CN221176097U - Circuit breaker - Google Patents

Abstract

The application discloses a circuit breaker, which comprises a main module, wherein the main module comprises a first contact system, a magnetic protection system, a first arc extinguishing system, a first thermal protection system and a first arc striking area, wherein the magnetic protection system and the first thermal protection system are used for forcedly controlling the action of the first contact system, the magnetic protection system and the first arc extinguishing system are sequentially adjacent along a first direction, and the first arc extinguishing system, the first arc striking area and the first thermal protection system are sequentially arranged along a second direction, and are communicated with each other through the first arc striking area; the at least one auxiliary module is connected in series with the main module and comprises a second contact system and a second arc extinguishing system, the second contact system is connected with the first contact system in a linkage manner, the second contact system and the second arc extinguishing system are sequentially arranged along a first direction, and the length of the second arc extinguishing system is larger than that of the first arc extinguishing system along the first direction. The circuit breaker can improve the overall breaking capacity of the circuit breaker and reduce the manufacturing cost.

Description

Circuit breaker

Technical Field

The application belongs to the technical field of electrical equipment, and particularly relates to a circuit breaker.

Background

At present, a plurality of single-stage circuit breakers are generally adopted for series connection of the miniature direct current circuit breaker so as to form a multi-stage modularized circuit breaker, and the whole rated voltage of the circuit breaker is higher, so that the application range of the circuit breaker in the market is wider.

However, the modules at each stage of the multistage modularized miniature circuit breaker are provided with the thermomagnetic protection modules in the complete circuit breaker, and the thermomagnetic protection modules occupy a larger space inside the circuit breaker, so that the space of the arc extinguishing grid plate is insufficient, the breaking capacity of the circuit breaker is insufficient, and the thermomagnetic protection modules are arranged at each stage, so that the overall cost of the circuit breaker is increased.

Disclosure of utility model

The application provides a circuit breaker, which can improve the integral breaking capacity of the circuit breaker and reduce the manufacturing cost.

The application provides a circuit breaker, which comprises: the main module comprises a first contact system, a magnetic protection system, a first arc extinguishing system, a first thermal protection system and a first arc striking area, wherein the magnetic protection system and the first thermal protection system are all used for forcedly controlling the action of the first contact system, the magnetic protection system and the first arc extinguishing system are arranged adjacently in sequence along a first direction, the first arc extinguishing system, the first arc striking area and the first thermal protection system are arranged in sequence along a second direction, and the first contact system and the first arc extinguishing system are communicated through the first arc striking area; at least one auxiliary module, all be connected in series with the main module along the third direction, auxiliary module includes second contact system and second arc extinguishing system, and second contact system links with first contact system and is connected, and second contact system sets gradually along first direction with second arc extinguishing system, and along first direction, and second arc extinguishing system's length is greater than first arc extinguishing system's length.

The circuit breaker as above, wherein the second arc extinguishing system comprises a first arc extinguishing chamber and a second arc extinguishing chamber which are connected and arranged, the first arc extinguishing chamber extends along a first direction, the second arc extinguishing chamber extends along a second direction, and on a plane vertical to a third direction, the projection of the second arc extinguishing chamber and the projection of the first arc striking area at least partially overlap.

The circuit breaker as above, wherein the projection of the second arc chute is disposed at least partially overlapping the projection of the first thermal protection system in a plane perpendicular to the third direction.

The circuit breaker as above, wherein the auxiliary module further comprises a first air outlet and a second air outlet, the first air outlet and the second air outlet are respectively arranged on two sides of the auxiliary module, the first air outlet is communicated with the outlet of the first arc-extinguishing chamber, and the second air outlet is communicated with the second arc-extinguishing chamber.

The circuit breaker comprises a first arc-extinguishing chamber, a second arc-extinguishing chamber and a first arc-extinguishing chamber, wherein the first arc-extinguishing chamber comprises a plurality of grid plates which are arranged at intervals along a first direction, the second arc-extinguishing chamber comprises a plurality of grid plates which are arranged at intervals along a second direction, and the arrangement direction of the grid plates is gradually changed from the first direction to the second direction at the joint of the first arc-extinguishing chamber and the second arc-extinguishing chamber.

The circuit breaker as above, wherein the second arc extinguishing system comprises a third arc extinguishing chamber arranged extending in the first direction, the projection of the third arc extinguishing chamber being arranged to at least partially overlap the projection of the magnetic protection system on a plane perpendicular to the third direction.

