Arc extinguishing structure and circuit breaker

Abstract

The utility model belongs to the technical field of low-voltage electric appliances, and discloses an arc extinguishing structure and a circuit breaker. The arc extinguishing structure comprises a base and an arc striking piece; wherein an arc extinguish chamber is arranged in the base; the arc striking piece is of an integrally-formed structure and is arranged in the base, the arc striking piece comprises an arc striking plate and a magnetism increasing plate, the arc striking plate is arranged in the arc extinguish chamber and is used for introducing an electric arc into the arc extinguish chamber, and the magnetism increasing plate is used for being connected with the static contact and can form a closed-loop magnetic conduction loop so as to guide the electric arc into the arc extinguish chamber. According to the arc extinguishing structure, the arc striking piece is arranged to be of the integrally-formed structure, the magnetism increasing plate in the arc striking piece replaces a magnetism increasing block in the prior art, the magnetism increasing block does not need to be independently arranged in the base, the number of parts is small, assembling is easy and convenient, and the cost of the arc extinguishing structure and the cost of the circuit breaker are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of low-voltage electrical appliances, in particular to an arc extinguishing structure and a circuit breaker. Background Art

[0002] As an important component of the molded case circuit breaker, the arc extinguishing structure includes an arc extinguishing chamber, an arc striking angle, a magnetizing block, etc. Among them, the magnetic blowing of the arc generated when the moving and static contacts are separated can be introduced into the arc extinguishing chamber through the magnetic blowing effect of the magnetizing block.

[0003] However, in the current arc extinguishing structure, since the arc striking angle and the magnetizing block are two separately provided parts, the assembly is cumbersome and troublesome, and the cost of providing the two parts is high, which increases the cost of the entire arc extinguishing structure and the molded case circuit breaker.

[0004] Therefore, there is an urgent need for an arc extinguishing structure and a circuit breaker to solve the above problems. Utility Model Content

[0005] The utility model aims to provide an arc extinguishing structure and a circuit breaker, in which an arc striking member is arranged as an integrally formed structure, so that a magnetizing plate in the arc striking member replaces the magnetizing block in the prior art, and there is no need to arrange a magnetizing block separately. The number of parts is small, the assembly is simple and convenient, and the cost of the arc extinguishing structure and the circuit breaker is reduced.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] Arc extinguishing structure, including:

[0008] A base, in which an arc extinguishing chamber is arranged;

[0009] The arc-striking component is an integrally formed structure and is arranged in the base. The arc-striking component includes an arc-striking plate and a magnetizing plate. The arc-striking plate is placed in the arc extinguishing chamber to introduce the arc into the arc extinguishing chamber. The magnetizing plate is used to connect with the static contact and can form a closed-loop magnetic conductive circuit to guide the arc into the arc extinguishing chamber.

[0010] As an optional solution, the arc-starting member is made of conductive and magnetic material.

[0011] As an optional solution, the magnetizing plate includes a base plate and a bending boss, the bending bosses are symmetrically arranged on two opposite sides of the base plate, the bending boss is bent toward each other at one end opposite to the base plate, and the static contact is accommodated between the base plate and the bending boss.

[0012] As an optional solution, one end of the arc-striking plate is connected to the bottom plate, and the other end of the arc-striking plate extends obliquely to below the arc-extinguishing grid in the arc-extinguishing chamber, and the arc-striking plate is arranged parallel to the arc-extinguishing grid.

[0013] A circuit breaker, comprising the arc extinguishing structure as described above, the circuit breaker further comprising:

[0014] A moving contact and a stationary contact, wherein the stationary contact is located below the arc extinguishing chamber, a first end of the moving contact is rotatably disposed in the base, and a second end of the moving contact can be attracted or disconnected with the stationary contact;

[0015] A blocking member is slidably disposed in the base along the Z axis and is located below the moving contact. The blocking member abuts against the moving contact along the Z axis to prevent the arc in the arc extinguishing chamber from spraying toward the first end of the moving contact.

