circuit breaker

Abstract

A circuit breaker includes at least two parallel circuit breaker poles, each circuit breaker pole including a housing. The housings of all circuit breaker poles are assembled to form an outer casing. Each housing contains an operating mechanism and a contact system. The operating mechanism includes a lever, and the contact system includes a cooperating moving contact assembly and two stationary contacts. The lever and the moving contact assembly are rotatably mounted between a pair of mounting sidewalls of the housing. The circuit breaker also includes at least one linkage member, whose two ends are respectively linked to the lever and the moving contact assembly. When the operating mechanism is driven, the linkage member moves along a plane parallel to the mounting sidewalls on the outer surface of the mounting sidewalls. This invention simplifies the structure of the operating mechanism. Furthermore, each circuit breaker pole has a housing, and the linkage member between the lever and the moving contact assembly is located outside the housing, facilitating modular assembly. The linkage member's range of motion is located on the outer surface of the housing, which helps reduce the overall size.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical appliances, specifically to a circuit breaker. Background Technology

[0002] A circuit breaker is a switching device used to disconnect and connect load circuits, as well as to disconnect faulty circuits to prevent the escalation of accidents, thereby ensuring the safe operation of load circuits. In existing circuit breakers, the operating mechanism is driven and connected to at least one contact system via a linkage, and the remaining contact systems operate synchronously through linkage. Existing operating mechanisms have a large number of components and complex coordination relationships, especially when used with double-break contact systems, which presents the following drawbacks:

[0003] First, when the operating mechanism drives a rotary double-break contact system, its trip latch, locking latch, etc., are all assembled with a shaft-like structure, which requires a large space and is not conducive to forming a modular structure, making assembly difficult. Second, when the operating mechanism drives a swing contact system, its trip latch and locking latch are stacked and rotated on the lever, which is relatively simple in structure, but is limited by the structure that the moving contact is usually coaxially rotated and assembled with the lever, making it difficult to apply this type of operating mechanism to a rotary double-break contact system. Third, the linkage between the operating mechanism and the contact system is usually located inside the housing, which requires sufficient space to move inside, which is not conducive to reducing the overall size of the circuit breaker. Summary of the Invention

[0004] The purpose of this utility model is to overcome at least one defect of the prior art and provide a circuit breaker.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] This utility model provides a circuit breaker, including at least two parallel circuit breaker poles, each circuit breaker pole including a housing, and the housings of all circuit breaker poles are assembled to form an outer shell. Each housing is provided with an operating mechanism and a contact system. The operating mechanism includes a lever, and the contact system includes a cooperating moving contact assembly and two stationary contacts. The lever and the moving contact assembly are rotatably mounted between a pair of mounting sidewalls of the housing. It also includes at least one linkage member, the two ends of which are respectively linked to the lever and the moving contact assembly. When the operating mechanism is driven, the linkage member moves along a plane parallel to the mounting sidewall on the outer surface of the mounting sidewall.

[0007] Preferably, a first linkage rod is linked between two adjacent moving contact assemblies, the lever is connected to a second linkage rod, and the mounting side wall of the housing is provided with a first mating hole and a second mating hole. The first linkage rod and the second linkage rod pass through the first mating hole and the second mating hole respectively and are connected to the two ends of the linkage component.

[0008] Preferably, the moving contact assembly includes a rotating shaft, the mounting surface of which is rotatably mounted on the mounting sidewall, and a first linkage hole is provided on the mounting surface of the rotating shaft at a position off-center from the axis, and the first linkage rod is assembled in the first linkage hole.

[0009] Preferably, the lever is provided with a second linkage hole for assembling the second linkage rod, and a jump buckle and a lock buckle are respectively rotatably mounted on the lever. One end of the jump buckle and the lock buckle are fastened together, and the other end of the lock buckle is provided with an unlocking part. The unlocking part swings in a drive hole opened on the mounting side wall.

[0010] Preferably, a track groove is provided on the outer surface of at least one mounting sidewall of the housing, the linkage is located in the track groove, and the track groove restricts the movement trajectory of the linkage.

[0011] Preferably, the depth of the track groove is less than the thickness of the mounting sidewall.

