CN218568760U

CN218568760U - Circuit breaker and combined switch electrical apparatus

Info

Publication number: CN218568760U
Application number: CN202222623154.9U
Authority: CN
Inventors: 张协利; 陈闽; 贾永帅; 赖森林; 周燕海; 孙冠上
Original assignee: Xiamen Hongfa Electrical Safety and Controls Co Ltd
Current assignee: Xiamen Hongfa Automotive Electronics Co Ltd
Priority date: 2022-09-29
Filing date: 2022-09-29
Publication date: 2023-03-03
Anticipated expiration: 2032-09-29

Abstract

The utility model relates to a circuit breaker and combined switch electrical apparatus, including the tripping device who is used for realizing the dropout separating brake, tripping device is detained including the jump, still include external attachment link gear, external attachment link gear includes first linkage and second linkage, first linkage is connected with the jump coaxial linkage ground of detaining, the second linkage is mobile to locate one side of first linkage and can accept the promotion of first linkage when the jump is detained, be equipped with a coupling connecting portion on the second linkage, the coupling connecting portion are used for carrying out coupling connection with external attachment, make one of them of second linkage and external attachment drive another production action through the cooperation of coupling connection. The utility model discloses a set up outside annex link gear for the circuit breaker can the external outside annex of modularization, just the utility model discloses an one set of outside annex link gear can the external annex of multiple difference of optional, has greatly improved the flexibility of circuit breaker installation external annex.

Description

Circuit breaker and combined switch electrical apparatus

Technical Field

The utility model relates to a technical field is made to the circuit breaker, concretely relates to circuit breaker that can external attachment.

Background

At present, for a circuit breaker with a tripping and opening function, a single tripping and opening function cannot meet the current requirements more and more, for example, an alarm function can be generated when the circuit breaker is required to trip and open, and an alarm device is also generally configured for the circuit breaker; if the circuit breaker is required to have multiple tripping modes, other types of trippers need to be configured besides the tripper of the circuit breaker. That is to say, the circuit breaker is required to have the capability of modular improvement in addition to the function of the main body, however, the internal installation space of the circuit breaker main body is limited, and the design concept based on miniaturization does not usually leave the installation space for reconfiguring other modules, so the circuit breaker capable of flexibly connecting accessories becomes one direction of the current circuit breaker structure research. The circuit breaker which can be externally connected with accessories on the market at present often has the defects of complex structure, low flexibility, poor universality and the like.

SUMMERY OF THE UTILITY MODEL

Therefore, to the above problem, the utility model provides a configuration optimization's circuit breaker and have the combined switch electrical apparatus of this circuit breaker.

The utility model discloses a following technical scheme realizes:

the utility model provides a circuit breaker, including the tripping device who is used for realizing tripping and separating brake, tripping device includes the jump knot, still includes outside annex link gear, outside annex link gear includes first linkage and second linkage, first linkage with the jump is detained and is connected with coaxial linkage, but second linkage mobile locate one side of first linkage can accept when the jump knot is broken out the promotion of first linkage, be equipped with coupling connecting portion on the second linkage, coupling connecting portion are used for carrying out coupling connection with outside annex, make one of them of second linkage and outside annex can pass through coupling connection's cooperation drives another production action.

Preferably, the tripping mechanism further comprises a lock catch for locking or unlocking the tripping action of the trip, the circuit breaker further comprises a third linkage member, the third linkage member is movably arranged on one side of the second linkage member and can be pushed by the second linkage member to act, and the lock catch is provided with a shifting part extending to one side of the third linkage member, which deviates from the second linkage member, so that the second linkage member can further shift the shifting part when pushing the third linkage member to unlock the trip from the lock catch, and tripping can be performed.

Preferably, the external accessory includes a coupling matching portion coupled to the coupling connection portion, and the external accessory is a passive triggering accessory that triggers the coupling matching portion by pushing the second linkage member through the first linkage member, or an active driving accessory that actively drives the second linkage member through the coupling matching portion.

Preferably, one of the coupling connection part and the coupling fitting part is a jack, and the other is a plug rod inserted into the jack.

Preferably, the coupling connection portion is a jack, the coupling fitting portion is an insert rod inserted into the jack, and the aperture of the jack is larger than the rod diameter of the insert rod.

Preferably, opposite sides of the second and third linkage members are respectively provided with a first protrusion and a second protrusion which protrude and approach each other.

