CN213583678U - Board plug-in circuit breaker - Google Patents

Abstract

The utility model belongs to the technical field of the circuit breaker, a board plug-in type circuit breaker is disclosed, pegs graft on the mother board and form protection circuit from outside terminal surface inlet wire, and inside has electromagnetic assembly, binding post and tripping device, electromagnetic assembly has two action portions, and two action portions receive the magnetism to make the direction unanimous to promote tripping device by one of them action portion and move. Wherein through the cooperation of the electromagnetic component who is equipped with tripping device to provide comparatively stable breaking capacity under the prerequisite that does not change or reduce the volume, satisfy the installation demand of current small size circuit breaker.

Description

Board plug-in circuit breaker

Technical Field

The utility model belongs to the technical field of the circuit breaker, concretely relates to board plug-in type circuit breaker.

Background

The electromagnet is a device which generates electromagnetism by electrifying, a commonly used method is to protect short circuit by the electromagnet, a conductive winding matched with the power of the iron core is wound outside the iron core, and the structure that the coil which is electrified with current has magnetism like a magnet is the electromagnet. In addition, in order to demagnetize the electromagnet immediately after power failure, the electromagnet is usually made of soft iron or silicon steel material with fast demagnetization. When the electromagnet is electrified, the electromagnet has magnetism, and the magnetism disappears along with the electrification after the electromagnet is powered off.

When the electric switch detects the running current of the main circuit, a signal is provided through a CT (current transformer) arranged on the main circuit. As the integration degree of electrical equipment is higher and higher, the integration of CT into a large switch has been already reported. This patent is integrated to the electro-magnet of switch short-circuit protection to bulky CT, moves towards intellectuality for terminal switch and provides the condition.

The existing electromagnet structure can be divided into various forms according to the application and the structure, and the electromagnet structure can receive electric signals to act, so that the automatic control effect can be realized by matching with other structures. The electrical signals can be active signals and passive signals, i.e. active control and passive control. Particularly, when the circuit protection device is applied, abnormal currents (the abnormal currents are mainly large currents of more than 5In and short-circuit currents) can be timely operated, so that the circuit can be cut off or other functions can be achieved. The existing circuit breaker equipment can adjust the internal space in order to meet various installation conditions, and can adjust an internal tripping mechanism or a braking mechanism in order to ensure that the internal tripping mechanism or the braking mechanism still can achieve better breaking capacity after the original volume is reduced. However, the prior art does not provide a better implementation scheme to ensure the stable breaking effect.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem that prior art exists, the utility model provides a circuit breaker structure improves the driving force as far as possible under the prerequisite that does not change the volume through utilizing original electromagnetic component structure in inside, realizes better automatic circuit-breaking effect with the tripping device cooperation.

The utility model discloses the technical scheme who adopts does:

in a first aspect, the utility model discloses a board plug-in type circuit breaker pegs graft on the mother board and forms protection circuit from outside terminal surface inlet wire, and inside has electromagnetic assembly, binding post and tripping device, electromagnetic assembly has two action portions, and two action portions receive the magnetism to make the direction unanimous to promote tripping device by one of them action portion and move.

The board-inserted circuit breaker is a circuit breaker structure which is arranged in a circuit protection cabinet arranged in an existing communication base station, is connected with a main circuit through a busbar structure, and is provided with a plurality of standard protectors in an inserted mode on a busbar, so that a standardized installation effect is achieved, and replacement and maintenance are facilitated. In order to standardize the wiring layout mode, the outermost end face inserted from the circuit breaker is used as a wiring port and is connected to a motherboard through a plurality of modules which are mainly connected in series inside the circuit breaker. The module in the circuit breaker comprises an electromagnetic assembly, a wiring terminal and a tripping mechanism, wherein the electromagnetic assembly is matched with the tripping mechanism, and when abnormal current occurs in an accessed circuit, the tripping mechanism with an internal action trend is pushed to move towards the tripping side by the automatic action of the electromagnetic assembly, so that the effect of protecting the circuit is realized.

Different from the existing circuit breaker, the shell is different from the existing circuit breaker due to the wiring standard requirement of the small circuit breaker, and the special plug-in structure adopted in the shell enables the shell to have smaller internal space. Simultaneously because be the outer end inlet wire, then the binding post structure of inside setting is different with current structure, needs occupy certain space, then needs the adjustment to the space of other parts.

In order to adapt to a smaller installation space, the electromagnetic assembly is ensured to have better breaking capacity on the premise of volume reduction or volume reduction of the tripping mechanism, so that another action part is additionally arranged on the basis of the existing structure of the original single action part, and therefore the electromagnet can generate larger pushing force when the same current passes through, and the larger pushing force is the premise of ensuring stable breaking of the tripping mechanism.

