of the fixed contact portion of FIG.

[0078] Figure 9 It shows Figure 6 A top view of the fixed contact portion.

[0079] Figure 10 and Figure 11 It shows the setting Figure 6 A three-dimensional view of the gas-generating component of the fixed contact part.

[0080] Figure 12 and Figure 13 It shows the setting Figure 6 A three-dimensional diagram of the arc flow path of the fixed contact part.

[0081] Figure 14 and Figure 15 It shows Figure 6 A three-dimensional view of the cover.

[0082] Figure 16 It shows Figure 14 and Figure 15 The main view of the cover body.

[0083] Figure 17 It shows Figure 14 and Figure 15 Rear view of the cover.

[0084] Figure 18 It shows Figure 6 A three-dimensional cross-sectional view of the connection relationship between the fixed contact portion and the cover body.

[0085] Figure 19 It shows Figure 6 A side sectional view showing the connection between the fixed contact portion and the cover body.

[0086] Figure 20 It shows Figure 6 A three-dimensional cross-sectional view of the connection relationship between the fixed contact portion and the cover body.

[0087] Figure 21 It is an exploded perspective view showing the connection relationship between the connection terminal and the arc flow path provided in the conventional circuit breaker.

[0088] Figure 22 It shows Figure 21 A side sectional view of the connection relationship between the circuit breaker terminal and the arc flow channel. DETAILED DESCRIPTION

[0089] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement the present invention. The present invention can be implemented in a variety of different forms and is not limited to the embodiments described herein. To clearly illustrate the present invention, portions not relevant to the description are omitted from the accompanying drawings. Identical or similar components are denoted by the same reference numerals throughout the specification.

[0090] The words and terms used in this specification and claims should not be limited to the conventional or dictionary meanings, but should be interpreted as meanings and concepts consistent with the technical ideas of the present invention based on the principle that the inventor has the right to define terms and concepts in order to best explain his invention.

[0091] Therefore, the embodiments described in this specification and the configuration shown in the accompanying drawings only correspond to a preferred embodiment of the present invention and cannot fully represent the technical concept of the present invention. When the present invention is applied for, the configuration may have multiple equivalent replacement schemes and variations.

[0092] In the following description, description of some components may be omitted to clarify the features of the present invention.

[0093] 1. Definition of terms

[0094] The term "connected" as used in the following description refers to one or more components being connected in a manner that allows fluid flow. In one embodiment, this connection can be achieved through components such as pipes, ducts, and tubing. In the following description, the term "connected" can also be used synonymously to mean "fluidically connected" between one or more components.

[0095] The term "energized" as used in the following description refers to one or more components being connected in a manner capable of transmitting current or electrical signals. In one embodiment, energization can be achieved through a wired method such as a wired component, or through a wireless method such as Bluetooth, Wi-Fi, or RFID (radio frequency identification). In one embodiment, energization can also include the meaning of "communication."

[0096] The term "fluid" mentioned in the following description refers to any substance that flows under the action of an external force and can be deformed in shape or volume. In one embodiment, the fluid can be a liquid such as water or a gas such as air.

[0097] The terms "upper side", "lower side", "left side", "right side", "front side" and "rear side" mentioned in the following description can refer to Figure 1 and Figure 6 The coordinate system shown can be understood.

[0098] 2. Description of the Configuration of the Circuit Breaker 10 According to the Embodiment of the Present Invention

[0099] Reference Figures 1 to 5 , showing a circuit breaker 10 according to an embodiment of the present invention. The circuit breaker 10 is electrically connected to an external power source and a load. In one embodiment, the circuit breaker 10 can be electrically connected to an external power source and a load via a wire member (not shown).

[0100] In one embodiment, the circuit breaker 10 of the embodiment of the present invention may be formed as an air circuit breaker (ACB). However, the features of the circuit breaker 10 and the fixed contact unit 400 and cover 500 included in the embodiment of the present invention described below can be applied to various types of circuit breakers, such as vacuum circuit breakers (VCBs) and molded case circuit breakers (MCCBs).

[0101] Since the process of the circuit breaker 10 allowing or cutting off the power supply between the external power supply and the load by respectively energizing the external power supply and the load is a well-known technology, a detailed description thereof will be omitted.

[0102] In the illustrated embodiment, the circuit breaker 10 includes a frame 100, an arc extinguishing member 200, a current-carrying portion 300, a fixed contact portion 400, and a cover 500. The fixed contact portion 400 and the cover 500 are described separately from the above configuration.

[0103] The frame 100 forms the outer shape of the circuit breaker 10. A space may be formed inside the frame 100 to accommodate other components of the circuit breaker 10. In the illustrated embodiment, the frame 100 accommodates the arc extinguishing member 200, the current carrying portion 300, the fixed contact portion 400, and the cover 500.

[0104] At this time, the arc extinguishing member 200 may be configured to be exposed to the outside of the frame 100. In the illustrated embodiment, the arc extinguishing member 200 is configured to be exposed to the upper side of the frame 100.

[0105] Alternatively, the conducting portion 300 and the fixed contact portion 400 may be configured to be exposed outside the frame 100. In the illustrated embodiment, a portion of the conducting portion 300 and the fixed contact portion 400 are configured so that a portion thereof is exposed to the rear side of the frame 100. An external power source and load are electrically connected to the conducting portion 300 and the fixed contact portion 400, respectively.

[0106] Furthermore, the cover 500 can be configured to be coupled to the frame 100 and exposed to the outside. In the illustrated embodiment, the cover 500 is coupled to the rear side of the frame 100. Parts of the conducting portion 300 and the fixed contact portion 400 can pass through the cover 500 and be exposed to the outside.

[0107] The frame 100 can have any shape that accommodates other components of the circuit breaker 10 and electrically connects these components to the outside. In the illustrated embodiment, the frame 100 has a quadrangular prism shape having a length in the front-to-back direction, a height in the top-to-bottom direction, and a width in the left-to-right direction.

[0108] The shape of the frame 100 may be changed according to the shape of the cover 500 .

[0109] An arc extinguishing member 200 is provided on one side in the height direction of the frame 100 , that is, an upper side in the illustrated embodiment.

[0110] The arc-extinguishing member 200 forms a path for extinguishing the arc generated by the separation of the movable contact 322 and the fixed contact 420 and discharging it to the outside of the circuit breaker 10. The arc-extinguishing member 200 is located adjacent to the fixed contact 420. The generated arc can be extended along the arc flow path 440 described later and extinguished by the arc-extinguishing member 200 and discharged to the outside.

[0111] The arc-extinguishing member 200 is housed in a space formed within the frame 100. One side of the arc-extinguishing member 200 is located adjacent to the fixed contact 420 housed within the space within the frame 100, while the other side of the arc-extinguishing member 200 is exposed to the outside of the frame 100. In the illustrated embodiment, the lower side of the arc-extinguishing member 200 is located adjacent to the fixed contact 420, while the upper side of the arc-extinguishing member 200 is exposed to the outside of the frame 100.

[0112] To this end, the arc-extinguishing member 200 may be located toward one side in the length direction of the frame 100 , ie, the rear side in the illustrated embodiment.

[0113] A plurality of arc extinguishing members 200 may be provided. The plurality of arc extinguishing members 200 may be spaced apart from each other so as to extinguish arcs generated between the plurality of fixed contacts 420 and the movable contact 322 , respectively.

[0114] In the illustrated embodiment, the arc-extinguishing components 200 include three components, namely, a first arc-extinguishing component 200a, a second arc-extinguishing component 200b, and a third arc-extinguishing component 200c. The first arc-extinguishing components 200a, the second arc-extinguishing components 200b, and the third arc-extinguishing components 200c are spaced apart from each other in the width direction of the frame 100, i.e., in the left-right direction. The first arc-extinguishing components 200a, the second arc-extinguishing components 200b, and the third arc-extinguishing components 200c are configured to extinguish arcs generated in the three pairs of movable contacts 322 and fixed contacts 420 and discharge them.

[0115] The arc extinguishing member 200 may have any shape capable of extinguishing and discharging the arc generated by the separation of the movable contact 322 and the fixed contact 420. In the illustrated embodiment, the arc extinguishing member 200 has a polygonal column shape having a rectangular cross section and a height in the vertical direction.

[0116] Although not referenced, the arc-extinguishing member 200 may include any structure capable of applying an attractive force to the generated arc. For example, the arc-extinguishing member 200 may include a plurality of grids spaced apart from each other, a frame for supporting the plurality of grids, a mesh for filtering the arc passing through the plurality of grids, and the like.

[0117] Since the structure and operation process of the arc-extinguishing member 200 are well-known technologies, their detailed description is omitted below.

[0118] The power supply unit 300 connects the circuit breaker 10 to an external power source and load. The power supply unit 300 can be electrically connected to either the external power source or the external load. This means that the other external power source or load can also be electrically connected to the fixed contact unit 400.

[0119] The conducting part 300 is coupled to the frame 100 . A portion of the conducting part 300 is fixedly coupled to the frame 100 , while the remaining portion of the conducting part 300 is rotatably coupled to the frame 100 .

[0120] A portion of the conducting unit 300 is housed within the interior of the frame 100 and is not exposed to the outside. The remaining components of the conducting unit 300 are connected to the portion and conduct electricity, and are exposed to the outside of the frame 100.

[0121] The energizing portion 300 is located adjacent to the arc extinguishing member 200. The arc elongated by the movement of the energizing portion 300 may be guided to the arc extinguishing member 200. In the illustrated embodiment, the energizing portion 300 is located at a lower side of the arc extinguishing member 200.

[0122] The conducting portion 300 is located adjacent to the fixed contact portion 400. A portion of the conducting portion 300 (i.e., the movable contact portion 320, described below) is movable toward and away from the fixed contact portion 400. This movement allows the movable contact 320 and the fixed contact 420 to come into contact and separate.

[0123] The conducting portion 300 is combined with the cover 500. Specifically, the other components of the conducting portion 300 may penetrate and be combined with the cover 500 and exposed to the outside.

[0124] The power-carrying portion 300 may be formed of a conductive material. In one embodiment, the power-carrying portion 300 may be formed of copper (Cu), aluminum (Al), or an alloy thereof.

[0125] A plurality of power supply sections 300 may be provided. The plurality of power supply sections 300 may be spaced apart from one another and electrically connected to an external power source and load. In the illustrated embodiment, the power supply sections 300 include a first power supply section 300a, a second power supply section 300b, and a third power supply section 300c. The first power supply section 300a, the second power supply section 300b, and the third power supply section 300c are spaced apart from one another along the width of the frame 100, or in the left-right direction in the illustrated embodiment.

[0126] The first, second, and third conducting portions 300a, 300b, and 300c are located adjacent to the first, second, and third arc-extinguishing members 200a, 200b, and 200c, respectively. Furthermore, the first, second, and third conducting portions 300a, 300b, and 300c are located adjacent to the first, second, and third fixed contact portions 400a, 400b, and 400c, respectively.

