CN221057343U - Tripping device and circuit breaker - Google Patents

Abstract

The application provides a tripping device and a circuit breaker, and relates to the technical field of piezoelectric devices. The trip box assembly and the contact assembly are matched for transmission, when faults occur, the current in the loop is instantaneously increased, and then the electromagnetic assembly connected into the conductive loop responds, so that the trip box assembly is driven to conduct linear motion, the trip box assembly is separated from the contact assembly, the trip box assembly and the contact assembly are released from being matched for transmission, and the contact assembly is conveniently switched from a closing state to a breaking state smoothly, and the breaking of the conductive loop is completed. In the process, the matching relation between the electromagnetic assembly and the tripping box assembly is linear driving, so that the driving matching form of the electromagnetic assembly and the tripping box assembly is simpler, the complexity of the tripping device is reduced, and the accuracy and timeliness of fault tripping are improved.

Description

Tripping device and circuit breaker

Technical Field

The application relates to the technical field of piezoelectric devices, in particular to a tripping device and a circuit breaker.

Background

With the rapid development of economy, the living standard of people is rapidly improved, and higher requirements are placed on electricity safety. The circuit breaker may be mounted to a terminal distribution line. Meanwhile, the circuit can also be used for switching on, carrying and breaking current under normal or abnormal circuit conditions, so that effective protection is formed for circuits and electrical equipment.

In the existing circuit breaker, the tripping piece belongs to a ring in a driving link for driving the contact assembly to close or open, so that in order to realize fault tripping of the circuit breaker, an electromagnetic assembly is further arranged in the circuit breaker, so that when the circuit breaker breaks down, the tripping piece is driven to move by the electromagnetic assembly, and the driving link is damaged to enable the contact assembly to open smoothly. Because the driving forms of the electromagnetic assembly and the tripping element are complex, the matching difficulty of the electromagnetic assembly and the tripping element is high, and the problem of unreliable brake separation easily occurs.

Disclosure of utility model

The present application aims to provide a trip device and a circuit breaker, which address the above-described shortcomings of the prior art.

In order to achieve the above purpose, the technical scheme adopted by the embodiment of the application is as follows:

In one aspect of the embodiment of the application, a trip device is provided, which comprises an electromagnetic component and a trip box component in driving connection with the electromagnetic component, wherein the electromagnetic component is used for being connected with a conductive loop with a contact component, the trip box component and the contact component are in matched transmission, and the electromagnetic component is used for driving the trip box component to move linearly so as to enable the contact component to be switched from a switching-on state to a switching-off state.

Optionally, the trip device further includes a driving part, a driving part is disposed on the trip box assembly, the electromagnetic assembly is in driving connection with the driving part of the trip box assembly through the driving part, and the electromagnetic assembly is used for driving the driving part to move towards the trip direction so as to drive the trip box assembly to move linearly.

Optionally, a sliding groove is formed in the trip box assembly, the driving part is located at one end of the sliding groove, one end of the driving part is slidably connected with the sliding groove along the extending direction of the sliding groove and is in driving fit with the driving part, and the sliding stroke of the driving part is smaller than the extending length of the sliding groove.

Optionally, the electromagnetic assembly includes first elastic component, iron core subassembly and around locating the coil of iron core subassembly periphery, and the coil is connected with conductive loop, and the iron core subassembly includes mutually supporting quiet iron core and moves the iron core, moves the iron core and is connected with the driving piece drive, and first elastic component is used for providing the restoring force to moving the iron core.

Optionally, the trip box assembly and the contact assembly are distributed in an L shape, and the electromagnetic assembly is located on the inner side of the L shape.

Optionally, the trip device further includes a second elastic member connected to the trip box assembly and sleeved on the periphery of the driving member, where the second elastic member is used to provide a restoring force to the trip box assembly.

Optionally, the tripping device further comprises an overload release electrically connected with the conductive loop, the overload release is in driving connection with the driving piece, and the overload release is used for driving the driving piece to drive the tripping box assembly to linearly move so as to enable the contact assembly to be switched from the switching-on state to the switching-off state.

