Circuit breaker

Abstract

A circuit breaker comprises a shell, an operating mechanism and a circuit breaker pole, the circuit breaker pole comprises a contact system, an arc extinguishing system and a protection mechanism, the arc extinguishing system comprises two arc extinguishing chambers, the contact system is located between the two arc extinguishing chambers in a first direction, and the operating mechanism and the contact system are arranged in a second direction. The protection mechanism is matched with the operating system to trigger tripping of the operating mechanism, the protection mechanism comprises a short-circuit protection mechanism and an overload protection mechanism, the short-circuit protection mechanism and the overload protection mechanism are arranged side by side, and in the second direction, the short-circuit protection mechanism is located between one arc extinguish chamber and the operating mechanism; and the overload protection mechanism is positioned between the other arc extinguish chamber and the operating mechanism. In the invention, the short-circuit protection mechanism is arranged between the operating mechanism and one arc extinguish chamber, and the overload protection mechanism is arranged between the operating mechanism and the other arc extinguish chamber, so that not only is the cooperation among the short-circuit protection mechanism, the overload protection mechanism and the operating mechanism ensured, but also the overall width is reduced.

Description

Technical Field

[0001] This invention relates to the field of low-voltage electrical appliances, and more 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 and thus ensure the safe operation of load circuits. In existing circuit breakers, limited internal structure restricts their breaking capacity, especially in DC circuit breakers. Because their contact system employs a double-break structure, the arc-extinguishing system cooperating with the contact system includes two arc-extinguishing chambers. When a protection mechanism is required internally, it is typically located between the arc-extinguishing chamber and the terminal block, which to some extent increases the overall width of the circuit breaker. Summary of the Invention

[0003] The purpose of this invention is to overcome at least one defect of the prior art and provide a circuit breaker.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] This invention provides a circuit breaker, including a housing. An operating mechanism and at least one circuit breaker pole are disposed within the housing. Each circuit breaker pole includes a contact system, an arc-extinguishing system, and a protection mechanism. The arc-extinguishing system includes two arc-extinguishing chambers. The contact system is located between the two arc-extinguishing chambers in a first direction. The operating mechanism and the contact system are arranged along a second direction. The protection mechanism cooperates with the operating system to trigger the operating mechanism to trip. The protection mechanism includes a short-circuit protection mechanism and an overload protection mechanism.

[0006] The short-circuit protection mechanism and the overload protection mechanism are arranged side by side. In the first direction, the short-circuit protection mechanism and the overload protection mechanism are respectively arranged on opposite sides of the operating mechanism. In the second direction, the short-circuit protection mechanism is located between one arc-extinguishing chamber and the operating mechanism, and the overload protection mechanism is located between another arc-extinguishing chamber and the operating mechanism.

[0007] Preferably, the contact system includes a moving contact assembly and two stationary contacts. The moving contact assembly is driven by an operating mechanism to move linearly along a second direction. The two stationary contacts are spaced apart in a first direction, and each stationary contact is located between the arc-extinguishing system and the operating mechanism in the second direction.

[0008] In the second direction, the short-circuit protection mechanism, a stationary contact, and an arc-extinguishing chamber are arranged in sequence, and the overload protection mechanism, another stationary contact, and another arc-extinguishing chamber are arranged in sequence.

[0009] Preferably, the armature of the short-circuit protection mechanism extends toward the operating mechanism at an angle to the first direction, and the overload protection mechanism is inclined at an angle to the first direction.

[0010] Preferably, the operating mechanism includes a lever, a jump buckle, and a locking buckle. The lever is rotatably mounted on one side of an arc-extinguishing chamber in a second direction. The jump buckle and the locking buckle are stacked and rotatably mounted on the lever in a third direction, and the jump buckle and the locking buckle are engaged. The locking buckle is provided with an unlocking part. The unlocking part is triggered by a protection mechanism to drive the locking buckle to rotate, thereby releasing the locking buckle from the jump buckle engagement. A connecting rod is connected to the lever. The connecting rod is linked between the lever and the moving contact assembly of the contact system. The third direction is perpendicular to the first direction and the second direction, respectively.

[0011] Preferably, the latch has a buckle portion and a cantilever on both sides of the rotation axis, and the end of the cantilever has an unlocking portion protruding in the third direction. At least a portion of the short circuit protection mechanism and the overload protection mechanism are stacked on the cantilever in the third direction to trigger the unlocking portion.

[0012] Preferably, the short-circuit protection mechanism includes a magnetic yoke, an armature, and a conductive plate. The armature is spaced apart from the magnetic yoke, and the tail end of the armature extends toward the operating mechanism. The conductive plate passes through the gap between the magnetic yoke and the armature, and extends along the side of the arc-extinguishing chamber near the operating mechanism and is connected to an adjacent stationary contact.

[0013] Preferably, the overload protection mechanism includes a bimetallic component and an adjusting screw. The bimetallic component is located in the second direction between the operating mechanism and an arc-extinguishing chamber. The adjusting screw is located on the side of the bimetallic component facing away from the arc-extinguishing chamber. One end of the adjusting screw is connected to the bimetallic component, and the other end extends out from an adjusting hole opened in the side wall of the housing.

[0014] Preferably, the two ends of the outer casing serve as wiring terminals, and the outer casing protrudes outward between the two wiring terminals to form an operating end. The interior of the operating end is used to set an operating mechanism. An adjustment hole is provided on the side wall of the outer casing connecting the operating end and one wiring terminal, and the central axis of the adjustment hole is parallel to the second direction.

[0015] Preferably, the operating end is further provided with a handle mechanism, which is linked to the operating mechanism and extends out of the outer shell from the handle hole opened in the operating end.

[0016] Preferably, it further includes at least one pair of terminals, each pair of terminals being spaced apart and correspondingly disposed within the terminals in a first direction, the arc extinguishing system, the contact system, and the operating mechanism being located between a pair of terminals, the stationary contact and the protection mechanism being connected to an adjacent terminal respectively, each terminal being provided with an operating hole, and the central axis of the operating hole being parallel to the second direction.

[0017] Preferably, the arc extinguishing system further includes an exhaust channel. In a first direction, the two ends of the exhaust channel are connected to the exhaust end of the arc extinguishing chamber and the air outlet opened on the outer casing. In a second direction, the exhaust channel and the operating hole are located on opposite sides of the wiring terminal.

[0018] Preferably, at least one circuit breaker pole is provided inside the housing, each circuit breaker pole includes a housing, and each housing is provided with an operating mechanism, a contact system, an arc extinguishing system and a protection mechanism, and the operating mechanisms and contact systems of two adjacent circuit breaker poles are linked together.