[0127] The number and arrangement of the current-carrying portions 300 may be changed in accordance with the number and arrangement of the arc-extinguishing members 200 and the fixed contact portions 400 .

[0128] In the illustrated embodiment, the power supply portion 300 includes a connection terminal 310 and a movable contact portion 320 .

[0129] The connection terminal 310 is the portion of the power supply unit 300 that is exposed to the outside and electrically connects to an external power source or load. The connection terminal 310 is located on one side of the frame 100 in the longitudinal direction, i.e., the rear side in the illustrated embodiment. The connection terminal 310 is formed to extend toward the one side, i.e., the rear side, so that one end of the connection terminal 310 is exposed outside the frame 100.

[0130] The connection terminal 310 is coupled to the housing 500. The connection terminal 310 is accommodated in a connection terminal coupling portion 520 formed in the housing 500. The rear side portion of the connection terminal 310 passes through the connection terminal through hole 522 and is exposed to the outside of the housing 500.

[0131] Thus, the connection terminal 310 does not move and can maintain a state of being coupled with the frame 100 and the cover 500. In other words, the connection terminal 310 is fixedly coupled with the frame 100 and the cover 500.

[0132] The connection terminal 310 can be in any shape that can be exposed outside the frame 100 and the housing 500 to electrically connect to an external power source or load. In the illustrated embodiment, the connection terminal 310 is in the shape of a square plate having a rectangular cross-section and extending in the front-to-back direction.

[0133] The other side of the connecting terminal 310 in the extending direction, that is, the front side in the illustrated embodiment, is located in the internal space of the frame 100. The other side of the connecting terminal 310 is electrically connected to the movable contact portion 320.

[0134] The movable contact portion 320 is configured to contact or separate from the fixed contact 420 to establish or cancel the energization state between the external power source and load and the circuit breaker 10 .

[0135] The movable contact unit 320 is movably accommodated within the interior space of the frame 100. In one embodiment, the movable contact unit 320 can be configured to rotate about any location within the interior space of the frame 100. In the illustrated embodiment, the movable contact unit 320 can rotate clockwise and contact the fixed contact 420. Alternatively, the movable contact unit 320 can rotate counterclockwise and separate from the fixed contact 420.

[0136] The movable contact portion 320 is coupled to the connection terminal 310. The movable contact portion 320 is electrically coupled to the connection terminal 310. As described above, the connection terminal 310 is fixedly coupled to the frame 100 and the cover 500, and the movable contact portion 320 is movably accommodated in the interior space of the frame 100.

[0137] Therefore, a portion of the movable contact portion 320 coupled to the connection terminal 310 and energized may be formed in a braided manner, thereby maintaining the coupled and energized state of the movable contact portion 320 and the connection terminal 310 regardless of the movement of the movable contact portion 320 .

[0138] In the illustrated embodiment, the movable contact portion 320 includes a movable contact base 321 and a movable contact 322 .

[0139] Movable contact base 321 forms a component of movable contact unit 320. Movable contact base 321 is electrically coupled to the portion of movable contact unit 320 (i.e., the portion where movable contact unit 320 is coupled to terminal block 310) and movable contact 322. This electrically connects terminal block 310 and movable contact 322.

[0140] Movable contact base 321 extends vertically in the illustrated embodiment between connection terminal 310 and fixed contact portion 400. One side of movable contact base 321 (the lower side in the illustrated embodiment) engages with the portion and conducts electricity. The other side of movable contact base 321 (the upper side in the illustrated embodiment) is located adjacent to fixed contact portion 400. Movable contact 322 is located adjacent to the other end of movable contact base 321.

[0141] The movable contact stage 321 can be configured to be rotatable about a portion in its extending direction as an axis. In the illustrated embodiment, the movable contact stage 321 can be rotatable about a portion below the center in its extending direction as a center.

[0142] The movable contact 322 contacts or separates from the fixed contact 420, thereby allowing or disconnecting power flow between the circuit breaker 10 and the external power source and load. Furthermore, when the circuit breaker 10 is energized with the external power source and load, if an abnormal current, such as an overcurrent, occurs, the movable contact 322 can separate from the fixed contact 420 due to electrical repulsion. This allows the generated arc to be guided to the arc extinguishing member 200, extinguished, and discharged to the outside.

[0143] Movable contact 322 is coupled to movable contact base 321 and energized. In the illustrated embodiment, movable contact 322 is located adjacent to the other end of movable contact base 321 in the direction of extension, i.e., the upper end. Movable contact 322 is located on the side of movable contact base 321 that faces fixed contact 420, which in the illustrated embodiment is the rear side.

[0144] Since the process of the circuit breaker 10 allowing or cutting off the power supply between the external power source and the load by the contact and separation between the movable contact 322 and the fixed contact 420 is a well-known technology, a detailed description thereof will be omitted.

[0145] 3. Description of the Fixed Contact Unit 400 and the Cover 500 in the Embodiment of the Present Invention

[0146] Refer again Figures 1 to 5 The circuit breaker 10 according to the embodiment of the present invention includes a fixed contact portion 400 and a cover 500 .

[0147] The fixed contact portion 400 can electrically contact or separate from the conducting portion 300. Due to this contact and separation, as described above, the circuit breaker 10 can allow or cut off the flow of power to the external power source and load. Furthermore, the fixed contact portion 400 can be configured to guide the arc generated when the conducting portion 300 separates toward the arc-extinguishing member 200.

[0148] The fixed contact unit 400 is coupled to the frame 100 and the cover 500. A portion of the fixed contact unit 400 may be located within the interior space of the frame 100 and may be in contact with or separated from the movable contact unit 320. The remaining portion of the fixed contact unit 400 may be exposed to the exterior of the frame 100 and the cover 500, thereby being electrically connected to an external power source or load.

[0149] In particular, the fixed contact unit 400 of the embodiment of the present invention is configured to perform the aforementioned functions with minimal components, thereby facilitating the manufacturing of the fixed contact unit 400 and the integration process with other components.

[0150] Furthermore, the fixed contact unit 400 of the embodiment of the present invention can stably maintain its connection with the components constituting the fixed contact unit 400 and other components of the circuit breaker 10. Therefore, even if the movable contact 322 and the fixed contact 420 separate, causing an arc and pressure to be generated, the connection can be stably maintained.

[0151] The fixed contact unit 400 is coupled to the frame 100. In the illustrated embodiment, the fixed contact unit 400 is located at the rear side of the frame 100. A portion of the fixed contact unit 400 is accommodated within the interior space of the frame 100. The remaining portion of the fixed contact unit 400 is exposed to the outside of the frame 100.

[0152] The fixed contact portion 400 is located adjacent to the arc extinguishing member 200. Starting from the fixed contact 420, an arc extending along the movable contact 322 away from the fixed contact 420 can be guided to the arc extinguishing member 200. In the illustrated embodiment, the fixed contact portion 400 is located on the lower side of the arc extinguishing member 200.

[0153] The fixed contact portion 400 is located adjacent to a portion of the current-carrying portion 300. In the illustrated embodiment, the fixed contact portion 400 is located above the connection terminal 310 and behind the movable contact portion 320. Rotating the movable contact portion 320 clockwise or counterclockwise can bring the movable contact 322 into contact with and separate from the fixed contact 420.

[0154] The fixed contact portion 400 is coupled to the cover 500. A portion of the fixed contact portion 400 exposed to the outside of the frame 100 may be coupled to and supported by the cover 500. In this case, a portion of the portion may penetrate the cover 500 and be exposed to the outside of the cover 500.

[0155] A plurality of fixed contact portions 400 may be provided. The plurality of fixed contact portions 400 may be coupled to the frame 100 and the cover 500 at different locations. In the illustrated embodiment, the fixed contact portions 400 include a first fixed contact portion 400a, a second fixed contact portion 400b, and a third fixed contact portion 400c. The first, second, and third fixed contact portions 400a, 400b, 400c are spaced apart from each other in the width direction of the frame 100, or in the left-right direction in the illustrated embodiment.

[0156] The first, second and third fixed contact portions 400a, 400b and 400c are respectively located adjacent to the first, second and third arc extinguishing members 200a, 200b and 200c and the first, second and third conducting portions 300a, 300b and 300c.

[0157] The number and arrangement of the fixed contact portions 400 may be changed according to the number and arrangement of the arc-extinguishing members 200 and the current-carrying portions 300 .

[0158] exist Figures 6 to 13 In the illustrated embodiment, the fixed contact portion 400 includes a fixed contact base 410 , a fixed contact 420 , a gas producing member 430 , an arc flow channel 440 , and a fastening member 450 .

[0159] The fixed contact base 410 forms one component of the fixed contact portion 400. The fixed contact base 410 is exposed to the outside of the frame 100 or the cover 500, and is electrically connected to an external power source or load.

[0160] Fixed contact base 410 is coupled to fixed contact 420 and energized. When fixed contact 420 contacts movable contact 322, fixed contact base 410 is electrically connected to movable contact base 321 and terminal 310. Thus, circuit breaker 10 allows external power and loads to be energized.

[0161] The fixed contact stage 410 may be formed of a conductive material. In one embodiment, the fixed contact stage 410 may be formed of copper, aluminum, or alloys thereof.

[0162] A portion of the fixed contact stage 410 is accommodated in a space formed inside the frame 100. In the illustrated embodiment, a portion of the front side of the fixed contact stage 410 is accommodated in the space formed inside the frame 100.

[0163] A portion of the fixed contact platform 410 is exposed outside the frame 100 and is coupled to the cover 500. The portion of the fixed contact platform 410 that is exposed outside the cover 500 passes through the cover 500 and is exposed outside the cover 500. In the illustrated embodiment, a portion of the rear side of the fixed contact platform 410 is exposed outside the cover 500.

[0164] In one embodiment, the fixed contact stage 410 can be formed from a single member. Specifically, the first extension 411 and the second extension 412, which form the outer shape of the fixed contact stage 410, can be formed integrally. Thus, a portion of the fixed contact stage 410 can be exposed to the interior of the frame 100, while another portion can be exposed to the exterior of the frame 100.

[0165] Therefore, the number of components required for the fixed contact portion 400 to conduct electricity to the outside can be reduced, and the fixed contact portion 400 and the cover 500 can be easily coupled together.

[0166] exist Figures 7 to 9 In the illustrated embodiment, the fixed contact stage 410 includes a first extension portion 411 , a second extension portion 412 , an arc flow channel support portion 413 , a limiting protrusion 414 , a cover receiving groove 415 , a gas generating component receiving groove 416 , and an arc flow channel receiving groove 417 .

[0167] The first extension portion 411 constitutes a portion of the main body of the fixed contact stage 410. The first extension portion 411 is the portion where the fixed contact stage 410 is coupled to the housing 500. Furthermore, the first extension portion 411 is the portion of the fixed contact stage 410 that is exposed to the outside of the housing 500 and electrically connects to an external power source or load.