Preferably, the movable contact device further comprises a movable contact rotating shaft for driving the movable contact, the third link is a swing arm structure, a first end of the third link is rotatably connected to the movable contact rotating shaft, and a second end of the third link abuts against a fixed contact point in a direction away from the toggle part under the action of an elastic element.

Preferably, the relative positions of the second linkage, the third linkage and the movable contact rotating shaft satisfy: when the moving contact rotating shaft is opened, the first end of the third linkage member can be driven to deflect towards the direction far away from the second linkage member, so that the first end of the third linkage member is separated from the stroke range of the second linkage member.

Preferably, the opposite sides of the second linkage member and the third linkage member are respectively provided with a first protruding portion and a second protruding portion which protrude and approach each other, and the first protruding portion and the second protruding portion are in a sharp-angled shape with gradually contracted front ends, so that the second protruding portion can be quickly separated from the stroke range of the first protruding portion when the moving contact rotating shaft is opened.

Preferably, the circuit breaker further comprises an indicator for indicating the state of the circuit breaker, wherein the indicator is a lever structure with one end rotatably connected with the rotating shaft of the movable contact, and the fixed contact is the rotating shaft of the indicator.

Preferably, the second linkage member is a swing arm which is rotatably arranged, and a limiting column is fixedly arranged on one side of the second linkage member, which faces to the direction close to the movement direction of the first linkage member, so as to limit the limit position of the second linkage member, which swings to the direction close to the movement direction of the first linkage member.

Preferably, the trip device further comprises a mounting base, the mounting base comprises a first side plate and a second side plate which are oppositely jointed, the trip mechanism is arranged between the first side plate and the second side plate, and the external accessory linkage mechanism is arranged on the outer side surface of the first side plate, so that the external accessory linkage mechanism and the trip mechanism are in different mounting levels.

Based on foretell circuit breaker, the utility model discloses still provide combined switch electrical apparatus, include as above the circuit breaker and with circuit breaker coupling connection's outside annex.

The utility model discloses following beneficial effect has: the utility model discloses a set up outside annex link gear for the circuit breaker can the external outside annex of modularization, just the utility model discloses an one set of outside annex link gear can the external annex of multiple difference of optional, has greatly improved the flexibility of circuit breaker installation external annex.

Drawings

Fig. 1 is an overall schematic diagram of a circuit breaker in embodiment 1;

fig. 2 is an exploded view of the circuit breaker of embodiment 1;

fig. 3 is a schematic perspective view of the circuit breaker of embodiment 1 (with the upper cover removed);

fig. 4 is a schematic view of the conductive system, the operating mechanism and the trip mechanism in embodiment 1;

FIG. 5 is an exploded view of the operating link assembly in embodiment 1;

fig. 6 is a schematic view (closing state) of the external accessory linkage assembly assembled to the circuit breaker in embodiment 1;

fig. 7 is a perspective view of the first side plate in embodiment 1;

fig. 8 is a schematic view of a first link member in embodiment 1;

FIG. 9 is a schematic view of a second linkage member in embodiment 1;

fig. 10 is a schematic view of a third link in embodiment 1;

FIG. 11 is a schematic view of an indicator in example 1;

FIG. 12 is a schematic view showing the external attachment forming a coupling connection through the plunger and the insertion hole of the second link member in embodiment 1;

FIG. 13 is a schematic view showing the first linkage member pushing the second linkage member to trigger the passive triggering type external accessory in accordance with embodiment 1;

fig. 14 is a schematic diagram of the embodiment 1 in which the driving type external accessory pushes the second linkage member and then pushes the third linkage member to trigger the trip and the brake separation;

fig. 15 is a schematic view of the external accessory linkage assembly of the circuit breaker of embodiment 1 (open state).

Detailed Description

To further illustrate the embodiments, the present invention provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the embodiments. With these references, one of ordinary skill in the art will appreciate other possible embodiments and advantages of the present invention. The components in the drawings are not necessarily to scale, and similar reference numerals are generally used to identify similar components.

The present invention will now be further described with reference to the accompanying drawings and detailed description.

