Tripping device and circuit breaker

Abstract

The utility model discloses a tripping device and a circuit breaker, and relates to the low-voltage electrical technical field. The tripping device comprises a driving piece, a tripping part, an armature and a lock catch, the tripping part is located between the driving piece and the armature, one end of the tripping part can abut against the driving piece, and the other end of the tripping part can abut against the armature; the armature can abut against the lock catch. And the driving piece is driven to drive the armature to axially rotate through the tripping part, and the armature drives the lock catch to unlock, so that the circuit breaker is opened. According to the tripping device, force transmission is achieved through the driven movement of the tripping part located between the driving piece and the armature, then unlocking of the lock catch is achieved, tripping can still be achieved through electric operation even if the inner handle is clamped, and tripping reliability and safety are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to low pressure electrical technology field, specifically, relate to a trip device and circuit breaker. BACKGROUND

[0002] The circuit breaker is as the core part of circuit protection, and the reliability of its trip device directly determines the realization effect of emergency opening function. The traditional trip device generally adopts the double operation mode of manual operation and electric opening.

[0003] The electric opening process of the existing circuit breaker is usually through the motor drive gear assembly, drives the trip lever to drive the inner handle, and then triggers the internal trip mechanism to realize the opening. However, when the circuit breaker is continuously pressed after closing, the inner handle cannot be driven by the trip lever due to mechanical jamming, resulting in opening failure, thereby reducing the opening reliability of the circuit breaker, and in the emergency situation, it may cause safety accidents due to the failure to cut off the circuit in time. SUMMARY

[0004] The utility model aims at providing a trip device and circuit breaker, which can avoid the problem of unable to electrically operate to realize tripping when the inner handle is jammed, and improve the tripping reliability and safety of the circuit breaker.

[0005] The embodiment of the utility model is realized as follows:

[0006] In one aspect of the utility model, a trip device is provided, which comprises a driving member, a trip part, an armature and a lock catch. The trip part is located between the driving member and the armature, and one end of the trip part can abut against the driving member, and the other end can abut against the armature. The armature can abut against the lock catch. The driving member is driven to drive the armature to rotate axially through the trip part, and the armature drives the lock catch to unlock, so as to open the circuit breaker.

[0007] Optionally, the trip part comprises a first trip lever and a second trip lever. The first trip lever has a first abutting part and a first pushing part, and the first abutting part is used for abutting against the driving member. The second trip lever has a second abutting part and a second pushing part, and the second pushing part is used for abutting against the armature. The driving member is driven to drive the first pushing part to move towards the second abutting part through the first abutting part. The first pushing part can abut against the second abutting part and push the second trip lever to move, so that the second pushing part drives the armature to rotate axially.

[0008] Optionally, the trip part comprises a first trip lever, the first trip lever has a first abutting part and a first pushing part, the first abutting part is used for abutting against the driving member, and the first pushing part is used for abutting against the armature. The driving member is driven to drive the first pushing part to move towards the armature through the first abutting part and abut against the armature, so as to drive the armature to rotate axially.

[0009] Optionally, the first trip lever has a first mounting plate with a through hole for passing a rotating shaft, so that the first trip lever is rotatably arranged on the base of the circuit breaker.

[0010] Optionally, the second trip lever has a second mounting plate with a through hole for passing a rotating shaft, so that the second trip lever is rotatably arranged on the base of the circuit breaker.

[0011] Optionally, an end of the first trip lever towards the second trip lever is provided with a push plate extending towards the second abutting portion to form a first push portion.

[0012] Optionally, an end of the first trip lever close to the first abutting portion is provided with a rotating member with a through hole for passing a rotating shaft, so that the first trip lever is rotatably arranged on the base of the circuit breaker.

[0013] Optionally, the armature has a trip boss corresponding to the locking position, and the trip portion is capable of abutting against the trip boss to drive the armature to rotate axially, and the armature is capable of driving the locking to be unlocked through the trip boss.

[0014] Optionally, the driving member comprises a transmission gear with an abutting boss, and a side wall of the abutting boss has a driving surface, and the transmission gear rotating along the axial direction is capable of making the driving surface abut against the first abutting portion of the first trip lever.