Optionally, the overload release includes a bimetal electrically connected to the conductive loop, the bimetal being drivingly connected to the driving member.

Optionally, the overload release includes a transmission assembly and a bimetal electrically connected to the conductive loop, and the bimetal is in driving connection with the driving member via the transmission assembly.

Optionally, the trip box subassembly includes the trip box and slides the trip piece that sets up in the trip box, electromagnetic assembly and trip box drive connection, the trip piece is through linkage piece and contact subassembly drive cooperation, the relative trip box of trip piece driven slides in order to drive the contact subassembly by the separating brake state through the linkage piece and switch on the state, electromagnetic assembly drive trip box linear motion, in order to drive trip piece and contact subassembly release drive cooperation, make the contact subassembly switch on to the separating brake state from the closing state, the direction of motion of linkage piece is perpendicular with the direction of motion of trip box.

In another aspect of the embodiments of the present application, a circuit breaker is provided, including a housing, a contact assembly disposed in the housing, and a trip device of any one of the above, wherein a trip box assembly of the trip device is in transmission with the contact assembly.

The beneficial effects of the application include:

The application provides a tripping device and a circuit breaker, which comprise an electromagnetic component and a tripping box component in driving connection with the electromagnetic component, wherein the electromagnetic component is used for being connected into a conductive loop with a contact component so as to facilitate timely response of the electromagnetic component when the conductive loop fails. The tripping box assembly and the contact assembly are matched for transmission, namely, under the normal working state without faults, the external force drives the tripping box assembly to drive the contact assembly to switch from the opening state to the closing state, and at the moment, the conductive loop is normally connected. When a fault occurs, the current in the loop is instantaneously increased, and then the electromagnetic component connected into the conductive loop responds, so that the tripping box component is driven to conduct linear motion, the tripping box component is separated from the contact component, the transmission fit of the tripping box component and the contact component is released, the contact component is conveniently switched from a closing state to a separating state, and the separation of the conductive loop is completed. In the process, the matching relation between the electromagnetic assembly and the tripping box assembly is linear driving, so that the driving matching form of the electromagnetic assembly and the tripping box assembly is simpler, the complexity of the tripping device is reduced, and the accuracy and timeliness of fault tripping are improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic diagram of the cooperation of a trip device and a contact assembly according to an embodiment of the present application;

FIG. 2 is a second schematic diagram illustrating the mating of a trip device and a contact assembly according to an embodiment of the present application;

Fig. 3 is a schematic structural diagram of a circuit breaker according to an embodiment of the present application;

Fig. 4 is a second schematic structural diagram of a circuit breaker according to an embodiment of the present application.

Icon: 110-trip box assembly; 111-a chute; 112-a driving part; 113-a trip box; 114-release fastener; 120-a second elastic member; 130-a driving member; 140-coil; 150-an iron core assembly; 160-an electromagnetic assembly; 170-a moving contact; 180-stationary contact; 190-contact assembly; 210-bimetal; 220-a second pushrod; 230-a third elastic member; 240-a transmission assembly; 241-first link; 242-fourth elastic members; 243-fifth elastic members; 250-magnetic holding means; 251-first push rod; 300-circuit breaker; 310-housing.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. The components of the embodiments of the present application generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the application, as presented in the figures, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. It should be noted that, under the condition of no conflict, the features of the embodiments of the present application may be combined with each other, and the combined embodiments still fall within the protection scope of the present application.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the present application, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or those that are conventionally put in use of the product of the application, are merely for convenience of describing the present application and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific direction, be configured and operated in a specific direction, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal," "vertical," and the like do not denote a requirement that the component be absolutely horizontal or overhang, but rather may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present application, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.