[0012] Preferably, each housing has operating holes at both ends, and the housing sidewall connecting the two operating holes protrudes outward to form a mounting portion, and an operating mechanism is provided in the mounting portion of at least one housing.

[0013] Preferably, each housing is further provided with a protection mechanism, which includes a short-circuit protection mechanism and / or an overload protection mechanism. The short-circuit protection mechanism and the overload protection mechanism are arranged in parallel and cooperate with the unlocking part to trigger the operating mechanism to trip.

[0014] Preferably, the protective mechanism is laterally disposed on the housing between the operating hole and the mounting portion, and the protective mechanism extends toward the operating mechanism.

[0015] The short-circuit protection mechanism and the overload protection mechanism are housed in the same housing.

[0016] Alternatively, one housing may contain only short-circuit protection, while another housing may contain only overload protection.

[0017] Preferably, at least one of the operating holes and the mounting portion is provided with an adjustment hole on the housing sidewall, the adjustment hole corresponding to the adjustment screw of the overload protection mechanism.

[0018] The circuit breaker of this utility model simplifies the structure of the operating mechanism by driving a rotary double-break contact system through a lever of the operating mechanism. At the same time, each circuit breaker pole has a housing, and the linkage between the lever and the moving contact assembly is set outside the housing, which facilitates the formation of a modular structure for assembly. In addition, the range of motion of the linkage is located on the outer surface of the housing, which can save the internal space of each housing and help to reduce the overall size.

[0019] In addition, the housing is equipped with a track groove, which restricts the movement trajectory of the linkage, thus helping to ensure the stability of the linkage, the lever, the moving contact assembly, and the linkage.

[0020] In addition, the housing forms a mounting section for assembling the operating mechanism, which provides installation space for the operating mechanism, facilitating the formation of a modular structure and making assembly convenient.

[0021] In addition, each circuit breaker pole is equipped with a protection mechanism. The horizontally arranged protection mechanism helps to reduce the width of each circuit breaker pole. At the same time, the short-circuit protection mechanism and the overload protection mechanism can be set in the same circuit breaker pole to improve safety, or they can be set in two separate circuit breaker poles to reduce the number of protection mechanisms and lower costs. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the circuit breaker of this utility model;

[0023] Figure 2 This is a schematic diagram of the structure of one circuit breaker pole in this utility model;

[0024] Figure 3 This is a schematic diagram of the linkage structure of the two circuit breaker poles in this utility model;

[0025] Figure 4 This is a schematic diagram of the structure of the mounting sidewall in this utility model;

[0026] Figure 5 This is a schematic diagram of the internal structure of the circuit breaker pole of this utility model (with the overload protection mechanism removed);

[0027] Figure 6 This is a schematic diagram of the internal structure of the circuit breaker pole of this utility model (removed short-circuit protection mechanism);

[0028] Figure 7 This is a schematic diagram of the structure of the protection mechanism, contact system, and arc extinguishing system in this utility model. Figure 1 ;

[0029] Figure 8 This is a schematic diagram of the structure of the protection mechanism, contact system, and arc extinguishing system in this utility model. Figure 2 ;

[0030] Figure label:

[0031] 10-Circuit breaker pole, 11-Housing, 111-Terminal, 112-Operating terminal, 113-Operating hole, 114-Adjusting hole, 115-Connecting port, 117-Air outlet, 12-Housing, 121-Mounting side wall, 1211-First mating hole, 1212-Second mating hole, 122-Mounting part, 124-Trajectory groove, 2-Operating mechanism, 234-Unlocking part, 31-Moving contact assembly, 311-Moving contact bridge, 312-Rotating shaft, 321-First stationary contact, 322-Second stationary contact, 4-Arc extinguishing system, 41-Arc extinguishing chamber, 42-Exhaust passage, 43-Stationary arc ignition plate, 5-Short circuit protection mechanism, 6-Overload protection mechanism, 7-Terminal, 70-Conductive plate, 8-Handle mechanism, 91-First linkage rod, 92-Second linkage rod, 93-Linkage component. Detailed Implementation

[0032] The specific embodiments of the circuit breaker of this utility model are further described below with reference to the accompanying drawings. The circuit breaker of this utility model is not limited to the descriptions in the following embodiments.