[0015] In another aspect of the utility model, a circuit breaker is provided, which comprises a shell, a contact system and a trip device; the contact system and the trip device are arranged in the shell; the circuit breaker further comprises a button arranged on the shell and an inner handle and a trip catch arranged in the shell; the trip catch can be latched or separated with the locking to be unlocked; the inner handle is located between the driving member and the locking, and is in transmission connection with the button and the trip catch respectively; the button can be driven to rotate the inner handle, so that the contact system is opened or closed.

[0016] The utility model has the advantages of:

[0017] The application provides a trip device, which comprises a driving member, a trip portion, an armature and a locking; the trip portion is located between the driving member and the armature, and one end of the trip portion can abut against the driving member, and the other end can abut against the armature; the armature can abut against the locking; the driving member is driven to rotate the armature axially through the trip portion, and the armature drives the locking to be unlocked, so that the circuit breaker is opened. Compared with the prior art, the driving movement of the trip portion located between the driving member and the armature realizes force transmission, and then the locking is unlocked, so that the trip can be realized through electric operation even if the inner handle is stuck, and the trip reliability and safety are improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the drawings used in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. Other related drawings can also be obtained by those skilled in the art without creative labor on the premise of not paying creative labor.

[0019] Figure 1 Structure diagram of the tripping device of the circuit breaker provided by the embodiments of the present application;

[0020] Figure 2 One of the enlarged detail views of A;

[0021] Figure 3 The second enlarged detail view of A;

[0022] Figure 4 Structure diagram of the tripping device of the circuit breaker provided by the embodiments of the present application;

[0023] Figure 5 One of the enlarged detail views of B;

[0024] Figure 6 The second enlarged detail view of B;

[0025] Figure 7 Structure diagram of the tripping device of the circuit breaker provided by the embodiments of the present application;

[0026] Figure 8 The enlarged detail view of C;

[0027] Figure 9 Structure diagram of the tripping device of the circuit breaker provided by the embodiments of the present application;

[0028] Figure 10 The enlarged detail view of D.

[0029] Icon: 110 - driving member; 111 - transmission gear; 1111 - abutting boss; 120 - armature; 121 - tripping boss; 130 - tripping part; 131 - first tripping rod; 1311 - first abutting part; 1312 - first pushing part; 1312a - pushing plate; 1313 - first mounting plate; 1314 - rotating member; 132 - second tripping rod; 1321 - second abutting part; 1322 - second pushing part; 1323 - second mounting plate; 140 - lock catch; 141 - jump catch; 150 - rotating shaft; 200 - circuit breaker; 201 - shell; 210 - button; 220 - inner handle; 230 - connecting rod; a - length direction. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model below. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. The components of the embodiments of the utility model described and shown in the drawings can be arranged and designed in various different configurations.

[0031] In the description of the utility model, it needs to be explained that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right" and the like is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship commonly placed when the utility model product is used, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, so it cannot be understood as a limitation on the utility model.

[0032] In the description of the utility model, it also needs to be explained that, unless otherwise explicitly specified and limited, the terms "set", "mount", "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the communication inside two elements. For ordinary skilled persons in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0033] Please refer to Figure 1 , Figure 7 and Figure 9 , the present embodiment provides a tripping device, including driving piece 110, tripping part 130, armature 120 and lock 140, tripping part 130 is located between driving piece 110 and armature 120, and one end of tripping part 130 can abut with driving piece 110, the other end can abut with armature 120;Armature 120 can abut with lock 140;Driving piece 110 is driven to drive armature 120 to rotate axially through tripping part 130, armature 120 drives lock 140 to unlock, so that circuit breaker 200 is opened.

[0034] Specifically, as Figure 1 Indicated, the tripping device of the application includes driving piece 110, tripping part 130, armature 120 and lock 140, wherein tripping part 130, driving piece 110 and armature 120 are arranged along the length direction a of the shell 201 of the circuit breaker 200, tripping part 130 is arranged between driving piece 110 and armature 120, so as to construct the power transmission path, transmit the power generated by driving piece 110 to tripping part 130, and then transmit the power to armature 120 by tripping part 130.