In one aspect of the embodiment of the present application, as shown in fig. 1, a trip device is provided, which includes an electromagnetic assembly 160 and a trip box assembly 110, wherein the electromagnetic assembly 160 is in driving connection with the trip box assembly 110, and the electromagnetic assembly 160 can be connected to a conductive loop with a contact assembly 190, so as to facilitate timely response of the electromagnetic assembly 160 when the conductive loop fails. The trip box assembly 110 and the contact assembly 190 cooperate to drive, that is, in a normal working state without faults, the trip box assembly 110 driven by external force drives the contact 170 assembly to switch from a switching-off state to a switching-on state, and at this time, the conductive loop is normally switched on. When a fault occurs, for example, when a short circuit fault occurs in the conductive loop, the current in the loop is instantaneously increased, so that the electromagnetic assembly 160 connected into the conductive loop responds, and the trip box assembly 110 is driven to perform linear motion, so that the trip box assembly 110 is separated from the contact assembly 190, and the trip box assembly 110 and the contact assembly 190 are released from transmission fit, so that the contact assembly 190 is smoothly switched from a closing state to a separating state, and the separation of the conductive loop is completed.

In this process, the electromagnetic assembly 160 and the trip box assembly 110 are in a linear driving manner, so that the driving and matching modes of the electromagnetic assembly 160 and the trip box assembly 110 are simpler, which is helpful for reducing the complexity of the tripping device and improving the accuracy and timeliness of fault tripping.

It should be appreciated that the contact assembly 190 may include a moving contact 170 and a fixed contact 180 that cooperate with each other, where the contact assembly 190 is in a closed state when the moving contact 170 is in contact with the fixed contact 180, and where the conductive loop is on, and where the contact assembly 190 is in an open state when the moving contact 170 is separated from the fixed contact 180.

Alternatively, referring to fig. 1 to 3 in combination, the trip box assembly 110 includes a trip box 113 and a trip piece 114 slidably disposed in the trip box 113, where the electromagnetic assembly 160 is in driving connection with the trip box 113, and the trip piece 114 is in driving fit with the contact assembly 190 through a linkage piece (may be the second push rod 220), so that in a normal working state without failure, the electromagnetic assembly 160 does not act, and smooth closing of the contact 170 assembly driven by the trip piece 114 can be realized by sliding the trip piece 114 relative to the trip box 113, so that the electromagnetic assembly 160 is driven to move or is interfered by the electromagnetic assembly 160 in the process that the trip piece 114 drives the contact 170 assembly to close. When a fault occurs, the electromagnetic assembly 160 drives the trip box 113 to linearly move, so that the trip piece 114 moves linearly along with the trip box 113 and is separated from the second push rod 220, and the driving cooperation with the contact assembly 190 is released, so that the contact assembly 190 is switched from a closing state to a separating state, and the breaking of the conductive loop is completed. It should be understood that the direction of the linear motion of the trip box 113 intersects the sliding direction of the trip member 114, for example, in fig. 3, the direction of the linear motion (up-down motion) of the trip box 113 is perpendicular to the sliding direction (left-right motion) of the trip member 114, so that when the fault trip is required, the electromagnetic assembly 160 drives the trip box 113 to move downward, so that the trip member 114 and the contact assembly 190 are disengaged from the driving engagement in the left-right direction.

To accommodate the intersection of the linear direction of movement of the trip box 113 and the sliding direction of the trip member 114, the trip box assembly 110 and the contact assembly 190 are distributed in an L-shape with the solenoid assembly 160 positioned inside the L-shape. As shown in fig. 1 to 3, the trip box assembly 110 and the electromagnetic assembly 160 may be vertically arranged, and the electromagnetic assembly 160 and the contact assembly 190 may be laterally arranged, i.e., the two directions intersect, so as to make full use of the layout space in the housing 310 of the circuit breaker 300, which is beneficial to miniaturization of the circuit breaker 300.