[0016] As an optional solution, the base is provided with a first limiting groove and a second limiting groove which are interconnected; the blocking member comprises:

[0017] A baffle plate is slidably connected to the first limiting groove along the Z axis, and connecting protrusions are respectively provided on opposite sides of the baffle plate, and the connecting protrusions are located in the second limiting groove;

[0018] An elastic member is arranged in the second limiting groove, and two ends of the elastic member are respectively abutted against the groove bottom of the second limiting groove and the connecting protrusion, and the elastic member makes the baffle abut against the moving contact.

[0019] As an optional solution, the connecting protrusion is a cylindrical structure, and the shape of the second limiting groove matches the shape of the connecting protrusion.

[0020] As an optional solution, a cylindrical protrusion is provided at one end of the baffle that contacts the moving contact, and the cylindrical protrusion abuts against the lower surface of the moving contact.

[0021] As an optional solution, the elastic member is a compression spring.

[0022] As an optional solution, the blocking member and the arc extinguishing chamber are respectively provided in plurality, and the blocking member and the arc extinguishing chamber are provided in one-to-one correspondence.

[0023] Beneficial effects:

[0024] The arc extinguishing structure proposed by the utility model realizes the arc striking function by setting the arc striking member as an integrally formed structure, so that the arc striking member includes an arc striking plate and a magnetizing plate, and the arc striking plate is placed in the arc extinguishing chamber for introducing the arc into the arc extinguishing chamber; at the same time, the magnetizing plate is connected to the static contact and can form a closed-loop magnetic conductive circuit to increase the magnetic field strength of the arc flowing through the magnetizing plate, so as to guide the arc generated when the moving contact and the static contact are disconnected to enter the arc extinguishing chamber, thereby realizing the magnetic blowing function of the magnetizing block; an arc striking member with arc striking function and magnetic blowing function and formed in one piece is adopted, that is, the arc striking and magnetizing functions can be realized by a single arc striking member, and there is no need to additionally set up a magnetizing block, so that the number of parts is small, the assembly is simple and convenient, and the cost can be reduced.

[0025] The circuit breaker proposed by the utility model is characterized in that a stopper is arranged in a base and below the moving contact by sliding along the Z axis; when the moving contact attracts the static contact to close the circuit, the moving contact can elastically press the stopper downward along the Z axis, so that the stopper will not interfere with the rotation of the moving contact and the circuit can be closed normally; when the moving contact disconnects the static contact to open the circuit, since the moving contact has no pressing effect on the stopper, the stopper can elastically slide upward along the Z axis to abut against the moving contact, that is, during the entire disconnection process of the moving contact, the stopper can always slide and abut against the moving contact to block the arc generated between the moving contact and the static contact when they are disconnected and repelled, so as to prevent the arc from passing through. The gap between the moving contact and the base is ejected toward the rear side toward the first end of the moving contact; on the one hand, it can avoid the reduction of air pressure in the arc extinguishing chamber caused by the arc ejected to the rear side, so as to ensure the speed of the arc moving forward to the arc extinguishing chamber; on the other hand, it can avoid bringing metal particles in the arc extinguishing chamber to the rear side and causing the operating mechanism on the rear side to be stuck; and it can avoid bringing high-temperature free gas in the arc extinguishing chamber to the rear side and affecting the insulation performance of the circuit breaker; thereby, the operating mechanism on the rear side can be better protected and the insulation performance of the circuit breaker will not be affected, and the arc extinguishing structure has a better arc extinguishing effect, so that the breaking performance of the entire circuit breaker can be better. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a cross-sectional view of the circuit breaker provided by the utility model;

[0027] Figure 2 It is a structural schematic diagram of the arc-starting member provided by the utility model;

[0028] Figure 3 It is a structural schematic diagram of the lower base provided by the utility model;

[0029] Figure 4 It is a structural schematic diagram of the baffle provided by the utility model.

[0030] In the figure:

[0031] 1. base; 11. lower base; 111. first limiting groove; 112. second limiting groove; 12. upper base;

[0032] 2. arc-starting member; 21. arc-starting plate; 22. magnetizing plate; 221. bottom plate; 2211. mounting hole; 222. bending boss;

[0033] 3. Stopper; 31. Baffle; 311. Connecting protrusion; 312. Cylindrical protrusion; 32. Elastic member;

[0034] 4. moving contact; 41. first end; 42. second end;

[0035] 5. Static contact; 6. Arc extinguishing chamber; 61. Arc extinguishing grid; 7. Operating mechanism. DETAILED DESCRIPTION

[0036] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0037] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0039] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0040] In the current arc extinguishing structure, the arc striking angle and the magnetizing block are two separately provided parts, which are cumbersome to assemble and the cost of providing the two parts is high, thus increasing the cost of the entire arc extinguishing structure and the molded case circuit breaker.

