Tripping device for drawer type circuit breaker

Abstract

The utility model provides a tripping device for a drawer type circuit breaker. The tripping device comprises a circuit breaker body, a drawer device, a tripping plate, a driving piece, a guiding piece, a tripping rod, a side plate and a buckle plate reset spring. The tripping rod is rotatably installed on the circuit breaker body. And the circuit breaker body enters or exits from the drawer device under the driving of the driving piece. The relative positions of the circuit breaker body and the drawer device comprise: an isolation position in which the circuit breaker body cannot be switched on; at the test position, the circuit breaker body can be switched on; when the connection position is in an unlocking state, the circuit breaker body can be switched on. Through linkage of the driving piece and the tripping plate, the circuit breaker body is firstly tripped in the process of entering the connecting position and then is unlocked again, the circuit breaker body can be switched on, and the structure is simple and reliable. And meanwhile, the guide piece is matched, so that the circuit breaker body cannot be switched on at the isolation position and can be switched on at the test position, and the drawer type low-voltage circuit breaker is safer and more reliable.

Description

Technical Field

[0001] This invention relates to low-voltage circuit breakers, and more particularly to the tripping device of circuit breakers. Background Technology

[0002] In low-voltage power distribution equipment, drawer units are often used to enable rapid connection and deployment of components such as circuit breakers to power lines, or rapid disconnection and isolation during maintenance. Typically, the circuit breaker body is mounted on the drawer unit, with the external busbar connected to the drawer unit's terminal block. The circuit breaker body busbar is connected to the drawer unit's electrical connection device. The terminal block and electrical connection device of the drawer unit are assembled as a single unit, thus forming an electrical path between the circuit breaker body and the external busbar. To facilitate maintenance of the circuit breaker body on the drawer unit, isolation, test, and connection positions are provided. In the isolation position, the circuit breaker body busbar is not connected to the drawer unit's electrical connection device, and there is sufficient isolation distance. The circuit breaker body's mechanism is tripped by the tripping device, preventing the contact system from closing, allowing for manual maintenance. In the test position, the circuit breaker body busbar is not connected to the drawer unit's electrical connection device, but some secondary circuits of the circuit breaker body and the drawer unit are connected, allowing for control circuit testing. In the connection position, the circuit breaker body busbar is connected to the drawer unit's electrical connection device, allowing for opening and closing operations and connection to external circuits. The current structure is too complex and not simple or reliable enough. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a tripping device for a drawer-type low-voltage circuit breaker that is reliable in operation, accurate in positioning, and ensures safe maintenance.

[0004] To achieve the above objectives, this invention designs a tripping device for a drawer-type circuit breaker, comprising a circuit breaker body, a drawer assembly, a tripping plate, a driving component, a guide component, a tripping lever, a side plate, and a return spring for the tripping plate. The tripping lever is rotatably mounted on the circuit breaker body. The circuit breaker body enters or exits the drawer assembly under the drive of the driving component. The relative positions of the circuit breaker body and the drawer assembly include: an isolated position, where the circuit breaker body cannot be closed; a test position, where the circuit breaker body can be closed; and a connected position (unlocked state), where the circuit breaker body can be closed. Characteristically, during the process of the circuit breaker body entering the connected position, the tripping plate drives the circuit breaker body to trip, preventing the circuit breaker body from closing; then the tripping plate unlocks, allowing the circuit breaker body to close.

[0005] Furthermore, the trip plate is provided with a trip plate shaft hole, and the trip plate is rotatably mounted on the side plate through the trip plate shaft hole. The trip plate has a locking section facing the trip rod on the circuit breaker body. The trip plate has a first mating section and a second mating section sequentially facing the drive component. The trip plate is bent into a stop section facing the side plate. The trip plate is also provided with a reset hole for installing the trip plate reset spring.

[0006] Furthermore, the driving component is provided with a driving shaft hole, and the driving component is rotatably mounted on the side plate through the driving shaft hole. The driving component has a first driving end, a second driving end, and a third driving end arranged sequentially towards the trip plate, with a smooth transition between the first driving end, the second driving end, and the third driving end.

