Molded case circuit breaker

Abstract

The plastic shell circuit breaker comprises a shell, an operating mechanism and at least one contact system arranged in the shell, each contact system comprising a contact mechanism, the contact mechanism comprising a rotating shaft, a movable contact module and a static contact, the movable contact module comprising a movable contact and the rotating shaft, the movable contact being drivingly connected with the rotating shaft, the rotating shaft being driven by the operating mechanism to drive the movable contact to contact or separate from the static contact, and the shell further comprising repulsion limiting structure, the repulsion limiting structure limiting the rotating angle of the movable contact after the movable contact is repulsed to rotate relative to the rotating shaft by electric force. In the present application, the repulsion limiting structure is arranged in the shell, the swing angle of the movable contact is limited by the repulsion limiting structure after the movable contact is repulsed by electric force, the movable contact is prevented from colliding with the shell, and the movable contact is prevented from being affected.

Description

Technical Field

[0001] This invention relates to the field of low-voltage electrical appliances, and more specifically to a molded case circuit breaker. Background Technology

[0002] A molded case circuit breaker (MCCB) is a device used to protect circuits. Its main function is to automatically disconnect the circuit when the current exceeds a set value to prevent equipment damage or fire hazards. An MCCB contains an operating mechanism and at least one contact system. Each contact system has a contact mechanism used to connect or disconnect one phase of the main circuit. The contact mechanism includes a shaft, a moving contact, and a stationary contact. The shaft is driven to rotate by the operating mechanism, and the moving contact is driven to connect with or separate from the stationary contact. Under normal circumstances, the operating mechanism drives the contact mechanism in each contact system to perform opening and closing operations. When a short-circuit current flows through the main circuit, the electrodynamic force generated between the moving and stationary contacts can repel the moving contact. However, in existing MCCBs, due to the lack of a corresponding repulsion limiting structure for the contact mechanism, the repelled moving contact can only be stopped from continuing to rotate by the inner side of the casing (usually the middle cover). As a result, the huge impact force can easily affect the performance of the contact mechanism. Summary of the Invention

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

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

[0005] This invention provides a molded case circuit breaker, including a housing, an operating mechanism and at least one contact system disposed within the housing, each contact system including a contact mechanism, the contact mechanism including a rotating shaft, a moving contact module and a stationary contact, the moving contact module including a moving contact and the rotating shaft, the moving contact being driven to the rotating shaft by the operating mechanism to cause the moving contact to contact or separate from the stationary contact, the housing also being provided with a repulsion limiting structure, when the moving contact is electrically repelled and rotates relative to the rotating shaft, the repulsion limiting structure limits the rotation angle of the moving contact.

[0006] Preferably, the repulsion limiting structure includes a second repulsion limiting structure, which is spaced apart from the stationary contact. When the moving contact is repelled by electrodynamic force, the side of the moving contact facing away from the stationary contact makes elastic contact with the second repulsion limiting structure.

[0007] Preferably, the housing includes a base and a middle cover that fits onto the base. The middle cover has a second repulsion limiting structure on the side facing the stationary contact. The second repulsion limiting structure has an inclined surface that elastically contacts the side of the moving contact opposite to the stationary contact.

[0008] Preferably, the second repulsion limiting structure includes an elastic element and a contact element. The side of the contact element facing the stationary contact is provided with the pressing slope, which is used to elastically abut against the moving contact. The side of the contact element facing away from the stationary contact is connected to the elastic element, and the elastic element buffers the impact between the moving contact and the contact element.

[0009] Preferably, the inner wall of the housing is provided with a receiving groove, the elastic element is connected to the side of the contact member facing away from the stationary contact, the contact member is slidably assembled in the receiving groove, and the contact member and the receiving groove are slidably engaged by a sliding rail and a sliding part that cooperate with each other.

[0010] Preferably, the inner wall of the outer casing is provided with a strip-shaped groove, and the contact member is provided with a buckle. When the moving contact is not in contact with the limiting inclined surface, the buckle cooperates with the bottom of the groove to prevent the contact member from falling off. When the moving contact is in contact with the limiting inclined surface, the buckle slides along the direction away from the bottom of the groove.

[0011] Preferably, the second repulsion limiting structure includes a spring piece, one end of which is fixed to the middle cover, and the other end of which extends obliquely within the outer shell along a direction deviating from the middle cover to form an abutting slope, the abutting slope being used to elastically abut against the moving contact.

[0012] Preferably, the spring is strip-shaped, one end of the spring extends horizontally as a fixing part and is provided with a fixing hole, the middle part of the spring is bent at least once to form a connecting part, and the other end of the spring extends obliquely in a direction away from the fixing part, with the side plate surface of the other end of the spring facing the stationary contact as an abutting slope.

[0013] Preferably, the moving contact module further includes a contact bracket, which is fixed inside the housing, and the moving contact is rotatably mounted on the contact bracket.

[0014] The repulsion limiting structure further includes a first repulsion limiting structure, which is disposed on the moving contact module. The first repulsion limiting structure includes a limiting part, which is disposed on the contact support. The limiting part abuts against the end of the moving contact away from the stationary contact, thereby limiting the rotation angle of the moving contact.

[0015] Preferably, the moving contact module further includes a baffle, which is fixed between the two connecting walls of the contact bracket, and the limiting part is disposed on the baffle.

[0016] Preferably, the inner wall of the housing facing the stationary contact is provided with a limiting slope, and one end of the moving contact away from the contact support swings between the limiting slope and the stationary contact. When the moving contact is electrically repelled and contacts the first repulsion limiting structure, a gap is left between the side of the moving contact facing away from the stationary contact and the limiting slope.

[0017] Preferably, the baffle includes a support wall, one end of which is bent and extends horizontally to form a horizontal wall for connection with the contact bracket, the other end of which is bent and extends away from the horizontal wall to form an inclined wall, and the end of the inclined wall away from the support wall extends close to the horizontal wall to form a limiting portion.

[0018] Preferably, the baffle and the contact support are an integral structure, the bottom wall edge of the contact support is bent and extended to form the support wall of the baffle, the inclined wall and the limiting part are located between the two connecting walls of the contact support, and the bottom wall of the contact support serves as the horizontal wall of the baffle.

[0019] Preferably, the baffle includes two spaced-apart support walls, one end of each support wall is bent and extends horizontally to form a horizontal wall, and the other end of each support wall extends obliquely away from the horizontal wall to form an inclined wall. The two inclined walls are joined at an angle between the two support walls, and the two horizontal walls are parallel to each other between the two support walls. One of the inclined walls serves as a limiting part, and one of the horizontal walls is used for fixed connection with the contact bracket.