[0041] To this end, an arc extinguishing structure and a circuit breaker including the arc extinguishing structure are proposed in this embodiment; the arc extinguishing structure has a small number of parts, is simple and convenient to assemble, and has a low cost; at the same time, the arc extinguishing structure has good arc extinguishing performance, so that the circuit breaker has good breaking performance. In this embodiment, the circuit breaker can specifically be a molded case circuit breaker, and the main improvement in this embodiment lies in the arc extinguishing structure and the subsequent stopper. Other structures in the circuit breaker and the working principle of the circuit breaker are not described in detail here.

[0042] Specifically, Figure 1 and Figure 2 As shown, the arc extinguishing structure in this embodiment includes a base 1 and an arc-striking member 2; wherein, an arc-striking chamber 6 for extinguishing the arc is arranged in the base 1; the arc-striking member 2 is an integrally formed structure and is arranged in the base 1, and the arc-striking member 2 includes an arc-striking plate 21 and a magnetizing plate 22, the arc-striking plate 21 is arranged in the arc-striking chamber 6 for introducing the arc into the arc-striking chamber 6, the magnetizing plate 22 is used to be connected to the static contact 5 and can form a closed-loop magnetic conductive circuit, and the closed-loop magnetic conductive circuit can increase the magnetic field strength of the arc flowing through the magnetizing plate 22, thereby guiding the arc to better enter the arc-striking chamber 6.

[0043] Compared with the prior art, the arc extinguishing structure in this embodiment integrates the arc-starting plate 21 and the magnetizing plate 22 on an arc-starting member 2; the arc-starting member 2 is set as an integrally formed structure, and the arc-starting member 2 includes the arc-starting plate 21 and the magnetizing plate 22, and the arc-starting plate 21 is set in the arc-extinguishing chamber 6 for introducing the arc into the arc-extinguishing chamber 6, so as to realize the arc-starting function; at the same time, the magnetizing plate 22 is connected to the static contact 5 and can form a closed-loop magnetic conductive circuit to increase the magnetic field strength of the arc flowing through the magnetizing plate 22 to guide the arc into the arc-extinguishing chamber 6, thereby realizing the magnetic blowing function of the magnetizing block; the arc-starting member 2 with arc-starting function and magnetic blowing function and integrally formed is adopted, that is, the arc-starting and magnetizing functions can be realized by one part of the arc-starting member 2, and there is no need to set up an additional magnetizing block, so that the number of parts is small, the assembly is simple and convenient, and the cost can be reduced.

[0044] The arc-starting member 2 is made of a conductive and magnetic material, so that the arc-starting plate 21 can guide the arc, and a closed magnetic conductive circuit can be formed at the magnetizing plate 22. The specific material of the arc-starting member 2 is not limited, as long as it can be conductive and magnetic.

[0045] Specifically, Figure 2 As shown, the magnetizing plate 22 includes a base plate 221 and a bending boss 222. The bending bosses 222 are symmetrically arranged on opposite sides of the base plate 221. The bending bosses 222 are bent toward the center of the base plate 221, that is, the bending boss 222 and the opposite end of the base plate 221 are bent toward each other. A static contact 5 is accommodated between the base plate 221 and the bending boss 222 so as to form the above-mentioned closed-loop magnetic conductive circuit between the base plate 221 and the bending boss 222.

[0046] It is worth noting that if Figure 2 As shown, the bent boss 222 is bent toward the center of the bottom plate 221, so that the bent boss 222 can confine the magnetic flux lines between the bottom plate 221 and the bent boss 222, and prevent the magnetic flux lines from dispersing outward, thereby further increasing the magnetic field strength of the arc flowing through the magnetizing plate 22, so that the arc can enter the arc extinguishing chamber 6 more quickly and easily. A mounting hole 2211 is provided on the bottom plate 221, and the bottom plate 221 is riveted and fixed to the static contact 5 through the mounting hole 2211.