The circuit breaker above, wherein, auxiliary module still includes the third gas outlet, and the third explosion chamber includes a plurality of bars that set up along first direction interval, and the extending direction of a plurality of bars all is the angle of predetermineeing with the second direction, and the setting that one side along the second direction and be linked together with the third explosion chamber is located to the third gas outlet.

The circuit breaker as above, wherein the auxiliary module further comprises a second thermal protection system, the second thermal protection system and the third arc extinguishing chamber being sequentially arranged along the second direction.

The circuit breaker as above, wherein the auxiliary module further comprises a linkage shaft, the first contact system comprises a first moving contact and a first fixed contact, the first moving contact can rotate to be in contact with or separated from the first fixed contact, the second contact system comprises a second moving contact and a second fixed contact, the second moving contact can rotate to be in contact with or separated from the second fixed contact, one end of the linkage shaft is connected with the first moving contact, and the other end of the linkage shaft is connected with the second moving contact.

The circuit breaker above, wherein, auxiliary module still includes the striking subassembly, and the striking subassembly is including first striking piece and the second striking piece that separates the setting mutually, and first striking piece and second striking piece are located the both sides of second arc extinguishing system respectively, and first striking piece still is connected with first stationary contact's setting.

The circuit breaker comprises a main module and at least one auxiliary module, wherein the main module comprises a first contact system, a magnetic protection system, a first arc extinguishing system, a first thermal protection system and a first arc striking area, and the auxiliary module comprises a second contact system and a second arc extinguishing system, wherein the second contact system can be connected with the first contact system in a linkage manner so as to synchronously switch on or synchronously switch off, so that the circuit breaker can realize integral breaking of the main module and the auxiliary module when the auxiliary module is not provided with the magnetic protection system and the first thermal protection system, and the contact system, the magnetic protection system and the first arc extinguishing system of the main module are arranged adjacently in sequence along a first direction.

Drawings

In order to more clearly illustrate the technical solution of the embodiments of the present application, the drawings that are needed to be used in the embodiments of the present application will be briefly described, and it is possible for a person skilled in the art to obtain other drawings according to these drawings without inventive effort.

Fig. 1 is a schematic structural view of an auxiliary module of a circuit breaker according to an embodiment of the present application;

Fig. 2 is a schematic structural view of a main module of the circuit breaker according to the embodiment of the present application;

Fig. 3 is a schematic structural view of an auxiliary module of a circuit breaker according to another embodiment of the present application;

fig. 4 is a schematic structural diagram of the main module and the auxiliary module of the circuit breaker according to the embodiment of the present application;

Fig. 5 is a schematic diagram of the main module and an auxiliary module of the circuit breaker according to the embodiment of the present application;

fig. 6 is a schematic diagram of the cooperation of the main module and two auxiliary modules of the circuit breaker according to the embodiment of the present application.

Reference numerals illustrate:

10. A main module; 11. a first contact system; 111. a first moving contact; 112. a first stationary contact; 12. a magnetic protection system; 13. a first arc extinguishing system; 14. a first thermal protection system; 15. a first arc striking region; 20. an auxiliary module; 21. a second contact system; 211. a second moving contact; 212. a second stationary contact; 22. a second arc extinguishing system; 221. a first arc extinguishing chamber; 222. a second arc extinguishing chamber; 223. a third arc extinguishing chamber; 23. a first air outlet; 24. a second air outlet; 25. a third air outlet; 26. a linkage shaft; 27. an arc striking assembly; 271. a first striking plate; 272. a second striking plate; 273. a second arc striking area; 274. a third arc striking area; 28. a connection terminal; 29. a second thermal protection system;

X, a first direction; y, second direction; z, third direction.

Detailed Description

Features and exemplary embodiments of various aspects of the present application will be described in detail below, and in order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be described in further detail below with reference to the accompanying drawings and the detailed embodiments. It should be understood that the particular embodiments described herein are meant to be illustrative of the application only and not limiting. It will be apparent to one skilled in the art that the present application may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the application by showing examples of the application.