[0033] like Figure 1 , 2 As shown, the circuit breaker includes a housing, within which an operating mechanism 2 and at least two parallel circuit breaker poles are disposed. Each circuit breaker pole includes a pair of terminals 7. Between the pair of terminals 7, a contact system and an arc extinguishing system 4 are provided. The contact system includes a moving contact assembly 31 and a stationary contact that cooperate with each other. The moving contact assembly 31 is driven and connected to the operating mechanism 2. The operating mechanism 2 drives the moving contact assembly 31 to contact or separate from the stationary contact, thereby connecting or disconnecting the main line of the circuit breaker pole. The arc extinguishing system 4 is configured in conjunction with the contact system to extinguish the arc generated by the contact system disconnection.

[0034] Specifically, the operating mechanism 2 includes a rotating lever, on which a jumper and a lock are respectively rotatably mounted. One end of the jumper and the lock are fastened together. The lever is connected to the moving contact assembly 31 of at least one circuit breaker pole. The moving contact assemblies 31 of the other circuit breaker poles can be interconnected, so that the operating mechanism 2 can synchronously drive the moving contact assemblies 31 of all circuit breaker poles to move synchronously.

[0035] The contact system is a rotary double-break structure. The contact system includes a moving contact assembly 31 and two stationary contacts. The moving contact assembly 31 is rotatably mounted between the two stationary contacts, and the two stationary contacts are distributed on opposite sides of the contact mechanism in a rotationally symmetrical structure. The moving contact assemblies 31 of two adjacent circuit breaker poles are linked together, thereby realizing the synchronous operation of the moving contacts of all circuit breaker poles.

[0036] Furthermore, each circuit breaker pole also includes a housing 12, which includes a pair of spaced-apart mounting sidewalls 121. When two adjacent circuit breaker poles are assembled together through the housings 12, the mounting sidewalls 121 of the two adjacent housings 12 fit together. The housings 12 of all circuit breaker poles are assembled to form the outer shell 11 of the circuit breaker. A pair of terminals 7 are correspondingly disposed at opposite ends within the housing 12. The contact system and the arc extinguishing system 4 are disposed between the two mounting sidewalls 121 between the pair of terminals 7. Preferably, each circuit breaker pole is provided with an operating mechanism 2. The lever of each operating mechanism 2 and each moving contact assembly 31 are rotatably assembled between a pair of mounting sidewalls 121 of a housing 12. Of course, all circuit breaker poles can share one operating mechanism 2. In this case, the operating mechanism 2 can be disposed within the housing 12 of one of the circuit breaker poles or within the outer shell 11 outside the housing 12.

[0037] like Figure 3 As shown, the improvement of this application is that it also includes at least one linkage member 93. The two ends of the linkage member 93 are respectively linked to the lever and the moving contact assembly 31. When driving the operating mechanism 2, the linkage member 93 moves along the plane parallel to the mounting sidewall 121 on the outer surface of the mounting sidewall 121.

[0038] Thus, by using the lever of the operating mechanism 2 to drive the rotary double-break contact system, the structure of the operating mechanism 2 is simplified. At the same time, each circuit breaker pole has a housing 12, and the linkage 93 between the lever and the moving contact assembly 31 is set outside the housing 12, which facilitates the formation of a modular structure for assembly. Meanwhile, the range of motion of the linkage 93 is located on the outer surface of the housing 12, which can save the internal space of each housing 12 and help to reduce the overall volume.

[0039] Furthermore, such as Figure 4 As shown, at least one mounting sidewall 121 of the housing 12 has a track groove 124 on its outer surface. The linkage 93 is located in the track groove 124. The track groove 124 restricts the movement trajectory of the linkage 93, thereby ensuring the coordination stability of the lever, the moving contact assembly 31 and the linkage 93.