[0020] Preferably, the two inclined walls are divided into a long inclined wall and a short inclined wall, with the long inclined wall serving as a limiting part, and the two horizontal walls are divided into a long horizontal wall and a short horizontal wall, with the long horizontal wall connected to the contact bracket, and the long horizontal wall and the long inclined wall being connected to the same support wall.

[0021] Preferably, each contact system further includes an arc-extinguishing chamber, wherein the moving contact and the stationary contact are disposed at opposite ends of the arc-extinguishing chamber at a distance, and the movement trajectory of the moving contact corresponds to the arc-extinguishing chamber's arc-extinguishing port.

[0022] The repulsion limiting structure further includes a third repulsion limiting structure, which is fixed to the end of the arc extinguishing chamber near the moving contact, or the third repulsion limiting structure is fixed to the inner wall of the outer shell. The third repulsion limiting structure has a buffer groove, and when the moving contact is repelled by electrodynamic force, at least a portion of the side of the moving contact facing away from the stationary contact is received in the buffer groove.

[0023] Preferably, the third repulsion limiting structure includes a reflector plate, and the reflector plate has a buffer groove on the side facing the contact mechanism. The bottom of the buffer groove has a plurality of buffer posts protruding outwards, and the protrusion height of the buffer posts is less than the groove depth of the buffer groove, and the buffer posts abut against the moving contact.

[0024] Preferably, the third repulsion limiting structure includes an arc-extinguishing cover, and the side of the arc-extinguishing cover facing the contact mechanism is provided with the buffer groove. The bottom of the buffer groove is provided with an observation window, through which the moving contact can be observed.

[0025] Preferably, the rotating shaft is rotatably assembled inside the housing, the rotating shaft has a receiving cavity, the moving contact is disposed through the receiving cavity, one end of the moving contact that cooperates with the stationary contact is located outside the receiving cavity, the end of the moving contact away from the stationary contact is rotatably assembled to the contact bracket through a connecting shaft, and the end of the moving contact away from the stationary contact and the connecting shaft are assembled inside the receiving cavity.

[0026] Preferably, the end of the moving contact away from the stationary contact is rotatably mounted between the two connecting walls of the contact bracket via a connecting shaft. The moving contact includes at least two parallel moving contact pieces, and the ends of the at least two moving contact pieces away from the stationary contact are electrically connected. A boss is provided in the middle of the connecting shaft, and two adjacent moving contact pieces are separated by the boss.

[0027] The molded case circuit breaker of the present invention, by setting a repulsion limiting structure inside the housing, restricts the swing angle of the moving contact after it is repelled by electrodynamic force, preventing the moving contact from colliding with the housing and avoiding any impact on the moving contact.

[0028] In addition, the second repulsion limiting structure is spaced opposite to the stationary contact. After the moving contact is repelled, it makes elastic contact with the second repulsion limiting structure, thereby buffering the impact of the moving contact on the housing and avoiding affecting the performance of the moving contact.

[0029] In addition, the second repulsion limiting structure is an inclined surface set on the middle cover to avoid the second repulsion limiting structure occupying too much internal space.

[0030] In particular, the inclined surface can be formed by the cooperation of sliding contact parts and elastic parts, which has the advantages of low cost and convenient replacement, or it can be formed by a single spring. Its structure is diverse and its application range is wide.

[0031] In addition, by setting the first repulsion limit structure, the impact between the moving contact and the housing can be buffered. The limit part is set on the contact support, so that the moving contact, the contact support and the limit part form a modular structure. This simplifies the assembly, allowing the moving contact module to be installed into the housing as a whole, and avoids major modifications to the contact support. In particular, it does not require changes to the structure of the existing molded case circuit breaker, which is conducive to the transformation and upgrading of existing products. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the internal structure of the molded case circuit breaker in this invention;

[0033] Figure 2 This is a schematic diagram of the molded case circuit breaker in this invention when it is closed;

[0034] Figure 3 This is a schematic diagram of the molded case circuit breaker in this invention during tripping;

[0035] Figure 4 This is a schematic diagram of the structure of the moving contact, the contact support, and the first type of baffle in the first embodiment of the present invention;

[0036] Figure 5 This is a schematic diagram of the structure of the contact support and the first type of baffle in the first embodiment of the present invention;

[0037] Figure 6 yes Figure 5 Cross-sectional view;

[0038] Figure 7 This is a schematic diagram of the structure of the contact support and the second type of baffle in the first embodiment of the present invention;

[0039] Figure 8 yes Figure 7 Exploded view of the middle contact support and the middle baffle;

[0040] Figure 9 This is a schematic diagram of the structure of the third type of baffle in the first embodiment of the present invention;

[0041] Figure 10 This is a schematic diagram of the structure of the fourth type of baffle in the first embodiment of the present invention;

[0042] Figure 11 This is a schematic diagram of the structure of the fifth type of baffle in the first embodiment of the present invention;

[0043] Figure 12 This is a schematic diagram of the cooperation between the moving contact, the contact element, and the elastic element in the second embodiment of the present invention;

[0044] Figure 13 This is a schematic diagram of the structure of the contact element, elastic element, and middle cover in the second embodiment of the present invention;

[0045] Figure 14 This is a schematic diagram of the contact element in the second embodiment of the present invention;

[0046] Figure 15 This is a schematic diagram of the cooperation structure between the moving contact and the spring sheet in the third embodiment of the present invention;

[0047] Figure 16 This is a schematic diagram of the spring sheet structure in the third embodiment of the present invention;

[0048] Figure 17 This is a schematic diagram of the cooperation between the reflector, the moving contact, and the middle cover in the fourth embodiment of the present invention;

[0049] Figure 18 This is a schematic diagram of the reflector structure in the fourth embodiment of the present invention;

[0050] Figure 19 This is a cross-sectional view of the reflector in the fourth embodiment of the present invention;

[0051] Figure 20 This is a schematic diagram of the cooperation between the moving contact and the arc-extinguishing cover in the fifth embodiment of the present invention;

[0052] Figure 21 This is a schematic diagram of the arc-extinguishing cover in the fifth embodiment of the present invention;

[0053] Figure label:

[0054] 11-Middle cover, 111-Sliding part, 112-Limiting slope, 113-Allowing space, 12-Base, 21-Moving contact, 210-Moving contact piece, 211-Moving contact point, 22-Stationary contact, 23-Contact bracket, 231-Connecting wall, 232-Bottom wall, 233-Connecting shaft, 24-Rotating shaft, 3-Baffle, 30-Limiting part, 31-Supporting wall, 32-Horizontal wall, 33-Inclined wall, 41-Elastic element, 42-Contact element, 420-Pressing slope, 421-Slide rail, 422-Snap fastener, 5-Spring piece, 51-Fixing part, 52-Connecting part, 53-Abutting slope, 54-Fixing hole, 6-Arc extinguishing chamber, 7-Reflector plate, 71-Buffer groove, 72-Buffer column, 8-Arc extinguishing cover, 81-Observation window. Detailed Implementation

[0055] The following embodiments, in conjunction with the accompanying drawings, further illustrate specific implementations of the molded case circuit breaker of the present invention. The molded case circuit breaker of the present invention is not limited to the descriptions in the following embodiments.