As shown in fig. 1 to 6, an embodiment of the present application provides a circuit breaker, including: the main module 10 comprises a first contact system 11, a magnetic protection system 12, a first arc extinguishing system 13, a first thermal protection system 14 and a first arc striking area 15, wherein the magnetic protection system 12 and the first thermal protection system 14 are all used for forcedly controlling the action of the first contact system 11, the magnetic protection system 12 and the first arc extinguishing system 13 are sequentially arranged adjacently along a first direction X, the first arc extinguishing system 13, the first arc striking area 15 and the first thermal protection system 14 are sequentially arranged along a second direction Y, the first contact system 11 and the first arc extinguishing system 13 are communicated through the first arc striking area 15, and an arc generated by breaking of the first contact system 11 can enter the first arc extinguishing system 13 through the first arc striking area 15 for arc extinguishing; at least one auxiliary module 20 is connected in series with the main module 10 along the third direction Z, the auxiliary module 20 comprises a second contact system 21 and a second arc extinguishing system 22, the second contact system 21 is connected with the first contact system 11 in a linkage manner, the second contact system 21 and the second arc extinguishing system 22 are sequentially arranged along the first direction X, and the length of the second arc extinguishing system 22 is greater than that of the first arc extinguishing system 13 along the first direction X. It should be noted that, the first direction X, the second direction Y, and the third direction Z are perpendicular to each other, and the specific directions are shown in fig. 2 and 4.

In particular, the circuit breaker according to the embodiment of the present application includes a main module 10 and at least one auxiliary module 20 connected in series with the main module 10, where the main module 10 and the at least one auxiliary module 20 can form a multipole circuit breaker, so that the circuit breaker can be applied to circuits with different load devices, fig. 5 shows a bipolar circuit breaker formed by one main module 10 and one auxiliary module 20, fig. 6 shows a tripolar circuit breaker formed by one main module 10 and two auxiliary modules 20, and the installation positions of the main module 10 and the auxiliary module 20 in the multipole circuit breaker in fig. 5 and 6 can be changed arbitrarily.

The main module 10 comprises a first contact system 11, a magnetic protection system 12, a first arc extinguishing system 13, a first thermal protection system 14 and a first arc striking area 15, the auxiliary module 20 only comprises a second contact system 21 and a second arc extinguishing system 22, and the second contact system 21 can be connected with the first contact system 11 in a linkage way so as to synchronously switch on or synchronously switch off, so that the auxiliary module 20 can act on the magnetic protection system 12 or the first thermal protection system 14 of the main module 10 when the magnetic failure or the thermal failure occurs in the breaker under the condition that the magnetic protection system 12 and the first thermal protection system 14 are canceled, so that the first contact system 11 is disconnected and the second contact system 21 is driven to be disconnected, and the whole disconnection of the breaker is realized. Therefore, the circuit breaker of the embodiment of the application cancels the arrangement of the protection system in the auxiliary module 20 while ensuring the breaking capacity of the circuit breaker, and reduces the manufacturing cost of the auxiliary module 20.

Because the first contact system 11, the magnetic protection system 12 and the first arc extinguishing system 13 of the main module 10 are sequentially and adjacently arranged along the first direction X, the auxiliary module 20 can enable the length of the second arc extinguishing system 22 along the first direction X to be greater than the length of the first arc extinguishing system 13 along the first direction X under the condition of canceling the magnetic protection system 12, so that the arc extinguishing effect is improved, and the overall breaking capacity of the circuit breaker is improved.

As shown in fig. 1, the circuit breaker according to the embodiment of the present application, wherein the second arc extinguishing system 22 includes a first arc extinguishing chamber 221 and a second arc extinguishing chamber 222 which are disposed in a connected manner, the first arc extinguishing chamber 221 is disposed to extend along a first direction X, the second arc extinguishing chamber 222 is disposed to extend along a second direction Y, and a projection of the second arc extinguishing chamber 222 is disposed to at least partially overlap a projection of the first arc striking area 15 on a plane perpendicular to a third direction Z.

In particular, due to the arrangement that the projection of the second arc extinguishing chamber 222 at least partially overlaps the projection of the first arc striking area 15, the overall length of the second arc extinguishing chamber 222 is increased in the second direction Y, so that the overall capacity of the second arc extinguishing system 22 is increased, the arc extinguishing effect is improved, and the overall breaking capacity of the circuit breaker is improved.

Specifically, a second arc striking area 273 is disposed between the second arc extinguishing chamber 222 and the second contact system 21, the area of the second arc striking area 273 is smaller than that of the first arc striking area 15, and the second arc striking area 273 is used for introducing an arc generated by breaking the second contact system 21 into the second arc extinguishing chamber 222.

As shown in fig. 1, the circuit breaker of the embodiment of the present application is arranged such that the projection of the second arc chute 222 at least partially overlaps the projection of the first thermal protection system 14 in a plane perpendicular to the third direction Z.