[0040] Specifically, a pair of terminals 7 for each circuit breaker pole are respectively disposed at opposite ends of the housing 12, and one end of each housing 12 is provided with an operating hole and a wiring port that mate with the terminals 7. The operating hole and the wiring port are disposed on two adjacent side walls of the housing 12; for example Figure 4As shown, a first mating hole 1211 and a second mating hole 1212 are provided on the mounting side wall 121 of the housing 12. A first linkage rod 91 is linked between the moving contact assemblies 31 of two adjacent circuit breaker poles. The first linkage rod 91 can pass through the first mating hole 1211 and connect to one end of the linkage member 93. A second linkage rod 92 is connected to the lever. The second linkage rod 92 passes through the second mating hole 1212 and connects to the other end of the linkage member 93, thereby linking the operating mechanism 2, the contact system and the linkage member 93 together.

[0041] In addition, the number of operating mechanisms 2 can be one. In this case, the operating mechanism 2 can be set in the housing 12 of one of the circuit breaker poles, or the operating mechanism 2 can be located in the outer shell outside all the housings 12. Of course, the number of operating mechanisms 2 can also be two or more. Preferably, each housing 12 of the circuit breaker pole is equipped with one operating mechanism 2, and the operating mechanisms 2 of two adjacent circuit breaker poles are linked together to improve the consistency of operation. Preferably, the side wall of the housing 12 connected between the two operating holes protrudes outward to form a mounting part. Each mounting part is provided with an operating mechanism 2. Each housing 12 provides assembly space for the operating mechanism 2, which is conducive to forming a modular structure and convenient assembly.

[0042] Furthermore, each circuit breaker pole also includes a protection mechanism. The protection mechanism is connected to the main line of each circuit breaker pole to trigger the tripping of the operating mechanism 2. The protection mechanism is preferably located in the housing 12 between an operating hole and the mounting part 122. Typically, the protection mechanism includes a short-circuit protection mechanism 5 and / or an overload protection mechanism 6. The short-circuit protection mechanism 5 and the overload protection mechanism 6 are arranged side by side, making full use of the space inside the housing 12 and reducing the overall width of the circuit breaker. When a short-circuit fault occurs in the main line, the short-circuit protection mechanism 5 triggers the tripping of the operating mechanism 2. When an overload fault occurs in the main line, the overload protection mechanism 6 triggers the tripping of the operating mechanism 2.

[0043] Combination Figure 1-8 A specific embodiment of a circuit breaker is provided.

[0044] like Figure 1As shown, the circuit breaker includes a housing 11, within which an operating mechanism 2 and at least two circuit breaker poles 10 are disposed. The opposite ends of the housing 11 serve as terminals 111. Each terminal 111 is provided with an operating hole 113 and a connection port 115. The operating hole 113 and the connection port 115 are disposed on two adjacent side walls of the housing 11. The central axis of the connection port 115 is perpendicular to the central axis of the operating hole 113. The side wall of the housing 11 connecting the two terminals 111 protrudes outward to form an operating end 112. The operating end 112 is provided with a handle hole, the central axis of which is parallel to the operating hole 113. Preferably, the side wall of the housing 11 between the operating end 112 and one terminal 111 is provided with an adjustment hole 114. That is, the adjustment hole 114 is located between an operating hole 113 and the operating end 111, and the central axis of the adjustment hole 114 is parallel to the operating hole 113 and the handle hole.

[0045] In this embodiment, two circuit breaker poles 10 are taken as an example. Each circuit breaker pole 10 includes a housing 12. The housing 12 includes a pair of mounting sidewalls 121 and a housing 12 sidewall connected between the edges of the pair of mounting sidewalls 121. Each housing 12 has an operation hole 113 and a wiring port 115 at both ends. The housing 12 sidewall connected between the two operation holes 113 protrudes outward to form a mounting part 122. The mounting part 122 has a handle hole. In this embodiment, the outer shell 11 is assembled from two housings 12. Correspondingly, each wiring terminal 111 is assembled from the same end of the two housings 12. The operation terminal 112 is assembled from the mounting parts 122 of the two housings 12.

[0046] like Figure 1 , 2 As shown in Figures 5-8, each circuit breaker pole 10 includes a pair of terminals 7. Each terminal 7 is disposed at one end within the housing 12 and corresponds to the operating hole 113 and the wiring port 115. That is, the terminal 7 typically includes a wiring frame and a wiring screw. The wiring frame is opposite to the adjacent wiring port 115 for connection with an external conductor. One end of the wiring screw is rotatably disposed on the wiring frame, and the other end corresponds to an operating hole 113 of the terminal 111. The wiring screw is operated by rotating through the operating hole 113, thereby enabling the wiring screw to engage with the wiring frame and connect with an external conductor.