[0168] The first extension portion 411 extends along the length of the frame 100, that is, the front-to-back direction in the embodiment shown. The extension direction of the first extension portion 411 can be understood as the direction in which the frame 100 and the cover body 500 are connected to or separated from each other.

[0169] The first extension portion 411 may have any shape that can penetrate the cover body 500 and be exposed to the outside of the cover body 500. In the illustrated embodiment, the first extension portion 411 may have a polygonal column shape in which its vertical height is shorter than its horizontal width and its front-to-back length is greater.

[0170] The shape of the first extension portion 411 may be changed to correspond to the shape of the contact platform coupling portion 530 formed on the cover 500 .

[0171] In the illustrated embodiment, a pair of surfaces extending along the length direction of the first extension portion 411 , namely, the left and right surfaces, are recessed to form cover receiving grooves 415 .

[0172] The first extension portion 411 is continuous with the second extension portion 412 at a predetermined angle therebetween. In one embodiment, the predetermined angle may be a right angle.

[0173] The second extension 412 forms another portion of the main body of the fixed contact stage 410. The second extension 412 is electrically coupled to the fixed contact 420. In other words, the second extension 412 can be defined as a portion where the fixed contact stage 410 and the movable contact portion 320 can electrically contact or separate.

[0174] The second extension portion 412 supports the fixed contact stage 410 coupled to the cover 500. That is, the second extension portion 412 may extend in a direction different from the direction in which the contact stage through-hole 532 penetrates, thereby preventing the first extension portion 411 from being detached from the contact stage through-hole 532.

[0175] The second extension portion 412 extends along the height direction of the first extension portion 411, or vertically in the embodiment shown, at a predetermined angle to the first extension portion 411. The second extension portion 412 may extend toward the connection terminal 310, ie, downward.

[0176] The second extension 412 may have any shape that is continuous with the first extension 411 and can stably maintain the connection between the fixed contact base 410 and the cover 500. In the illustrated embodiment, the second extension 412 has a polygonal column shape in which its front-to-back length is shorter than its left-to-right width and has a height in the top-to-bottom direction.

[0177] The second extension 412 is coupled to and energized with a fixed contact 420. The fixed contact 420 is coupled to a surface of the second extension 412 that faces the interior of the frame 100, which is the front side in the illustrated embodiment.

[0178] At each edge in the width direction of the end portion of the second extension portion 412 in the extension direction facing one end portion of the arc extinguishing member 200, a gas producing member accommodating groove 416 and an arc flow channel accommodating groove 417 are formed at the upper left and upper right edges of the upper end portion in the illustrated embodiment.

[0179] On the surface of the one end portion of the second extending portion 412 , that is, the upper side surface in the illustrated embodiment, the arc flow path supporting portion 413 protrudes in the height direction thereof.

[0180] Furthermore, on one side of the second extension portion 412 , namely, the front side in the illustrated embodiment, a restricting protrusion 414 is formed to protrude toward the inner space of the frame 100 , ie, toward the front side, away from the fixed contact 420 .

[0181] The arc flow channel support portion 413 supports the arc flow channel 440 coupled to the cover 500. The arc flow channel support portion 413 may be located at a lower side of the arc flow channel 440 and may be configured to support a lower end portion of the arc flow channel 440.

[0182] The arc channel support portion 413 is continuous with the second extension portion 412. The arc channel support portion 413 faces one end of the arc channel 440 on the surface of the second extension portion 412, and in the illustrated embodiment, the upper end portion thereof is formed to protrude upward.

[0183] The protruding length of the arc runner support portion 413 may be determined according to the relative position of the arc runner 440 and the fixed contact base 410. Specifically, the arc runner support portion 413 may protrude by the length between the lower end of the arc runner 440 coupled to the cover 500 and the upper end surface of the second extension portion 412.

[0184] Therefore, the lower side of the arc runner 440 coupled to the cover 500 is supported by the second extension portion 412, thereby stably maintaining the coupled state of the arc runner 440. Simultaneously, since the arc runner support portion 413 is pressed downward by the arc runner 440, the arc runner support portion 413 can maintain the predetermined angle relative to the contact base through-hole 532.

[0185] Therefore, it can be said that the arc flow channel support portion 413 can support the arc flow channel 440 while maintaining the connection state of the fixed contact base 410 .

[0186] In addition, the arc flow channel supporting portion 413 can limit the length of the first extending portion 411 passing through the contact platform through-hole 532 .

[0187] Specifically, as described above, the second extension portion 412 extends downward, thereby supporting the fixed contact base 410 from below. At this time, the arc flow path support portion 413 protrudes upward, thereby supporting the fixed contact base 410 from above. Specifically, the second extension portion 412 contacts the contact cover body 510 from below, while the arc flow path support portion 413 contacts the contact cover body 510 from above.

[0188] Thus, the length of the first extension portion 411 that passes through the contact platform through-hole 532 can be limited. In addition, the fixed contact platform 410 coupled to the contact platform through-hole 532 can be supported by the contact cover body 510 in the vertical direction.

[0189] The limiting protrusion 414 is located adjacent to the arc flow path supporting portion 413 .

[0190] Limiting protrusions 414 are configured to limit the movement distance of movable contact base 321. Movable contact base 321 can move toward fixed contact base 410 until it contacts limiting protrusions 414. This allows movable contact 322 to move toward fixed contact 420 until it contacts fixed contact 420 but not too tightly.

[0191] The restricting protrusion 414 is continuous with the second extension portion 412. The restricting protrusion 414 is formed to protrude forward from a surface of the second extension portion 412 toward the interior space of the frame 100 or a surface of the movable contact 322, that is, the front side surface in the illustrated embodiment.

[0192] The limiting protrusion 414 is located between the movable contact 322 and the arc flow path support portion 413. In the illustrated embodiment, the limiting protrusion 414 is located on the upper side of the movable contact 322 and on the lower side of the arc flow path support portion 413.

[0193] When the movable contact portion 320 rotates toward the fixed contact stage 410 so that the movable contact 322 contacts the fixed contact 420, the portion of the movable contact portion 320 that faces the cover 500, in the illustrated embodiment, and that is adjacent to the upper end, contacts the limiting protrusion 414. This limits the rotation angle of the movable contact portion 320, thereby preventing the movable contact 322 from coming into excessive contact with the fixed contact 420.

[0194] Therefore, when an abnormal current such as an overcurrent flows, the movable contact 322 and the fixed contact 420 can be quickly separated.

[0195] The cover receiving groove 415 receives a portion of the cover 500. The portion of the cover 500 received in the cover receiving groove 415 presses the fixed contact stage 410. Thus, the coupled state of the cover 500 and the fixed contact stage 410 can be stably maintained.

[0196] A cover receiving groove 415 is formed in the first extension portion 411. The cover receiving groove 415 is formed in an edge extending in the direction of extension of the first extension portion 411, and in the illustrated embodiment, is formed in a portion of the edge extending in the front-to-back direction. In the illustrated embodiment, the cover receiving groove 415 is formed such that the upper edge of the edge extending in the front-to-back direction of the first extension portion 411 is recessed radially inward.

[0197] The cover receiving groove 415 extends along the extension direction of the first extension portion 411 and along the front-to-back direction in the illustrated embodiment. At this time, the extension length of the cover receiving groove 415 can be shorter than the extension length of the first extension portion 411.

[0198] Thus, the portion of the first extending portion 411 that is in direct contact with the cover body 500 can be received in the cover body receiving groove 415 and contact and support the first extending portion 411 .

[0199] To this end, the cover receiving groove 415 may be formed in a shape corresponding to a portion of the facing cover 500. In the illustrated embodiment, the cover receiving groove 415 is formed to be surrounded by a surface extending obliquely toward the inner side of the first extension portion 411.

[0200] A plurality of cover receiving grooves 415 may be formed. The plurality of cover receiving grooves 415 may be formed on different edges of the first extension portion 411. In the illustrated embodiment, the cover receiving grooves 415 may be formed on a pair of upper edges of the four edges extending in the front-to-back direction of the first extension portion 411.

[0201] Gas generating member receiving groove 416 receives a portion of gas generating member 430 coupled to housing 500. The portion of gas generating member 430 received in gas generating member receiving groove 416 is configured to pressurize fixed contact stage 410. This allows the coupled state between fixed contact stage 410 and gas generating member 430 to be stably maintained.

[0202] A gas-generating member receiving groove 416 is formed in the second extension portion 412. The gas-generating member receiving groove 416 is formed in an edge extending in the longitudinal direction of the second extension portion 412, or in the illustrated embodiment, a portion of the edge extending in the front-to-back direction. In the illustrated embodiment, the gas-generating member receiving groove 416 is formed such that a portion of the upper edge of the edge extending in the front-to-back direction of the second extension portion 412 is recessed radially inward.

[0203] The gas generating member receiving groove 416 extends along the length of the second extension portion 412 , in the front-to-back direction in the illustrated embodiment. That is, the gas generating member receiving groove 416 may extend in the same direction as the cover receiving groove 415 .

[0204] The extended length of the gas generating member accommodating groove 416 may be determined according to the thickness of the gas generating member 430. In this case, the extended length of the gas generating member accommodating groove 416 may be shorter than the extended length of the second extension portion 412. Therefore, an arc flow channel accommodating groove 417 may be formed at another portion of the edge of the second extension portion 412.

[0205] The gas generating member accommodating groove 416 may be located adjacent to the arc runner accommodating groove 417. In the illustrated embodiment, the gas generating member accommodating groove 416 is located forward of the arc runner accommodating groove 417. The positional relationship between the gas generating member accommodating groove 416 and the arc runner accommodating groove 417 may be modified based on the positional relationship between the gas generating member 4230 and the arc runner 440.

[0206] The gas generating member accommodating groove 416 accommodates a gas generating member 430, namely a gas generating arm 432 described later. The gas generating arm 432 is arranged to cover the arc runner arm 444 accommodated in the arc runner accommodating groove 417 from the outside, or the front side in the illustrated embodiment.

[0207] Furthermore, the gas generating arm 432 accommodated in the gas generating member accommodation groove 416 applies pressure to one side of the second extension portion 412 surrounding the gas generating member accommodation groove 416, in the illustrated embodiment, the upper side. This stabilizes the connection between the gas generating member 430 and the fixed contact stage 410.

[0208] The gas generating member receiving groove 416 may be formed in a shape corresponding to the end shape of the gas generating arm 432. In the illustrated embodiment, the gas generating member receiving groove 416 is formed to be surrounded by a surface extending obliquely toward the inner side of the second extension portion 412.

[0209] A plurality of gas-generating member accommodating grooves 416 may be formed. The plurality of gas-generating member accommodating grooves 416 may be formed at different edges of the second extension portion 412. In the illustrated embodiment, the gas-generating member accommodating grooves 416 are formed at a pair of upper edges of the four edges extending in the front-to-rear direction of the second extension portion 412.

[0210] The gas generating member accommodating groove 416 is in communication with the arc flow path accommodating groove 417 .