[0047] Furthermore, if Figure 1 and Figure 2 As shown, one end of the arc-striking plate 21 is connected to the base plate 221, and the other end of the arc-striking plate 21 extends obliquely to the bottom of the arc-extinguishing grid 61 in the arc-extinguishing chamber 6, and the arc-striking plate 21 is arranged parallel to the arc-extinguishing grid 61, so that the arc can be better introduced into the arc-extinguishing chamber 6 through the arc-striking plate 21, so that the arc-striking effect of the arc-striking plate 21 is better.

[0048] It is worth noting that the arc mentioned above refers to the arc generated when the moving contact 4 repels the static contact 5; since the moving contact 4 needs to pass through the opening position of the arc extinguishing chamber 6 to contact the static contact 5, and there is a gap between the moving contact 4 and the base 1, when the moving contact 4 repels, the generated arc is easy to be ejected from the opening position of the arc extinguishing chamber 6 and the gap between the moving contact 4 and the base 1 to the rear side of the circuit breaker, thereby affecting the operating mechanism 7 located at the rear side of the circuit breaker and the insulation performance of the circuit breaker. Among them, the operating mechanism 7 is a common operating structure in the circuit breaker.

[0049] In order to solve the above problems, Figure 1As shown, the circuit breaker in this embodiment also includes the above-mentioned moving contact 4, the above-mentioned static contact 5 and the stopper 3; wherein, the first end 41 of the moving contact 4 is rotatably arranged in the base 1 and is located on the rear side of the base 1, and the second end 42 of the moving contact 4 can be attracted or disconnected with the static contact 5, that is, the second end 42 of the moving contact 4 can be rotated to attract the static contact 5 to close the circuit or disconnect the static contact 5 to open the circuit, that is, the second end 42 of the moving contact 4 is located on the front side of the base 1; the stopper 3 is slidably arranged in the base 1 along the Z axis and is located below the moving contact 4; when closing the circuit, the moving contact 4 can elastically press the stopper 3 downward along the Z axis, so that the stopper 3 will not interfere with the rotation of the moving contact 4 during the closing process, and smooth closing can be ensured; when opening the circuit, the stopper 3 can elastically slide upward along the Z axis to abut against the moving contact 4, so as to prevent the arc in the arc extinguishing chamber 6 from spraying toward the first end 41 of the moving contact 4 to the rear side. Among them, the front side and the rear side mentioned above are specifically as follows Figure 1 The arrows in the figure show the front and back.

[0050] Compared with the prior art, the circuit breaker in this embodiment has an additional stopper 3 below the moving contact 4 that can always abut against the moving contact 4; when the moving contact 4 repels the stationary contact 5 to open the circuit, since the moving contact 4 has no pressing effect on the stopper 3 at this time, the stopper 3 can elastically slide upward along the Z axis to abut against the moving contact 4, that is, during the entire repelling and rotating process of the moving contact 4, the stopper 3 can always slide and abut against the moving contact 4 to block the arc generated between the moving contact 4 and the stationary contact 5 in the arc extinguishing chamber 6 when the moving contact 4 and the stationary contact 5 are disconnected and repelled, and prevent the arc from passing through the gap between the moving contact 4 and the base 1 Spraying toward the rear side toward the first end 41; on the one hand, it can avoid the reduction of gas pressure in the arc extinguishing chamber 6 caused by the arc being sprayed toward the rear side, so as to ensure the speed at which the arc moves toward the front side into the arc extinguishing chamber 6, thereby enhancing the gas blowing effect; on the other hand, it can avoid carrying metal particles in the arc extinguishing chamber 6 to the rear side and causing the operating mechanism 7 on the rear side to be stuck; and it can avoid carrying high-temperature free gas in the arc extinguishing chamber 6 to the rear side and affecting the insulation performance of the circuit breaker; thereby, the operating mechanism 7 on the rear side can be better protected and the insulation performance of the circuit breaker will not be affected, and the arc extinguishing structure can have a better arc extinguishing effect.