[0047] like Figure 4As shown, at least one mounting sidewall 121 of the housing 12 has a first mating hole 1211 and a second mating hole 1212. In the figure, both the first mating hole 1211 and the second mating hole 1212 are arc-shaped holes, and the length of the second mating hole 1212 is greater than the length of the first mating hole 1211. Furthermore, at least one mounting sidewall 121 of the housing 12 has a track groove 124 on its outer surface. The track groove 124 does not penetrate the mounting sidewall 121, that is, the depth of the track groove 124 is less than the thickness of the mounting sidewall 121. The track groove 124 connects the first mating hole 1211 and the second mating hole 1212 together along the outer surface of the mounting sidewall 121. In the figure, the track groove 124 is an inclined strip groove. One end of the second mating hole 1212 extends from one edge of the track groove 124 along an arc to extend beyond the track groove 124.

[0048] In this embodiment, the operating mechanism 2 is correspondingly disposed in the mounting portion 122 of each housing 12, such as... Figure 5 As shown, an operating mechanism 2, a contact system, and an arc-extinguishing system 4 are provided within the housing 12 between a pair of terminals 7. The operating mechanism 2 is provided with a second linkage rod 92, which can pass through the second mating hole 1212 of the housing 12 and exit the mounting side wall 121, so that the operating mechanisms 2 of two adjacent circuit breaker poles 10 are linked together through the second linkage rod 92. The contact system includes a moving contact assembly 31 and two stationary contacts. The two stationary contacts are arranged in a rotationally symmetrical manner on opposite sides of the moving contact assembly 31. Each stationary contact is electrically connected to an adjacent terminal 7. The head assembly 31 is rotatably mounted between the two mounting sidewalls 121 of the housing 12. The moving contact assembly 31 is driven to connect with the operating mechanism 2 and simultaneously contacts or opens with the two stationary contacts, thereby connecting or disconnecting the main line of each circuit breaker pole 10. Adjacent moving contact assemblies 31 are linked together. Typically, adjacent moving contact assemblies 31 are linked together through the first linkage rod 91. That is, the first linkage rod 91 passes through the first mating hole 1211 to link the moving contact assemblies 31 of the two circuit breaker poles 10 together, so as to realize the synchronous opening and closing of all circuit breaker poles 10.

[0049] In the same circuit breaker pole 10, the operating mechanism 2 and the moving contact assembly 31 are linked together via the linkage 93, such as Figure 3 As shown, the linkage 93 is a strip-shaped plate structure. The linkage 93 is fitted into the track groove 124 and slides within the track groove 124. Both ends of the linkage 93 are provided with through holes. One through hole allows the first linkage rod 91 to pass through, and the other through hole allows the second linkage rod 92 to pass through. In this embodiment, the linkage 93 is located outside the housing 12. Preferably, two adjacent circuit breaker poles 10 can share one linkage 93. Of course, each of the two circuit breaker poles 10 can also have a linkage 93.

[0050] In this embodiment, as Figure 3-6 As shown, the operating mechanism 2 includes a lever rotatably mounted on the mounting side wall 121. The lever has a second linkage hole, and a second linkage rod 92 is provided in the second linkage hole. As the lever rotates, the second linkage rod 92 moves in the area of ​​the second linkage hole located in the track groove 124. A jump buckle and a lock buckle are rotatably mounted on the lever. One end of the jump buckle and the lock buckle are engaged, and the other end of the lock buckle is provided with an unlocking part 234. The unlocking part 234 corresponds to the drive hole located on the mounting side wall 121. In this embodiment, the part of the second mating hole 1212 located outside the track groove 124 serves as the drive hole, and the unlocking part 234 moves within the drive hole. Of course, as another embodiment, when the two circuit breaker poles 10 are provided with the operating mechanism 2 in only one mounting part 122, the unlocking part 234 can be provided through the drive hole located outside the track groove 124 through the second mating hole 1212 and be provided in the mounting part 122 of the two circuit breaker poles 10.