[0019] The circuit breaker of the present invention has a short-circuit protection mechanism and an overload protection mechanism arranged side by side. The short-circuit protection mechanism is located between the operating mechanism and one arc-extinguishing chamber, and the overload protection mechanism is located between the operating mechanism and another arc-extinguishing chamber. This not only ensures the coordination between the short-circuit protection mechanism, the overload protection mechanism and the operating mechanism, but also reduces the overall width.

[0020] In addition, the armature of the short-circuit protection mechanism extends at an angle to the first direction, and the overload protection mechanism is inclined at an angle to the first direction. This ensures the coordination between the protection mechanism and the operating mechanism, without taking up too much space between the operating mechanism and the stationary contact. It makes full use of the gap between the stationary contact and the operating mechanism and improves the utilization rate of the internal space.

[0021] In addition, the latching buckle and locking buckle are stacked on the lever, and the locking buckle cantilever is stacked with the short circuit protection mechanism and the overload protection mechanism, which helps to further reduce the overall width.

[0022] In addition, the moving contact assembly in the contact system moves linearly along the second direction, and the moving range of the operating mechanism and the moving contact assembly is small, which helps to reduce the overall size.

[0023] In addition, the operating end formed by the housing is used to assemble the operating mechanism and the handle mechanism, which helps to provide a larger assembly space for the protection mechanism, the contact system and the arc extinguishing system.

[0024] In addition, the exhaust channel in the arc extinguishing system is connected to the outside from the terminal block away from the operating hole, making full use of the internal space and avoiding the impact of exhaust gas on other components.

[0025] In addition, when there are two or more circuit breaker poles inside the casing, each circuit breaker pole forms a modular structure through the casing, which facilitates the assembly of circuit breaker poles. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the circuit breaker of the present invention (single pole);

[0027] Figure 2 This is a schematic diagram of the circuit breaker structure of the present invention. Figure 1 (Two circuit breaker poles);

[0028] Figure 3 This is a schematic diagram of the circuit breaker structure of the present invention. Figure 2 (Two circuit breaker poles);

[0029] Figure 4 This is a schematic diagram of the internal structure of the circuit breaker pole of the present invention. Figure 1 ;

[0030] Figure 5 This is a schematic diagram of the internal structure of the circuit breaker pole of the present invention. Figure 2 ;

[0031] Figure 6 This is a schematic diagram of the internal structure of the circuit breaker pole of the present invention. Figure 1 (Remove the casing);

[0032] Figure 7 This is a schematic diagram of the internal structure of the circuit breaker pole of the present invention. Figure 2 (Remove the casing)

[0033] Figure 8 This is a schematic diagram showing the cooperation between the operating mechanism, the protection mechanism, and the stationary contact in this invention;

[0034] Figure 9 yes Figure 8 The main view;

[0035] Figure 10 This is a schematic diagram showing the coordination of the operating mechanism, protection mechanism, and contact system during closing in this invention;

[0036] Figure 11 yes Figure 10 The main view;

[0037] Figure 12 This is a schematic diagram showing the coordination of the operating mechanism, protection mechanism, and contact system during circuit breaker tripping in this invention;

[0038] Figure 13 yes Figure 12 Enlarged view of the A-section structure;

[0039] Figure 14 yes Figure 12 The main view;

[0040] Figure 15 This is a schematic diagram of the structure of the operating mechanism and the moving contact assembly in this invention;

[0041] Figure 16 yes Figure 15 The main view;

[0042] Figure 17 yes Figure 15 Rear view;

[0043] Figure 18 This is a schematic diagram of the latch structure in this invention;

[0044] Figure 19 This is a cross-sectional view of the arc extinguishing system in this invention;

[0045] Figure 20 This is a schematic diagram of the short-circuit protection mechanism and the stationary contact in this invention;

[0046] Figure 21 yes Figure 20 The main view;

[0047] Figure 22 This is a schematic diagram of the support structure in this invention;

[0048] Figure 23 This is a schematic diagram of the armature structure in this invention;

[0049] Figure label:

[0050] 10-Circuit breaker pole, 11-Housing, 111-Terminal, 112-Operating terminal, 113-Operating hole, 114-Adjusting hole, 115-Wiring port, 117-Air outlet, 12-Housing, 2-Operating mechanism, 21-Lever, 22-Clutch, 23-Lock, 230-Circular plate, 231-Snap fastener, 232-Cantilever, 233-Connecting plate, 234-Unlocking part, 2341-First unlocking part, 2342-Second unlocking part, 235-First limiting part, 236-Mounting boss, 24-Linkage rod, 25-Reset torsion spring, 31-Moving contact assembly, 310-Contact support, 311-Moving contact bridge, 32-Stationary contact, 320-Stationary contact plate 321-First stationary contact, 322-Second stationary contact, 4-Arc extinguishing system, 41-Arc extinguishing chamber, 42-Exhaust channel, 421-Blocking part, 43-Stationary arc-inducing plate, 44-Permanent magnet, 45-Magnetic guide plate, 46-Arc extinguishing grid, 48-Gas generating component, 5-Short circuit protection mechanism, 50-Bracket, 501-Limiting arm, 502-Connecting wall, 503-Accommodation space, 51-Magnetic yoke, 52-Armature, 520-Attracting wall, 521-Connecting arm, 5211-Opening slot, 522-First triggering part, 53-Elastic component, 6-Overload protection mechanism, 61-Bimetallic component, 62-Adjusting screw, 7-Terminal, 70-Conductive plate, 8-Handle mechanism. Detailed Implementation

[0051] The following embodiments, in conjunction with the accompanying drawings, further illustrate specific implementations of the circuit breaker of the present invention. The circuit breaker of the present invention is not limited to the descriptions in the following embodiments.

[0052] The circuit breaker includes a housing 11, within which an operating mechanism 2 and at least one circuit breaker pole 10 are disposed. Each circuit breaker pole 10 includes a pair of terminals 7, a contact system, and an arc extinguishing system 4. The pair of terminals 7 are spaced apart at both ends of the housing 11. The contact system and the arc extinguishing system 4 are disposed between the pair of terminals 7. The contact system includes a moving contact assembly 31 and two stationary contacts 32. The moving contact assembly 31 is linked to the operating mechanism 2. The operating mechanism 2 drives the moving contact assembly 31 so that the two moving contact parts of the moving contact assembly 31 simultaneously contact or simultaneously separate from the two stationary contacts 32. The arc extinguishing system 4 cooperates with the contact system to extinguish the arc. The arc extinguishing system 4 includes two arc extinguishing chambers 41, each arc extinguishing chamber 41 being located between the contact system and a terminal 7.