[0211] The arc runner accommodating groove 417 accommodates a portion of the arc runner 440 coupled to the housing 500. The portion of the arc runner 440 accommodated in the arc runner accommodating groove 417 is configured to pressurize the fixed contact base 410. This allows the fixed contact base 410 and the arc runner 440 to be stably coupled.

[0212] An arc flow channel accommodating groove 417 is formed in the second extension portion 412. The arc flow channel accommodating groove 417 is formed in an edge extending in the longitudinal direction of the second extension portion 412, or in the illustrated embodiment, a portion of the edge extending in the front-to-back direction. In the illustrated embodiment, the arc flow channel accommodating groove 417 is formed by recessing a portion of the upper edge of the edge extending in the front-to-back direction of the second extension portion 412 radially inward.

[0213] The arc flow channel accommodating groove 417 extends along the length of the second extension portion 412 , in the front-to-back direction in the illustrated embodiment. That is, the arc flow channel accommodating groove 417 may extend in the same direction as the cover accommodating groove 415 and the gas generating member accommodating groove 416 .

[0214] The extended length of the arc runner accommodating groove 417 can be determined based on the thickness of the arc runner arm 444 of the arc runner 440. In this case, the extended length of the arc runner accommodating groove 417 can be shorter than the extended length of the second extension portion 412. Thus, both the arc runner accommodating groove 417 and the gas producing member accommodating groove 416 can be formed at the edge of the second extension portion 412.

[0215] The arc flow channel accommodating groove 417 may be located adjacent to and communicate with the gas producing component accommodating groove 416 . In the illustrated embodiment, the arc flow channel accommodating groove 417 is located behind the gas producing component accommodating groove 416 .

[0216] The other configurations of the fixed contact base 410 and the fixed contact portion 400 and the state in which the cover 500 is coupled will be described in detail later.

[0217] The fixed contact 420 contacts or separates from the movable contact 322. The circuit breaker 10 can electrically connect or disconnect an external power source and a load through the contact or separation.

[0218] The fixed contact 420 is coupled to the fixed contact base 410. Specifically, the fixed contact 420 is coupled to the side of the second extension 412 that faces the movable contact 322, which is the front side in the illustrated embodiment. The fixed contact 420 and the fixed contact base 410 are electrically connected.

[0219] The fixed contact 420 may be formed of a conductive material. In one embodiment, similar to the fixed contact stage 410 , the fixed contact 420 may be formed of aluminum or a metal material including aluminum.

[0220] The fixed contact 420 is located at a position separated from the limiting protrusion 414. In the illustrated embodiment, the fixed contact 420 is located on the lower side of the limiting protrusion 414. If the fixed contact 420 contacts the movable contact 322, the limiting protrusion 414 may contact the movable contact stage 321.

[0221] Since the process of the circuit breaker 10 electrically connecting or disconnecting an external power source and load by making the movable contact 322 contact and separating from the fixed contact 420 is a well-known technology, a detailed description thereof will be omitted.

[0222] The gas-generating member 430 chemically reacts with the heat generated during arcing to produce gas. This generated gas increases the pressure within the frame 100. The pressure difference between the interior and exterior of the frame 100 generates a force that propels the arc toward the arc-extinguishing member 200.

[0223] That is, the gas generating member 430 generates gas for rapidly moving the generated arc toward the arc extinguishing member 200 .

[0224] In addition, the gas generated by the gas generating member 430 can exchange heat with the arc, thereby also cooling the arc. The arc can be cooled by the generated gas and flow toward the arc extinguishing member 200.

[0225] Therefore, the generated arc can be sufficiently cooled and extinguished by the arc extinguishing member 200 and discharged to the outside of the circuit breaker 10. Thus, damage to the internal structure of the circuit breaker 10 or the arc extinguishing member 200 caused by heat generated when the arc is generated can be prevented.

[0226] The gas generating member 430 can be formed of any material that can chemically react with the heat generated during arcing to generate gas. In one embodiment, the gas generating member 430 can be formed of a thermoplastic synthetic resin material such as nylon. In this embodiment, the gas generating member 430 can react with the heat to generate a gas such as hydrogen or nitrogen.

[0227] The gas generating member 430 is coupled to the fixed contact stage 410. Specifically, one end of the gas generating member 430 in the height direction, in the illustrated embodiment, the lower end, is received in a gas generating member receiving groove 416 formed in the fixed contact stage 410 and supported by the fixed contact stage 410.

[0228] The gas generating member 430 is coupled to the arc runner 440. Specifically, the gas generating member 430 is accommodated in an accommodation space 446 provided in the arc runner 440. The arc runner 440 surrounds the gas generating member 430 on both sides in the thickness direction, including the front and rear sides in the illustrated embodiment.

[0229] The gas generating member 430 is coupled to the cover 500. Specifically, the gas generating member 430 is coupled to the cover 500 via the first arc runner body 441 located behind the arc runner 440. Thus, at least a portion of the gas generating member 430 is exposed to the interior space of the frame 100.

[0230] That is, from the perspective of the internal space of the frame 100 that accommodates the movable contact 322, one component of the arc flow channel 440 (i.e., the third arc flow channel body 443 described later), the gas producing component 430, and the other component of the arc flow channel 440 (i.e., the first arc flow channel body 441 described later) are arranged in sequence.

[0231] Therefore, the gas producing member 430 can chemically react with heat generated when an arc is generated, thereby effectively providing gas for providing a transfer force to the arc.

[0232] exist Figures 10 and 11 In the illustrated embodiment, the gas generating component 430 includes a gas generating body 431 , a gas generating arm 432 , an arc flow channel accommodating space 433 , an arc flow channel accommodating groove 434 , and a gas fastening hole 435 .

[0233] The gas generating body 431 forms a component of the gas generating member 430 . At least a portion of the gas generating body 431 is accommodated in the accommodation space 446 of the arc flow channel 440 .

[0234] The gas generating body 431 is combined with the arc flow channel 440 and the cover 500. The combination is achieved by a fastening member 450 penetrating a gas fastening hole 435 formed inside the gas generating body 431.

[0235] The gas generating body 431 can be formed into a shape corresponding to the shape of the accommodation space 446. In the illustrated embodiment, the gas generating body 431 is formed into a polygonal plate shape having a width in the left-right direction, a height in the upper-lower direction, and a thickness in the front-back direction. In this case, the width of the gas generating body 431 (i.e., its length in the left-right direction) can be longer than the width of the second arc runner body 442 of the arc runner 440.

[0236] The gas generating body 431 is continuous with the gas generating arm 432 .

[0237] The gas generating arm 432 forms another component of the gas generating member 430. The gas generating arm 432 extends outward from the gas generating body 431. Specifically, the gas generating arm 432 extends downward from one end of the gas generating body 431 in the height direction, specifically, the lower end in the illustrated embodiment.

[0238] The gas generating arm 432 is coupled to the arc flow channel 440 and the cover 500 . The coupling is achieved by a fastening member 450 penetrating a gas fastening hole 435 formed inside the gas generating arm 432 .

[0239] A plurality of gas-producing arms 432 may be provided. The plurality of gas-producing arms 432 may be spaced apart from each other along the width direction of the gas-producing body 431. In the illustrated embodiment, two gas-producing arms 432 are provided, one connected to the lower left end and the other to the lower right end of the gas-producing body 431, respectively.

[0240] The gas generating arm 432 is supported by the fixed contact stage 410 . Specifically, an end portion of the gas generating arm 432 in the extending direction, specifically a lower end portion in the illustrated embodiment, is received in the gas generating member receiving groove 416 and can be supported by the second extension portion 412 .

[0241] At this time, the pair of gas generating arms 432 are disposed opposite to each other with the arc flow channel accommodating space 433 interposed therebetween.

[0242] The arc runner accommodation space 433 is a space in which the gas generating member 430 accommodates the arc runner 440. The arc runner accommodation space 433 may be defined as a space partially surrounded by the gas generating body 431 and the gas generating arm 432.

[0243] Specifically, in the illustrated embodiment, the upper side of the arc runner accommodating space 433 is surrounded by the lower side of the gas generating body 431. Furthermore, the left and right sides of the arc runner accommodating space 433 are surrounded by a pair of gas generating arms 432. The remaining portion of the arc runner accommodating space 433, in the illustrated embodiment, may be open at the lower side to allow the second arc runner body 442 of the arc runner 440 to be inserted.

[0244] The arc runner accommodation space 433 may be formed to correspond to the shape of the arc runner 440, specifically, the second arc runner body 442. In the illustrated embodiment, the arc runner accommodation space 433 is formed as a square plate-shaped space with its lower side open.

[0245] The arc runner accommodating groove 434 is defined as another space of the gas producing member 430 for accommodating the arc runner 440. The arc runner accommodating groove 434 accommodates a portion of the third arc runner body 443 of the arc runner 440 combined with the gas producing member 430.

[0246] The arc flow channel accommodating groove 434 is formed inside the gas generating body 431. Specifically, the arc flow channel accommodating groove 434 is formed in a concave shape on a surface of the gas generating body 431 facing the interior space of the frame 100, and in the embodiment shown, on the front side.

[0247] The arc runner accommodating groove 434 can be formed to correspond to the shape of the third arc runner body 443. In the illustrated embodiment, the arc runner accommodating groove 434 is open on its lower side, but surrounded by the gas generating body 431 on its upper side. Furthermore, the widthwise extension of the upper side of the arc runner accommodating groove 434 is shorter than the widthwise extension of the lower side. Therefore, it can be understood that the arc runner accommodating groove 434 includes a portion whose cross-sectional area decreases from the lower side toward the upper side.

[0248] The third arc runner body 443 inserted into the arc runner accommodating groove 434 can be supported by the gas generating body 431 surrounding the arc runner accommodating groove 434. Thus, the gas generating member 430 and the arc runner 440 can be stably connected.

[0249] The gas fastening hole 435 is a space in which the fastening member 450 is coupled. The gas fastening hole 435 is formed through the gas producing member 430 .

[0250] The gas fastening hole 435 overlaps with the arc fastening hole 447 formed in the arc flow channel 440 and the cover fastening hole 540 of the cover 500. That is, the fastening member 450 can penetrate the gas fastening hole 435 and the arc fastening hole 447 and be connected to the cover fastening hole 540.

[0251] The gas fastening hole 435 may have any shape through which the fastening member 450 can pass. In the illustrated embodiment, the gas fastening hole 435 is formed as a disk-shaped space having a circular cross section and a thickness in the front-rear direction.

[0252] A plurality of gas fastening holes 435 may be formed. The plurality of gas fastening holes 435 may be formed in the gas-generating body 431 or the gas-generating arms 432. In the illustrated embodiment, three gas fastening holes 435 are formed. In this case, any one of the gas fastening holes 435 is located upwardly, biased toward the gas-generating body 431. The remaining gas fastening holes 435 are formed in the pair of gas-generating arms 432.

[0253] The number and arrangement of the gas fastening holes 435 may be changed according to the number and arrangement of the arc fastening holes 447 and the cover fastening holes 540 .