[0051] Specifically, Figure 1 , Figure 3 and Figure 4As shown, a first limiting groove 111 and a second limiting groove 112 are provided in the base 1, which are interconnected; the blocking member 3 includes a baffle 31 and an elastic member 32; wherein the baffle 31 is slidably connected in the first limiting groove 111 along the Z axis, the top of the baffle 31 can slide against the lower surface of the moving contact 4, and the opposite sides of the baffle 31 are respectively fixedly provided with connecting protrusions 311, which are located in the second limiting groove 112; the elastic member 32 is provided in the second limiting groove 112 and below the connecting protrusion 311, that is, the two ends of the elastic member 32 are respectively abutted against the groove bottom of the second limiting groove 112 and the connecting protrusion 311, and the elastic member 32 makes the baffle 31 abut against the moving contact 4. wherein, the material of the baffle 31 is an insulating material, so that the baffle 31 has insulating properties, and the elastic member 32 can be specifically a compression spring.

[0052] Specifically, when the switch is closed, the moving contact 4 presses the baffle 31 downward along the Z axis, so that the baffle 31 moves downward along the Z axis in the first limiting groove 111 to compress the elastic member 32; when the switch is opened, since the moving contact 4 does not apply a pressing effect on the baffle 31, the baffle 31 can automatically slide upward along the Z axis under the elastic force of the elastic member 32, so that the baffle 31 can slide and abut against the moving contact 4 during the rotation of the moving contact 4, so that the baffle 31 can be blocked at the gap between the moving contact 4 and the base 1 by the baffle 31.

[0053] It is worth noting that if Figure 1 and Figure 3 As shown, the base 1 specifically includes a lower base 11 and an upper base 12, and the upper base 12 is covered on the lower base 11 to form a complete structure of the base 1. The gap between the moving contact 4 and the base 1 mentioned above specifically refers to the gap between the moving contact 4 and the lower base 11, and the first limiting groove 111 and the second limiting groove 112 are both arranged in the lower base 11.

[0054] It is worth noting that in order to ensure that the second limiting groove 112 has a better limiting effect on the elastic member 32, when the elastic member 32 pushes the connecting protrusion 311 and the entire baffle 31 to move upward along the Z axis, the entire structure of the elastic member 32 is always located in the second limiting groove 112, that is, the top of the elastic member 32 will not protrude upward from the second limiting groove 112.

[0055] Specifically, Figure 3 and Figure 4 As shown, the connecting protrusion 311 is a cylindrical structure, and the shape of the second limiting groove 112 matches the shape of the connecting protrusion 311, that is, the second limiting groove 112 is also a cylindrical structure, so that the connecting protrusion 311 can slide more adaptably in the second limiting groove 112; and, since the baffle 31 is a plate-like structure, correspondingly, the shape of the first limiting groove 111 is a planar structure that matches the baffle 31.

[0056] Furthermore, if Figure 4 As shown, a cylindrical protrusion 312 is fixedly provided at the top end where the baffle 31 contacts the moving contact 4, and the cylindrical protrusion 312 slides against the lower surface of the moving contact 4; on the one hand, it can increase the structural strength of the entire baffle 3, and on the other hand, it can reduce the sliding friction between the top end of the baffle 31 and the lower surface of the moving contact 4 through the cylindrical protrusion 312, so as to reduce the wear on the moving contact 4, thereby better protecting the moving contact 4.

[0057] Specifically, there are multiple resist members 3 and arc extinguishing chambers 6 respectively, and the resist members 3 and the arc extinguishing chambers 6 are arranged one by one, that is, one resist member 3 is resisted between one arc extinguishing chamber 6 and one moving contact 4. Here, there is no limit on the number of resist members 3, which needs to be determined according to the arc extinguishing requirements and the number of arc extinguishing chambers 6.

[0058] The arc extinguishing structure in the present embodiment is realized by providing an arc-starting component 2 of an integrally formed structure, that is, the arc-starting component 2 can realize the functions of arc-starting and magnetization, and there is no need to provide an additional magnetization block, so that the number of parts is small, the assembly is simple and convenient, and the cost is low.