[0035] The armature 120 is rotatably arranged on the base of the circuit breaker 200, and as the armature 120 rotates, the part of the armature 120 in contact with the latch 140 applies force to the latch 140, promoting the rotation of the latch 140. One side of the latch 140 is locked with the trip dog 141, at which time the movable contact and the static contact are in contact, and the circuit breaker 200 is closed; when the armature 120 drives the latch 140 to rotate relative to the trip dog 141, the latch 140 is separated from the trip dog 141, at which time the latch 140 is unlocked, and the movable contact and the static contact are separated, and the circuit breaker 200 is opened.

[0036] It should be noted that in an embodiment of the present application, first, as shown in Figure 1 and Figure 4 The driving member 110 includes a transmission gear 111, and the transmission gear 111 has an abutting boss 1111, and the side wall of the abutting boss 1111 has a driving surface.

[0037] Specifically, the driving member 110 includes a transmission gear 111, and the number of the transmission gear 111 is at least one; as shown in Figure 4 When the number of the transmission gear 111 is multiple, the multiple transmission gears 111 are sequentially engaged to achieve force transmission. One of the transmission gears 111 is in transmission connection with the output shaft of the motor in the circuit breaker 200, and the rotation of the transmission gear 111 can be sequentially driven by the motor, thereby achieving force transmission. Optionally, the type of the transmission gear 111 can be a straight gear, a helical gear, etc., which can be selected according to the specific requirements of the trip device, and the present application does not make any limitation on the specific form of the transmission gear 111.

[0038] As shown in Figure 4 The transmission gear 111 capable of abutting against the tripping part 130 has an abutting boss 1111, and in order not to interfere with the engagement between the transmission gears 111, the abutting boss 1111 is preferably arranged at the middle part of the transmission gear 111 along the rotation axis of the transmission gear 111, and the side of the tripping part 130 close to the driving member 110 is located on the rotation path of the abutting boss 1111; when the transmission gear 111 is driven to rotate, the abutting boss 1111 rotates together with the transmission gear 111 until it abuts against the tripping part 130 and applies force to the tripping part 130, thereby driving the tripping part 130 to move; the tripping part 130 can transmit the force from the armature 120 to the latch 140, thereby achieving the unlocking of the latch 140.

[0039] The side wall of the abutting boss 1111 has a driving surface, which is preferably an arc surface. The arc surface design allows the abutting boss 1111 to better fit the tripping part 130 during movement, reduces the concentration of contact stress, and also makes the transmission more stable, improving the reliability and operating efficiency of the tripping device. Moreover, since the transmission gear 111 is in axial rotation mode, the arc surface is also more suitable for axial rotation transmission mode.

[0040] Secondly, as shown in Figure 6 and Figure 8 , the armature 120 has a tripping boss 121 corresponding to the position of the lock catch 140, and the tripping part 130 can abut against the tripping boss 121 to drive the armature 120 to rotate axially; the armature 120 can drive the lock catch 140 to be unlocked through the tripping boss 121.

[0041] Specifically, as shown in Figure 6 and Figure 8 , the tripping boss 121 is protruded on the armature 120, which can be in block shape, columnar shape, etc. Among them, the block-shaped tripping boss 121 has a larger contact area, which can more evenly transmit force when in contact with the lock catch 140; the columnar tripping boss 121 can improve the compactness of the space layout, and can more accurately act on the lock catch 140.

[0042] One side of the tripping boss 121 corresponds to the position of the lock catch 140, and the other side corresponds to the position of the tripping part 130, so that the tripping part 130 can transmit force to the lock catch 140 through the tripping boss 121, ensuring that the tripping boss 121 can accurately contact and act on the lock catch 140 during the movement of the armature 120.

[0043] Compared with the existing technology which realizes the opening of the switch through the inner handle, the present application realizes the transmission of force through the driven movement of the tripping part 130 between the driving part 110 and the armature 120, and then realizes the unlocking of the lock catch 140, so that even if the inner handle 220 is stuck, the tripping can still be realized through electric operation, improving the tripping reliability and safety.

[0044] In an implementable manner of the present application, please refer to Figures 1 to 6The tripping part 130 comprises a first tripping rod 131 and a second tripping rod 132. The first tripping rod 131 has a first abutting part 1311 for abutting against the driving part 110 and a first pushing part 1312. The second tripping rod 132 has a second abutting part 1321 and a second pushing part 1322 for abutting against the armature 120. The driving part 110 is driven to move the first pushing part 1312 towards the second abutting part 1321. The first pushing part 1312 can abut against the second abutting part 1321 and push the second tripping rod 132 to move, so that the second pushing part 1322 drives the armature 120 to rotate axially.