[0007] Furthermore, the trip lever is provided with a rotating shaft. An operating end is provided at one end of the trip lever facing the trip plate. The operating end is a protruding rod with a different center of rotation than the rotating shaft. When the rotating shaft rotates, the operating end can swing with the shaft. A tripping end is provided at the other end of the trip lever, and the tripping end rotates together with the rotating shaft. The trip lever is rotatably mounted inside the circuit breaker body via a shaft. The operating end protrudes outside the circuit breaker body. When the operating end is moved, the rotating shaft moves accordingly, and the tripping end is also driven to rotate.

[0008] Furthermore, the guide member is provided with mounting holes, through which it is fixed to the side plate. On the side of the guide member opposite the tripping lever, facing the tripping plate, are sequentially provided a first transition edge, a separation edge, a second transition edge, a test edge, a third transition edge, and a tripping edge. The separation edge and the tripping edge protrude towards the tripping lever. The first transition edge, the second transition edge, and the third transition edge naturally slope and transition with adjacent edges.

[0009] Furthermore, the side panel has guide mounting holes on the outside of the drawer assembly above the release lever, and the guides are fixed to the side panel via these holes. The side panel also has snap-on holes on the inside of the drawer assembly, through which the release plate is rotatably mounted. The side panel further has snap-on stop windows corresponding to the stop position of the release plate, with lower and upper stop edges on the stop windows, allowing the stop to swing within the stop windows. A drive hole is located below the snap-on holes on the side panel, through which the drive component is rotatably mounted.

[0010] Furthermore, during the rotation of the driving component, the first driving end can push the trip plate to rotate, causing the locking section of the trip plate to move closer to the operating end on the trip rod. During the rotation of the driving component, the second driving end can push the trip plate to rotate, causing the locking section of the trip plate to lock the operating end on the trip rod, preventing the circuit breaker body from closing. During the rotation of the driving component, the third driving end can push the trip plate to rotate, causing the locking section of the trip plate to move away from the operating end on the trip rod, allowing the circuit breaker body to close.

[0011] The technical advantage of this invention lies in the linkage between the driving component and the trip plate, which allows the circuit breaker body to be first untripped and then re-unlocked during the connection process, enabling the circuit breaker body to close. This results in a simple and reliable structure. Furthermore, in conjunction with the guide component, the circuit breaker body can be prevented from closing in the isolation position and can be closed in the test position, making the drawer-type low-voltage circuit breaker safer and more reliable. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of a tripping device for a drawer-type circuit breaker according to the present invention.

[0013] Figure 2 This is a schematic diagram of the tripping device for a drawer-type circuit breaker according to the present invention installed on the side plate.

[0014] Figure 3 This is a schematic diagram of the side plate of a tripping device for a drawer-type circuit breaker according to the present invention.

[0015] Figure 4 This is a schematic diagram of the tripping plate of a tripping device for a drawer-type circuit breaker according to the present invention.

[0016] Figure 5 This is a schematic diagram of the structure of the drive component of a tripping device for a drawer-type circuit breaker according to the present invention.

[0017] Figure 6 This is a schematic diagram of the structure of the guide component of the tripping device for a drawer-type circuit breaker according to the present invention.

[0018] Figure 7 This is a schematic diagram of the tripping lever of a tripping device for a drawer-type circuit breaker according to the present invention.

[0019] Figure 8 This is a schematic diagram illustrating the transition from the initial position to the isolation position of a tripping device for a drawer-type circuit breaker according to the present invention.

[0020] Figure 9 This is a schematic diagram of the isolation position of a tripping device for a drawer-type circuit breaker according to the present invention.

[0021] Figure 10 This is a schematic diagram of the test position of a tripping device for a drawer-type circuit breaker according to the present invention.

[0022] Figure 11 This is a schematic diagram illustrating the transition from the test position to the connection position of a tripping device for a drawer-type circuit breaker according to the present invention.

[0023] Figure 12 This is a schematic diagram of the connection position locking state of a tripping device for a drawer-type circuit breaker according to the present invention.

[0024] Figure 13 This is a schematic diagram of the connection position unlocking process of a tripping device for a drawer-type circuit breaker according to the present invention.

[0025] Figure 14 This is a schematic diagram of the connection position and working state of a tripping device for a drawer-type circuit breaker according to the present invention.

[0026] Figure 15 This is a schematic diagram of the non-connected position of the second embodiment of the tripping device for a drawer-type circuit breaker according to the present invention.