[0059] The circuit breaker in this embodiment, by setting a stopper 3 between the lower base 11 and the moving contact 4, can make the stopper 3 always slide and abut against the moving contact 4 when the moving contact 4 is pushed away, so as to prevent the arc in the arc extinguishing chamber 6 from being ejected toward the first end 41 through the gap between the moving contact 4 and the base 1 to the rear side, thereby enhancing the air blowing effect, protecting the operating mechanism 7 on the rear side of the circuit breaker and ensuring the insulation performance of the circuit breaker.

[0060] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. Arc extinguishing structure, characterized in that: include: A base (1) having an arc extinguishing chamber (6) disposed therein; The arc-striking member (2) is an integrally formed structure and is arranged in the base (1). The arc-striking member (2) comprises an arc-striking plate (21) and a magnetizing plate (22). The arc-striking plate (21) is arranged in the arc-extinguishing chamber (6) to introduce an arc into the arc-extinguishing chamber (6). The magnetizing plate (22) is used to connect with the stationary contact (5) and can form a closed-loop magnetic conductive circuit to guide the arc into the arc-extinguishing chamber (6).

2. The arc extinguishing structure according to claim 1, characterized in that: The arc-starting member (2) is made of a conductive and magnetic material.

3. The arc extinguishing structure according to claim 1 or 2, characterized in that: The magnetizing plate (22) comprises a bottom plate (221) and a bent boss (222), the bent bosses (222) being symmetrically arranged on opposite sides of the bottom plate (221), the bent bosses (222) being arranged to be bent towards each other at one end opposite to the bottom plate (221), and the static contact (5) is accommodated between the bottom plate (221) and the bent bosses (222).

4. The arc extinguishing structure according to claim 3, characterized in that: One end of the arc-striking plate (21) is connected to the bottom plate (221), the other end of the arc-striking plate (21) extends obliquely to below the arc-extinguishing grid (61) in the arc-extinguishing chamber (6), and the arc-striking plate (21) is arranged in parallel with the arc-extinguishing grid (61).

5. A circuit breaker, characterized in that The circuit breaker comprises an arc extinguishing structure as claimed in any one of claims 1 to 4, and further comprises: A moving contact (4) and a stationary contact (5), wherein the stationary contact (5) is located below the arc extinguishing chamber (6), a first end (41) of the moving contact (4) is rotatably disposed in the base (1), and a second end (42) of the moving contact (4) can be attracted or disconnected with the stationary contact (5); A stopper (3) is slidably arranged in the base (1) along the Z axis and is located below the moving contact (4). The stopper (3) abuts against the moving contact (4) along the Z axis to prevent the arc in the arc extinguishing chamber (6) from spraying toward the first end (41) of the moving contact (4).

6. The circuit breaker according to claim 5, characterized in that: The base (1) is provided with a first limiting groove (111) and a second limiting groove (112) which are connected to each other; the blocking member (3) comprises: A baffle (31) is slidably connected to the first limiting groove (111) along the Z axis, and connecting protrusions (311) are respectively provided on opposite sides of the baffle (31), and the connecting protrusions (311) are located in the second limiting groove (112); An elastic member (32) is arranged in the second limiting groove (112), and two ends of the elastic member (32) respectively abut against the groove bottom of the second limiting groove (112) and the connecting protrusion (311), and the elastic member (32) causes the baffle (31) to abut against the moving contact (4).

7. The circuit breaker according to claim 6, characterized in that: The connecting protrusion (311) is a cylindrical structure, and the shape of the second limiting groove (112) matches the shape of the connecting protrusion (311).

8. The circuit breaker according to claim 6, characterized in that: One end of the baffle (31) in contact with the moving contact (4) is provided with a cylindrical protrusion (312), and the cylindrical protrusion (312) abuts against the lower surface of the moving contact (4).

9. The circuit breaker according to any one of claims 6 to 8, characterized in that: The elastic member (32) is a compression spring.

10. The circuit breaker according to any one of claims 6 to 8, characterized in that: The resisting member (3) and the arc extinguishing chamber (6) are respectively provided in plurality, and the resisting member (3) and the arc extinguishing chamber (6) are provided in a one-to-one correspondence.

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