Specifically, as shown in fig. 3, a magnetic latching device 250 may be configured in the circuit breaker 300, the magnetic latching device 250 is used as a driving source for automatic switching-on, the magnetic latching device 250 is abutted with the left end of the trip member 114 through a first push rod 251, the right end of the trip member 114 is abutted with a linkage member, that is, is abutted with a second push rod 220, the moving contact 170 is rotatably disposed in the circuit breaker 300 shell 310, and the second push rod 220 is in driving connection with the moving contact 170, so that when switching-on is required, the trip member 114 is pushed by the magnetic latching device 250 to slide rightwards relative to the trip box 113 through the first push rod 251, and then the second push rod 220 and the trip member 114 move in the same direction, so that the moving contact 170 is pushed by the second push rod 220 to rotate towards the fixed contact 180 until the moving contact 170 and the fixed contact 180 are reliably contacted, and the conductive loop is conducted. When the fault trip is required, the electromagnetic assembly 160 acts to drive the trip box 113 to move downwards, further drive the trip piece 114 to move downwards, and pull away from the middle of the first push rod 251 and the second push rod 220, so that the third elastic piece 230 starts to release energy to drive the second push rod 220 to move towards the magnetic retaining device 250, and synchronously drive the moving contact 170 to rotate towards a direction away from the fixed contact 180, so that the separation of the moving contact 170 and the fixed contact 180 is completed, namely, the contact assembly 190 is switched from a closing state to a separating state.

Optionally, as shown in fig. 1 to 3, in order to improve the convenience of transmission, the trip device further includes a driving member 130, meanwhile, a driving portion 112 is disposed on the trip box 113, and the electromagnetic assembly 160 is in driving connection with the driving portion 112 of the trip box 113 through the driving member 130, so that when a fault occurs, the electromagnetic assembly 160 drives the driving member 130 to move, and then the driving member 130 drives the trip box 113 to move linearly through the driving portion 112, so that the trip member 114 moves linearly along with the trip box 113 and is in driving engagement with the contact assembly 190, thereby switching the contact assembly 190 from a closing state to a separating state, and completing the separation of the conductive circuit.

Alternatively, the driving member 130 may be fixedly connected to the driving portion 112, that is, when the driving member 130 moves under the driving of the electromagnetic assembly 160, the driving portion 112 drives the trip box 113 to move synchronously, so that when the electromagnetic assembly 160 includes a first elastic member, an iron core assembly 150, and a coil 140 wound around the periphery of the iron core assembly 150, and the iron core assembly 150 includes a moving iron core and a static iron core that are matched with each other, when the first elastic member is matched with the moving iron core, a fault trip is required, the coil 140 generates a magnetic field to drive the moving iron core to move towards the static iron core (in this process, the first elastic member stores energy), and drives the driving member 130 to drive the trip box 113 to move linearly, after the trip is completed, the current in the coil 140 disappears, and therefore, the first elastic member releases energy to provide a reset force to drive the moving iron core to move in a direction away from the static iron core, that is reset, in this process, the trip box 113 is driven to reset synchronously by the driving member 130.

Alternatively, as shown in fig. 1 to 3, a sliding chute 111 is disposed on the trip box 113, and the driving part 112 is located at one end of the sliding chute 111 near the electromagnetic assembly 160, so that one end of the driving member 130 is slidably disposed in the sliding chute 111 and can slide along the extending direction of the sliding chute 111 relative to the sliding chute 111, meanwhile, one end of the driving member 130 is in driving fit with the driving part 112 at one end of the sliding chute 111, that is, when the trip is required to be tripped, the electromagnetic assembly 160 drives the driving member 130 to move, the driving member 130 slides relative to the sliding chute 111 and abuts against the driving part 112 at one end of the sliding chute 111, and then the driving part 112 drives the trip box 113 to move linearly. Therefore, in order to make the electromagnetic assembly 160 smoothly drive the trip box 113 to move linearly through the driving member 130 and the driving portion 112, in a normal operation state without failure, the driving member 130 may be slidably disposed at one end of the sliding chute 111 near the end of the sliding chute 111 having the driving portion 112, for example, the driving member 130 may be slidably disposed at one end of the sliding chute 111 and the driving portion 112 abut or have a smaller gap therebetween.

Alternatively, as shown in fig. 1 to 3, the electromagnetic assembly 160 includes a first elastic member, an iron core assembly 150, and a coil 140 wound around the periphery of the iron core assembly 150, where the coil 140 is connected to the conductive circuit, the iron core assembly 150 includes a stationary iron core and a movable iron core that are mutually matched, and the movable iron core is in driving connection with the driving member 130, so when the contact assembly 190 is in a closing state and needs to be tripped by failure, the coil 140 generates a magnetic field, and drives the movable iron core to move towards the stationary iron core (in this process, the first elastic member stores energy), and drives the driving member 130 to drive the trip box 113 to move linearly, after the switching is completed, the conductive circuit is disconnected, and the current in the coil 140 disappears, so that the first elastic member releases energy to drive the movable iron core to move away from the stationary iron core, i.e. to reset, and drives the driving member 130 to follow the movable iron core, at this time, one end of the driving member 130 slidably disposed in the chute 111 slides towards a direction away from the driving portion 112, i.e. the electromagnetic assembly 160 and the driving member 130 are reset first.