[0056] like Figure 1-4As shown, a molded case circuit breaker includes a housing, an operating mechanism and at least one contact unit are provided inside the housing, and an operating element is connected to the operating mechanism, extending out of the housing for manual operation of the operating mechanism; each contact unit includes a contact mechanism, which includes a rotating shaft 24, a moving contact module and a stationary contact 22, wherein the moving contact module includes a contact bracket 23 fixed inside the housing, and a moving contact 21 is provided on the contact bracket 23. The moving contact 21 is drivenly connected to the rotating shaft 24. The operating mechanism drives the rotating shaft 24 of each contact unit to rotate, so that the moving contact 21 in the same contact unit contacts or separates from the stationary contact 22. All moving contacts 21 move synchronously through the rotating shaft 24, so that all contact units are synchronously closed or opened.

[0057] Specifically, the housing typically includes a base 12 and a middle cover 11 fitted onto the base 12. An operating hole is provided in the center of the middle cover 11. An operating mechanism is rotatably mounted between the middle cover 11 and the base 12. The operating element extends from the operating hole to the outside of the housing. A contact system is mounted inside the base 12. Each contact system includes a pair of terminals located at opposite ends of the base 12. A contact mechanism and an arc-extinguishing system are provided between the pair of terminals. The stationary contact 22 is fixed inside the base 12 and electrically connected to an adjacent terminal. In the moving contact module, the moving contact 21 is connected via a contact bracket 23 (…). Figure 4 The moving contact 21 is rotatably mounted inside the base 12 and is driven by the rotating shaft 24. The rotating shaft 24 is driven by the operating mechanism to rotate around the axis between the middle cover 11 and the base 12. The rotating shaft 24 causes the moving contact 21 to contact or separate from the stationary contact 22. That is, one end of the moving contact 21 is provided with a moving contact 211, which cooperates with the stationary contact provided on the stationary contact 22. The moving contacts 21 of two adjacent contact units rotate synchronously, thereby realizing the synchronous operation of multiple contact units. During normal opening and closing, the moving contact 21 rotates synchronously with the rotating shaft 24. When the contact mechanism is in the closed state, if a short-circuit current flows through the contact system, the electric repulsion force generated between the moving contact 21 and the stationary contact 22 will push the moving contact 21 away. At this time, the moving contact 21 will rotate in the opening direction before the rotating shaft 2. The rotating shaft 24 will rotate in the opening direction after the short-circuit protection mechanism triggers the tripping of the operating mechanism, which will be later than the moving contact 21. That is, the moving contact 21 swings around the rotating shaft 24 in the opening direction. The side of the moving contact 21 facing away from the stationary contact 22 stops rotating after hitting the inner wall of the housing.

[0058] The improvement of this application is that a repulsion limiting structure is provided inside the housing. When the moving contact 21 is repelled by the electric force and rotates relative to the rotating shaft 24, the repulsion limiting structure limits the rotation angle of the moving contact 21. In this way, by providing a repulsion limiting structure inside the housing, after the moving contact is repelled by the electric force, the repulsion limiting structure limits the swing angle of the moving contact, preventing the moving contact from colliding with the housing and avoiding any impact on the moving contact.

[0059] Specifically, the repulsion limiting structure includes a first repulsion limiting structure, a second repulsion limiting structure, and a third repulsion limiting structure. The first repulsion limiting structure, the second repulsion limiting structure, and the third repulsion limiting structure can be set separately, or the first repulsion limiting structure and the second repulsion limiting structure can be combined, or the first repulsion limiting structure and the third repulsion limiting structure can be combined.

[0060] Each contact unit includes a moving contact module with a first repulsion limiting structure. The first repulsion limiting structure includes a limiting part 30, which is disposed on the contact support 23. When the moving contact 21 is repelled by electrodynamic force and rotates relative to the rotating shaft 24, the limiting part 30 abuts against the end of the moving contact 21 away from the stationary contact 22, thereby limiting the rotation angle of the moving contact 21. During normal opening and closing, the moving contact 21 rotates synchronously with the rotating shaft 24, and the rotation angle of the moving contact 21 is consistent with that of the rotating shaft 24, preventing it from abutting against the limiting part 30. When a short-circuit current causes the moving contact 21 to be repelled by electrodynamic force, the moving contact 21 rotates relative to the rotating shaft 24, with a rotation angle greater than that of the rotating shaft 24. The moving contact 21 then abuts against the limiting part 30, which limits the rotation angle of the moving contact 21.

[0061] Thus, by setting the first repulsion limiting structure, the impact between the moving contact 21 and the housing can be buffered. The limiting part 30 is set on the contact support 23, so that the moving contact 21, the contact support 23 and the limiting part 30 form a modular structure. This simplifies assembly, allowing the moving contact module to be installed into the housing as a whole, and avoids major modifications to the contact support 23. In particular, it does not require changes to the structure of the existing molded case circuit breaker, which is conducive to the transformation and upgrading of existing products.

[0062] Specifically, such as Figure 4-11As shown, the first repulsion limiting structure is a baffle 3, which is fixedly mounted on the contact support 23. The baffle 3 has a limiting part 30, which is located between the two connecting walls 231 of the contact support 23. When the moving contact 21 is repelled by electrodynamic force, the limiting part 30 abuts against the moving contact 21. That is, the end of the moving contact 21 away from the moving contact point 211 abuts against the limiting part 30. Furthermore, the inner sidewall of the outer shell facing the stationary contact 22 is provided with a limiting inclined surface 112. Preferably, the limiting inclined surface 112 is located on the middle cover 11 facing the base 12. On one side, the moving contact 21 with a moving contact 211 swings between the limiting inclined surface 112 and the stationary contact 22. That is, the moving contact 21 away from the contact support 23 swings between the stationary contact 22 and the limiting inclined surface 112. When the moving contact 21 is repelled by the electric force, a gap is left between the side of the moving contact 21 facing away from the stationary contact 22 and the limiting inclined surface 112. The moving contact 21 and the limiting inclined surface 112 do not contact each other, avoiding the impact between the moving contact 21 and the middle cover 11, and preventing the huge impact force from damaging the moving contact 21. The baffle 3 can be a separate component, fixedly connected to the contact support 23, which has the advantages of simple structure and simple assembly. Alternatively, the baffle 3 and the contact support 23 can be an integral structure, or the limiting part 30 can be directly formed by the contact support 23, which can further simplify the assembly.