[0053] For ease of description, the direction in which the length of the circuit breaker lies is taken as the first direction, the direction in which the height of the circuit breaker lies as the second direction, and the direction in which the thickness of the circuit breaker lies as the third direction. The first, second, and third directions are perpendicular to each other, corresponding to... Figure 1In this configuration, the X-axis is the first direction, the Y-axis is the second direction, and the Z-axis is the third direction. Correspondingly, a pair of terminals 7 are spaced apart in the first direction. Each arc-extinguishing chamber 41 is located between the contact system and a terminal 7 in the first direction. The operating system and the contact system are arranged along the second direction. When the number of circuit breaker poles 10 is two or more, two adjacent circuit breaker poles 10 are arranged side by side along the third direction.

[0054] Each circuit breaker pole 10 is also equipped with a protection mechanism that works in conjunction with the operating mechanism 2. The protection mechanism is connected to the main line of the circuit breaker pole 10. When a fault occurs in the main line, the operating mechanism 2 is triggered to trip. The protection mechanism typically includes a short-circuit protection mechanism 5 and an overload protection mechanism 6. When a short-circuit fault occurs in the main line, the short-circuit protection mechanism 5 triggers the operating mechanism 2 to trip. When a short-circuit fault occurs in the main line, the overload protection mechanism 6 triggers the operating mechanism 2 to trip.

[0055] The improvement of this application is that the short-circuit protection mechanism 5 and the overload protection mechanism 6 are arranged side by side, and in the first direction, the short-circuit protection mechanism 5 and the overload protection mechanism 6 are respectively arranged on opposite sides of the operating mechanism 2. In the second direction, the short-circuit protection mechanism 5 is located between one arc-extinguishing chamber 41 and the operating mechanism 2, and the overload protection mechanism 6 is located between another arc-extinguishing chamber 41 and the operating mechanism 2.

[0056] In this way, the short-circuit protection mechanism 5 and the overload protection mechanism 6 are arranged side by side, with the short-circuit protection mechanism 5 located between the operating mechanism 2 and one arc-extinguishing chamber 41, and the overload protection mechanism 6 located between the operating mechanism 2 and another arc-extinguishing chamber 41. This not only ensures the coordination between the short-circuit protection mechanism 5, the overload protection mechanism 6 and the operating mechanism 2, but also reduces the overall width.

[0057] Specifically, the contact system includes a moving contact assembly 31 and two stationary contacts 32. The moving contact assembly 31 is driven by the operating mechanism 2 to move linearly in the second direction. The two stationary contacts 32 are spaced apart in the first direction. Each stationary contact 32 is located between the arc extinguishing system 4 and the operating mechanism 2 in the second direction. In the second direction, the short-circuit protection mechanism 5, one stationary contact 32 and one arc extinguishing chamber 41 are arranged in sequence. The overload protection mechanism 6, another stationary contact 32 and another arc extinguishing chamber 41 are arranged in sequence.

[0058] Preferably, the short-circuit protection mechanism 5 is arranged along the first direction. The short-circuit protection mechanism 5 includes a magnetic yoke 51, an armature 52, a conductive plate 70, and a bracket 50. The magnetic yoke 51 and the armature 52 are spaced apart and opposite each other in the second direction. The conductive plate 70 passes through the conductor cavity between the magnetic yoke 51 and the armature 52. The first end of the armature 52 is rotatably connected to the bracket 50, and the tail end of the armature 52 extends towards the operating mechanism 2 along a direction at an angle to the first direction. The overload protection mechanism 6 is arranged along a direction at an angle to the first direction. That is, the bimetallic component 61 in the overload protection mechanism 6 is arranged along a direction at an angle to the first direction. One end of the bimetallic component 61 cooperates with the operating mechanism 2, and the other end of the bimetallic component 61 is connected to an adjusting screw 62. The distance between the bimetallic component 61 and the operating mechanism 2 can be adjusted by operating the adjusting screw 62.

[0059] The inclined extension of armature 52 and the inclined setting of overload protection mechanism 6 can ensure the cooperation between protection mechanism and operating mechanism 2, without excessively occupying the space between operating mechanism 2 and stationary contact 32. This makes full use of the gap between stationary contact 32 and operating mechanism 2 and improves the utilization rate of internal space.

[0060] Combination Figure 1-23 A specific embodiment of a circuit breaker is provided.

[0061] The circuit breaker includes a housing 11, within which an operating mechanism 2 and at least one circuit breaker pole 10 are provided. The opposite ends of the housing 11 serve as terminals 111. Each terminal 111 has an operating hole 113 and a connection port 115, wherein the central axis of the connection port 115 is parallel to a first direction, and the central axis of the operating hole 113 is parallel to a second direction. The sidewall of the housing 11 connecting the two terminals 111 protrudes outward to form an operating end 112; that is, the sidewall of the housing 11 connecting the two terminals 111 extends outward along the second direction. An operating end 112 protrudes outward and is provided with a handle hole. The central axis of the handle hole is parallel to the second direction. Preferably, the side wall of the housing 11 between the operating end 112 and a terminal 111 is provided with an adjustment hole 114. The central axis of the adjustment hole 114 is parallel to the second direction. It should be noted that when there are two or more operating holes 113 on the same terminal 111, two adjacent operating holes 113 are arranged side by side in the third direction. Correspondingly, when there are two or more handle holes and adjustment holes 114, they are also arranged side by side in the third direction.

[0062] In this embodiment, each circuit breaker pole 10 has the same internal structure. Preferably, each circuit breaker pole 10 includes a housing 12. When there is one circuit breaker pole 10 inside the housing 11, the housing 12 serves as the housing 11 of the circuit breaker. When there are two or more circuit breaker poles 10 inside the housing 11, two adjacent circuit breaker poles 10 are arranged side by side in the third direction. The housing 11 of the circuit breaker is formed by assembling the housings 12 of all the circuit breaker poles 10. Each housing 12 has an operation hole 113 and a wiring port 115 at the position of the corresponding terminal 111, and a mounting part is formed at the position of the corresponding operation terminal 112. The mounting part has a handle hole. When the housing 11 has an adjustment hole 114, the side wall of the housing 12 connecting the mounting part and an operation hole 113 is provided with an adjustment hole 114.

[0063] like Figure 1-7 As shown, each circuit breaker pole 10 includes a pair of terminals 7, which are spaced apart at opposite ends of the housing 12 in a first direction. Each terminal 7 corresponds to an operating hole 113 and a wiring port 115 on the housing 12. 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 mounted 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 allowing the wiring screw to engage with the wiring frame and connect with an external conductor.