In particular, because the projection of the second arc extinguishing chamber 222 is at least partially overlapped with the projection of the first thermal protection system 14, the overall length of the second arc extinguishing chamber 222 is further increased in the second direction Y, so that the overall capacity of the second arc extinguishing system 22 is increased, the arc extinguishing effect is improved, and the overall breaking capacity of the circuit breaker is improved.

As shown in fig. 1, the circuit breaker according to the embodiment of the present application further includes a first air outlet 23 and a second air outlet 24, where the first air outlet 23 and the second air outlet 24 are respectively disposed on two sides of the auxiliary module 20, the first air outlet 23 is disposed in communication with an outlet of the first arc extinguishing chamber 221, and the second air outlet 24 is disposed in communication with the second arc extinguishing chamber 222.

In particular, the auxiliary module 20 has the first arc-extinguishing chamber 221 and the second arc-extinguishing chamber 222, and the extension directions of the two arc-extinguishing chambers are different, so that the discharge directions of the gas after arc extinction are different, therefore, the circuit breaker of the application is respectively communicated with the first arc-extinguishing chamber 221 and the second arc-extinguishing chamber 222 by arranging the first air outlet 23 and the second air outlet 24 which are positioned on two sides of the auxiliary module 20, and ensures that the gas after arc extinction of the first arc-extinguishing chamber 221 and the second arc-extinguishing chamber 222 can be smoothly discharged, thereby avoiding the condition that the gas with the ions stays in the auxiliary module 20 and damages other internal parts.

As shown in fig. 1, in the circuit breaker according to the embodiment of the present application, the first arc-extinguishing chamber 221 includes a plurality of gate sheets disposed at intervals along the first direction X, the second arc-extinguishing chamber 222 includes a plurality of gate sheets disposed at intervals along the second direction Y, and at the connection between the first arc-extinguishing chamber 221 and the second arc-extinguishing chamber 222, the arrangement direction of the plurality of gate sheets is gradually changed from the first direction X to the second direction Y.

During the concrete implementation, the arrangement of the multiple grid plates of the first arc-extinguishing chamber 221 and the second arc-extinguishing chamber 222 gradually changes the arrangement direction, so that the continuity of the first arc-extinguishing chamber 221 and the second arc-extinguishing chamber 222 is guaranteed, a closed arc-extinguishing chamber structure is formed, the electric arcs in the second arc striking area 273 can completely enter the arc-extinguishing chamber structure to extinguish the arc, the continuous arc-extinguishing chamber structure can elongate the electric arcs, the integral arc-extinguishing effect is improved, and the integral breaking capacity of the circuit breaker is improved.

As shown in fig. 3, the circuit breaker according to another embodiment of the present application, wherein the second arc extinguishing system 22 comprises a third arc extinguishing chamber 223 arranged extending along the first direction X, the projection of the third arc extinguishing chamber 223 being arranged at least partially overlapping the projection of the magnetic protection system 12 in a plane perpendicular to the third direction Z.

In particular, because the projection of the third arc extinguishing chamber 223 and the projection of the magnetic protection system 12 are at least partially overlapped, the length of the third arc extinguishing chamber 223 is increased in the first direction X, so that the overall capacity of the second arc extinguishing system 22 is increased, the overall arc extinguishing effect can be improved, and the overall breaking capacity of the circuit breaker is improved.

As shown in fig. 3, in the circuit breaker according to the embodiment of the present application, the auxiliary module 20 further includes a third air outlet 25, the third arc extinguishing chamber 223 includes a plurality of grid plates disposed at intervals along the first direction X, the extending directions of the plurality of grid plates all form a preset angle with the second direction Y, and the third air outlet 25 is disposed on a side surface of the auxiliary module 20 along the second direction Y and is in communication with the third arc extinguishing chamber 223.

In specific implementation, the grating sheet of the third arc-extinguishing chamber 223 extends and sets at a preset angle with the second direction Y, so that the gas formed by the arc after the arc extinguishing of the third arc-extinguishing chamber 223 can be discharged to the third gas outlet 25 along the direction at the preset angle with the second direction Y, and is discharged to the outside of the circuit breaker through the third gas outlet 25, thereby avoiding the gas with the ions from being detained in the circuit breaker and breaking down again, and damaging the internal structure of the circuit breaker.