[0063] The second repulsion limiting structure is disposed on the inner side wall of the housing. The second repulsion limiting structure is spaced apart from the stationary contact 22. When the moving contact 21 is repelled by electrodynamic force, the side of the moving contact facing away from the stationary contact 22 makes elastic contact with the second repulsion limiting structure. In this way, the second repulsion limiting structure is spaced apart from the stationary contact 22, and the moving contact 21 makes elastic contact with the second repulsion limiting structure after being repelled, thereby buffering the impact of the moving contact 21 on the housing and avoiding affecting the performance of the moving contact 21.

[0064] Preferably, the second repulsion limiting structure is located on the side of the middle cover 11 facing the stationary contact 22. The second repulsion limiting structure can be an inclined surface that elastically abuts against the moving contact 21. Through elastic deformation, it buffers the impact force between the moving contact 21 and the middle cover 11, avoiding the impact on the performance of the moving contact 21.

[0065] Alternatively, the third repulsion limiting structure can also be a buffer groove 71 that can accommodate the moving contact 21. By providing an additional rotation distance for the moving contact 21, it helps to reduce the impact of the impact on the moving contact 21. Of course, the third repulsion limiting structure can also be an inclined surface of the middle cover 11 facing the moving contact 21. The contact surface between the inclined surface and the moving contact 21 is honeycomb-shaped, and reinforcing ribs can also be provided, but the effect is slightly worse.

[0066] Combination Figure 1-11 A first embodiment of a molded case circuit breaker is provided, wherein only a first repulsion limiting structure is provided inside the housing.

[0067] like Figure 1-3 As shown, the molded case circuit breaker includes a housing, which includes a base 12 and a middle cover 11 fitted onto the base 12. The middle cover 11 has an operating hole in its center, extending through both sides of the middle cover 11. At least one accessory slot is provided on the side of the middle cover 11 facing away from the base 12. Preferably, the accessory slots are symmetrically arranged on opposite sides of the operating hole. Each accessory slot is used to assemble an accessory module, such as a trip unit. The accessory slots can be closed by a face cover. An operating mechanism is provided between the base 12 and the middle cover 11. The operating element of the operating mechanism extends from the operating hole to the outside of the housing. For manually operating the molded case circuit breaker, at least one partition is provided inside the base 12, dividing the space inside the base 12 into at least two parallel mounting cavities. In this embodiment, the base 12 has three parallel mounting cavities, with the operating mechanism corresponding to the middle of the base 12. Each mounting cavity can be equipped with a contact unit, and each contact unit includes a pair of terminals. Each pair of terminals is spaced apart at opposite ends of the mounting cavity. A contact mechanism and an arc-extinguishing system are provided between a pair of terminals, wherein the contact mechanism includes a rotating shaft 24 and a moving contact. The module includes a stationary contact 22, wherein the rotating shaft 24 is driven and connected to the operating mechanism. The stationary contact 22 is fixed inside the base 12 and electrically connected to an adjacent terminal. The stationary contact 22 has a stationary contact point. The moving contact module is electrically connected to another terminal and driven and connected to the rotating shaft 24. That is, the moving contact module includes a contact support 23 and a moving contact 21. The contact support 23 is fixedly assembled inside the base 12. The moving contact 21 is electrically connected to another terminal and driven and connected to the rotating shaft 24. One end of the moving contact 21 has a moving contact point 211 for contacting the stationary contact 22. In coordination, the end of the moving contact 21 furthest from the stationary contact 22 is rotatably supported on a contact bracket 23; the arc extinguishing system is set on one side of the contact mechanism, and the arc extinguishing system extinguishes the arc generated by the contact mechanism. The arc extinguishing system can adopt existing technology, that is, the arc extinguishing system includes an arc extinguishing chamber 6, the moving contact 21 and the stationary contact 22 are arranged at intervals opposite each other at the arc inlet of the arc extinguishing chamber 6, the moving trajectory of the moving contact 21 corresponds to the arc inlet of the arc extinguishing chamber 6, and multiple arc extinguishing grids are arranged at intervals in the arc extinguishing chamber 6, which cut off the arc generated by the contact mechanism.

[0068] The rotating shaft 24 has a receiving cavity, and the moving contact 21 is disposed through the receiving cavity. One end of the moving contact 21 with the moving contact point 211 is located outside the receiving cavity, that is, the end of the moving contact 21 used to cooperate with the stationary contact 22 is located outside the receiving cavity. The end of the moving contact 21 away from the stationary contact 22 is rotatably mounted to the contact bracket 23 via the connecting shaft 233. The end of the moving contact 21 away from the stationary contact 22 and the connecting shaft 233 are mounted in the receiving cavity. Preferably, the end of the moving contact 21 away from the stationary contact 22 is rotatable via the connecting shaft 233. The two connecting walls 231 of the contact bracket 23 are assembled together. Each moving contact 21 includes at least two parallel moving contact pieces 210. The ends of the at least two moving contact pieces 210 away from the stationary contact 22 are electrically connected, for example, they are all electrically connected to the same terminal. A boss is provided in the middle of the connecting shaft 233. Two adjacent moving contact pieces 210 are separated by the boss. By setting multiple moving contact pieces 210, the current carrying capacity of the moving contact 21 can be increased. Multiple moving contact pieces 210 are assembled into a moving contact module by the contact bracket 23 and the connecting shaft 233.

[0069] In this embodiment, the first repulsion limiting structure is a baffle 3, which is fixed between the two connecting walls 231 of the contact support 23. The baffle 3 has a limiting part 30, which is located between the two connecting walls 231 of the contact support 23. The baffle 3, the moving contact 21, and the contact support 23 together form a moving contact module, which facilitates the integral assembly of the moving contact module into the housing. At the same time, the baffle 3 is located between the two connecting walls 231 of the contact support 23, which can prevent the baffle 3 from occupying too much space. Preferably, the limiting part 30 is a sloping surface that can abut against the moving contact 21. When the moving contact 21 is repelled by electrodynamic force, the limiting part 30 abuts against the repelled moving contact 21, thereby limiting the moving contact 21 from continuing to move in the opening direction, so as to reduce the impact between the moving contact 21 and the middle cover 11.