[0064] The operating mechanism 2, contact system, and arc extinguishing system 4 are disposed between a pair of terminals 7. The operating mechanism 2 is disposed within the mounting section. Preferably, a handle mechanism 8 is also disposed within the mounting section. The handle mechanism 8 is linked to the operating mechanism 2 using existing technology. The contact system includes a moving contact assembly 31 and two stationary contacts 32. Figure 4-6 In the circuit breaker, two stationary contacts 32 are spaced apart in the first direction, and both stationary contacts 32 are adjacent to the operating mechanism 2. Each stationary contact 32 is electrically connected to an adjacent terminal 7. The moving contact assembly 31 is located between the two stationary contacts 32 in the first direction and is spaced apart from the two stationary contacts 32 in the second direction. The operating mechanism 2 drives the moving contact assembly 31 to move along the second direction, so that the moving contact assembly 31 and the two stationary contacts 32 simultaneously contact or disconnect, thereby connecting or disconnecting the main line of each circuit breaker pole 10. The arc extinguishing system 4 includes two arc extinguishing chambers 41. Each arc extinguishing chamber 41 is located between the contact system and a terminal 7 in the first direction. In the second direction, a moving contact portion of the moving contact assembly 31 and a stationary contact 32 are spaced apart and opposite each other at the arc inlet of an arc extinguishing chamber 41. The exhaust end of each arc extinguishing chamber 41 faces the terminal 7. It can also be understood that the contact system is located between the two arc extinguishing chambers 41 in the first direction.

[0065] When there are two or more circuit breaker poles 10, the handle mechanism 8, operating mechanism 2 and moving contact assembly 31 of two adjacent circuit breaker poles 10 can be linked together in the third direction to ensure that all circuit breaker poles 10 operate synchronously.

[0066] like Figure 4-14 As shown, each circuit breaker pole 10 is also connected to a protection mechanism on its main line. The protection mechanism includes a short-circuit protection mechanism 5 and an overload protection mechanism 6. The short-circuit protection mechanism 5 and the overload protection mechanism 6 are arranged side by side. In the first direction, the short-circuit protection mechanism 5 and the overload protection mechanism 6 are located on opposite sides of the operating mechanism 2. In the second direction, the short-circuit protection mechanism 5 is located between one arc-extinguishing chamber 41 and the operating mechanism 2, and the overload protection mechanism 6 is located between another arc-extinguishing chamber 41 and the operating mechanism 2. This ensures the coordination between the short-circuit protection mechanism 5, the overload protection mechanism 6 and the operating mechanism 2, while also reducing the overall width.

[0067] Furthermore, the short-circuit protection mechanism 5 in this embodiment is a snap-fit ​​structure. The short-circuit protection mechanism 5 includes a conductive plate 70, a magnetic yoke 51, and an armature 52. The magnetic yoke 51 and the armature 52 are spaced apart to form a conductor cavity. The conductive plate 70 passes through the conductor cavity. When the short-circuit current flows through the conductive plate 70, the armature 52 rotates towards the magnetic yoke 51, thereby driving the operating mechanism 2 to trip. Preferably, the armature 52 extends towards the operating mechanism 2 along a direction that forms an angle with the first direction. Preferably, the angle between the extension direction of the armature 52 and the first direction is in the range of 0 to 30 degrees. The overload protection mechanism 6 includes a bimetallic component 61, which is inclined at an angle to the first direction. That is, the bimetallic component 61 is inclined relative to the first direction within the range of -30° to 0°. Both the short circuit protection mechanism 5 and the overload protection mechanism 6 are inclined at an angle to the first direction. This ensures the coordination between the protection mechanism and the operating mechanism 2, and does not occupy too much space between the operating mechanism 2 and the stationary contact 32. It makes full use of the gap between the stationary contact 32 and the operating mechanism 2 and improves the utilization rate of the internal space.

[0068] Specifically, the operating mechanism 2 used in this embodiment includes a lever 21, a snap fastener 22, and a latch 23. The lever 21 is rotatably mounted on one side of an arc-extinguishing chamber 41 in a second direction. The snap fastener 22 and the latch 23 are respectively stacked and rotatably mounted on the lever 21 in a third direction. The rotation axes of the lever 21, snap fastener 22, and latch 23 are parallel to the third direction. One end of the latch 23 is engaged with the snap fastener 22, and the other end of the latch 23 is provided with a cantilever 232. That is, a snap fastener 231 and a cantilever 232 are provided on both sides of the rotation axis of the latch 23. The cantilever 232 is located at the end away from the snap fastener 22. The end of the cantilever 232 is provided with an unlocking part 234 protruding in a third direction. At least part of the short-circuit protection mechanism 5 and the overload protection mechanism 6 are included. The region is stacked on the cantilever 232 in a third-direction upward direction to trigger the unlocking part 234. In this embodiment, the unlocking part 234 is divided into a first unlocking part 2341 and a second unlocking part 2342. The first unlocking part 2341 and the second unlocking part 2342 are distributed along the third-direction, that is, the first unlocking part 2341 and the second unlocking part 2342 are distributed along a direction parallel to the rotation axis of the latch 23. The first unlocking part 2341 cooperates with the armature 52 of the short-circuit protection mechanism 5, and the second unlocking part 2342 cooperates with the bimetallic component 61 of the overload protection mechanism 6. A connecting rod 24 is also connected to the lever 21. The connecting rod 24 is linked between the lever 21 and the moving contact assembly 31, thereby driving the operating mechanism 2 to move the moving contact assembly 31 in the second direction. Figure 4-12 As shown in Figures 14-17, a U-shaped connecting rod connects the handle mechanism 8 and the lever 21. One end of the U-shaped connecting rod is connected to the handle mechanism 8, and the other end is connected to the lever 21. The handle of the handle mechanism 8 extends from the handle hole for manual operation.

[0069] In this embodiment, a portion of the armature 52 and / or a portion of the dual-metal component 61 are stacked with the cantilever 232. The armature 52 or the dual-metal component 61 drives the cantilever 232 to rotate, thereby disengaging the latch 23 from the snap-lock 22. In this way, the portion of the armature 52 and the portion of the dual-metal component 61 are stacked with the cantilever 232 of the latch 23, either individually or together. This shortens the distance between the protection mechanism and the latch 23, eliminates the need for additional components, reduces the number of components, lowers costs, and improves the stability of the engagement.

[0070] Combination Figure 15-18 A locking structure 23 is provided for use in this embodiment.

[0071] like Figure 18As shown, the latch 23 includes a circular plate 230. The plane containing the circular plate 230 is parallel to the plane enclosed by the first direction and the second direction. One side edge of the circular plate 230 protrudes radially outward to form a latch portion 231. The other side edge of the circular plate 230 extends axially along the circular plate 230 to form a connecting plate 233. That is, the connecting plate 233 is parallel to the third direction. The edge of the connecting plate 233 extends in a direction away from the circular plate 230 to form a cantilever 232, so that the cantilever 232 and the circular plate 230 are respectively on two mutually parallel planes, away from the connecting plate. The cantilever 232 of 233 is provided with a first unlocking part 2341 and a second unlocking part 2342 at its end. The first unlocking part 2341 is parallel to the plane where the cantilever 232 is located. In the figure, the first unlocking part 2341 is an arc-shaped part protruding from the edge of the end of the cantilever 232. The second unlocking part 2342 is perpendicular to the plane where the cantilever 232 is located. The second unlocking part 2342 is a convex shaft with a certain length, and the axis of the convex shaft is parallel to a third direction. The second unlocking part 2342 is spaced apart from the connecting plate 233, so that one end of the double metal component 61 can be located between the second unlocking part 2342 and the connecting plate 233.