[0051] Preferably, the operating mechanism 2 is also linked to a handle mechanism 8. The handle mechanism 8 and the operating mechanism 2 are assembled together in the same mounting part 122. The handle mechanism 8 and the operating mechanism 2 are rotatably mounted side by side in the mounting part 122. The handle mechanism 8 can adopt existing technology. The handle mechanism 8 is linked to the lever through a U-shaped connecting rod. The handle part of the handle mechanism 8 extends from the handle hole to the outside of the housing 12 for manually operating the opening and closing of the circuit breaker pole 10. The handle parts of two adjacent circuit breaker poles 10 are linked outside the housing 12 or form an integral structure to achieve synchronous drive.

[0052] The contact system includes a moving contact assembly 31 and two stationary contacts. The moving contact assembly 31 is rotatably mounted between the two stationary contacts; that is, the two stationary contacts are distributed on opposite sides of the moving contact assembly 31 in a rotationally symmetrical structure. The structure of the moving contact assembly 31 and the stationary contacts can adopt existing technologies, such as... Figure 5 As shown, the moving contact assembly 31 includes a rotating shaft 312 and a moving contact bridge 311. The circular end face of the rotating shaft 312 serves as a mounting surface. The rotating shaft 312 is rotatably mounted on the mounting side wall 121 of the housing 12 via the mounting surface. A contact cavity is provided in the middle of the rotating shaft 312. The contact cavity is radially through the rotating shaft 312. The moving contact bridge 311 is disposed through the contact cavity, so that the two ends of the moving contact bridge 311 serve as two moving contact parts. Each moving contact part is provided with a moving contact point, so that the two moving contact parts extend outside the rotating shaft 312 and respectively cooperate with two stationary contacts. A first linkage hole is provided at a position off-center from the axis of the mounting surface of the rotating shaft 312. A first linkage rod 91 is disposed in the first linkage hole and passes through the first mating hole 1211 of the housing 12.

[0053] Each stationary contact includes a stationary contact plate, one end of which is provided with a stationary contact point. The end with the stationary contact point is spaced apart from a moving contact portion. The middle of the stationary contact plate is bent at least once, so that the other end of the stationary contact plate extends toward an adjacent terminal 7. For ease of description, the two stationary contacts are divided into a first stationary contact 321 and a second stationary contact 322.

[0054] like Figure 5-8 As shown, each circuit breaker pole 10 also includes an arc extinguishing system 4. The arc extinguishing system 4 can adopt existing technology. The arc extinguishing system 4 includes two arc extinguishing chambers 41 with their arc inlets facing each other. The exhaust end of each arc extinguishing chamber 41 faces an adjacent terminal 7. Each arc extinguishing chamber 41 is located between the contact system and a terminal 7. In the figure, the first stationary contact 321 corresponds to the side of one arc extinguishing chamber 41 closer to the operating mechanism 2. The stationary contact plate of the first stationary contact 321 extends along the outer side of the adjacent arc extinguishing chamber 41 near the operating mechanism 2 for connection with an adjacent terminal 7. The second stationary contact 322 corresponds to the outer side of another arc extinguishing chamber 41 away from the operating mechanism 2 for connection with another terminal 7. The two moving contact parts of the moving contact bridge 311 correspond to the arc inlets of the two arc extinguishing chambers 41 respectively. Multiple arc extinguishing grids are provided in the arc extinguishing chamber 41 between the arc inlet and the exhaust end. The multiple arc extinguishing grids are arranged at intervals along the second direction.

[0055] In addition, the exhaust end of each arc-extinguishing system 4 corresponds to the air outlet 117 opened on the housing 11. In this embodiment, the air outlet 117 is provided at the terminal 111, and the air outlet 117 and the terminal 115 are located on the same side wall of the housing 11. An exhaust channel 42 is provided between the exhaust end of each arc-extinguishing chamber 41 and the terminal 115. The exhaust gas discharged from the arc-extinguishing chamber 41 is buffered and cooled by the exhaust channel 42 to prevent the high-temperature exhaust gas from being directly discharged from the circuit breaker.