As shown in fig. 3, the circuit breaker according to the embodiment of the present application, wherein the auxiliary module 20 further includes a second thermal protection system 29, and the second thermal protection system 29 and the third arc extinguishing chamber 223 are sequentially disposed along the second direction Y.

In particular, by providing the second thermal protection system 29 inside the auxiliary module 20, the auxiliary module 20 and the main module 10 can have a thermal protection effect at the same time under the condition of guaranteeing breaking capacity, and the overall thermal protection effect of the circuit breaker is improved.

Specifically, a third arc striking area 274 is arranged between the third arc extinguishing chamber 223 and the second thermal protection system 29, the arc generated by breaking the second contact system 21 passes through the third arc striking area 274 and enters the third arc extinguishing chamber 223 to extinguish the arc, and the area of the third arc striking area 274 is equal to that of the first arc striking area 15.

As shown in fig. 1 to 4, in the circuit breaker according to the embodiment of the present application, the auxiliary module 20 further includes a linkage shaft 26, the first contact system 11 includes a first moving contact 111 and a first fixed contact 112, the first moving contact 111 is rotatably disposed, the first moving contact 111 is rotatable to be in contact with or separated from the first fixed contact 112, the second contact system 21 includes a second moving contact 211 and a second fixed contact 212, the second moving contact 211 is rotatably disposed, the second moving contact 211 is rotatable to be in contact with or separated from the second fixed contact 212, and one end of the linkage shaft 26 is connected to the first moving contact 111, and the other end is connected to the second moving contact 211.

In particular, under the connection of the linkage shaft 26, the first moving contact 111 and the second moving contact 211 can synchronously rotate, when the magnetic protection system 12 and the first thermal protection system 14 of the main module 10 operate, the first moving contact 111 can rotate to be separated from the first fixed contact 112, at this time, the first contact system 11 is in a breaking state, the second moving contact 211 can also rotate along with the first moving contact 111 and rotate to be separated from the second fixed contact 212, at this time, the second contact system 21 is also in a breaking state, so as to realize the function of synchronous breaking of the main module 10 and the auxiliary module 20 of the circuit breaker and performing short-circuit protection.

As shown in fig. 1, in the circuit breaker according to the embodiment of the present application, the auxiliary module 20 further includes an arc striking assembly 27, the arc striking assembly 27 includes a first arc striking plate 271 and a second arc striking plate 272 that are separately disposed, the first arc striking plate 271 and the second arc striking plate 272 are respectively disposed on two sides of the second arc extinguishing system 22, and the first arc striking plate 271 is further connected with the first fixed contact 112.

In specific implementation, the arrangement of the first striking plate 271 and the second striking plate 272 on two sides of the second arc extinguishing system 22 can guide the electric arc generated by breaking the second contact system 21 to two ends of the second arc extinguishing system 22, so that the electric arc is integrally elongated, the second arc extinguishing system 22 can completely extinguish the electric arc, the integral arc extinguishing effect is improved, and the integral breaking capacity of the circuit breaker is improved.

Moreover, the first striking plate 271, the second striking plate 272, the second contact system 21 and the second arc extinguishing system 22 can form a complete electric circuit, the first striking plate 271, the second striking plate 272 and the second contact system 21 are connected, current can pass through the first striking plate 271, the second striking plate 272 and the second contact system 21, an electric arc formed by the second contact system 21 can enter the second arc extinguishing system 22, two ends of the electric arc can be respectively contacted with the first striking plate 271 and the second striking plate 272, and the electric arc in the second arc extinguishing system 22 and the current of the first striking plate 271, the second striking plate 272 and the second contact system 21 jointly form a complete electric circuit.

Specifically, the auxiliary module 20 further includes two connection terminals 28, and the two connection terminals 28 are respectively disposed on two sides of the auxiliary module 20 along the second direction Y, for electrically connecting with an external load device.

It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

In the foregoing, only the specific embodiments of the present application are described, and it will be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the systems, modules and units described above may refer to the corresponding processes in the foregoing method embodiments, which are not repeated herein. It should be understood that the scope of the present application is not limited thereto, and any equivalent modifications or substitutions can be easily made by those skilled in the art within the technical scope of the present application, and they should be included in the scope of the present application.