[0072] like Figure 18 As shown, a mounting boss 236 protrudes from the middle of the circular plate 230. The mounting boss 236 is coaxial with the circular plate 230. A through hole is provided in the middle of the mounting boss 236. A shaft-like body is provided in the through hole to form the rotation shaft of the latch 23. A first limiting part 235 is provided on one side of the mounting boss 236. The first limiting part 235 and the latch part 231 are respectively located on opposite sides of the mounting boss 236. A return torsion spring 25 is connected to the mounting boss 236. One elastic arm of the return torsion spring 25 elastically abuts against the first limiting part 235, and the other elastic arm of the return torsion spring 25 elastically abuts against the lever 21 of the operating mechanism 2. For example, a second limiting part is provided on the lever 21.

[0073] like Figure 15-17 As shown, the moving contact assembly 31 includes a contact support 310 and a moving contact bridge 311. The contact support 310 is linked to the operating mechanism 2, that is, the contact support 310 is linked to the connecting rod 24. The contact support 310 has a contact cavity in the middle. The moving contact bridge 311 is disposed through the contact cavity along the first direction, so that the two ends of the moving contact bridge 311 extend out of the contact cavity as two moving contact parts. Each moving contact part has a moving contact point and is spaced apart from a stationary contact 32 in the second direction. A contact spring is also disposed in the contact cavity. The two ends of the contact spring elastically abut against the middle of the moving contact bridge 311 and the contact support 310, respectively, to provide contact pressure when the contact system is closed.

[0074] Preferably, a guide structure is provided between the contact support 310 and the housing 11 to restrict the linear movement of the moving contact assembly 31 along the second direction. The guide structure may be a slidingly inserted guide groove and a guide portion.

[0075] like Figure 3-12 As shown in Figure 14, each stationary contact 32 includes a stationary contact plate 320. One end of the stationary contact plate 320 is provided with a stationary contact point. The end with the stationary contact point is arranged along a first direction, such that the stationary contact point and the moving contact bridge 311 are spaced apart and opposite each other in a second direction. The middle part of the stationary contact plate 320 is bent at least once. Figure 4-6 In the middle, the middle part of the stationary contact plate 320 is first bent and extended along the second direction and then bent and extended along the first direction, so that the other end of the stationary contact plate 320 extends along the first direction to an adjacent terminal 7. In the second direction, the overload protection mechanism 6 is located between a stationary contact 32 and the operating mechanism 2, and the short circuit protection mechanism 5 is located on the side of another stationary contact 32 facing away from the moving contact assembly 31.

[0076] In this embodiment, the two stationary contacts 32 are a first stationary contact 321 and a second stationary contact 322, respectively. In the second direction, the second stationary contact 322 is located below the latch 23, and the first stationary contact 321 is located to the lower left of the latch 23. The end of the first stationary contact 321 furthest from the stationary contact point has a longer length in the first direction. The stationary contact plate 320 of the first stationary contact 321 extends along the end of one arc-extinguishing chamber 41 near the operating mechanism 2, and the stationary contact plate 320 of the second stationary contact 322 extends along the corresponding side of the other arc-extinguishing chamber 41 near the operating mechanism 2. Figure 4-6 In this context, it can also be understood that the stationary contact plate 320 of the first stationary contact 321 and the stationary contact plate 320 of the second stationary contact 322 move along the top surface of the two arc-extinguishing chambers 41 respectively. In the first direction, the short-circuit protection mechanism 5 is located between the first stationary contact 321 and the operating mechanism 2, and the overload protection mechanism 6 is located between the second stationary contact 322 and the operating mechanism 2.

[0077] Combination Figure 4-13Items 20-23 provide a structure for a short-circuit protection mechanism 5 applied in this embodiment. The short-circuit protection mechanism 5 includes a magnetic yoke 51, an armature 52, a conductive plate 70, and a support 50. The magnetic yoke 51 and the armature 52 are spaced apart and opposite each other, forming a conductor cavity between the magnetic yoke 51 and the armature 52. The conductive plate 70 passes through the conductor cavity and can be connected to an adjacent terminal 7 and / or an adjacent first stationary contact 321. In a second direction, the armature 52 is disposed on the side of the first stationary contact 321 facing away from the moving contact assembly 31. The leading end of the armature 52 is connected to the support 50. The bracket 50 is rotatably connected, and a portion of the armature 52 can be stacked with the cantilever 232 in a third-order upward direction, so that the tail end of the armature 52 engages with the first unlocking part 2341 in the unlocking part 234. When a short-circuit current flows through the conductive plate 70, the magnetic yoke 51 and the armature 52 engage to generate a magnetic field, which drives the tail end of the armature 52 to trigger the first unlocking part 2341, causing the latch 23 and the jumper 22 to disengage. An elastic element 53 is connected between the bracket 50 and the armature 52, and the elastic element 53 provides a reset force for the armature 52 to reset.

[0078] Preferably, the armature 52 extends at an angle toward the latch 23, such that the angle between the extension direction of the armature 52 and the line connecting the two stationary contacts 32 is between 10° and 30°. That is, the angle between the extension direction of the armature 52 and the first direction is between 0° and 30°. The slightly inclined arrangement of the armature 52 can ensure the cooperation between the armature 52 and the latch 23, and also avoid occupying too much space between the operating mechanism 2 and the stationary contact 32.

[0079] In this embodiment, the first end of the armature 52 can be rotatably connected to the bracket 50 via a pivot. Preferably, the edge of the first end of the armature 52 is inserted into the edge of the bracket 50, so that the insertion position of the armature 52 and the bracket 50 forms the rotation fulcrum of the armature 52. The magnetic field generated by the armature 52 and the magnetic yoke 51 can drive the tail end of the armature 52 to rotate towards the magnetic yoke 51. The armature 52 and the bracket 50 are inserted into each other, and the insertion position of the armature 52 and the bracket 50 forms the rotation fulcrum of the armature 52, eliminating the need for a pivot, simplifying the assembly process, and reducing costs. Preferably, the bracket 50 is also provided with at least one limiting arm 501, which extends to the side of the armature 52 facing away from the magnetic yoke 51, so that the armature 52 rotates within the interval between the magnetic yoke 51 and the limiting arm 501. The limiting arm 501 restricts the rotation range of the armature 52, thereby improving the overall reliability.