[0045] Specifically, as shown in Figure 2 The tripping part 130 comprises a first tripping rod 131 and a second tripping rod 132. The first tripping rod 131 and the second tripping rod 132 cooperate with each other to gradually transmit the power generated by the driving part 110 to the armature 120, so as to finally realize the opening operation of the circuit breaker 200.

[0046] In order to match the layout inside the housing 201 of the circuit breaker 200, the first tripping rod 131 and the second tripping rod 132 can be bent according to the setting positions of other components. As shown in Figure 2 The first tripping rod 131 has a first abutting part 1311 at one end and a first pushing part 1312 at the other end. In an embodiment of the present application, the first tripping rod 131 has a first mounting plate 1313 with a through hole for passing the rotating shaft 150, so that the first tripping rod 131 is rotatably arranged on the base of the circuit breaker 200. Similarly, as shown in Figure 3 The second tripping rod 132 has a second mounting plate 1323 with a through hole for passing the rotating shaft 150, so that the second tripping rod 132 is rotatably arranged on the base of the circuit breaker 200.

[0047] The first abutting part 1311 is a connecting point between the first tripping rod 131 and the driving part 110, and is used to receive the power of the driving part 110. For example, when the driving part 110 is a motor-driven transmission gear 111, the abutting boss 1111 on the transmission gear 111 will contact the first abutting part 1311 and apply force during rotation.

[0048] It should be noted that the first abutting part 1311 can be a planar structure to form a larger contact area with the abutting boss 1111 of the driving part 110, thereby improving the efficiency of force transmission; or it can be a groove structure to cooperate with the structure of the abutting boss 1111 to prevent misalignment during force transmission.

[0049] The position of the first pushing part 1312 on the first tripping lever 131 is opposite to the first abutting part 1311. When the first abutting part 1311 is subjected to the force of the driving part 110, the first tripping lever 131 rotates around the rotating shaft 150 and drives the first pushing part 1312 to move towards the second tripping lever 132, so as to transmit the force to the second tripping lever 132 through the first pushing part 1312.

[0050] Similarly, one end of the second tripping lever 132 is the second abutting part 1321 for receiving the force transmitted by the first tripping lever 131, and the other end is the second pushing part 1322 for transmitting the force to the armature 120. The second abutting part 1321 can effectively cooperate with the first pushing part 1312 of the first tripping lever 131. When the first pushing part 1312 moves towards the second tripping lever 132 under the action of the driving part 110, the second abutting part 1321 contacts the first pushing part 1312 and receives the force transmitted thereby.

[0051] Please refer to Figure 2 , Figure 3 , Figure 5 and Figure 6 , when the second tripping lever 132 moves under the pushing of the first tripping lever 131, the second tripping lever 132 can rotate around the rotating shaft 150 and drive the second pushing part 1322 to move, so as to contact the tripping boss 121 on the armature 120 and apply force, thereby driving the armature 120 to rotate around its axis. Among them, Figure 2 and Figure 3 are structural schematic views of the first tripping lever 131 and the second tripping lever 132 when the circuit breaker 200 is closed; Figure 5 and Figure 6 are structural schematic views of the first tripping lever 131 and the second tripping lever 132 when the circuit breaker 200 is opened.

[0052] Optionally, as shown in Figure 2 , the end of the first tripping lever 131 towards the second tripping lever 132 is provided with a pushing plate 1312a which extends towards the second abutting part 1321 to form the first pushing part 1312. Of course, in addition to the pushing plate 1312a, the first pushing part 1312 can also have other structural forms, such as a bent part, and the specific shape and structure thereof can be adjusted according to the spatial layout in the housing 201 of the circuit breaker 200 and the relative positions of the first tripping lever 131 and the second tripping lever 132, and the present application does not make any limitation in this regard.