Example 1:

referring to fig. 1 to 4, as a preferred embodiment of the present invention, a circuit breaker, more specifically, a residual current operated circuit breaker is provided, which includes an outer casing 100 and a conductive system 3, wherein the outer casing 100 is a circuit breaker housing formed by an upper cover 1001 and a base 1002 which are fixedly joined; referring to fig. 4, the conductive system 3 is disposed inside the outer casing 100, and the conductive system 3 includes a connection terminal 300, a movable contact 301, a fixed contact 302, a conductive copper bar, and the like to form a conductive loop of the circuit breaker, where the movable contact 301 has a moving stroke relative to the fixed contact 302 to achieve contact or separation between the movable contact 301 and the fixed contact 302, so as to achieve opening and closing of the circuit breaker. Still be equipped with in the outer shell 100 inner chamber and be used for residual current measuring zero sequence current transformer 1003, be used for carrying on the arc extinguishing grid 1004 that the arc extinguishing was handled and be used for realizing tripping the electromagnetic trip 4 of separating brake, still install the test button 1005 that is used for realizing the detection of circuit breaker electric leakage function on the outer shell 100.

The circuit breaker further comprises an operating linkage assembly 2, and referring to fig. 4 and 5, the operating linkage assembly 2 comprises a first side plate 22 and a second side plate 23 which are opposite in the left-right direction, the first side plate 22 and the second side plate 23 are oppositely jointed to form a mounting base of the operating linkage assembly 2, the operating linkage assembly 2 further comprises an operating mechanism, a tripping mechanism and an external accessory linkage mechanism which are arranged on the mounting base, wherein the operating mechanism comprises a handle 11, a first connecting rod 13, a second connecting rod 14 and a third connecting rod 15; the tripping mechanism comprises a jump buckle 17, a rebuckling 18 and a lock catch 20; the external accessory linkage includes a first link 26, a second link 27 and a third link 29. The operating mechanism is used for controlling the opening and closing motions of the moving contact 301; the tripping mechanism is linked with the operating mechanism and is used for cooperating with the electromagnetic trip 4 to realize tripping and brake separating of the circuit breaker. The external accessory linkage mechanism is used for linkage of the circuit breaker and external accessories (including an active triggering accessory and a passive driving accessory).

Specifically, the handle 11, the jump buckle 17, the rebuckling 18 and the lock catch 20 are all rotatably arranged on the mounting base; one end of the first connecting rod 13 is hinged with the handle 11, and the other end of the first connecting rod is hinged with the same hinge point with the second connecting rod 14 and the third connecting rod 15; the second connecting rod 14 is also hinged on the jump buckle 17; the third connecting rod 15 is also hinged with the moving contact rotating shaft 16; the movable contact rotating shaft 16 is also hinged to the outer shell 100, the movable contact 301 is mounted on the movable contact rotating shaft 16 and moves along with the movement of the movable contact rotating shaft 16, for example, the movable contact 301 may be fixed to or hinged to the movable contact rotating shaft 16. In this embodiment, the movable contact 301 is hinged to the movable contact rotating shaft 16, one end of the movable contact 301 is limited at the limiting position of the movable contact rotating shaft 16 by an elastic element, and when the other end of the movable contact 301 is limited by the fixed contact 302 during the over-stroke movement of the movable contact 30, one end of the movable contact 301 leaves the limiting position of the movable contact rotating shaft 16 under the action of the elastic element.

In the trip mechanism, the latch 20 is press-fitted to the rebutch 18, and the rebutch 18 is press-fitted to the jump buckle 17 to restrict the rotation of the jump buckle 17. When the switch is manually switched on or switched off, the tripping device 17 is in a locking state with balanced stress with the rebuthing device 18 and the lock catch 20. Since the trip 17 is locked, when the switch is manually opened or closed, the second link 14 rotates with a hinge point a between the second link and the trip 18 as a pivot, so as to drive the third link 15, the movable contact rotating shaft 16 and the movable contact 301 to move. When the latch 20 is unlocked, the stress balance state is broken, so that tripping and brake opening are caused, the trip 17 is unlocked (tripped), the second connecting rod 14 is rapidly driven to rotate by taking the hinge point B of the trip 17 and the mounting base as a rotating shaft, the moving contact 301 is driven to trip and brake opening, and breaking work is rapidly realized. The tripping mechanism formed by the jump buckle and the buckle lap joint is a common technology in the circuit breaker, but the second buckle 18 is added in the embodiment, so that the buckle 20 locks the second buckle 18, the second buckle 18 locks the jump buckle 17, in other words, the jump buckle 17 applies force to the second buckle 18 first, and then the buckle 18 applies force to the buckle 20. Therefore, the force arm of the jump buckle 17 for applying force to the lock buckle 20 is indirectly lengthened through the rebuckling 18, under the premise that the torque of the jump buckle 17 is not changed, the force of the jump buckle 17 acting on the lock buckle 20 is smaller, the tripping force of the electromagnetic release 4 required for unlocking the lock buckle 20 is also smaller, and the contact can be automatically disconnected when an electric leakage fault occurs.