[0080] Furthermore, the magnetic yoke 51 and / or the bracket 50 can be directly fixed to the conductive plate 70, making the short-circuit protection mechanism 5 a modular structure, which is convenient for assembly into the circuit breaker. In addition, the stationary contact plate 320 of the first stationary contact 321 can pass through the conductor cavity between the magnetic yoke 51 and the armature 52 as the conductive plate 70, thereby eliminating the need for one conductive plate 70 and saving internal space.

[0081] Combination Figure 22 A bracket 50 structure applicable to this embodiment is provided. The bracket 50 includes a support plate, a limiting arm 501, and a connecting wall 502. Preferably, the support plate, the limiting arm 501, and the connecting wall 502 are integrally formed. At least one fixing hole is provided in the middle of the support plate. By setting fasteners in the fixing hole, the bracket 50 is fixed to the conductive plate 70. The limiting arm 501 and the connecting plate 233 are respectively connected to the opposite two edges of the support plate along a direction that forms an angle with the plane of the support plate. The limiting arm 501 and the connecting wall 502 are spaced apart and opposite to each other on the same side surface of the support plate. Figure 22 In this configuration, there are two limiting arms 501. Each limiting arm 501 is connected to the support plate near a corner. A space is left between the two limiting arms 501 to allow the elastic element 53 to pass, so that the edge of the support plate outside the two limiting arms 501 can be inserted with the armature 52. The end of each limiting arm 501 away from the support plate is bent and extended in a direction away from the support plate to form a limiting end. Figure 22 In the middle, the end of each limiting arm 501 connected to the support plate is transitioned by an arc, and the position where the limiting end mates with the armature 52 is also transitioned by an arc, so that each limiting arm 501 is an arc-shaped rod structure as a whole, and a connecting hole is provided in the middle of the connecting wall 502.

[0082] like Figure 20 , 21 As shown, the magnetic yoke 51 is a plate, and the width of the magnetic yoke 51 is greater than the width of the conductive plate 70, so that the two side edges of the magnetic yoke 51 extend beyond the two side edges of the conductive plate 70, thereby facilitating the formation of magnetic gaps with the spaced armatures 52; as shown Figure 20 , 21 As shown in Figure 23, the armature 52 includes a plate-shaped armature body. A pair of attractive walls 520 are formed by bending and extending from both sides of the armature body towards the same side. The attractive walls 520 and the yoke 51 are spaced apart to form a magnetic gap. The distance between the attractive walls 520 and the yoke 51 is less than the distance between the middle plate surface of the armature body and the yoke 51. The gap between the middle plate surface of the armature body and the yoke 51 serves as a conductor cavity. A first trigger portion 522 extends outward from the middle of one end of the armature body. The first trigger portion 522 serves as the tail end of the armature 52, which is then bent outward. Figure 23In the middle, the width of the first trigger part 522 gradually decreases, making the two sides of the first trigger part 522 step-shaped. The end with the smallest width in the first trigger part 522 is bent outward to trigger the operation mechanism 2 to disengage. Each suction wall 520 extends outward from the end away from the first trigger part 522 to form a connecting arm 521. The ends of the two connecting arms 521, which serve as the beginning ends of the armature 52, are provided with opening slots 5211. The opening slots 5211 are inserted into the edge position of the bracket 50, so that the armature 52 rotates around the insertion point of the armature 52 and the bracket 50. A connecting hole is provided in the middle of the plate surface of the armature body.

[0083] like Figure 20 , 21 As shown, the elastic element 53 is a spring. The two ends of the elastic element 53 are connected to the connecting hole of the armature 52 and the connecting hole of the bracket 50, respectively. The elastic element 53 is placed in the receiving space 503 between the limiting arm 501 and the connecting wall 502 of the bracket 50. The bracket 50 provides an assembly position for the elastic element 53, preventing the elastic element 53 from protruding outside the short circuit protection mechanism 5, making the overall structure of the short circuit protection mechanism 5 reasonable and compact, and helping to avoid interference from other components.

[0084] like Figure 4-14 As shown, in the second direction, the overload protection mechanism 6 is located between the second stationary contact 322 and the operating mechanism 2. The overload protection mechanism 6 includes a bimetallic component 61 and an adjusting screw 62. The bimetallic component 61 is disposed between the second stationary contact 322 and the latch 23, such that at least a portion of the bimetallic component 61 is stacked on the cantilever 232 in the third direction. Figure 4-6 In 9, 11, 13, and 14, one end of the double-metal component 61 is stacked on the cantilever 232, so that one end of the double-metal component 61 engages with the second unlocking part 2342 of the cantilever 232. The other end of the double-metal component 61 is fixed inside the housing 11 and connected to an adjacent terminal 7 via another conductive plate 70. Preferably, the double-metal component 61 is inclined, and the angle between the extension direction of the double-metal component 61 and the first direction is in the range of 10° to 30°. The slightly inclined arrangement of the double-metal component 61 can ensure the engagement between the armature 52 and the latch 23. This also avoids occupying too much space between the operating mechanism 2 and the stationary contact 32; one end of the adjusting screw 62 is connected to the other end of the bimetallic component 61, and the other end of the adjusting screw 62 is engaged with the adjusting hole 114 opened on the housing 12 (or the outer shell 11). In the figure, the adjusting screw 62 is located on the side of the bimetallic component 61 facing away from the arc-extinguishing chamber 41. One end of the adjusting screw 62 is connected to the bimetallic component 61, and the other end extends out from the adjusting hole 114. By operating the adjusting screw 62, the interval between the bimetallic component 61 and the operating mechanism 2 can be changed, thereby realizing the setting of the current value.

[0085] When an overload fault occurs, the bimetallic component 61 is heated and bent. The bimetallic component 61 triggers the unlocking part 234 of the latch 23, thereby driving the latch 23 to rotate and disengage the latch 23 from the snap-fit ​​22. The bimetallic component 61 is stacked on the cantilever 232, which improves the stability of the engagement between the bimetallic component 61 and the latch 23. The principle of the bimetallic component 61 triggering the operating mechanism 2 to release is existing technology.

[0086] In this embodiment, the adjustment hole 114 is provided on the side wall of the housing 12 (outer shell 11) connecting the terminal 111 and the mounting part (operating end 112), and the adjustment hole 114 and the operating hole 113 are located on the same side, which facilitates the adjustment of the terminal 7 and the overload protection mechanism 6 from the same side of the outer shell 11. At the same time, the setting position of the adjustment hole 114 is changed, and the distance between the adjustment hole 114 and the bimetallic component 61 is shortened, so that the adjusting screw 62 or the bimetallic component 61 no longer needs to cross or avoid the terminal 7, nor does it need to be opposite to the exhaust end of the arc-extinguishing chamber 41. This shortens the length of the bimetallic component 61 or the adjusting screw 62, saves internal space, and reduces costs.