[0053] In another implementation manner of the present application, as shown in Figure 7 and Figure 9As shown, the tripping part 130 comprises a first tripping rod 131, the first tripping rod 131 has a first abutting part 1311 for abutting with the driving piece 110 and a first pushing part 1312 for abutting with the armature 120; the driving piece 110 is driven to move the first pushing part 1312 towards the armature 120 through the first abutting part 1311 and abut with the armature 120, so as to drive the armature 120 to rotate axially.

[0054] Specifically, in addition to the embodiment of arranging two tripping rods, as shown in Figure 7 and Figure 9 the tripping part 130 can also be arranged with only one first tripping rod 131, the opposite ends of the first tripping rod 131 can respectively abut with the driving piece 110 and the armature 120, and the driving piece 110 can directly transmit force to the armature 120 through the first tripping rod 131.

[0055] In order to match the layout inside the housing 201 of the circuit breaker 200, the first tripping rod 131 can be bent according to the arrangement position of other components and arranged on the base of the circuit breaker 200 in a rotating manner.

[0056] In a specific embodiment of the present application, as shown in Figure 7 and Figure 8 the first tripping rod 131 has a first mounting plate 1313, a through hole is arranged on the first mounting plate 1313, the through hole is used for penetrating the rotating shaft 150, so that the first tripping rod 131 is arranged on the base of the circuit breaker 200 in a rotatable manner, and the first tripping rod 131 can rotate around the rotating shaft 150 as the rotation axis;

[0057] In another specific embodiment of the present application, as shown in Figure 9 and Figure 10 the first tripping rod 131 is sleeved with a rotating piece 1314 at one end close to the first abutting part 1311, the rotating piece 1314 is arranged with a through hole, the through hole is used for penetrating the rotating shaft 150, so that the first tripping rod 131 is arranged on the base of the circuit breaker 200 in a rotatable manner. Optionally, the rotating piece 1314 is arranged on the top of the housing 201 of the circuit breaker 200, which is more space-saving and improves the space utilization.

[0058] As shown in Figure 8 and Figure 10As shown, the first tripping lever 131 has a first abutting portion 1311 and a first pushing portion 1312, the first abutting portion 1311 is used to contact the driving member 110, it is to be noted that the first abutting portion 1311 can be a flat structure, so as to form a larger contact area with the abutting boss 1111 of the driving member 110, and improve the efficiency of force transmission; or can be a groove structure, so as to cooperate with the structure of the abutting boss 1111, and prevent dislocation during force transmission.

[0059] The first pushing portion 1312 is used to contact and push the armature 120 to move, in order to smoothly push the armature 120 to rotate, preferably, the first pushing portion 1312 is a curved surface or a flat surface with a certain inclination angle, so as to better transmit the force to the armature 120 when contacting the armature 120.

[0060] When the driving member 110 is driven to transmit the force to the first tripping lever 131 through the first abutting portion 1311, the first tripping lever 131 rotates, and the first pushing portion 1312 moves towards the armature 120 along with the movement of the first tripping lever 131. When the first pushing portion 1312 abuts against the armature 120, an acting force is applied to the armature 120, so as to drive the armature 120 to rotate around its axis. The rotation of the armature 120 further drives the components such as the lock catch 140 connected thereto to move, and finally realizes the opening operation of the circuit breaker 200.

[0061] Another aspect of the embodiment of the present application also provides a circuit breaker 200, which comprises a housing 201, a contact system and a tripping device; the contact system and the tripping device are arranged in the housing 201; the circuit breaker 200 further comprises a button 210 arranged on the housing 201, and an inner handle 220 and a jump catch 141 arranged in the housing 201, the jump catch 141 can be lapped with the lock catch 140 to be locked or separated to be unlocked, the inner handle 220 is located between the driving member 110 and the lock catch 140, and is in transmission connection with the button 210 and the jump catch 141 respectively, as shown in the figure. Figure 1 As shown, the button 210 and the inner handle 220 are in transmission connection through a connecting rod 230, and the inner handle 220 and the jump catch 141 are in transmission connection through the connecting rod 230; the button 210 can be driven to rotate the inner handle 220, so as to open or close the contact system. The specific structure and beneficial effects of the tripping device have been described in detail above, and will not be repeated here.

[0062] The circuit breaker 200 described above can realize tripping through electric operation when the inner handle 220 is stuck, improves the tripping reliability and the use safety of the circuit breaker 200 through the arrangement of the tripping device.