[0027] Figure 16 This is a schematic diagram of the connection position unlocking process of the second embodiment of the tripping device for a drawer-type circuit breaker according to the present invention.

[0028] Figure 17 This is a schematic diagram of the connection position and working state structure of the second embodiment of the tripping device for a drawer-type circuit breaker according to the present invention. Detailed Implementation

[0029] The features and exemplary embodiments of various aspects of this application will be described in detail below. To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain this application and not to limit it. For those skilled in the art, this application can be implemented without some of these specific details. The following description of the embodiments is merely to provide a better understanding of this application by illustrating examples.

[0030] Marker explanation:

[0031] Tripping plates 1 and 1a, first mating sections 101 and 101a, second mating sections 102 and 1021a, locking sections 103 and 103a, fourth mating sections 104 and 104a, trip plate shaft holes 105 and 105a, stop protrusions 106 and 106a, reset holes 107 and 107a, and second auxiliary mating section 1022a.

[0032] Drive component 2, first drive end 201, second drive end 202, third drive end 203, drive shaft hole 204, body drive groove 205.

[0033] Guide component 3, mounting hole 301, first transition edge 302, separation edge 303, second transition edge 304, test edge 305, third transition edge 306, tripping edge 307.

[0034] Release lever 4, operating end 401, rotating shaft 402, release end 403;

[0035] Side panel 5, snap-on stop window 501, lower snap-on stop edge 5011, upper snap-on stop edge 5012, guide mounting hole 503, spring hole 506, snap-on hole 507, drive hole 508.

[0036] 6. Snap plate reset spring, 7. Snap plate shaft, 8. Drive shaft, 9. Circuit breaker body, 10. Body drive element, 11. Drawer device.

[0037] Figure 1 As shown, an embodiment of the tripping device for a drawer-type circuit breaker according to the present invention includes a tripping plate 1, a driving member 2, a guide member 3, a tripping rod 4, a side plate 5, a tripping plate reset spring 6, a tripping plate shaft 7, a driving shaft 8, a circuit breaker body 9, a body drive 10, and a drawer device 11.

[0038] Among them, such as Figure 4 As shown, the trip plate 1 is provided with a trip plate shaft hole 105, and the trip plate 1 is rotatably mounted on the side plate 5 through the trip plate shaft hole 105. The trip plate 1 has a locking section 103 facing the trip rod 4 on the circuit breaker body 9. The trip plate 1 has a first mating section 101 and a second mating section 102 sequentially facing the driving member 2. The trip plate 1 is bent to form a stop section 106 facing the side plate 5. The trip plate 1 is also provided with a reset hole 107 for installing the trip plate reset spring 6.

[0039] like Figure 5 As shown, the driving component 2 is provided with a driving shaft hole 204, and the driving component 2 is rotatably mounted on the side plate 5 through the driving shaft hole 204. The outer edge of the driving component 2 is provided with a first driving end 201, a second driving end 202, and a third driving end 203 sequentially arranged towards the trip plate 1, with a smooth transition between the first driving end 201, the second driving end 202, and the third driving end 203. The driving component 2 also has a body driving groove 205 for driving the circuit breaker body 9 to move within the drawer device 11.

[0040] like Figure 6As shown, the guide member 3 is provided with mounting holes 301, and the guide member 3 is fixed to the side plate 5 through the mounting holes 301. On the side of the guide member 3 opposite to the tripping rod 4, facing the tripping plate 1, a first transition edge 302, a separation edge 303, a second transition edge 304, a test edge 305, a third transition edge 306, and a tripping edge 307 are sequentially arranged. The separation edge 303 and the tripping edge 307 protrude towards the tripping rod 4. The first transition edge 302, the second transition edge 304, and the third transition edge 306 naturally slope and transition with the adjacent edges.

[0041] like Figure 7 As shown, the trip lever 4 is equipped with a rotating shaft 402. An operating end 401 is provided at one end of the trip lever 4 facing the trip plate 1. The operating end 401 is a protruding rod with a different rotation center than the rotating shaft 402. When the rotating shaft 402 rotates, the operating end 401 can swing with the rotating shaft 402. A tripping end 403 is provided at the other end of the trip lever 4, and the tripping end 403 rotates together with the rotating shaft 402. The trip lever 4 is rotatably installed inside the circuit breaker body 9 via the shaft 402, and the operating end 401 protrudes outside the circuit breaker body 9. When the operating end 401 is moved, the rotating shaft 402 moves accordingly, and the tripping end 403 is also driven to rotate.