[0070] Combination Figure 4-8 A contact support 23 structure is provided for use in this embodiment. The contact support 23 can adopt existing technology. For example... Figure 4 , 5 As shown in Figures 7 and 8, the contact support 23 is an integrally bent U-shaped structure. The contact support 23 includes a pair of spaced connecting walls 231. One end of the pair of connecting walls 231 is connected through the bottom wall 232. Each connecting wall 231 has a connecting hole at the end away from the bottom wall 232. A connecting shaft 233 is assembled between the two connecting holes. The moving contact 21 is rotatably assembled on the contact support 23 through the connecting shaft 233. The middle part of the bottom wall 232 is fixed to the base 12 by fasteners.

[0071] Combination Figure 1-6 A first baffle 3 structure applied in this embodiment is provided, such as Figure 1-3As shown in Figures 5 and 6, the baffle 3 includes a support wall 31. In the figures, the support wall 31 is arranged along a direction perpendicular to the bottom wall 232 of the contact bracket 23. One end of the support wall 31 is bent and extends horizontally to form a horizontal wall 32. The middle part of the horizontal wall 32 is connected to the bottom wall 232 of the contact bracket 23 by fasteners. Alternatively, the horizontal wall 32 and the bottom wall 232 can be fixed together in the base 12 by fasteners. The other end of the support wall 31 is bent and extends in a direction away from the horizontal wall 32 to form an inclined wall 33. The end of the inclined wall 33 away from the support wall 31 extends obliquely in a direction close to the horizontal wall 32 to form a limiting part 30. Figure 1-6 In the middle, the limiting part 30 is a slope. When the baffle 3 is assembled on the contact bracket 23, the support wall 31 is located on the side close to the stationary contact 22, and the limiting part 30 is located on the side away from the stationary contact 22, which is used to abut against the end of the moving contact 21 away from the stationary contact 22.

[0072] Furthermore, in combination Figure 4 , 5 A second baffle 3 structure is provided for use in this embodiment, such as... Figure 4 , 5 As shown, the baffle 3 and the contact support 23 are an integral structure. That is, the bottom wall 232 of the contact support 23 and the horizontal wall 32 of the baffle 3 are the same structure. The support wall 31 of the baffle 3 is formed by bending and extending the edge of the bottom wall 232 of the contact support 23. The inclined wall 33 is also formed by bending and extending one end of the support wall 31. The inclined wall 33 is also located between the two connecting walls 231 of the contact support 23. The baffle 3 and the contact support 23 are an integral structure, which can further simplify assembly, save materials, and reduce costs.

[0073] Combination Figure 7-9 A third baffle 3 structure is provided for use in this embodiment, such as... Figure 9 As shown, the baffle 3 includes two opposing support walls 31 spaced apart. Figure 9 In this configuration, each support wall 31 is arranged along a direction perpendicular to the bottom wall 232 of the contact support 23. One end of each support wall 31 is bent and extends horizontally to form a horizontal wall 32, and the other end of each support wall 31 extends in a direction away from the horizontal wall 32 to form an inclined wall 33. The two inclined walls 33 are joined at an angle. When the baffle 3 is arranged on the contact support 23, the two inclined walls 33 are joined at an angle between the two support walls 31. One of the inclined walls 33 serves as a limiting part 30. Preferably, the limiting part 30 is located on the side away from the stationary contact 22. The two horizontal walls 32 are parallel to each other between the two support walls 31. One of the horizontal walls 32 is used to be fixedly connected to the bottom wall 232 of the contact support 23.

[0074] like Figure 9-11As shown, the two inclined walls 33 in the baffle 3 are divided into a long inclined wall 33 and a short inclined wall 33. The long inclined wall 33 serves as the limiting part 30. Using the longer long inclined wall 33 as the limiting part 30 increases the contact area between the moving contact 21 and the inclined wall 33, which in turn increases the contact area between the moving contact 21 and the limiting part 30, making it more conducive to the limiting contact and abutment of the moving contact 21 against the long inclined wall 33. The two horizontal walls 32 are also divided into a long horizontal wall 32 and a short horizontal wall 32. The long horizontal wall 32 is connected to the bottom wall 232 of the contact support 23, which increases the contact area between the long horizontal wall 32 and the contact support 23, thus improving stability. In addition, in this embodiment, the inclination angle and length of the long inclined wall 33 can be adjusted according to actual needs, for example... Figure 10 The fourth structure of the middle baffle 3 and Figure 11 The fifth structure of the middle baffle 3 is suitable for different products. It should be noted that the long horizontal wall 32 and the long inclined wall 33 are connected to the same support wall 31, so as to better ensure the balance and stability of the baffle 3 and the contact support 23.

[0075] In addition, the third, fourth and fifth structures of the baffle 3 can also be integrated with the contact support 23. In this case, the bottom wall 23 of the contact support 23 and the long horizontal wall can be combined into one structure.

[0076] In this embodiment, a limiting inclined surface 112 is provided on the inner sidewall of the outer casing facing the stationary contact 22, such as... Figure 1-3 As shown, a limiting inclined surface 112 is provided on the side of the middle cover 11 facing the stationary contact 22. One end of the moving contact 21, away from the contact support 23, swings between the limiting inclined surface 112 and the stationary contact 22. When the moving contact 21 is repelled by the electric force, a gap remains between the side of the moving contact 21 facing away from the stationary contact 22 and the limiting inclined surface 112. When the moving contact 21 contacts the stationary contact 22, the angle between the moving contact 21 and the horizontal plane is θ, which is 1.67°. When the moving contact 21 is repelled by the electric force, the gap between the moving contact 21 and the horizontal plane... The angle is β, and the included angle β is 27.17°. The included angle between the limiting inclined surface 112 and the horizontal plane is slightly larger than the included angle β between the moving contact 21 and the horizontal plane. Preferably, after the moving contact 21 is repelled, there is an included angle α between the side of the moving contact 21 facing away from the stationary contact 22 and the limiting inclined surface 112. The included angle α is in the range of 1 to 3°, that is, the included angle α is in the range of 28.17° to 30.17°, so that there is no direct contact between the moving contact 21 and the limiting inclined surface 112, and the moving contact 21 is prevented from directly colliding with the middle cover 11.