The operating mechanism and the tripping mechanism are arranged between the first side plate 22 and the second side plate 23, and the external accessory linkage mechanism is arranged on the outer side surface of the first side plate 22, so that the external accessory linkage mechanism, the operating mechanism and the tripping mechanism are in different installation levels, and the utilization rate of the internal space of the circuit breaker and the compactness of the structure are improved. And the first side plate 22 spaces the external accessory linkage so that a more independently functioning external accessory linkage can interfere less with the operating mechanism and trip mechanism.

Referring to fig. 6-11, the first linkage 26 is rotatably disposed on the mounting base and is coaxially coupled to the jumper 17. The first linkage 26 in this embodiment is a semicircular plate, the first linkage 26 is hinged to the rotating shaft 2206 of the first side plate 22 through the central hole 2601 of the first linkage 26, and the rotating shaft 2206 is coaxial with the rotating point B of the jump buckle 17; the first link 26 is further provided with a coupling hole 2602, and an interlocking shaft is inserted through the coupling hole 2602 to be fitted into the jumper 17, thereby achieving synchronous interlocking of the jumper 17 and the first link 26 by the interlocking shaft. Other embodiments may employ other coupling means to connect the jumper 17 and the first link member 26, such as attaching the two to the same pivot. The first linkage 26 is used to trip the second linkage 27 during the trip movement of the trip 17, so that in other embodiments the first linkage 26 may also be a swing arm.

The second linkage member 27 is a swing arm pivotally connected to the mounting base and has a center of rotation at point C. Specifically, the second linkage member 27 is hinged to the hole 2207 of the first side plate 22 by the rotation shaft 2701, and the free end of the second linkage member 27 is disposed close to the first linkage member 26 and can receive the striking of the first linkage member 26. The first elastic member 28 has one end acting on the mounting base and the other end acting on the second linkage member 27 to provide a return elastic force for swinging the second linkage member 27 in a direction approaching the first linkage member 26. The first elastic member 28 is a torsion spring in this embodiment. A limiting column 33 is fixedly arranged on one side of the second linkage member 27 close to the moving direction of the first linkage member 26 to limit the limit position of the second linkage member 27 swinging towards the direction close to the first linkage member 26. In other embodiments, the second linkage member 27 may be configured in a direct-acting up-and-down configuration.

The indicator 31 is a lever structure, a rotating shaft 3101 rotatably connected in the hole 2209 of the first side plate 22 is arranged at the middle position of the length of the indicator 31, one end of the indicator 31 is hinged with the movable contact rotating shaft 16 through a U-shaped clamping groove 3102, and when the movable contact rotating shaft 16 rotates, the other end of the indicator 31 is driven to deflect to different positions so as to indicate the state of the circuit breaker.

The third link 29 is also a swing arm structure, and a first end of the third link 29 is hinged to the movable contact rotating shaft 16, and specifically, a hole 2901 provided at the first end of the third link 29 is rotatably connected to a boss (not shown) provided on the rotating shaft 16. The third link 29 is disposed on one side of the second link 27 and can be pushed by the second link 27 to operate, and the latch 20 is provided with a toggle portion 201 protruding to one side of the third link 29 away from the second link 27 through the second side plate 22.

The second linkage member 27 is provided with a coupling portion for coupling with an external accessory. The external accessory refers to a component which is arranged outside the circuit breaker body and can generate a linked reaction with the circuit breaker, and in the embodiment, the external accessory mainly comprises two types, one type is a passive triggering accessory such as an auxiliary contact device and an alarm contact device, and the other type is an active driving accessory such as an undervoltage release, an overvoltage release and a shunt release. The external accessory is provided with a coupling matching part which is coupled with the coupling connecting part of the second linkage member 27, so that one of the second linkage member 27 and the external accessory can drive the other one to act through the matching of the coupling matching part and the coupling connecting part. Referring to fig. 12, a schematic diagram of the coupling connection between the external accessory 500 and the second linkage member 27 is shown, in this embodiment, the coupling connection portion is a socket 2705 provided on the second linkage member 27, and the coupling fitting portion is a plunger 600 inserted into the socket 2705, but in other embodiments, the coupling fitting portion may be a socket, and the coupling connection portion may be a plunger inserted into the socket. In this embodiment, the aperture of the insertion hole 2705 is larger than the diameter of the insertion rod 600, so that the insertion hole 2705 can be adapted to insertion rods with more sizes and specifications, and the applicability is improved.