[0087] Furthermore, to enhance the insulation performance between the armature 52 and the bimetallic component 61, an insulating element can be provided at the tail end of the armature 52 and / or one end of the bimetallic component 61, or an insulating element can be provided between the tail end of the armature 52 and / or one end of the bimetallic component 61. Alternatively, the insulating element and the insulating element can be integrally mounted on the locking element 23.

[0088] In this embodiment, the arc extinguishing system 4 includes two parallel arc extinguishing chambers 41. In a first direction, the arc inlets of the two arc extinguishing chambers 41 are spaced apart and opposite to each other. Each arc extinguishing chamber 41 is located between a terminal 7 and a moving contact assembly 31. Each stationary contact 32 is disposed on one side of the arc inlet. In a second direction, a moving contact portion of the moving contact assembly 31 is spaced apart and opposite to a stationary contact 32. Figure 4-6 In 9, 11, and 14, two stationary contacts 32 are arranged side by side in the first direction, and each stationary contact 32 is located on the side of the arc inlet closer to the operating mechanism 2, so that the operating mechanism 2 drives the moving contact assembly 31 to move linearly in the second direction. The end of each arc-extinguishing chamber 41 away from the arc inlet is the exhaust end, and the exhaust end faces an adjacent terminal 7. Multiple arc-extinguishing grids 46 are arranged in the arc-extinguishing chamber 41 located between the arc inlet and the exhaust end. The multiple arc-extinguishing grids 46 are arranged at intervals in the second direction. After the arc enters through the arc inlet, it is extinguished after being cut by the arc-extinguishing grids 46. The exhaust gas generated by the arc extinguishing is discharged from the exhaust port of the exhaust end of the arc-extinguishing chamber 41.

[0089] like Figure 4 , 7As shown, each arc-extinguishing chamber 41 is also equipped with a magnet assembly, which includes a permanent magnet 44 and a pair of magnetic guide plates 45. In the second direction, the permanent magnet 44 is stacked with the arc-extinguishing chamber 41. In the figure, the permanent magnet 44 is located on the bottom surface of the arc-extinguishing chamber 41 facing away from the operating mechanism 2, and the size of the permanent magnet 44 is the same as the bottom surface size of the arc-extinguishing chamber 41. The pair of magnetic guide plates 45 are spaced apart in the third direction. The arc-extinguishing chamber 41 and the permanent magnet 44 are located between the pair of magnetic guide plates 45. The two magnetic poles of the magnet 44 are respectively attached to a pair of magnetic plates 45. The permanent magnet 44 and the magnetic plates 45 work together to generate an arc-initiating magnetic field. The arc-initiating magnetic field can cover the arc inlet and the exhaust end of the arc-extinguishing chamber 41. That is, in the third direction, the arc inlet and the exhaust end are both located between a pair of magnetic plates 45, so that the entire process of arc generation and extinguishing is within the arc-initiating magnetic field. The arc is subjected to the Lorentz force in the arc-initiating magnetic field and quickly enters the arc-extinguishing chamber 41, thereby improving the arc-initiating and arc-extinguishing efficiency.

[0090] In this embodiment, in the two sets of magnet assemblies, the magnetic poles of the two permanent magnets 44 face opposite directions. Figure 4 In the diagram, the N pole of the permanent magnet 44 on the left faces inwards from the paper, while the N pole of the permanent magnet 44 on the right faces outwards from the paper. This creates two arc-inducing magnetic fields with opposite directions within the two arc-extinguishing chambers 41 of the arc-extinguishing system 4, allowing the circuit breaker in this embodiment to meet the requirements of non-polarity wiring. Alternatively, the orientation of the magnetic poles of the permanent magnets 44 can be changed so that the magnetic poles of the two permanent magnets 44 face the same direction. For example, the N poles of the permanent magnets 44 on both sides can be modified to face inwards from the paper, thereby creating two arc-inducing magnetic fields with the same direction within the two arc-extinguishing chambers 41 of the arc-extinguishing system 4, allowing the circuit breaker to meet the requirements of polarity wiring.

[0091] In addition, in this embodiment, the permanent magnets 44 corresponding to the two arc-extinguishing chambers 41 are arranged side by side and spaced apart in the first direction, and in the second direction, each permanent magnet 44 is stacked with the arc-extinguishing chamber 41. Figure 4 , 7 In this configuration, the permanent magnet 44 is disposed on the bottom surface of the arc-extinguishing chamber 41 facing away from the operating mechanism 2. Preferably, the side plate 47 of the permanent magnet 44 facing away from the arc-extinguishing chamber 41 is flush with the edge of the magnetic guide plate 45, thereby facilitating the maintenance of an external flatness. Furthermore, the magnetic guide plate 45 can be made of either a magnetic material or a magnetically conductive material. When the magnetic guide plate 45 is made of a magnet, it and the permanent magnet 44 can form an integrated U-shaped structure.

[0092] Furthermore, such as Figure 19As shown, each arc-extinguishing chamber 41 also includes a pair of gas-generating elements 48, which are spaced apart in the third direction. Each arc-extinguishing grid 46 is fixedly assembled between the pair of gas-generating elements 48. Two adjacent arc-extinguishing grids 46 are spaced apart and opposite each other in the second direction, forming an arc-extinguishing gap between them. Typically, one end of each arc-extinguishing grid 46 has an arc-extinguishing notch, which is opposite to the arc inlet. The other end of the arc-extinguishing grid 46 is adjacent to the exhaust end, so that the arc-extinguishing gap connects the arc inlet and the exhaust end. The arc-extinguishing notches of all the arc-extinguishing grids 46 are connected in the second direction. An arc-extinguishing groove is formed opposite to the arc inlet. Preferably, it also includes a pair of side plates 47 spaced apart in the third direction. A gas generating element 48 is disposed between the pair of side plates 47, and each gas generating element 48 is fixedly connected to the adjacent side plate 47. Each arc-extinguishing grid plate 46 can be fixedly connected to both the gas generating element 48 and the side plate 47 at the same time. That is, the gas generating element 48 wraps around the legs on both sides of the arc-extinguishing notch, so that the gas generating element 48 is located on opposite sides of the arc inlet in the third direction. The two sides of each arc-extinguishing grid plate 46 can be inserted into the side plate 47 respectively, ensuring the stable assembly of the arc-extinguishing grid plate 46.