[0077] Combination Figure 12-14A second embodiment of a molded case circuit breaker is provided. In this embodiment, only a second repulsion limiting structure is provided inside the housing. After the moving contact 21 is repelled by electrodynamic force, the moving contact 21 elastically contacts the second repulsion limiting structure, thereby buffering the impact between the moving contact 21 and the housing.

[0078] like Figure 12 As shown, the molded case circuit breaker includes an outer shell, which includes a base 12 and a middle cover 11 that fits onto the base 12. An operating mechanism is rotatably mounted between the base 12 and the middle cover 11. A contact system is mounted inside the base 12. In this embodiment, the base 12, the operating mechanism, and the contact system of the outer shell adopt the same structure as in the first embodiment. The middle cover 11 is improved based on the first embodiment. In this embodiment, the middle cover 11 no longer has a limiting slope 112 on the side facing the base 12. Instead, at least one receiving groove is provided on the side of the middle cover 11 facing the base 12. The number of receiving grooves in the middle cover 11 corresponds to the number of mounting cavities in the base 12. Each receiving groove is preferably adjacent to the accessory groove of the middle cover 11, and the opening of the receiving groove faces the base 12.

[0079] In this embodiment, as Figure 12 , 13 As shown, the second limiting structure includes an elastic element 41 and a contact element 42. The elastic element 41 is connected to the bottom of the receiving groove and the side of the contact element 42 facing away from the stationary contact 22. The contact element 42 can slide in the receiving groove to prevent the movement of the contact element 42 and the elastic element 41 from interfering with the movement of other components of the molded case circuit breaker. A pressing slope 420 is provided on the side of the contact element 42 facing the stationary contact 22. When the moving contact 21 is repelled by electrodynamic force, the moving contact 21 elastically abuts against the pressing slope 420. With the elastic deformation of the elastic element 41, the contact element 42 can move in the receiving groove, thereby achieving the buffering of the impact between the moving contact 21 and the contact element 42 by the elastic element 41.

[0080] Furthermore, such as Figure 13 , 14 As shown, a sliding rail 421 and a sliding part 111 are provided between the contact member 42 and the receiving groove. The sliding rail 421 and the sliding part 111 cooperate to limit the movement trajectory of the contact member 42 and prevent the contact member 42 from shaking excessively. In addition, a buckle 422 is provided on the edge of the connector. The buckle 422 cooperates with the middle cover 11 to prevent the contact member 42 from falling out of the receiving groove.

[0081] Combination Figure 13 , 14 A specific structure for the contact 42 applied in this embodiment is provided.

[0082] like Figure 13 , 14As shown, the contact member 42 is a hexahedron with an inclined surface, which serves as the pressing inclined surface 420 of the contact member 42. A circular groove is provided in the middle of the side of the hexahedron facing away from the pressing inclined surface 420. One end of the elastic member 41 is fitted into the circular groove, and the other end of the elastic member 41 is fixedly connected to the bottom of the receiving groove. At least one side wall of the hexahedron is provided with a strip-shaped sliding groove. Correspondingly, a strip-shaped sliding rail 421 protrudes from the side wall of the receiving groove. The sliding rail 421 slides with the sliding groove, thereby realizing the sliding engagement between the contact member 42 and the receiving groove. The contact member 42 is also provided with a buckle 422, such as... Figure 13 , 14 As shown, two strip-shaped protrusions extend from the side opposite to the pressing inclined surface 420. The tail end of each protrusion forms a hook-shaped buckle 422. A strip-shaped slot (not shown) is provided in the receiving groove. The bottom of the slot can abut against the buckle 422, and the buckle 422 can slide in a straight line in the slot along the direction away from the bottom of the slot. In this embodiment, the sliding direction of the contact member 42 is perpendicular to the bottom surface direction of the base 12.

[0083] When the contact mechanism is in normal opening and closing position, the moving contact 21 is not in contact with the pressing inclined surface 420. At this time, the latch 422 and the bottom of the slot cooperate with each other, so that the contact member 42 cannot fall out of the receiving slot under the drive of the elastic member 41. When the moving contact 21 is repelled by the electric force, the side of the moving contact 21 facing away from the stationary contact 22 abuts against the pressing inclined surface 420. As the moving contact 21 rotates, the contact member 42 presses the elastic member 41, causing the elastic member 41 to deform. At the same time, the latch 422 of the contact member 42 slides in the slot along the direction away from the bottom of the slot. The elastic member 41 buffers the impact between the moving contact 21 and the contact member 42, preventing damage to the moving contact 21.

[0084] In this embodiment, preferably, the end of the moving contact 21 away from the contact support 23 elastically abuts against the contact member 42, and the size (e.g., width) of the contact member 42 matches the end of the moving contact 21 away from the contact support 23.

[0085] Furthermore, in this embodiment, the receiving groove provided on the middle cover 11 is a through groove. The buckle 422 of the elastic member 41 and the contact member 42 protrudes from the same end of the receiving groove, and the pressing slope 420 of the contact member 42 protrudes from the other end of the receiving groove. That is, the buckle 422 of the elastic member 41 and the contact member 42 protrudes from the end of the receiving groove away from the base 12, and the pressing slope 420 protrudes from the end of the receiving groove close to the base 12. When the contact member 42 and the elastic member 41 are damaged, the contact member 42 is pushed to separate from the receiving groove from the end of the receiving groove away from the base 11, so that the contact member 42 can be replaced. It has the advantages of low cost and easy replacement.

[0086] This embodiment can be used in conjunction with the first embodiment.

[0087] Combination Figure 15-16 A third embodiment of a molded case circuit breaker is provided, in which only a second repulsion limiting structure is provided inside the casing.

[0088] like Figure 15 As shown, the molded case circuit breaker includes a housing, which includes a base 12 and a middle cover 11 that fits onto the base 12. An operating mechanism is rotatably mounted between the base 12 and the middle cover 11. A contact system is mounted inside the base 12. In this embodiment, the base 12, the operating mechanism, and the contact system of the housing adopt the same structure as in the first embodiment. The middle cover 11 is improved based on the first embodiment. In this embodiment, a groove is provided on one side of the accessory groove of the middle cover 11. The bottom edge of the groove communicates with the space inside the base 12 to form a slot. A clearance space 113 is reserved on the side of the middle cover 11 facing the stationary contact 22. The clearance space 113 is adjacent to the slot.