Next, describing the principle of the external accessory linkage mechanism, referring to fig. 6 and 13, if the external accessory 500 is a passive triggering type accessory, such as an alarm contact device, when the breaker trip 17 is tripped, the first linkage member 26 moves along with the trip 17 and further pushes the second linkage member 27 to swing, and then the second linkage member 27 pushes the inserted link 600 to move through the insertion hole 2705 and the insertion rod 600, so as to trigger the contact closing of the alarm contact device to generate an alarm signal. Referring to fig. 6 and 14, if the external accessory 500 is an active driving accessory, such as an undervoltage release, when the undervoltage release detects undervoltage, the insertion rod 600 actively moves, the insertion hole 2705 and the insertion rod 600 are inserted and matched to push the second linkage 27 to move, the second linkage 27 further pushes the third linkage 29, and the third linkage 29 pulls the toggle portion 201 of the latch 20, so that the circuit breaker body is tripped and opened. The external accessories of circuit breaker can be modularized by setting the external accessory linkage mechanism, and the external accessories of multiple differences can be selected and matched by one set of external accessory linkage mechanism of this embodiment, so that the flexibility of installing the external accessories of the circuit breaker is greatly improved.

As shown in fig. 6, 9, and 10, the first protrusion 2704 and the second protrusion 2904 that protrude and approach each other are provided on the opposite sides of the second link 27 and the third link 29, respectively, and the response speed when the second link 26 and the third link 29 are pushed against the link is increased by the mutual approach of the first protrusion 2704 and the second protrusion 2904.

In addition to the engagement of the insertion hole and the insertion rod, in other embodiments, the coupling connection portion and the coupling engagement portion may also adopt other coupling connection structures, such as a magnetic attraction connection, a hinge connection, and a detachable fixed connection.

With continued reference to fig. 6, 9 and 10, the second end 2902 of the third link 29 abuts against the rotating shaft 3101 of the indicating member 31 in a direction away from the toggle portion 201 under the action of the second elastic member 30, so as to prevent the third link 29 from mistakenly touching the latch 20. The second end of the third link 29 may not abut against the rotation shaft 3101 in other embodiments, as long as a fixed contact point is provided for the second end of the third link 29 to abut against, for example, the fixed contact point may be extended from the second side plate 22. In the embodiment, the first end of the third link 29 is hinged to the movable contact rotating shaft 16, and when the second end 2902 of the third link 29 abuts against the fixed contact point, as shown in fig. 15, in the present embodiment, when the movable contact rotating shaft 16 rotates to the opening position, the first end of the third link 29 can be driven to deflect away from the second link 27, so as to depart from the stroke range of the second link 27. At this time, the second link 27 does not contact the third link 29 regardless of the motion, so as to ensure that the circuit breaker can be successfully closed (in the product closing process, if the insertion rod 600 of the external accessory is stationary, the second link 27 is stationary at the position of the limiting post 33, and the third link 28 moves to a position close to the second link 27 along with the movable contact rotating shaft 16. When the external accessory moves, the insertion rod 600 pushes the second link 27, and then the second link 27 pushes the third link 29, so as to push the latch to unlock, so that the product moves to open, and if the insertion rod 600 of the external accessory moves along with the accessory closing, the second link 27 moves to the position of the limiting post 33 along with the insertion rod 600, and during this process, the third link 28 also moves along with the movable contact rotating shaft 16, and keeps a certain gap with the second link 27 all the time, so as to ensure that the circuit breaker and the accessory are successfully closed).

In this embodiment, first protrusion 2704 and second protrusion 2904 are sharp and tapered at their tips so that first protrusion 2704 and second protrusion 2904 can be quickly offset when third link 29 is deflected away from second link 27 to change its angle, and second protrusion 2904 can be quickly separated from the range of travel of first protrusion 2704 to keep them from touching again.

The first elastic member 28 and the second elastic member 30 are torsion springs in the present embodiment, but may be other elastic members such as tension springs and compression springs in other embodiments, and only the installation manner needs to be adaptively changed to ensure potential energy with the same motion effect.