[0056] Furthermore, the arc extinguishing system 4 also includes an arc-initiating structure, which is located at the arc inlet and cooperates with the contact system. In this embodiment, the arc-initiating structure includes a moving arc-initiating part and a stationary arc-initiating plate 43. The moving arc-initiating part is preferably disposed on the moving contact assembly 31, and the stationary arc-initiating plate 43 cooperates with the stationary contact. That is, one end of the stationary arc-initiating plate 43 is connected to the stationary contact plate with the stationary contact point, and the other end extends into the arc extinguishing chamber 41. Of course, in this embodiment, the arc extinguishing system 4 can also adopt existing technology.

[0057] In this embodiment, each circuit breaker pole 10 further includes a protection mechanism, which is disposed within the housing 12 between the operating hole and the mounting portion 122. Preferably, as shown in the example... Figure 5-7As shown, the protection mechanism is laterally arranged within the housing 12 between the operating hole 113 and the mounting portion 122, and extends towards the operating mechanism 2. This structure allows the protection mechanism to be arranged laterally within the housing 12, which helps to reduce the width of each circuit breaker pole. Of course, the protection mechanism can also be arranged as follows: Figure 8 As shown, it is arranged vertically inside the housing 12, similar to the arrangement in existing circuit breakers.

[0058] like Figure 5 , 8 As shown, the protection mechanism includes a short-circuit protection mechanism 5 and an overload protection mechanism 6 that cooperate with the operating mechanism 2 respectively. When a short-circuit fault occurs, the short-circuit protection mechanism 5 triggers the unlocking part 234 of the operating mechanism 2 to trip the operating mechanism 2. When an overload fault occurs, the overload protection mechanism 6 triggers the unlocking part 234 of the operating mechanism 2 to trip the operating mechanism 2. Figure 5 , 8 In the middle, the short circuit protection mechanism 5 and the overload protection mechanism 6 are arranged side by side and correspond to the same side of the operating mechanism 2 in the same housing 12, which is convenient for assembly and also helps to reduce the overall width.

[0059] Of course, in this embodiment, if applications such as grounding systems are not considered, the protection mechanism in each circuit breaker pole 10 can be simplified. That is, one circuit breaker pole 10 serves as a short-circuit protection pole, and only a short-circuit protection mechanism 5 is configured in the protection mechanism of the short-circuit protection pole (see [reference]). Figure 6 Another circuit breaker pole 10 serves as an overload protection pole, and only an overload protection mechanism 6 is configured in the protection mechanism of the overload protection pole (see [reference]). Figure 7 In this way, by dividing the two circuit breaker poles 10 into short-circuit protection poles and overload protection poles, too many protection mechanisms are avoided in the same circuit breaker pole 10. At the same time, the short-circuit protection mechanism 5 and the overload protection mechanism 6 are arranged side by side on the same side of the operating mechanism 2, avoiding the short-circuit protection mechanism 5 and the overload protection mechanism 6 being arranged on opposite sides of the operating mechanism 2, which helps to reduce the width of each circuit breaker pole 10.

[0060] In this embodiment, the short-circuit protection mechanism 5 can adopt existing technology. For example, the short-circuit protection mechanism 5 can be a solenoid-type electromagnetic trip unit or a snap-action trip unit that uses a magnetic yoke and an armature. The overload protection mechanism 6 also adopts existing technology. That is, the overload protection mechanism 6 includes a bimetallic component and an adjusting screw. One end of the bimetallic component is opposite to the unlocking part 234 of the operating mechanism 2, and the other end is disposed in the housing 12 and connected to the adjusting screw. The adjusting screw corresponds to the adjusting hole 114 disposed on the housing 12. By operating the adjusting screw, the distance between the bimetallic component and the operating mechanism 2 can be adjusted, thereby realizing the setting of the current value.

[0061] Preferably, an adjustment hole 114 is provided on the side wall of the housing 12 between one operating hole 113 and the mounting part 122 of each circuit breaker pole. Alternatively, an adjustment hole 114 is provided only on the side wall of the housing 12 between the mounting part 122 and the operating hole 113 in the overload protection pole. The adjustment hole 114 and the operating hole 113 are located on the same side wall of the housing 12, and the central axis of the adjustment hole 114 and the operating hole 113 are parallel. In this way, the position of the bimetallic component and the operating wiring screw can be adjusted from the same side of the housing 12 (outer shell 11), which is convenient for operation.