[0089] In this embodiment, the second repulsion limiting structure includes a spring piece 5. One end of the spring piece 5 is fixed to the middle cover 11, and the other end of the spring piece 5 extends obliquely within the base 12 along a direction deviating from the middle cover 11 to form an abutment slope 53, which, in conjunction with... Figure 16 A spring sheet 5 structure is provided for application in this embodiment. The spring sheet 5 is strip-shaped. One end of the spring sheet 5 serves as a fixing part 51, which extends horizontally and is provided with a fixing hole 54. The middle part of the spring sheet 5 is bent at least once to form a bent part. In the figure, the middle part of the spring sheet 5 is first bent vertically once, so that the connecting part 52 and the fixing part 51 form an L-shaped structure. The other end of the spring sheet 5 extends obliquely in a direction away from the fixing part 51. The side plate surface facing the stationary contact 22 from the other end of the spring sheet 5 serves as an abutting slope 53. The abutting slope 53 can move elastically within the clearance space 113. In this embodiment, the spring sheet 5 is Z-shaped as a whole.

[0090] In this embodiment, the fixing part 51 is inserted into the slot along the horizontal direction, so that the fixing part 51 is accommodated in the groove of the middle cover 11. Screws and other fasteners are installed in the fixing hole 54. The spring piece 5 is fixed to the middle cover 11 by the fasteners. The connecting part 52 is attached to the straight side wall inside the middle cover 11, so that the other end of the spring piece 5 extends obliquely inside the outer shell. When the contact mechanism is normally opening and closing, the end of the moving contact 21 near the stationary contact 22 does not contact the abutting slope 53. When the moving contact 21 is repelled by the electric force, the moving contact 21 elastically contacts the abutting slope 53. The abutting slope 53 generates elastic displacement in the clearance space 113 to buffer the impact force of the moving contact 21, thereby avoiding the moving contact 21 directly hitting the middle cover 11 and affecting the performance of the moving contact 21.

[0091] Of course, in this embodiment, the spring piece 5 and the middle cover 11 can also adopt a simplified structure. For example, the spring piece 5 no longer has a fixing part 51. Correspondingly, the middle cover 11 no longer has a groove and slot for accommodating the fixing part 51. The connecting part 52 of the spring piece 5 is directly fixed to the side wall of the middle cover 11. The abutting slope 53 still corresponds to the clearance space 113 and can undergo elastic displacement within the clearance space 113. However, the simplified spring piece 5 is relatively poor in terms of connection stability.

[0092] This embodiment can be used in conjunction with the first embodiment.

[0093] Combination Figure 17-19 A fourth embodiment of a molded case circuit breaker is provided. In this embodiment, a third repulsion limiting structure is provided inside the casing. Similar to the second and third embodiments, the third repulsion limiting structure can be used in conjunction with the first embodiment.

[0094] like Figure 17 As shown, the molded case circuit breaker includes a housing, which includes a base 12 and a middle cover 11 that covers the base 12. An operating mechanism is rotatably mounted between the base 12 and the middle cover 11. A contact system is mounted inside the base 12. In this embodiment, the housing, operating mechanism and contact system can adopt existing technologies.

[0095] In this embodiment, the third repulsion limiting structure is fixed to the end of the arc-extinguishing chamber 6 near the moving contact 21. The third repulsion limiting structure has a buffer groove 71 that can accommodate the moving contact 21. The buffer groove 71 faces the contact mechanism. When the moving contact 21 is normally opening and closing, the buffer groove 71 is spaced apart from the moving contact 21. When the moving contact 21 is repelled by electrodynamic force, at least a part of the side of the moving contact 21 facing away from the stationary contact 22 is accommodated in the buffer groove 7.

[0096] Preferably, a plurality of buffer posts 72 are provided in the buffer groove 71, and the multiple buffer posts 72 abut against the moving contact 21, so that the moving contact 21 and the buffer posts 72 have multiple contact points. By increasing the contact area, the impact force on the moving contact 21 is not too large, thereby affecting the performance of the moving contact 21.

[0097] like Figure 17-19 As shown, the third repulsion limiting structure includes a reflector plate 7. In this embodiment, the reflector plate 7 is fixed to the outside of the arc-extinguishing chamber 6 near the moving contact 21, so that the reflector plate 7 is located between the arc-extinguishing chamber 6 and the middle cover 11. A buffer groove 71 is provided on the side of the reflector plate 7 facing the stationary contact 22, as shown. Figure 19As shown, the bottom of the buffer groove 71 is provided with multiple buffer posts 72. Each buffer post 72 is a strip-shaped protrusion, and the protrusion height of the buffer post 72 is less than the groove depth of the buffer groove 71. When the contact mechanism is normally opening and closing, the side of the moving contact 21 facing away from the stationary contact 22 is outside the buffer groove 71, or part of the side of the moving contact 21 facing away from the stationary contact 22 is located inside the buffer groove 71, but does not contact the buffer post 72. When the moving contact 21 is repelled by the electric force, the side of the moving contact 21 facing away from the stationary contact 22 is taken into the buffer groove 71. By providing an additional rotation distance for the moving contact 21, it is beneficial to reduce the impact on the moving contact 21. In conjunction with the buffer posts 72 set in the buffer groove 71, by increasing the contact area, it is avoided that the impact force on the moving contact 21 is too large, thereby affecting the performance of the moving contact 21.

[0098] In this embodiment, each moving contact 21 includes at least two parallel moving contact pieces 210. Each moving contact piece 210 has a moving contact point 211 at one end. The stationary contact 22 can be provided with a stationary contact point with a larger area, or the stationary contact 22 can be provided with multiple stationary contacts, so that the moving contact point 211 corresponds to the stationary contact point one by one. The side of each moving contact blade facing away from the stationary contact 22 is used to abut against the buffer post 72. Preferably, the buffer groove 71 only accommodates one end of the moving contact 21 that cooperates with the stationary contact 22, which can save the material of the reflector 7 and reduce the space occupied by the reflector 7 in the housing.

[0099] Of course, the buffer groove 71 in this embodiment can also be directly set on the side of the middle cover 11 facing the stationary contact 22.

[0100] Combination Figure 20 , 21 A fifth embodiment of a molded case circuit breaker is provided, which is the same as the fourth embodiment. This embodiment only provides a third repulsion limiting structure, and the third repulsion limiting structure is also fixedly installed outside the arc-extinguishing chamber 6 at one end near the moving contact 21.