Example 2:

the embodiment provides a combined switch electric appliance, which comprises the circuit breaker in the embodiment 1 and an external accessory coupled with the circuit breaker. Since this embodiment employs the circuit breaker of embodiment 1, the same technical effects as those of the circuit breaker of embodiment 1 are obtained. Coupled external accessories include, without limitation: auxiliary contact device, warning contact device, undervoltage release, overvoltage release, shunt release.

While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. The utility model provides a circuit breaker, is including being used for realizing the tripping device who breaks off the floodgate, tripping device is including jumping the knot, its characterized in that: the trip buckle is movably arranged on one side of the first linkage part and can receive the pushing of the first linkage part when the trip buckle is released, and the second linkage part is provided with a coupling connecting part which is used for being coupled with an external accessory so that one of the second linkage part and the external accessory can drive the other one to move through the matching of the coupling connection.

2. The circuit breaker of claim 1, wherein: the tripping mechanism further comprises a lock catch used for locking or unlocking the tripping action of the tripping mechanism, the circuit breaker further comprises a third linkage piece, the third linkage piece is movably arranged on one side of the second linkage piece and can be pushed by the second linkage piece to act, and the lock catch is provided with a shifting part extending to one side of the third linkage piece, which deviates from the second linkage piece, so that the second linkage piece can further shift the shifting part to unlock the tripping mechanism when pushing the third linkage piece, and tripping and separating can occur.

3. The circuit breaker of claim 2, wherein: the external accessory comprises a coupling matching part coupled with the coupling connecting part, and the external accessory is a passive triggering accessory which triggers the coupling matching part by pushing a second linkage part through a first linkage part, or an active driving accessory which actively drives the second linkage part through the coupling matching part.

4. The circuit breaker of claim 3, wherein: one of the coupling connection part and the coupling fitting part is a jack, and the other is a plug rod inserted into the jack.

5. The circuit breaker of claim 4, wherein: the coupling connection part is a jack, the coupling matching part is an insert rod inserted into the jack, and the aperture of the jack is larger than the rod diameter of the insert rod.

6. The circuit breaker of claim 2, wherein: the opposite sides of the second linkage piece and the third linkage piece are respectively provided with a first protruding part and a second protruding part which mutually protrude and approach towards each other.

7. The circuit breaker of claim 2, wherein: the third linkage is a swing arm structure, the first end of the third linkage is rotatably connected to the moving contact rotating shaft, and the second end of the third linkage is abutted to a fixed contact point in a direction away from the shifting part under the action of an elastic element.

8. The circuit breaker of claim 7, wherein: the relative positions of the second linkage, the third linkage and the moving contact rotating shaft satisfy that: when the moving contact rotating shaft is opened, the first end of the third linkage member can be driven to deflect towards the direction far away from the second linkage member, so that the first end of the third linkage member is separated from the stroke range of the second linkage member.

9. The circuit breaker of claim 8, wherein: the opposite sides of the second linkage piece and the third linkage piece are respectively provided with a first protruding part and a second protruding part which protrude and approach towards each other, and the first protruding part and the second protruding part are in sharp-angled shapes with gradually contracted front ends, so that the second protruding part can be quickly separated from the stroke range of the first protruding part when the moving contact rotating shaft is opened.

10. The circuit breaker of claim 7, wherein: the circuit breaker further comprises an indicating piece for indicating the state of the circuit breaker, wherein the indicating piece is a lever structure with one end rotatably connected with the rotating shaft of the movable contact, and the fixed contact point is the rotating shaft of the indicating piece.

11. The circuit breaker according to claim 1 or 8 or 9, characterized in that: the second linkage part is a swing arm which can be rotatably arranged, and a limiting column is fixedly arranged on one side of the second linkage part, which faces to the direction close to the movement direction of the first linkage part, so as to limit the limit position of the second linkage part, which swings towards the direction close to the first linkage part.

12. The circuit breaker of claim 1, wherein: the trip mechanism is arranged between the first side plate and the second side plate, and the external accessory linkage mechanism is arranged on the outer side surface of the first side plate, so that the external accessory linkage mechanism and the trip mechanism are in different installation levels.

13. Combination switch electrical apparatus, its characterized in that: comprising a circuit breaker according to any of claims 1-12 and an external accessory coupled to the circuit breaker.