[0063] The above merely describes optional embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

[0064] In addition, it should be noted that various specific technical features described in the foregoing embodiments can be combined in any suitable manner without contradiction, and to avoid unnecessary repetition, the present application will not describe various possible combinations again.

Claims

1. A tripping device, characterized in that, The circuit breaker includes a drive member (110), a trip unit (130), an armature (120), and a latch (140). The trip unit (130) is located between the drive member (110) and the armature (120), and one end of the trip unit (130) can abut against the drive member (110) and the other end can abut against the armature (120). The armature (120) can abut against the latch (140). The drive member (110) is driven to rotate the armature (120) axially through the trip unit (130), and the armature (120) drives the latch (140) to unlock, so that the circuit breaker (200) is tripped.

2. The tripping device according to claim 1, characterized in that, The tripping part (130) includes a first tripping rod (131) and a second tripping rod (132); the first tripping rod (131) has a first abutting part (1311) and a first pushing part (1312), the first abutting part (1311) is used to abut against the driving member (110); the second tripping rod (132) has a second abutting part (1321) and a second pushing part (1322), the second pushing part (1322) is used to abut against the armature (120); the driving member (110) is driven to move the first pushing part (1312) toward the second abutting part (1321) through the first abutting part (1311); the first pushing part (1312) can abut against the second abutting part (1321) and push the second tripping rod (132) to move, so that the second pushing part (1322) drives the armature (120) to rotate axially.

3. The tripping device according to claim 1, characterized in that, The tripping part (130) includes a first tripping rod (131), which has a first abutting part (1311) and a first pushing part (1312). The first abutting part (1311) is used to abut against the driving member (110), and the first pushing part (1312) is used to abut against the armature (120). The driving member (110) is driven to move the first pushing part (1312) toward the armature (120) and abut against the armature (120) through the first abutting part (1311) to drive the armature (120) to rotate axially.

4. The tripping device according to claim 2 or 3, characterized in that, The first trip lever (131) has a first mounting plate (1313) with a through hole for a rotating shaft (150) to pass through, so that the first trip lever (131) is rotatably mounted on the base of the circuit breaker (200).

5. The tripping device according to claim 2, characterized in that, The second trip lever (132) has a second mounting plate (1323) with a through hole for a rotating shaft (150) to pass through, so that the second trip lever (132) is rotatably mounted on the base of the circuit breaker (200).

6. The tripping device according to claim 2, characterized in that, The first trip lever (131) has a push plate (1312a) protruding from one end toward the second trip lever (132), and the push plate (1312a) extends toward the second abutment (1321) to form the first push portion (1312).

7. The tripping device according to claim 3, characterized in that, A rotating member (1314) is sleeved on one end of the first tripping rod (1311) near the first abutment part (1311). The rotating member (1314) has a through hole for a rotating shaft (150) to pass through, so that the first tripping rod (131) can be rotatably mounted on the base of the circuit breaker (200).

8. The tripping device according to claim 1, characterized in that, The armature (120) has a release boss (121) corresponding to the position of the latch (140), and the release part (130) can abut against the release boss (121) to drive the armature (120) to rotate axially; the armature (120) can drive the latch (140) to unlock through the release boss (121).

9. The tripping device according to claim 2 or 3, characterized in that, The drive member (110) includes a transmission gear (111), the transmission gear (111) has an abutment boss (1111), the side wall of the abutment boss (1111) has a drive surface, and the transmission gear (111) can rotate axially to make the drive surface abut against the first abutment portion (1311) of the first trip lever (131).

10. A circuit breaker, characterized in that, The circuit breaker (200) includes a housing (201), a contact system, and a tripping device as described in any one of claims 1-9; the contact system and the tripping device are disposed within the housing (201); the circuit breaker (200) further includes a button (210) disposed on the housing (201) and an inner handle (220) and a trip latch (141) disposed within the housing (201), the trip latch (141) being able to engage and lock or disengage and unlock with the latch (140), the inner handle (220) being located between the drive member (110) and the latch (140), and being pulsatorically connected to the button (210) and the trip latch (141) respectively; the button (210) can be driven to rotate the inner handle (220) to open and close the contact system.

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