[0101] like Figure 20 , 21 As shown, the third repulsion limiting structure includes an arc-extinguishing cover 8, which is located between the middle cover 8 and the arc-extinguishing chamber 6. Preferably, all contact systems inside the outer shell share one arc-extinguishing cover 8. The arc-extinguishing cover 8 is fixed to the outside of the arc-extinguishing chamber 6 near the moving contact 21. A buffer groove 71 is provided on the side of the arc-extinguishing cover 8 facing the contact mechanism. The buffer groove 71 has a certain depth. When the moving contact 21 is repelled by electrodynamic force, the side of the moving contact 21 facing away from the stationary contact 22 is housed in the buffer groove 71. The buffer groove 71 provides an additional movement distance for the moving contact 21, which can buffer the impact between the moving contact 21 and the middle cover 11.

[0102] Furthermore, an observation window 81 is provided at the bottom of the buffer groove 71. The positional relationship of the moving contact 21 can be observed through the observation window 81. That is, when the moving contact 21 is in contact with the observation window 81, it is determined that the moving contact 21 is repelled by electrodynamic force. When the moving contact 21 is at a certain distance from the observation window 81, it indicates that the moving contact 21 is in the open position. When the moving contact 21 cannot be observed or the distance between the moving contact 21 and the observation window 81 is obviously large, it is determined that the moving contact 21 is in the closed position. In this embodiment, the arc extinguishing cover 8 is made of DMC material. When the middle cover 11 is made of transparent material, the moving contact 21 can be visualized.

[0103] A sixth embodiment of a molded case circuit breaker is provided. In this embodiment, only a third repulsion limiting structure is provided inside the housing, and the third limiting structure is provided on the inner side wall of the housing.

[0104] In this embodiment, the molded case circuit breaker includes an outer shell, which includes a base 12 and a middle cover 11 that covers the base 12. An operating mechanism is rotatably mounted between the base 12 and the middle cover 11. A contact system is mounted inside the base 12. In this embodiment, the base 12, the operating mechanism, and the contact system of the outer shell adopt the same structure as in the first embodiment. The middle cover 11 is provided with the same limiting slope 112 as in the first embodiment. The limiting slope 112 is honeycomb-shaped or has protruding reinforcing ribs to enhance the anti-collision capability of the middle cover 11 and prevent the impact of the moving contact 21 and the middle cover 11 on the circuit breaker.

[0105] This embodiment can be used in conjunction with the first embodiment.

[0106] 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.

[0107] 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 molded case circuit breaker, comprising a housing, wherein an operating mechanism and at least one contact system are disposed within the housing, each contact system comprising a contact mechanism, the contact mechanism comprising a rotating shaft (24), a moving contact module and a stationary contact (22), the moving contact module comprising a moving contact (22) and the rotating shaft (24), the moving contact (22) being driven to the rotating shaft (24), the operating mechanism driving the rotating shaft (24) to cause the moving contact (23) to contact or separate from the stationary contact (22), characterized in that: The housing is also provided with a repulsion limiting structure. When the moving contact (21) is repelled by electric force and rotates relative to the rotating shaft (24), the repulsion limiting structure limits the rotation angle of the moving contact (21).

2. The molded case circuit breaker according to claim 1, characterized in that: The repulsion limiting structure includes a second repulsion limiting structure, which is spaced apart from the stationary contact (22). When the moving contact (21) is repelled by electrodynamic force, the side of the moving contact (21) facing away from the stationary contact (22) makes elastic contact with the second repulsion limiting structure.

3. The molded case circuit breaker according to claim 1, characterized in that: The housing includes a base (12) and a middle cover (11) covering the base (12). The middle cover (11) has a second repulsion limiting structure on the side facing the stationary contact (22). The second repulsion limiting structure has an inclined surface, which is in elastic contact with the side of the moving contact (21) opposite to the stationary contact (22).

4. The molded case circuit breaker according to claim 3, characterized in that: The second repulsion limiting structure includes an elastic element (41) and a contact element (42). The contact element (42) has a pressing slope (420) on the side facing the stationary contact (22). The pressing slope (420) is used to elastically abut against the moving contact (21). The side of the contact element (42) facing away from the stationary contact (22) is connected to the elastic element (41). The elastic element (41) buffers the impact between the moving contact (21) and the contact element (42).

5. The molded case circuit breaker according to claim 4, characterized in that: The inner wall of the outer casing is provided with a receiving groove. The elastic member (41) is connected to the side of the contact member (42) facing away from the stationary contact (22). The contact member (42) is slidably assembled in the receiving groove. The contact member (42) and the receiving groove are slidably engaged with each other through a sliding rail (421) and a sliding part (111).

6. The molded case circuit breaker according to claim 3 or 4, characterized in that: The inner wall of the outer casing is provided with a strip-shaped slot, and the contact member (42) is provided with a buckle (422). When the moving contact (21) is not in contact with the limiting inclined surface (112), the buckle (422) is engaged with the bottom of the slot to prevent the contact member (42) from falling off. When the moving contact (21) is in contact with the limiting inclined surface (112), the buckle (422) slides along the direction away from the bottom of the slot.

7. The molded case circuit breaker according to claim 4, characterized in that: The second repulsion limiting structure includes a spring piece (5), one end of which is fixed to the middle cover (11), and the other end of which extends obliquely within the outer shell along a direction deviating from the middle cover (11) to form an abutting slope (53), which is used to elastically abut against the moving contact (21).

8. The molded case circuit breaker according to claim 7, characterized in that: The spring (5) is strip-shaped. One end of the spring (5) extends horizontally as a fixing part (51) and is provided with a fixing hole (54). The middle part of the spring (5) is bent at least once to form a connecting part (52). The other end of the spring (5) extends obliquely in a direction away from the fixing part (51), and the side plate surface facing the stationary contact (22) from the other end of the spring (5) serves as an abutting slope (53).

9. The molded case circuit breaker according to claim 1, characterized in that: The moving contact module also includes a contact bracket (23), which is fixed inside the housing, and the moving contact (22) is rotatably mounted on the contact bracket (23). The repulsion limiting structure further includes a first repulsion limiting structure. The first repulsion limiting structure is disposed on the moving contact module. The first repulsion limiting structure includes a limiting part (30). The limiting part (23) is disposed on the contact support (23). The limiting part (30) abuts against the end of the moving contact (21) away from the stationary contact (22) to limit the rotation angle of the moving contact (21).

10. The molded case circuit breaker according to claim 9, characterized in that: The moving contact module also includes a baffle (3), which is fixed between the two connecting walls (231) of the contact bracket (23), and the limiting part (30) is disposed on the baffle (3).

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