[0254] Alternatively, the circuit breaker 10 may be configured without the gas generating member 430. In this embodiment, the frame 100 or the cover 500 may be formed of a material capable of generating gas, that is, the same material as the gas generating member 430. Specifically, the frame 100 or the cover 500 may be configured to generate gas by chemically reacting with the heat generated during arcing.

[0255] In the embodiment, it can be understood that the gas generated in the frame 100 or the cover 500 can cool the generated arc and allow the arc to flow toward the arc extinguishing member 200 .

[0256] The arc flow path 440 guides the generated arc toward the arc extinguishing member 200 . The arc generated when the fixed contact 420 and the movable contact 322 are separated can be quickly guided to the arc extinguishing member 200 through the arc flow path 440 .

[0257] The arc flow path 440 extends between the arc extinguishing member 200 and the fixed contact 420. Figure 3 The upper end of the arc flow channel 440 is located adjacent to the arc extinguishing member 200 , and the lower end of the arc flow channel 440 is located adjacent to the fixed contact 420 .

[0258] Therefore, the arc generated at the fixed contact 420 may extend along the arc flow path 440 and be guided to the arc extinguishing member 200 .

[0259] The arc runner 440 is coupled to the fixed contact base 410 . A portion of the arc runner 440 can be accommodated in the arc runner accommodation groove 417 and supported by the fixed contact base 410 . The remaining portion of the arc runner 440 can be positioned and supported by the arc runner support portion 413 .

[0260] The arc runner 440 is combined with the gas generating member 430. At this time, the arc runner 440 surrounds at least a portion of the gas generating member 430 and is combined with the gas generating member 430. As described above, the arc runner 440 can accommodate a portion of the gas generating member 430.

[0261] The arc flow channel 440 is coupled to the cover body 500 . The arc flow channel 440 may be arranged to overlap with the gas producing member 430 , and may be coupled to the cover body 500 via a fastening member 450 .

[0262] exist Figures 12 to 13 In the illustrated embodiment, the arc flow channel 440 includes a first arc flow channel body 441 , a second arc flow channel body 442 , a third arc flow channel body 443 , an arc flow channel arm 444 , a slot 445 , an accommodation space 446 , an arc fastening hole 447 , and a contact platform accommodation space 448 .

[0263] The first arc runner body 441 forms a portion of the outer shape of the arc runner 440. The first arc runner body 441 is defined as a structure formed by combining the arc runner 440 and the cover 500.

[0264] The first arc runner body 441 is arranged to overlap with the gas generating member 430. Specifically, the first arc runner body 441 is arranged to overlap with the gas generating body 431 accommodated in the accommodation space 446.

[0265] The first arc runner body 441 is located facing the third arc runner body 443. In the illustrated embodiment, the first arc runner body 441 faces the third arc runner body 443 across the accommodation space 446.

[0266] The first arc runner body 441 may have a shape corresponding to the shape of the contact platform coupling portion 530 of the cover 500. In the illustrated embodiment, the first arc runner body 441 is formed in a square plate shape having a width in the left-right direction, a height in the up-down direction, and a thickness in the front-back direction.

[0267] One end portion in the height direction of the first arc runner body 441 , in the illustrated embodiment, a lower end portion, is continuous with the second arc runner body 442 .

[0268] The second arc runner body 442 forms another portion of the outer shape of the arc runner 440. The second arc runner body 442 is the portion of the arc runner 440 that is mounted on the arc runner support portion 413.

[0269] The second arc runner body 442 is continuous with the first arc runner body 441 and the third arc runner body 443. In this case, the second arc runner body 442 may be continuous with the first arc runner body 441 and the third arc runner body 443 at a predetermined angle.

[0270] In the illustrated embodiment, the second arc runner body 442 is continuous with the first arc runner body 441 at a predetermined angle relative to the first arc runner body 441. In one embodiment, the predetermined angle may be an acute angle, a right angle, or an obtuse angle. Furthermore, the second arc runner body 442 is continuous with the third arc runner body 443 at a right angle or an acute angle relative to the third arc runner body 443.

[0271] The second arc runner body 442 may have any shape that can connect the first arc runner body 441 and the third arc runner body 443 and be supported by the arc runner support portion 413. In the illustrated embodiment, the second arc runner body 442 extends in the front-to-back direction so as to protrude toward one side of the fixed contact base 410, that is, toward the bottom.

[0272] The third arc runner body 443 forms another portion of the outer shape of the arc runner 440. The third arc runner body 443 is a component that combines the arc runner 440 and the gas generating member 430.

[0273] Specifically, the third arc runner body 443 is accommodated in the arc runner accommodating groove 434 of the gas generating member 430. The third arc runner body 443 can pressurize one side of the gas generating body 431 where the arc runner accommodating groove 434 is formed, that is, the front side.

[0274] Therefore, the coupled state of the gas producing member 430 and the arc runner 440 can be stably maintained.

[0275] The third arc runner body 443 is continuous with the second arc runner body 442. As described above, the third arc runner body 443 may form a right angle or an acute angle with respect to the second arc runner body 442 and extend.

[0276] The third arc runner body 443 extends in the same direction as the first arc runner body 441, in the vertical direction in the embodiment shown. The third arc runner body 443 may extend in a direction toward the first arc runner body 441, in the embodiment shown, in an inclined manner toward the rear.

[0277] Therefore, it can be understood that the distance between the third arc runner body 443 and the first arc runner body 441 decreases in a direction from the lower side toward the upper side of the third arc runner body 443 .

[0278] One end portion of the third arc runner body 443 in the extending direction, in the illustrated embodiment, the upper end portion, may extend parallel to the surface of the gas generating body 431. Thus, the one end portion of the third arc runner body 443 may contact the surface of the gas generating body 431 surrounding the arc runner accommodating groove 434 and support the gas generating member 430.

[0279] The arc runner arm 444 forms another portion of the outer shape of the arc runner 440. The arc runner arm 444 is a component that combines the arc runner 440, the gas generating member 430, and the cover body 500.

[0280] The arc runner arm 444 is continuous with the first arc runner body 441. The arc runner arm 444 extends along the height direction of the first arc runner body 441, and in the illustrated embodiment, extends in the up-down direction.

[0281] A plurality of arc runner arms 444 may be provided. The plurality of arc runner arms 444 may be spaced apart from one another along the width of the first arc runner body 441. In the illustrated embodiment, a pair of arc runner arms 444 are provided, located at the left and right ends of the lower side of the first arc runner body 441, respectively. The space formed between the pair of arc runner arms 444 is defined as a contact stage accommodation space 448.

[0282] The arc runner arm 444 is supported by the fixed contact base 410 . Specifically, an end portion of the arc runner arm 444 in the extending direction, specifically a lower end portion in the illustrated embodiment, can be received in the arc runner receiving groove 417 and supported by the second extension portion 412 .

[0283] Thus, the connection state between the arc flow channel 440 and the fixed contact base 410 can be stably maintained.

[0284] The cutout 445 forms a passage for the gas generated in the gas generating member 430 to flow into the interior of the frame 100. The cutout 445 is formed through the arc flow channel 440 to connect the accommodation space 446 and the interior of the frame 100.

[0285] As will be described later, the accommodation space 446 also communicates with the interior space of the frame 100 in the width direction of the arc flow channel 440, or in the left-right direction in the illustrated embodiment. Therefore, it can be said that the slots 445 form an additional path for the gas generated in the gas generating member 430 to flow more quickly toward the arc.

[0286] The slots 445 are formed in the arc runner 440 in a direction toward the interior space of the frame 100. In the illustrated embodiment, the slots 445 are formed in the second arc runner body 442 and the third arc runner body 443. In other words, the slots 445 are not formed in the first arc runner body 441 in a direction toward the housing 500.

[0287] Therefore, the gas generated in the gas producing member 430 may be concentratedly flowed toward the inner space of the frame 100 , that is, toward the direction in which the arc is generated, rather than flowing toward the cover body 500 .

[0288] The slot 445 may extend along the extension direction of the second arc runner body 442 and the third arc runner body 443. In the illustrated embodiment, the slot 445 extends from the rear end of the second arc runner body 442 to a position adjacent to the upper end of the third arc runner body 443.

[0289] The arc flow channel 440 contains the gas generating body 431 in the accommodation space 446. At least a portion of the accommodation space 446 may be open and communicate with the interior of the frame 100. Gas generated in the gas generating body 431 accommodated in the accommodation space 446 may flow into the interior of the frame 100.

[0290] The accommodation space 446 is defined as being partially surrounded by the first arc runner body 441, the second arc runner body 442, and the third arc runner body 443. In the illustrated embodiment, the rear side of the accommodation space 446 is surrounded by the first arc runner body 441, and the bottom side of the accommodation space 446 is surrounded by the second arc runner body 442. Furthermore, the front side of the accommodation space 446 is surrounded by the third arc runner body 443.

[0291] Therefore, the gas generating body 431 accommodated in the accommodation space 446 may be supported at the front side by the third arc runner body 443 , at the bottom side by the second arc runner body 442 , and at the rear side by the first arc runner body 441 .

[0292] The accommodating space 446 is open on both sides in the width direction, with the left and right sides being open in the illustrated embodiment. Furthermore, the second arc runner body 442 and the third arc runner body 443, which surround the accommodating space 446 on the front and bottom sides, are formed with slots 445 that connect the accommodating space 446 to the interior space of the frame 100.

[0293] Therefore, the accommodation space 446 can communicate with the interior space of the frame 100 in multiple directions except the direction toward the cover body 500 (i.e., the rear side). Therefore, the gas generated in the gas generating body 431 accommodated in the accommodation space 446 can smoothly flow toward the interior space of the frame 100.

[0294] The accommodation space 446 may have any shape that can accommodate the gas generating body 431. In the illustrated embodiment, the accommodation space 446 is a space in the shape of a three-dimensional figure whose cross-sectional area gradually decreases toward the upper side.

[0295] The arc fastening hole 447 is a space for the fastening member 450 to be coupled. The arc fastening hole 447 is formed through the arc flow channel 440 .

[0296] The arc fastening hole 447 is arranged to overlap with the gas fastening hole 435 and the cover fastening hole 540 . That is, the fastening member 450 may penetrate and be coupled to the gas fastening hole 435 , the arc fastening hole 447 , and the cover fastening hole 540 .

[0297] The arc fastening hole 447 may have any shape through which the fastening member 450 can pass. In the illustrated embodiment, the arc fastening hole 447 is formed as a disk-shaped space having a circular cross section and a thickness in the front-rear direction.

[0298] A plurality of arc fastening holes 447 may be formed. The plurality of arc fastening holes 447 may be formed in the arc runner bodies 441, 442, 443 or the arc runner arms 444. In the illustrated embodiment, three arc fastening holes 447 are formed. In this case, any one of the arc fastening holes 447 is located adjacent to the upper end of the third arc runner body 443. The remaining arc fastening holes 447 are formed in the pair of arc runner arms 444.