Claims (10)

1. A circuit breaker, comprising:

The main module (10) comprises a first contact system (11), a magnetic protection system (12), a first arc extinguishing system (13), a first thermal protection system (14) and a first arc striking area (15), wherein the magnetic protection system (12) and the first thermal protection system (14) are both used for forcedly controlling the action of the first contact system (11), the magnetic protection system (12) and the first arc extinguishing system (13) are sequentially arranged adjacently along a first direction (X), the first arc extinguishing system (13), the first arc striking area (15) and the first thermal protection system (14) are sequentially arranged along a second direction (Y), and the first contact system (11) and the first arc extinguishing system (13) are arranged in a communicated mode through the first arc striking area (15);

At least one auxiliary module (20), all along third direction (Z) with main module (10) series connection, auxiliary module (20) include second contact system (21) and second arc extinguishing system (22), second contact system (21) with be connected that first contact system (11) links mutually, second contact system (21) with second arc extinguishing system (22) are followed first direction (X) sets gradually, and follows first direction (X), the length of second arc extinguishing system (22) is greater than the length of first arc extinguishing system (13).

2. The circuit breaker according to claim 1, characterized in that the second arc extinguishing system (22) comprises a first arc extinguishing chamber (221) and a second arc extinguishing chamber (222) arranged in connection, the first arc extinguishing chamber (221) being arranged extending in the first direction (X), the second arc extinguishing chamber (222) being arranged extending in the second direction (Y), the projection of the second arc extinguishing chamber (222) being arranged at least partially overlapping the projection of the first arcing zone (15) on a plane perpendicular to the third direction (Z).

3. The circuit breaker according to claim 2, characterized in that the projection of the second arc extinguishing chamber (222) is arranged at least partially overlapping the projection of the first thermal protection system (14) on a plane perpendicular to the third direction (Z).

4. The circuit breaker according to claim 2, characterized in that the auxiliary module (20) further comprises a first air outlet (23) and a second air outlet (24), the first air outlet (23) and the second air outlet (24) being provided on both sides of the auxiliary module (20), respectively, the first air outlet (23) being in communication with the outlet of the first arc-extinguishing chamber (221), the second air outlet (24) being in communication with the second arc-extinguishing chamber (222).

5. The circuit breaker according to claim 2, wherein the first arc-extinguishing chamber (221) comprises a plurality of grid plates arranged at intervals along the first direction (X), the second arc-extinguishing chamber (222) comprises a plurality of grid plates arranged at intervals along the second direction (Y), and the arrangement direction of the grid plates is gradually changed from the first direction (X) to the second direction (Y) at the connection part of the first arc-extinguishing chamber (221) and the second arc-extinguishing chamber (222).

6. The circuit breaker according to claim 1, characterized in that the second arc extinguishing system (22) comprises a third arc extinguishing chamber (223) arranged extending along the first direction (X), a projection of the third arc extinguishing chamber (223) overlapping at least partially a projection of the magnetic protection system (12) on a plane perpendicular to the third direction (Z).

7. The circuit breaker according to claim 6, wherein the auxiliary module (20) further comprises a third air outlet (25), the third arc extinguishing chamber (223) comprises a plurality of grid plates arranged at intervals along the first direction (X), the extending directions of the grid plates are all at a preset angle with the second direction (Y), and the third air outlet (25) is arranged on one side surface of the auxiliary module (20) along the second direction (Y) and is communicated with the third arc extinguishing chamber (223).

8. Circuit breaker according to claim 7, characterized in that the auxiliary module (20) further comprises a second thermal protection system (29), the second thermal protection system (29) being arranged in succession with the third arc extinguishing chamber (223) along the second direction (Y).

9. The circuit breaker according to claim 1, characterized in that the auxiliary module (20) further comprises a linkage shaft (26), the first contact system (11) comprises a first moving contact (111) and a first stationary contact (112), the first moving contact (111) is rotatably arranged, the first moving contact (111) is rotatable to a contact or a separation arrangement with the first stationary contact (112), the second contact system (21) comprises a second moving contact (211) and a second stationary contact (212), the second moving contact (211) is rotatably arranged, the second moving contact (211) is rotatable to a contact or separation arrangement with the second stationary contact (212), one end of the linkage shaft (26) is connected with the first moving contact (111), and the other end is connected with the second moving contact (211).

10. The circuit breaker according to claim 9, wherein the auxiliary module (20) further comprises an arc striking assembly (27), the arc striking assembly (27) comprises a first arc striking plate (271) and a second arc striking plate (272) which are arranged separately, the first arc striking plate (271) and the second arc striking plate (272) are respectively arranged at two sides of the second arc extinguishing system (22), and the first arc striking plate (271) is further connected with the first fixed contact (112).