[0062] It should be noted that in the description of this utility model, the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used during use. They are only for ease of description and do not indicate that the device or component referred to must have a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating relative importance.

[0063] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the protection scope of the present invention.

Claims

1. A circuit breaker comprising at least two parallel circuit breaker poles (10), each circuit breaker pole (10) comprising a housing (12), an outer shell (11) being assembled from the housings (12) of all circuit breaker poles (10), each housing (12) being provided with an operating mechanism (2) and a contact system, the operating mechanism (2) comprising a lever, the contact system comprising a cooperating moving contact assembly (31) and two stationary contacts, the lever and the moving contact assembly (31) being rotatably mounted between a pair of mounting sidewalls (121) of the housing (12), characterized in that: It also includes at least one linkage (93), the two ends of which are respectively linked to the lever and the moving contact assembly (31). When driving the operating mechanism (2), the linkage (93) moves along a plane parallel to the mounting sidewall (121) on the outer surface of the mounting sidewall (121).

2. The circuit breaker according to claim 1, characterized in that: A first linkage rod (91) is linked between two adjacent moving contact assemblies (31), and the lever is connected to a second linkage rod (92). The mounting sidewall (121) of the housing (12) is provided with a first mating hole (1211) and a second mating hole (1212). The first linkage rod (91) and the second linkage rod (92) pass through the first mating hole (1211) and the second mating hole (1212) respectively and are connected to the two ends of the linkage member (93).

3. The circuit breaker according to claim 2, characterized in that: The moving contact assembly (31) includes a rotating shaft (312), the mounting surface of the rotating shaft (312) is rotatably mounted on the mounting sidewall (121), the mounting surface of the rotating shaft (312) is provided with a first linkage hole at a position off the axis, and the first linkage rod (91) is mounted in the first linkage hole.

4. The circuit breaker according to claim 2, characterized in that: The lever is provided with a second linkage hole for assembling the second linkage rod (92). A jump buckle and a lock buckle are rotatably mounted on the lever. One end of the jump buckle and the lock buckle are fastened together. The other end of the lock buckle is provided with an unlocking part (234). The unlocking part (234) swings in a drive hole opened on the mounting side wall.

5. The circuit breaker according to any one of claims 1-4, characterized in that: At least one mounting sidewall (121) of the housing (12) has a track groove (124) on its outer surface, and the linkage (93) is located in the track groove (124), which restricts the movement trajectory of the linkage (93).

6. The circuit breaker according to claim 5, characterized in that: The groove depth of the track groove (124) is less than the thickness of the mounting sidewall (121).

7. The circuit breaker according to claim 5, characterized in that: Each housing (12) has an operating hole (113) at both ends. The side wall of the housing (12) connected between the two operating holes (113) protrudes outward to form a mounting part (122). An operating mechanism (2) is provided in the mounting part (122) of at least one housing (12).

8. The circuit breaker according to claim 7, characterized in that: Each housing (12) is also provided with a protection mechanism, which includes a short circuit protection mechanism (5) and / or an overload protection mechanism (6). The short circuit protection mechanism (5) and the overload protection mechanism (6) are arranged side by side and cooperate with the unlocking part (234) to trigger the operation mechanism (2) to trip.

9. The circuit breaker according to claim 8, characterized in that: The protective mechanism is laterally disposed in the housing (12) between the operating hole (113) and the mounting portion (122), and the protective mechanism extends toward the operating mechanism (2). The short-circuit protection mechanism (5) and the overload protection mechanism (6) are housed in the same housing (12). Alternatively, the protection mechanism in one housing (12) may include only the short-circuit protection mechanism (5), and the protection mechanism in another housing may include only the overload protection mechanism (6).

10. The circuit breaker according to claim 9, characterized in that: An adjustment hole (114) is provided on the side wall of the housing (12) between at least one of the operating holes (113) and the mounting part (122), and the adjustment hole (114) corresponds to the adjustment screw of the overload protection mechanism (6).

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