[0093] like Figure 4 , 5 As shown, the arc extinguishing system 4 also includes an exhaust channel 42. One end of the exhaust channel 42 is connected to the exhaust end of each arc extinguishing chamber 41, and the other end of the exhaust channel 42 is connected to the air outlet 117 provided on the outer casing 11. The exhaust gas discharged from the arc extinguishing chamber 41 is buffered by the exhaust channel 42 to prevent the high-temperature exhaust gas from being discharged directly. In this embodiment, the air outlet 117 is opened at the terminal 111. The air outlet 117 and the terminal 115 are located on the same side wall of the outer casing 11, and the air outlet 117 corresponds to the position of the terminal 7 away from the operating hole 113. Thus, the exhaust channel 42 is arranged along the position of the terminal 7 away from the operating hole 113. Preferably, a plurality of blocking parts 421 are provided in the exhaust channel 42. Two adjacent blocking parts are staggered and opposite each other. The blocking parts 421 change the airflow direction, which can further buffer the exhaust gas and prevent impurities from being ejected outside the circuit breaker. It should be noted that the overload protection mechanism 6 in this embodiment avoids the exhaust end and exhaust channel 42 of the arc extinguishing chamber 41, so as to prevent the exhaust gas after arc extinguishing from interfering with the bimetallic component 61.

[0094] 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 32.

[0095] In addition, the arc extinguishing system 4 can also use existing technologies.

[0096] It should be noted that in the description of this invention, 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 conventionally placed during use. They are used only for ease of description and do not indicate that the device or element referred to must have a specific orientation, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating relative importance.

[0097] 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 scope of protection of the present invention.

Claims

1. A circuit breaker comprising a housing (11), an operating mechanism (2) and at least one circuit breaker pole (10) arranged in the housing (11), the circuit breaker pole (10) comprising a contact system, an arc extinguishing system (4) comprising two arc chambers (41), the contact system being arranged between the two arc chambers (41) in a first direction, the operating mechanism (2) being arranged in a second direction with the contact system, and a protection mechanism cooperating with the operating system for triggering a trip of the operating mechanism (2), the protection mechanism comprising a short-circuit protection mechanism (5) and an overload protection mechanism (6), the short-circuit protection mechanism (5) and the overload protection mechanism (6) being arranged side by side, and in the first direction, the short-circuit protection mechanism (5) and the overload protection mechanism (6) being arranged on opposite sides of the operating mechanism (2), respectively, and in the second direction, the short-circuit protection mechanism (5) being arranged between one of the arc chambers (41) and the operating mechanism (2), and the overload protection mechanism (6) being arranged between the other arc chamber (41) and the operating mechanism (2). characterized in that The contact system comprises a movable contact assembly (31) driven by the operating mechanism (2) for linear movement in the second direction, and two stationary contacts (32) arranged in the first direction, each stationary contact (32) being arranged in the second direction between the arc extinguishing system (4) and the operating mechanism (2).

2. The circuit breaker of claim 1, wherein: In the second direction, the short-circuit protection mechanism (5), one stationary contact (32) and one arc chamber (41) are arranged in sequence, and the overload protection mechanism (6), the other stationary contact (32) and the other arc chamber (41) are arranged in sequence. An armature (52) of the short-circuit protection mechanism (5) extends in a direction forming an angle with the first direction towards the operating mechanism (2), and the overload protection mechanism (6) is arranged in an inclined manner in a direction forming an angle with the first direction.

3. The circuit breaker of claim 1 or 2, wherein: The operating mechanism (2) comprises a lever (21), a trip (22) and a lock (23), the lever (21) being rotatably arranged in the second direction on one side of one of the arc chambers (41), the trip (22) and the lock (23) being rotatably arranged in a third direction on the lever (21) in a stacked manner, respectively, and the trip (22) and the lock (23) being snap-fitted, the lock (23) being provided with an unlocking portion (234) for driving the lock (23) to rotate by triggering the unlocking portion (234) of the protection mechanism, so that the lock (23) and the trip (22) are disengaged, and the lever (21) is connected with a connecting rod (24) which is connected in linkage between the lever (21) and the movable contact assembly (31) of the contact system, the third direction being perpendicular to the first direction and the second direction, respectively.

4. The circuit breaker of claim 1, wherein: ​ 5. The circuit breaker of claim 4, wherein: The rotation axis of the lock buckle (23) is provided with a buckle part (231) and a cantilever (232) on both sides, the end of the cantilever (232) is provided with an unlocking part (234) protruding in the third direction, and at least part of the short-circuit protection mechanism (5) and the overload protection mechanism (6) are stacked in the third direction on the cantilever (232) for triggering the unlocking part (234).

6. The circuit breaker of claim 1, wherein: The short-circuit protection mechanism (5) comprises a magnetic yoke (51), an armature (52) and a conductive plate (70), the armature (52) is spaced apart from the magnetic yoke (51), and the tail end of the armature (52) extends towards the operating mechanism (2), the conductive plate (70) passes through the space between the magnetic yoke (51) and the armature (52), and the conductive plate (70) extends along the side of the arc extinguishing chamber (41) close to the operating mechanism (2) and is connected with an adjacent static contact (32).

7. The circuit breaker of claim 1, wherein: The overload protection mechanism (6) comprises a double gold component (61) and an adjusting screw (62), the double gold component (61) is located between the operating mechanism (2) and an arc extinguishing chamber (41) in the second direction, the adjusting screw (62) is located on the side of the double gold component (61) away from the arc extinguishing chamber (41), one end of the adjusting screw (62) is connected with the double gold component (61), and the other end extends out of the adjusting hole (114) opened in the side wall of the shell (11).

8. The circuit breaker of claim 7, wherein: The two ends of the shell (11) are respectively used as wiring terminals (111), the shell (11) connected between the two wiring terminals (111) protrudes outward to form an operating end (112), the inside of the operating end (112) is used for arranging the operating mechanism (2), the side wall of the shell (11) connected between the operating end (112) and one wiring terminal (111) is provided with an adjusting hole (114), and the central axis of the adjusting hole (114) is parallel to the second direction.

9. The circuit breaker of claim 8, wherein: The inside of the operating end (112) is also provided with a handle mechanism (8), the handle mechanism (8) is connected with the operating mechanism (2) in linkage, and the handle mechanism (8) extends out of the shell (11) from the handle hole opened in the operating end (112).

10. The circuit breaker of claim 8, wherein: At least one pair of wiring terminals (7) is further included, each pair of wiring terminals (7) is spaced apart and arranged in the first direction and arranged in the wiring terminal (111), the arc extinguishing system (4), the contact system and the operating mechanism (2) are located between a pair of wiring terminals (7), the static contact (32) and the protection mechanism are respectively connected with an adjacent wiring terminal (7), each wiring terminal (111) is provided with an operating hole (113), and the central axis of the operating hole (113) is parallel to the second direction.

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