Optionally, in order to facilitate resetting of the trip box 113, as shown in fig. 1 to 3, the trip device further includes a second elastic member 120 connected to the trip box 113, and when the electromagnetic assembly 160 drives the trip box 113 to move downward so as to facilitate fault tripping, the second elastic member 120 stores energy correspondingly, so that after the electromagnetic assembly 160 and the driving member 130 are reset, the second elastic member 120 releases energy to provide a reset force to the trip box assembly 110, so as to cause the trip box 113 to reset. The second elastic member may be sleeved on the outer circumference of the driving member 130. The sliding stroke of the driving member 130 is smaller than the extending length of the sliding groove 111, so that the resetting stroke of the driving member 130 can be smaller than the extending length of the sliding groove 111, and a differential design can be realized.

Optionally, in order to improve the safety of the circuit breaker 300, as shown in fig. 1 or fig. 2, the trip device further includes an overload trip device electrically connected to the conductive circuit, and the overload trip device is in driving connection with the driving member 130, so that when the conductive circuit fails in overload, the overload trip device responds to the overload fault, and drives the trip box assembly 110 to move linearly through the driving member 130, so that the contact assembly 190 is switched from the closed state to the open state. Since the electromagnetic assembly 160 and the overload release are respectively in driving connection with the driving member 130, the electromagnetic assembly 160 and the overload release can move in the same direction as the driving member 130, for example, downward in fig. 1 to 3.

Alternatively, as shown in fig. 1, the overload release includes a bimetal 210 electrically connected to the conductive loop, where the bimetal 210 is directly connected to the driving member 130 by a bending portion, so that when an overload fault occurs, the bimetal 210 is deformed by heat, and then pulls the driving member 130 to move downward, driving the trip box 113 to move linearly, and completing the opening of the contact assembly 190.

Optionally, as shown in fig. 2, the overload release includes a transmission assembly 240 and a bimetal 210 electrically connected to the conductive loop, where the bimetal 210 may be drivingly connected to the driving member 130 via the transmission assembly 240, so that the setting position of the bimetal 210 is more flexible. The transmission assembly 240 may adopt a lever principle, so as to amplify the movement of the bimetal 210, so that the driving member 130 can still be driven smoothly to drive the trip box 113 to move linearly under the condition that the deformation of the bimetal 210 is small, and the opening of the contact assembly 190 is completed. Specifically, as shown in fig. 2, the transmission assembly 240 includes a first link 241 rotatably disposed on a housing 310 of the circuit breaker 300, one end of the first link 241 is in driving engagement with the bimetal 210, a fourth elastic member 242 is connected to the first link 241, and a fifth elastic member 243 is disposed on the housing 310, so that under the combined action of the fourth elastic member 242 and the fifth elastic member 243, one end of the fifth elastic member 243 abuts against the other end of the first link 241 and is balanced. When an overload fault occurs, the bimetal 210 is deformed by heating, so that the first connecting rod 241 is driven to rotate clockwise, the abutting with the fifth elastic element 243 is released, the fifth elastic element 243 is deformed again, and the driving element 130 is pulled to drive the trip box 113 to move linearly, so that the opening of the contact assembly 190 is completed.

Optionally, the first to fifth elastic members 243 of the present application may be elastic members such as springs, elastic sheets, etc., and when they are springs, they may be tension springs, compression springs, torsion springs, etc., and may be specifically and flexibly selected according to actual needs, which is not specifically limited by the present application.