[0299] The number and arrangement of the arc fastening holes 447 may be changed according to the number and arrangement of the gas fastening holes 435 and the cover fastening holes 540 .

[0300] The contact base accommodating space 448 constitutes a portion where the fixed contact base 410 and the arc flow channel 440 are connected.

[0301] Of the sides of the contact stage accommodating space 448, the side facing the fixed contact stage 410 may be open at the bottom in the illustrated embodiment, thereby allowing the fixed contact stage 410 to enter the contact stage accommodating space 448. The second arc runner body 442 may be supported by the arc runner support portion 413 of the fixed contact stage 410 accommodated in the contact stage accommodating space 448.

[0302] The contact stage accommodating space 448 can be defined as a space surrounded by the first arc runner body 441, the second arc runner body 442, and the arc runner arm 444. In the illustrated embodiment, one side in the height direction of the contact stage accommodating space 448, that is, the upper side, is surrounded by the first arc runner body 441 or the second arc runner body 442.

[0303] Furthermore, each side of the width direction of the contact stage accommodating space 448, the left and right sides in the illustrated embodiment, is surrounded by a pair of arc runner arms 444. As described above, the lower side of the contact stage accommodating space 448 may be open to form a passage for accommodating the fixed contact stage 410.

[0304] The fixed contact base 410 accommodated in the contact base accommodation space 448 is surrounded by the first arc runner body 441, the second arc runner body 442, and the pair of arc runner arms 444. Therefore, the fixed contact base 410 and the arc runner 440 can be stably connected.

[0305] The fastening member 450 couples the gas producing member 430, the arc flow channel 440, and the cover body 500. The fastening member 450 penetrates the gas producing member 430 and the arc flow channel 440 and is coupled to the cover body 500.

[0306] Specifically, the fastening member 450 passes through the gas fastening hole 435 and the arc fastening hole 447 and is inserted into the cover fastening hole 540. To this end, as described above, the gas fastening hole 435, the arc fastening hole 447, and the cover fastening hole 540 are arranged to overlap with each other in the insertion direction of the fastening member 450, that is, in the front-to-back direction in the illustrated embodiment.

[0307] The fastening member 450 may have any shape that can couple the gas generating member 430, the arc runner 440, and the cover 500. In one embodiment, the fastening member 450 may be a screw member such as a bolt.

[0308] A plurality of fastening members 450 may be provided. The plurality of fastening members 450 may be respectively coupled to the plurality of gas fastening holes 435, the plurality of arc fastening holes 447, and the plurality of cover fastening holes 540. In the illustrated embodiment, three fastening members 450 are provided and respectively coupled to three gas fastening holes 435, three arc fastening holes 447, and three cover fastening holes 540.

[0309] The cover 500 is coupled to and supports the fixed contact unit 400. The cover 500 covers the space formed inside the frame 100 and is coupled to the frame 100. Thus, a portion of the fixed contact unit 400, namely, a portion of the fixed contact stage 410, the fixed contact 420, the gas generating member 430, the arc runner 440, and the fastening member 450, can be accommodated within the space formed inside the frame 100.

[0310] The cover 500 is coupled to the frame 100. The cover 500 is coupled to one side in the longitudinal direction of the frame 100, that is, the rear side in the illustrated embodiment.

[0311] In one embodiment, the cover 500 hermetically seals the interior of the frame 100 and is coupled to the frame 100. Therefore, an arc generated within the interior of the frame 100 can be extinguished by passing through the arc-extinguishing member 200 and then discharged to the outside. Furthermore, since the heat generated during the arcing prevents the gas from leaking freely to the outside, the pressure within the interior of the frame 100 can be increased.

[0312] The cover 500 is coupled to the connection terminal 310 of the power supply unit 300 . The connection terminal 310 may be supported by the cover 500 and exposed to the outside. The connection terminal 310 may penetrate and couple to the cover 500 .

[0313] The cover 500 is coupled to the fixed contact portion 400. The fixed contact stage 410 may be supported by the cover 500 and exposed to the outside. The fixed contact stage 410 may penetrate and be coupled to the cover 500.

[0314] In addition, the cover 500 is coupled to the other components of the fixed contact portion 400 , that is, the gas generating member 430 and the arc flow channel 440 . As described above, the coupling can be achieved by the fastening member 450 .

[0315] exist Figures 14 to 17 In the illustrated embodiment, the cover 500 includes a contact cover body 510 , a terminal coupling portion 520 , a contact platform coupling portion 530 , and a cover fastening hole 540 .

[0316] The contact cover body 510 forms the outer shape of the cover 500. The contact cover body 510 covers a space formed inside the frame 100 and is coupled to the frame 100.

[0317] The contact cover body 510 is formed with a terminal coupling portion 520, a contact platform coupling portion 530, and a cover fastening hole 540. The contact cover body 510 can be coupled with the terminal 310 and the fixed contact portion 400 and support the terminal 310 and the fixed contact portion 400.

[0318] The contact cover body 510 can be coupled to the frame 100 and can have any shape capable of coupling with and supporting the conducting portion 300 and the fixed contact portion 400. In the illustrated embodiment, the contact cover body 510 has a polygonal column shape having a height in the vertical direction, a width in the left-right direction, and a thickness in the front-back direction.

[0319] In the illustrated embodiment, the contact cover body 510 includes an outer wall 511 and an inner wall 512 .

[0320] The outer wall 511 forms a portion of the outer circumference of the contact cover body 510. In the illustrated embodiment, the outer wall 511 is located on one side of the contact cover body 510 that faces the frame 100, ie, the front side.

[0321] A plurality of outer walls 511 may be provided. The plurality of outer walls 511 may form the outer periphery of the width direction of the one side of the contact cover body 510. In the illustrated embodiment, two outer walls 511 are formed, forming the outer peripheries of the left and right sides of the contact cover body 510, respectively. The outer walls 511 extend along the height direction of the contact cover body 510, and in the illustrated embodiment, extend in the vertical direction.

[0322] The pair of outer walls 511 are disposed opposite to each other with the terminal coupling portion 520 and the contact platform coupling portion 530 interposed therebetween.

[0323] The outer wall 511 partially surrounds the terminal bonding portion 520 and the contact platform bonding portion 530 along its width. In the illustrated embodiment, the outer wall 511 on the left side is on the outside, that is, the left side surrounds the first terminal bonding portion 520a and the first contact platform bonding portion 530a on the left side. Furthermore, the outer wall 511 on the right side is on the outside, that is, the right side surrounds the third terminal bonding portion 520c and the third contact platform bonding portion 530c on the right side.

[0324] The inner wall 512 is located between the pair of outer walls 511 .

[0325] The inner wall 512 divides the interior of the contact cover body 510, that is, the space between the pair of outer walls 511, into a plurality of spaces. The plurality of spaces divided by the inner wall 512 can be respectively composed of a plurality of terminal coupling portions 520 and a plurality of contact platform coupling portions 530.

[0326] The inner wall 512 extends in the same direction as the outer wall 511 , ie, vertically in the embodiment shown. The inner wall 512 is arranged in the width direction of the contact cover body 510 and is separated from the outer wall 511 in the horizontal direction in the embodiment shown.

[0327] A plurality of inner walls 512 may be provided. The plurality of inner walls 512 may be spaced apart from each other in the width direction of the contact cover body 510. Thus, a plurality of spaces may be defined between the plurality of outer walls 511 and the plurality of inner walls 512.

[0328] In the illustrated embodiment, two inner walls 512 are provided and are spaced apart from each other in the left-right direction, thereby dividing the space between the pair of outer walls 511 into three small spaces.

[0329] The terminal coupling portion 520 is coupled to the terminal 310 of the power supply portion 300 . The terminal 310 can be coupled to the terminal coupling portion 520 and supported by the cover 500 .

[0330] The terminal engaging portion 520 is formed on the contact cover body 510. In this case, the terminal engaging portion 520 can be located on a side that is deviated in the height direction of the contact cover body 510. In the illustrated embodiment, the terminal engaging portion 520 is located on the lower side of the contact cover body 510. The position of the terminal engaging portion 520 can be changed according to the position of the terminal 310.

[0331] The terminal joints 520 may be formed in a plurality. The plurality of terminal joints 520 may be configured to include a portion of a space defined by a plurality of outer walls 511 and a plurality of inner walls 512. In the illustrated embodiment, the terminal joints 520 include a first terminal joint 520a, a second terminal joint 520b, and a third terminal joint 520c.

[0332] The first terminal coupling portion 520a is located between the outer wall 511 and the inner wall 512. The first terminal coupling portion 520a is coupled to the terminal 310 provided on the first conducting portion 300a.

[0333] The second terminal engaging portion 520b is located between a pair of opposing inner walls 512. The second terminal engaging portion 520b is engaged with the terminal 310 provided on the second conducting portion 300b.

[0334] The third terminal coupling portion 520c is located between the outer wall 511 and the inner wall 512. The third terminal coupling portion 520c is coupled to the terminal 310 provided on the third conducting portion 300c.

[0335] In the illustrated embodiment, the terminal coupling portion 520 includes a terminal accommodating space 521 and a terminal through-hole 522 .

[0336] The terminal accommodating space 521 is a space for accommodating the terminal 310. The terminal accommodating space 521 accommodates a portion of one end portion of the terminal 310 in the extending direction, that is, the rear portion in the illustrated embodiment.

[0337] The connection terminal accommodating space 521 is communicated with the connection terminal through hole 522 .

[0338] The connection terminal through hole 522 forms a passage exposed to the outside. The connection terminal through hole 522 may be penetrated and coupled with the connection terminal 310 .

[0339] The terminal through-hole 522 is formed through the contact cover body 510. In the illustrated embodiment, the terminal through-hole 522 is formed along the extension direction of the terminal 310, that is, along the front-to-back direction.

[0340] The terminal through-hole 522 may be formed to correspond to the cross-sectional shape of the terminal 310. In the illustrated embodiment, the terminal through-hole 522 is formed to have a rectangular cross-section with a width in the left-right direction being longer than a height in the up-down direction.

[0341] The contact platform coupling portion 530 is coupled to the fixed contact portion 400. The fixed contact portion 400 can be coupled to the cover 500 and supported by the contact platform coupling portion 530.

[0342] As described above, the circuit breaker 10 according to the embodiment of the present invention can easily realize the connection between the components of the fixed contact unit 400 and the cover 500. In addition, the connection between the fixed contact unit 400 and the cover 500 can be stably maintained. Detailed description of this will be given later.

[0343] The contact platform coupling portion 530 is formed on the contact cover body 510. In this case, the contact platform coupling portion 530 can be located on the other side of the contact cover body 510 in the height direction. In the illustrated embodiment, the contact platform coupling portion 530 is located on the upper side of the contact cover body 510. The position of the contact platform coupling portion 530 can be changed according to the position of the fixed contact portion 400.