[0042] like Figure 3 As shown, a guide mounting hole 503 is provided on the side plate 5 on the outer side of the drawer assembly 11 above the release lever 4, and the guide 3 is fixed to the side plate 5 through the guide mounting hole 503. A snap-on hole 507 is provided on the inner side of the drawer assembly 11 of the side plate 5, and the release plate 1 is rotatably mounted on the side plate 5 through the snap-on hole 507. The side plate 5 is also provided with a snap-on stop window 501 corresponding to the position of the stop section 106 of the release plate 1. The snap-on stop window 501 is provided with a lower stop edge 5011 and an upper stop edge 5012, and the stop section 106 can swing in the snap-on stop window 501. A drive hole 508 is provided on the side plate 5 below the snap-on hole 507, and the drive 2 is rotatably mounted on the side plate 5 through the drive hole 508.

[0043] like Figure 2As shown, the guide member 3 is fixed on the side plate 5. When the circuit breaker body 9 moves in the drawer device 11, the operating end 401 on the trip lever 4 on the circuit breaker body 9 is coupled to the guide member 3, thereby controlling the tripping, opening, locking, unlocking, and closing of the circuit breaker body 9. The trip plate 1 is rotatably mounted on the side plate 5. The stop section 106 of the trip plate 1 is placed in the stop window 501 of the stop plate. Under the force of the stop plate return spring 6, the trip plate 1 rotates and stops against the stop edge 5012 on the upper stop plate. The trip plate 1 can be pushed away from the upper stop edge 5012 of the stop plate and move closer to the lower stop edge 5011 of the stop plate by the drive member 2. The drive member 2 is rotatably mounted on the side plate 5. When the drive member 2 rotates, it can push the trip plate 1 to rotate.

[0044] like Figure 1 As shown, the circuit breaker body 9 is rotatably mounted with a trip lever 4. The trip end 403 on the trip lever 4 is located inside the circuit breaker body 9 and is coupled and linked with the mechanical system inside the circuit breaker body 9. The operating end 401 on the trip lever 4 is located on the outside of the circuit breaker body 9. During operation, when the operating end 401 is in the upper position by default, the circuit breaker body 9 is in the unlocked state and can be closed. When the operating end 401 is in the lower position, the circuit breaker body 9 is in the locked state. On the one hand, if the circuit breaker body 9 was originally in the closed state, the trip end 403 located inside the circuit breaker body 9 will trigger the mechanical system inside the circuit breaker body 9 to trip, causing the circuit breaker to open and preventing the circuit breaker body 9 from closing; on the other hand, if the circuit breaker body 9 was originally in the open state, the circuit breaker body 9 will remain open and cannot be closed. A body drive 10 is also fixed on the side of the circuit breaker body 9, and the body drive 10 is coupled to the body drive slot 205 in the drive component 2.