In another aspect of the embodiment of the present application, as shown in fig. 3 and 4, a circuit breaker 300 is provided, which includes a housing 310, a contact assembly 190 disposed in the housing 310, and any one of the trip devices, where a trip box assembly 110 of the trip device is cooperatively driven with the contact assembly 190, so that a driving cooperation form of the electromagnetic assembly 160 and the trip box assembly 110 is simpler through a linear driving cooperation relationship therebetween, which is helpful for reducing complexity of the trip device and improving accuracy and timeliness of fault tripping.

The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims (10)

1. The tripping device is characterized by comprising an electromagnetic assembly (160) and a tripping box assembly (110) in driving connection with the electromagnetic assembly (160), wherein the electromagnetic assembly (160) is used for being connected into a conductive loop with a contact assembly (190), the tripping box assembly (110) is in matched transmission with the contact assembly (190), and the electromagnetic assembly (160) is used for driving the tripping box assembly (110) to move linearly so as to enable the contact assembly (190) to be switched from a closing state to a separating state.

2. The trip device according to claim 1, further comprising a driving member (130), wherein a driving portion (112) is provided on the trip box assembly (110), the electromagnetic assembly (160) is in driving connection with the driving portion (112) of the trip box assembly (110) through the driving member (130), and the electromagnetic assembly (160) is used for driving the driving member (130) to move towards the trip direction to drive the trip box assembly (110) to move linearly.

3. The trip device according to claim 2, wherein a chute (111) is provided on the trip box assembly (110), the driving part (112) is located at one end of the chute (111), one end of the driving member (130) is slidably connected with the chute (111) along the extending direction of the chute (111) and is in driving fit with the driving part (112), and the sliding stroke of the driving member (130) is smaller than the extending length of the chute (111).

4. The trip unit of claim 3, wherein said electromagnetic assembly (160) includes a first elastic member, an iron core assembly (150) and a coil (140) wound around an outer periphery of said iron core assembly (150), said coil (140) being connected to said conductive loop, said iron core assembly (150) including a stationary iron core and a movable iron core cooperating with each other, said movable iron core being drivingly connected to said driving member (130), said first elastic member being adapted to provide a restoring force to said movable iron core.

5. The trip device of claim 1 wherein said trip box assembly (110) and said contact assembly (190) are distributed in an L-shape, said electromagnetic assembly (160) being located inside said L-shape.

6. The trip unit according to any one of claims 2 to 4, further comprising a second elastic member (120) connected to the trip box assembly (110) and sleeved on the outer periphery of the driving member (130), wherein the second elastic member (120) is configured to provide a restoring force to the trip box assembly (110).

7. The trip unit of any one of claims 2 to 4, further comprising an overload trip electrically connected to said conductive loop, said overload trip being drivingly connected to said driving member (130), said overload trip being adapted to drive said driving member (130) to move said trip housing assembly (110) linearly to switch said contact assembly (190) from a closed state to an open state.

8. The trip unit of claim 7, wherein said overload trip includes a bimetal (210) electrically connected to said conductive loop, said bimetal (210) being drivingly connected to said driving member (130);

Or, the overload release comprises a transmission assembly (240) and a bimetal (210) electrically connected with the conductive loop, and the bimetal (210) is in driving connection with the driving piece (130) through the transmission assembly (240).

9. The trip device according to claim 1, wherein the trip box assembly (110) comprises a trip box (113) and a trip piece (114) slidably arranged in the trip box (113), the electromagnetic assembly (160) is in driving connection with the trip box (113), the trip piece (114) is in driving fit with the contact assembly (190) through a linkage piece, the trip piece (114) is driven to slide relative to the trip box (113) so as to drive the contact assembly (190) to be switched from a switching-on state to a switching-off state through the linkage piece, the electromagnetic assembly (160) drives the trip box (113) to linearly move so as to drive the trip piece (114) to be in driving fit with the contact assembly (190) to switch the contact assembly (190) from the switching-on state to the switching-off state, and the moving direction of the linkage piece is perpendicular to the moving direction of the trip box (113).

10. A circuit breaker, characterized by comprising a housing (310) and a contact assembly (190) arranged in the housing (310) and a trip device according to any one of claims 1 to 9, the trip box assembly (110) of the trip device being in co-operation transmission with the contact assembly (190).