[0344] That is, it can be understood that the contact platform coupling portion 530 is disposed spaced apart from the connection terminal coupling portion 520 so as to face the connection terminal coupling portion 520 .

[0345] The contact platform joint portion 530 may be formed in a plurality. The plurality of contact platform joint portions 530 may be configured to include another portion of the space defined by the plurality of outer walls 511 and the plurality of inner walls 512. In the illustrated embodiment, the contact platform joint portion 530 includes three contact platform joint portions: a first contact platform joint portion 530a, a second contact platform joint portion 530b, and a third contact platform joint portion 530c.

[0346] The first contact platform coupling portion 530a is located between the outer wall 511 and the inner wall 512, which are located on the left side. The first contact platform coupling portion 530a is coupled to the first fixed contact portion 400a.

[0347] The second contact platform coupling portion 530b is located between a pair of opposing inner walls 512. The second contact platform coupling portion 530b is coupled to the second fixed contact portion 400b.

[0348] The third contact platform coupling portion 530c is located between the outer wall 511 and the inner wall 512, which are located on the right side. The third contact platform coupling portion 530c is coupled to the third fixed contact portion 400c.

[0349] In the illustrated embodiment, the contact platform coupling portion 530 includes a contact platform accommodating space 531 and a contact platform through-hole 532 .

[0350] The contact stage accommodating space 531 accommodates the fixed contact stage 410. As described above, the fixed contact stage 410 includes the first extension portion 411 extending in one direction (i.e., front-to-back direction) and the second extension portion 412 extending in another direction (i.e., up-down direction) continuous with the first extension portion 411.

[0351] The contact platform receiving space 531 can receive a portion of the first extension 411 and the second extension 412. In the illustrated embodiment, the contact platform receiving space 531 receives a portion of the first extension 411 located adjacent to the second extension 412 and the second extension 412.

[0352] At this time, the second extension 412 can contact the surface of the contact cover body 510 surrounding the contact stage accommodating space 531 on the rear side, that is, the front side in the illustrated embodiment. As a result, the fixed contact stage 410 can be supported by the contact cover body 510, thereby preventing any shaking or separation.

[0353] The contact platform accommodating space 531 communicates with the contact platform through-hole 532 .

[0354] The contact platform through hole 532 forms a passage for exposing the first extension portion 411 of the fixed contact platform 410 to the outside. The first extension portion 411 may penetrate and be coupled to the contact platform through hole 532.

[0355] The contact platform through hole 532 is formed through the contact cover body 510. In the illustrated embodiment, the contact platform through hole 532 is formed along the extending direction of the first extension portion 411, that is, along the front-to-back direction.

[0356] The contact platform through hole 532 may be formed to correspond to the cross-sectional shape of the first extension portion 411. In the illustrated embodiment, the contact platform through hole 532 is formed to have a rectangular cross-section with a width in the left-right direction formed longer than a height in the up-down direction.

[0357] The cover fastening hole 540 is a space in which the fastening member 450 is coupled. The cover fastening hole 540 is formed through the contact cover body 510. Alternatively, the cover fastening hole 540 may be formed as a recessed portion of the contact cover body 510 facing the frame 100, in the illustrated embodiment, on the front side.

[0358] The cover fastening hole 540 overlaps with the gas fastening hole 435 and the arc fastening hole 447. That is, the fastening member 450 can be respectively coupled to the gas fastening hole 435, the arc fastening hole 447, and the cover fastening hole 540. In one embodiment, the fastening member 450 can penetrate the gas fastening hole 435 and the arc fastening hole 447 and be inserted into or coupled to the cover fastening hole 540.

[0359] The cover fastening hole 540 may have any shape that can be coupled with the fastening member 450. In the illustrated embodiment, the cover fastening hole 540 is formed as a disc-shaped space having a circular cross section and a thickness in the front-rear direction.

[0360] A plurality of cover fastening holes 540 may be formed. The plurality of cover fastening holes 540 may be spaced apart and may be formed through or recessed in one side of the contact cover body 510. In the illustrated embodiment, three cover fastening holes 540 are formed, located on the upper side, left side, and right side of the contact platform coupling portion 530, respectively.

[0361] The number and arrangement of the cover fastening holes 540 may be changed according to the number and arrangement of the gas fastening holes 435 and the arc fastening holes 447 .

[0362] 4. Description of the Assembly Process and Status of the Circuit Breaker 10 of the Embodiment of the Present Invention

[0363] Reference Figures 18 to 20 , showing an example of a state in which the fixed contact portion 400 and the cover 500 provided in the circuit breaker 10 according to the embodiment of the present invention are assembled.

[0364] The circuit breaker 10 according to the embodiment of the present invention can easily achieve the combination of the fixed contact portion 400 and the cover 500. In addition, the circuit breaker 10 according to the embodiment of the present invention can stably maintain the combined state of the fixed contact portion 400 and the cover 500.

[0365] First, a description is given of a process of combining the fixed contact portion 400 and the cover 500 provided on the circuit breaker 10 according to an embodiment of the present invention.

[0366] First, the fixed contact stage 410 can be combined with the cover 500, and then the gas generating member 430 and the arc flow channel 440 can be combined with the cover 500. Alternatively, the gas generating member 430 and the arc flow channel 440 can be combined with the cover 500 first, and then the fixed contact stage 410 can be combined with the cover 500.

[0367] The fixed contact platform 410 is coupled to the cover 500 . The first extension portion 411 of the fixed contact platform 410 penetrates and couples with the contact platform through hole 532 , and the second extension portion 412 is received in the contact platform receiving space 531 .

[0368] Then, the gas generating component 430 and the arc runner 440 are combined with the cover 500. In one embodiment, the gas generating component 430 may be first disposed on the cover 500, and then the arc runner 440 may be combined with the gas generating component 430 and disposed on the cover 500.

[0369] As an alternative, the gas generating component 430 and the arc flow channel 440 may be combined first, and then the gas generating component 430 and the arc flow channel 440 may be disposed on the cover 500 .

[0370] At this time, the gas fastening holes 435 , the arc fastening holes 447 , and the cover fastening holes 540 may be arranged to overlap with each other in the coupling direction of the fixed contact base 410 , ie, the front-to-back direction in the illustrated embodiment.

[0371] The fastening members 450 are respectively coupled to the gas fastening holes 435, the arc fastening holes 447, and the cover fastening holes 540. In this case, the gas fastening holes 435, the arc fastening holes 447, and the cover fastening holes 540 can be provided in plural numbers, so that the gas generating member 430, the arc flow channel 440, and the cover 500 can be stably coupled by the plurality of fastening members 450.

[0372] At the same time, the gas producing member 430 and the arc flow channel 440 combined with the cover body 500 can support the fixed contact stage 410 in the upper side in the illustrated embodiment in the height direction. Therefore, the fixed contact stage 410 can also be stably combined with the cover body 500.

[0373] Therefore, in the embodiment of the present invention, the fixed contact base 410 can be coupled to the cover 500 with a portion thereof exposed to the outside of the circuit breaker 10 simply by inserting the fixed contact base 410 into the contact base through-hole 532 .

[0374] Furthermore, the other components of the fixed contact unit 400 and the fixed contact base 410 are coupled to the cover 500 so as to support each other. This ensures that the coupled state between the components of the fixed contact unit 400 and the coupled state between the fixed contact unit 400 and the cover 500 can be stably maintained.

[0375] Below, refer to Figures 18 to 20 , illustrating the connection relationship between the fixed contact portion 400 and the cover body 500.

[0376] First, first extension 411 of fixed contact stage 410 passes through contact stage through-hole 532, so that one side in its extension direction (the rear side in the illustrated embodiment) is exposed outside cover 500. Second extension 412 is accommodated in contact stage accommodating space 531 and is supported by contact with one side of contact cover body 510 surrounding contact stage accommodating space 531 (the front side in the illustrated embodiment).

[0377] At this time, it can be understood that the fixed contact 420 is in a state of being coupled to the front side surface of the second extending portion 412 .

[0378] In addition, the cover receiving groove 415 formed on the upper edge of the first extension portion 411 receives a portion of the contact cover body 510 (see FIG. Figure 20 The portion of the contact cover body 510 supports the first extension portion 411 at the upper side.

[0379] In addition, a gas-generating member receiving groove 416 formed at the upper edge of the second extension portion 412 receives the lower end of the gas-generating arm 432. The gas-generating arm 432 supports the second extension portion 412 at the upper side.

[0380] Furthermore, the arc flow channel receiving groove 417 formed at the upper edge of the second extension portion 412 receives the lower end of the arc flow channel arm 444. The arc flow channel arm 444 also supports the second extension portion 412 at the upper side.

[0381] Thus, the fixed contact base 410 can be stably combined with the gas generating member 430 , the arc flow channel 440 , and the cover 500 .

[0382] The gas generating member 430 is accommodated in the accommodation space 446 of the arc runner 440 . Thus, the gas generating member 430 is surrounded by the first arc runner body 441 and the third arc runner body 443 on both sides in the thickness direction, ie, the front side and the rear side.

[0383] In one embodiment, the front side and rear side of the gas generating member 430 may be in contact with and pressurized by the first arc runner body 441 and the third arc runner body 443, respectively, so that the gas generating member 430 does not separate toward the front or rear side.

[0384] The lower end of the gas generating body 431 is supported by the second arc runner body 442. Due to the gas generating arms 432 extending from the lower side of the gas generating body 431, the gas generating member 430 is prevented from escaping from the accommodation space 446 in the width direction, or in the illustrated embodiment, in the left-right direction. Furthermore, due to the fastening member 450 engaged with the gas fastening hole 435 located on the upper side, the gas generating member 430 is also prevented from escaping upward.

[0385] Thus, the gas producing member 430 and the arc runner 440 can be stably coupled.

[0386] The gas generating arm 432 is accommodated in the gas generating member accommodating groove 416 formed in the fixed contact stage 410. The gas generating arm 432 is supported by the second extension portion 412. At the same time, the gas generating arm 432 supports the second extension portion 412 at the upper side.

[0387] Thus, the coupled state between the gas generating member 430 and the fixed contact base 410 can be stably maintained.

[0388] In addition, a fastening member 450 is coupled to the gas fastening hole 435 formed in the gas generating arm 432. The gas generating member 430 and the cover body 500 can be stably coupled.

[0389] The arc runner 440 is coupled to the housing 500 while accommodating the gas generating member 430. The gas generating arm 432 covers the arc runner arm 444 and is coupled to the housing 500. In other words, the gas generating arm 432 faces the housing 500 with the arc runner arm 444 interposed therebetween.

[0390] Therefore, the front side of the arc flow channel 440 is supported by the gas generating arm 432, and the rear side of the arc flow channel 440 is supported by the contact cover body 510. Therefore, the arc flow channel 440 does not come off toward the front side or the rear side.

[0391] The second arc runner body 442 is mounted on the arc runner support portion 413 of the fixed contact base 410. The second arc runner body 442 is supported by the arc runner support portion 413. At the same time, the second arc runner body 442 supports the second extension portion 412 at the upper side.