[0045] When the circuit breaker body 9 needs to be deployed into the drawer assembly 11, the drive member 2 uses its body drive groove 205 to drive the body drive sub-10 on the circuit breaker body 9 to move, causing the circuit breaker body 9 to move into the drawer assembly 11. Figure 8 As shown, during the movement of the circuit breaker body 9 into the drawer assembly 11, the operating end 401 is positioned at the top, the circuit breaker body 9 is in the unlocked state, and the operating end 401 first contacts the first transition edge 302 on the guide member 3. Under the push of the first transition edge 302, the operating end 401 rotates from top to bottom. Figure 9As shown, when the operating terminal 401 reaches the separation edge 303, the circuit breaker body 9 switches from the unlocked state to the locked state. The circuit breaker body 9 is tripped and in a non-closing state. The circuit breaker body 9 moves to the isolation position, and under the action of the separation edge 303, the circuit breaker body 9 cannot be closed. As the circuit breaker body 9 moves further into the drawer device 11, the operating terminal 401 transitions from the separation edge 303 to the second transition edge 304, and the circuit breaker body 9 gradually transitions from the locked state to the unlocked state. Figure 10 As shown, when the operating end 401 reaches the test side 305, the circuit breaker body 9 also reaches the test position simultaneously. At this time, the operating end 401 is at the top, the circuit breaker body 9 is in the unlocked state, and the circuit breaker body 9 can be closed. Before this, the driving component 2 and the trip plate 1 are not in contact. The stop section 106 on the trip plate 1 contacts and abuts the lower stop edge 5011 on the side plate 5 under the action of the plate return spring 6. As the circuit breaker body 9 moves further into the drawer device 11, the operating end 401 transitions from the test side 305 to the third transition side 306, and the circuit breaker body 9 gradually transitions from the unlocked state to the locked state. Figure 11 As shown, when the operating end 401 reaches the tripping edge 307, the circuit breaker body 9 is tripped and in a non-reclosable state. At this time, the first driving end 201 on the driving member 2 contacts the first mating section 101 on the tripping plate 1, pushing the tripping plate 1 to rotate. The stop section 106 on the tripping plate 1 gradually separates from the lower stop edge 5011 on the side plate 5, and the locking section 103 on the tripping plate 1 gradually approaches the operating end 401. Figure 12 As shown, as the circuit breaker body 9 moves further into the drawer assembly 11, the operating end 401 gradually moves away from the tripping edge 307, tending to transition back from the locked state to the unlocked state. At this time, the second driving end 202 on the driving member 2 contacts the first mating section 101 on the tripping plate 1, pushing the tripping plate 1 to rotate. This causes the locking section 103 of the tripping plate 1 to push the operating end 401 on the tripping lever 4 downwards, ultimately locking it at the bottom, preventing the circuit breaker body 9 from closing. Figure 13 As shown, as the circuit breaker body 9 moves further into the drawer assembly 11, it gradually reaches the connection position, reliably connecting to the drawer assembly 11. The second drive end 202 on the drive member 2 separates from the first mating section 101 on the trip plate 1, and the third drive end 203 on the drive member 2 contacts the second mating section 102 on the trip plate 1, pushing the trip plate 1 to rotate in the opposite direction. This causes the locking section 103 of the trip plate 1 to gradually separate from the operating end 401 on the trip lever 4, allowing the circuit breaker body 9 to close. The process of the circuit breaker body 9 exiting the drawer assembly 11 is the reverse of the above-described process and will not be repeated here.

[0046] Figure 15 ,16 17 is another embodiment of the tripping device for a drawer-type circuit breaker according to the present invention. The main difference is that, in order to further improve the reliability of the circuit breaker body 9 closing operation by separating the locking section 103 of the tripping plate 1 from the operating end 401 on the tripping rod 4 when the circuit breaker body 9 is in the connected position, a second auxiliary cooperating section 1022a is added to the tripping plate 1. During operation, as... Figure 16 As shown, firstly, the second driving end 202 on the driving member 2 contacts the second auxiliary cooperating section 1022a, and the third driving end 203 on the driving member 2 contacts the second cooperating section 1021a, thereby pushing the locking section 103 of the trip plate 1 to more reliably disengage from the operating end 401 on the trip lever 4. Then, the third driving end 203 on the driving member 2 contacts the second cooperating section 1021a and the second auxiliary cooperating section 1022a, realizing the reliable separation of the operating end 401 on the trip lever 4 from the locking section 103 of the trip plate 1, allowing the circuit breaker body 9 to close.

[0047] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any form or substance. It should be noted that those skilled in the art can make various improvements and additions without departing from the present invention, and these improvements and additions should also be considered within the scope of protection of the present invention. Any modifications, alterations, and equivalent changes made by those skilled in the art based on the above-disclosed technical content without departing from the spirit and scope of the present invention are equivalent embodiments of the present invention. Furthermore, any modifications, alterations, and evolutions made to the above embodiments based on the essential technology of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A tripping device for a drawer-type circuit breaker, comprising a circuit breaker body (9), a drawer assembly (11), a tripping plate (1), a driving component (2), a guide component (3), a tripping rod (4), a side plate (5), and a plate reset spring (6); The trip lever (4) is rotatably mounted on the circuit breaker body (9); The circuit breaker body (9) enters or exits the drawer device (11) under the drive of the drive unit (2); The relative positions of the circuit breaker body (9) and the drawer device (11) include: In the isolated position, the circuit breaker body (9) cannot be closed; In the test position, the circuit breaker body (9) can be closed; With the connection position unlocked, the circuit breaker body (9) can be closed; Its features are, During the process of the circuit breaker body (9) entering the connection position, the trip plate (1) drives the circuit breaker body (9) to trip, so that the circuit breaker body (9) cannot be closed; then the trip plate (1) unlocks, so that the circuit breaker body (9) can be closed.

2. The tripping device for a drawer-type circuit breaker according to claim 1, characterized in that, The release plate (1) is provided with a release plate shaft hole (105), and the release plate (1) is rotatably mounted on the side plate (5) through the release plate shaft hole (105); The trip plate (1) is provided with a locking section (103) facing the trip rod (4) on the circuit breaker body (9); The trip plate (1) is provided with a first mating section (101) and a second mating section (102) in sequence facing the drive member (2); The trip plate (1) is bent toward the side plate (5) to form a stop section (106); The trip plate (1) is also provided with a reset hole (107) for installing the trip plate reset spring (6).

3. The tripping device for a drawer-type circuit breaker according to claim 1, characterized in that, The drive member (2) is provided with a drive shaft hole (204), and the drive member (2) is rotatably mounted on the side plate (5) through the drive shaft hole (204); The drive unit (2) is arranged with a first drive end (201), a second drive end (202), and a third drive end (203) in sequence toward the trip plate (1), and the first drive end (201), the second drive end (202), and the third drive end (203) are smoothly transitioned together.

4. The tripping device for a drawer-type circuit breaker according to claim 1, characterized in that, The trip lever (4) is provided with a pivot (402); The tripping lever (4) has an operating end (401) at one end facing the tripping plate (1). The operating end (401) is a protruding rod with a different rotation center from the rotating shaft (402). When the rotating shaft (402) rotates, the operating end (401) can swing with the rotating shaft (402). The other end of the tripping lever (4) is provided with a tripping end (403), which rotates together with the rotating shaft (402); The trip lever (4) is rotatably installed inside the circuit breaker body (9) via a shaft (402). The operating end (401) protrudes outside the circuit breaker body (9). When the operating end (401) is moved, it moves along the shaft (402), and the trip end (403) is also driven to rotate.

5. The tripping device for a drawer-type circuit breaker according to claim 1, characterized in that, The guide member (3) is provided with mounting holes (301), and the guide member (3) is fixed to the side plate (5) through the mounting holes (301); The guide member (3) is provided with a first transition edge (302), a separation edge (303), a second transition edge (304), a test edge (305), a third transition edge (306), and a tripping edge (307) on the side opposite to the tripping rod (4) facing the tripping plate (1); The separating edge (303) and the tripping edge (307) protrude toward the tripping lever (4); The first transition edge (302), the second transition edge (304) and the third transition edge (306) naturally slope and transition with the adjacent edge.

6. The tripping device for a drawer-type circuit breaker according to claim 1, characterized in that, The side plate (5) is provided with a guide mounting hole (503) on the outside of the drawer device (11) above the release lever (4), and the guide (3) is fixed on the side plate (5) through the guide mounting hole (503); The side panel (5) has a snap-on hole (507) inside the drawer device (11), and the release plate (1) is rotatably mounted on the side panel (5) through the snap-on hole (507). The side plate (5) is also provided with a buckle stop window (501) corresponding to the position of the stop section (106) of the buckle plate (1). The buckle stop window (501) is provided with a lower buckle stop edge (5011) and an upper buckle stop edge (5012). The stop section (106) can swing in the buckle stop window (501). The side plate (5) is provided with a drive hole (508) below the buckle hole (507), and the drive member (2) is rotatably mounted on the side plate (5) through the drive hole (508).

7. A tripping device for a drawer-type circuit breaker according to claim 3, characterized in that, During the rotation of the drive member (2), the first drive end (201) can push the trip plate (1) to rotate, so that the locking section (103) of the trip plate (1) moves closer to the operating end (401) on the trip rod (4); During the rotation of the drive unit (2), the second drive end (202) can push the trip plate (1) to rotate, so that the locking section (103) of the trip plate (1) locks the operating end (401) on the trip rod (4), preventing the circuit breaker body (9) from closing. During the rotation of the drive unit (2), the third drive end (203) can push the trip plate (1) to rotate, so that the locking section (103) of the trip plate (1) leaves the operating end (401) on the trip rod (4), allowing the circuit breaker body (9) to be closed.

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