[0392] The arc runner arm 444 is received in the arc runner receiving groove 417. The arc runner arm 444 is supported by the second extension portion 412. Meanwhile, the arc runner arm 444 supports the second extension portion 412 on the upper side or in the width direction, ie, on the left and right sides.

[0393] Thus, the connection state between the arc flow channel 440 and the fixed contact base 410 can be stably maintained.

[0394] Furthermore, the arc fastening holes 447 formed in the third arc runner body 443 and the arc runner arm 444 are respectively connected to the fastening members 450. Thus, the connection state between the arc runner 440 and the cover 500 can be stably maintained.

[0395] That is, the various components of the fixed contact portion 400 can be simply coupled to the cover 500 via the fastening member 450. Furthermore, the various components of the fixed contact portion 400 can be coupled to each other in a mutually supportive manner, thereby stably maintaining the fixed contact portion 400 itself and the coupled state between the fixed contact portion 400 and the cover 500.

[0396] Although the embodiments of the present invention have been described, the technical ideas of the present invention are not limited to the embodiments described in this specification. Those skilled in the art who understand the technical ideas of the present invention can easily propose other implementation plans within the scope of the same idea by adding, modifying, deleting or supplementing constituent elements, and these modified plans should also be regarded as belonging to the scope of protection of the present invention.

[0397] 10: Circuit Breaker 100: Framework

[0398] 200: Arc extinguishing member 200a: First arc extinguishing member

[0399] 200b: Second arc-extinguishing member 200c: Third arc-extinguishing member

[0400] 300: current carrying portion 300a: first current carrying portion

[0401] 300b: Second conducting portion 300c: Third conducting portion

[0402] 310: Terminal block 320: Movable contact

[0403] 321: Movable contact base 322: Movable contact

[0404] 400: Fixed contact portion 400a: First fixed contact portion

[0405] 400b: Second fixed contact portion 400c: Third fixed contact portion

[0406] 410: Fixed contact base 411: First extension

[0407] 412: Second extension portion 413: Arc flow channel support portion

[0408] 414: Restriction protrusion 415: Cover body receiving groove

[0409] 416: Gas generating component receiving groove 417: Arc flow channel receiving groove

[0410] 420: Fixed contact 430: Gas generating component

[0411] 431: Gas production body 432: Gas production arm

[0412] 433: Arc flow channel accommodation space 434: Arc flow channel accommodation groove

[0413] 435: Gas fastening hole 440: Arc flow channel

[0414] 441: First arc flow channel body 442: Second arc flow channel body

[0415] 443: Third arc flow channel body 444: Arc flow channel arm

[0416] 445: cutting groove 446: accommodation space

[0417] 447: Arc fastening hole 448: Contact platform accommodation space

[0418] 450: Fastening member 500: Cover

[0419] 510: Contact cover body 511: Outer wall

[0420] 512: Inner wall 520: Terminal junction

[0421] 520a: first terminal joint portion 520b: second terminal joint portion

[0422] 520c: Third terminal joint 521: Terminal accommodation space

[0423] 522: Terminal through hole 530: Contact platform joint

[0424] 530a: First contact platform joint portion 530b: Second contact platform joint portion

[0425] 530c: third contact platform joint portion 531: contact platform accommodation space

[0426] 532: Contact platform through hole 540: Cover fastening hole

[0427] 1000: Circuit breaker of prior art 1100: Terminal block

[0428] 1110: Internal terminal 1111: Flow channel receiving groove

[0429] 1120: External terminal 1200: Arc flow channel

[0430] 1210: Terminal block connection end

Claims

1. A fixed contact portion, wherein: include: A fixed contact station electrically connected to an external power source or load; a fixed contact, coupled to the fixed contact platform and in contact with the movable contact; as well as an arc flow channel located on one side in the height direction of the fixed contact platform and configured to guide the generated arc; The fixed contact station comprises: a first extending portion extending in a direction; and a second extending portion, continuous with the first extending portion at a predetermined angle; The arc flow channel is disposed on and supported by the second extension portion.

2. The fixed contact portion according to claim 1, wherein The fixed contact base further includes an arc flow channel supporting portion protruding from an end portion of the second extending portion toward one end portion of the arc flow channel to support the arc flow channel.

3. The fixed contact portion according to claim 1, wherein including a gas generating member configured to chemically react with heat to generate gas; The gas producing member is accommodated in the arc flow channel and supported by the arc flow channel.

4. The fixed contact portion according to claim 3, wherein Gas-producing components include: a gas generating body, housed in the arc flow channel; and a gas generating arm extending from an end portion of the gas generating body toward one end portion of the fixed contact platform and surrounding the second extending portion; The fixed contact stage further includes a gas generating member accommodating groove formed concavely in an end portion of the second extending portion toward one end portion of the gas generating member to accommodate at least a portion of the gas generating arm.

5. The fixed contact portion according to claim 4, wherein The gas producing member accommodating groove is recessed and formed at an edge of the one end portion of the second extending portion.

6. The fixed contact portion according to claim 1, wherein A gas generating member is provided, which is configured to generate gas by chemically reacting with heat and is accommodated in the arc flow channel and supported by the arc flow channel; The arc flow channel comprises: an arc flow channel body, arranged to overlap with the gas generating component; as well as an arc runner arm extending from an end portion of the arc runner body toward one end portion of the fixed contact base and surrounding the second extension portion; The fixed contact stage further includes an arc runner accommodating groove recessedly formed in an end portion of the second extension portion toward one end portion of the arc runner to accommodate at least a portion of the arc runner arm.

7. The fixed contact portion according to claim 6, wherein: The arc flow channel accommodating groove is recessed and formed at an edge of the one end portion of the second extending portion.

8. The fixed contact portion according to claim 6, wherein Gas-producing components include: a gas generating body, housed in the arc flow channel; and a gas generating arm extending from an end portion of the gas generating body toward one end portion of the fixed contact platform and surrounding the second extending portion; The fixed contact stage further includes a gas generating component accommodating groove, which is recessed at the one end portion of the second extension portion to accommodate at least a portion of the gas generating arm and communicates with the arc flow channel accommodating groove.

9. The fixed contact portion according to claim 1, wherein The arc flow channel comprises: a first arc flow channel body extending along a height direction of the fixed contact platform; a second arc runner body extending in the one direction at a predetermined angle to the first arc runner body; a third arc runner body extending in a height direction of the fixed contact base at a predetermined angle to the second arc runner body so as to face the first arc runner body; and An accommodating space is formed to be surrounded by the first arc runner body, the second arc runner body, and the third arc runner body.

10. The fixed contact portion according to claim 9, wherein The third arc runner body extends obliquely toward the first arc runner body.

11. The fixed contact portion according to claim 9, wherein A gas generating member is provided, which is configured to generate gas by chemically reacting with heat and is accommodated in the arc flow channel and supported by the arc flow channel; The gas-generating component comprises: a gas generating body formed to have a width longer than that of the second arc flow channel body and accommodated in the accommodation space; as well as The gas generating arm extends from an end portion of the gas generating body toward one end portion of the fixed contact base and surrounds the second arc flow channel body in a width direction.

12. The fixed contact portion according to claim 11, wherein The gas producing component further includes an arc flow channel accommodating groove, which is recessed and formed on a surface of the gas producing body facing the third arc flow channel body to accommodate the third arc flow channel body.

13. A circuit breaker, wherein: include: A frame with a space formed inside; a cover body, covering the space and combined with the frame; as well as a fixed contact portion, housed in the space, combined with the cover and partially exposed to the outside, and electrically connected to an external power source or load; The fixed contact portion includes: a fixed contact platform, penetrating the cover and partially exposed to the outside; and an arc flow channel located on an upper side of the fixed contact stage and configured to guide the generated arc to the outside; The cover body comprises: a contact platform accommodating space, which is recessed and formed on a side of the cover body facing the frame and accommodates a portion of the fixed contact platform and the arc flow channel; and The contact platform through hole is formed through the interior of the contact platform accommodating space and is combined with the fixed contact platform.

14. The circuit breaker according to claim 13, wherein: The fixed contact station comprises: a first extension portion extending in one direction and penetrating the contact platform through hole to expose a portion thereof to the outside; and a second extension portion, located in the contact platform accommodation space and extending in a direction opposite to the arc flow path at a predetermined angle to the first extension portion; The arc flow channel surrounds a portion of the second extension portion.

15. The circuit breaker according to claim 14, wherein: The arc flow channel comprises: a first arc flow channel body, contacting the one side of the cover body and extending in another direction; a second arc runner body extending in a direction toward the frame at a predetermined angle to the first arc runner body; a third arc runner body extending in the other direction at a predetermined angle to the second arc runner body, wherein an end portion of the third arc runner body in the extending direction is coupled to the one surface of the cover; and An accommodating space is formed to be surrounded by the first arc runner body, the second arc runner body, and the third arc runner body.

16. The circuit breaker according to claim 15, wherein: The gas generating member is located on the upper side of the fixed contact platform and is combined with the cover body, and is configured to generate gas by chemically reacting with heat generated when an arc is generated; The gas-generating component comprises: A gas-generating body, accommodated in the accommodation space; as well as A pair of gas generating arms extends from a lower end portion of the gas generating body and surrounds the second extending portion and the second arc flow channel body in a width direction.

17. The circuit breaker according to claim 14, wherein: The fixed contact station further includes an arc flow channel support portion protruding from an upper end portion of the second extension portion; The arc flow channel support portion is in contact with a portion of the cover body surrounding the contact platform through hole on the upper side; The second extension portion contacts another portion of the cover body surrounding the contact platform through hole on the lower side.

18. The circuit breaker according to claim 14, wherein: The fixed contact platform further includes a cover receiving groove, wherein the cover receiving groove is formed by being recessed inwardly at a pair of edges located on the upper side of the first extension portion to receive a portion of the cover; A portion of the cover body accommodated in the cover body accommodating groove is configured to support the first extension portion.

19. The circuit breaker according to claim 14, wherein: The gas generating member is located on the upper side of the fixed contact platform and is combined with the cover body, and is configured to generate gas by chemically reacting with heat generated when an arc is generated; The arc flow channel includes arc flow channel arms extending downward, the arc flow channel arms being spaced apart from each other in the width direction so as to surround the second extension portion in the width direction; The gas generating member includes gas generating arms extending downward. The gas generating arms are spaced apart from each other in the width direction to surround the second extension portion in the width direction and are arranged to overlap with the arc runner arm facing the cover body with the arc runner arm interposed therebetween.

20. The circuit breaker according to claim 19, wherein The fixed contact station comprises: an arc flow channel accommodating groove, recessed and formed at an upper edge of the second extension portion, for accommodating the arc flow channel arm; and The gas generating component accommodating groove is located closer to the space of the frame than the arc flow channel accommodating groove, and is recessed at the upper edge of the second extension portion to accommodate the gas generating arm and communicate with the arc flow channel accommodating groove.

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