It is worth to be noted that the structural design of the dual power portions includes various implementation manners, and the most important of them is to optimize on the basis of the existing electromagnetic assembly structure, and add the second power portion at a proper position, so that it can be matched with the existing structure, and form the superposition of force with the original power portion on the premise of not changing the original volume. That is to say, when the coil receives the abnormal current, two power parts in the effective magnetic field of the coil can act simultaneously, two acting forces can be mutually superposed through a proper transmission connection mode, and any one of the two power parts is matched with the tripping mechanism to trip.

In combination with the first aspect, the present invention provides the first embodiment of the first aspect, wherein the one of the actuating portions includes a yoke iron frame and an armature piece, the armature piece is a rotating member, and the armature piece is caused to rotate toward the yoke iron frame by a magnetic field generated by a coil disposed inside the yoke iron frame.

It is worth explaining that, originally, the yoke iron frame is arranged in the electromagnetic assembly, the structure is made of soft magnetic materials, and the magnetic field of the coil can be sealed in the electromagnetic assembly as much as possible, so that the attraction force of the electromagnetic coil is increased, and the efficiency of the electromagnet is improved. The coil and one of the power parts are arranged in the yoke iron frame, and two ends of the coil extend out of the connecting ends to be connected with an external circuit. The armature piece that then sets up utilizes the special construction of yoke iron frame, will originally the yoke iron frame seal one side originally and set up to the opening to be equipped with the armature piece that belongs to rotating member at the opening part, thereby when having the magnetic field in inside, the armature piece has the trend of clapping towards yoke iron frame rotation. The principle is that after a magnetic field is generated in the coil, the original power part acts to rotate the armature sheet, so that the electromagnetic gap between the armature sheet and the yoke frame is continuously reduced, the electromagnetic attraction force (the yoke frame and the armature sheet are in clapping) is increased, and the circuit breaker is rapidly and stably tripped.

Combine the first embodiment of first aspect, the utility model provides a second kind of embodiment of first aspect, another action portion is including all setting up the quiet iron core in the coil and moving the iron core, it is equipped with the pusher to move the iron core tip, is connected with armature plate transmission through the pusher tip.

It is worth to say that the armature sheet is arranged on one side of the pushing head at the end part of the movable iron core, when tripping is carried out, the armature sheet is pulled by the pushing head of the movable iron core firstly, and along with the continuous reduction of the gap between the armature sheet and the yoke frame, the armature sheet can provide extra power.

In combination with the second embodiment of the first aspect, the present invention provides a third embodiment of the first aspect, further comprising a sleeve, wherein the movable iron core and the static iron core are both disposed in the sleeve;

a rotary seat is arranged on one side of the end part of the sleeve and is rotatably connected with the rotating end of the armature sheet through the rotary seat.

Combine the third embodiment of the first aspect, the utility model provides a fourth embodiment of the first aspect, be equipped with the clearance on the armature piece, the pushing head passes behind the clearance and is equipped with the expansion end keeping away from quiet iron core one side, gives the pulling force of armature piece to yoke frame one side lock when moving the iron core and receiving the magnetomotive action.

With reference to the first to fourth embodiments of the first aspect, the present invention provides a fifth embodiment of the first aspect, wherein the trip mechanism includes a latch and a rotating handle, and one end of the rotating handle is provided with a moving contact that is in contact with the electromagnetic assembly;

the lock catch is arranged on the rotating handle and limits the movement of the rotating handle when the movable contact is contacted with the fixed contact in the breaker.

Combine the fifth implementation mode of first aspect, the utility model provides a sixth implementation mode of first aspect, the hasp is the rotating-structure of middle part for changeing the point, changes some one end and is equipped with the dog that is used for restricting the action of turning handle, the other end be equipped with the electromagnetism subassembly in an action portion complex clap the head, this action portion promotes after the action and claps the head action to drive the rotation of whole hasp and remove the restriction.

With reference to the sixth implementation manner of the first aspect, the present invention provides the seventh implementation manner of the first aspect, wherein the trip mechanism further includes an operating assembly, and the operating assembly is in transmission connection with the rotating handle through an a rod;

the rotating handle is provided with a sliding groove at one end far away from the movable contact, one end of the rod A slides in the sliding groove, and the blocking head rotates to one side of the sliding groove and limits the end part of the rod at one end of the sliding groove when the movable contact is in contact with the fixed contact.

Combine the seventh kind implementation mode of first aspect, the utility model provides an eighth kind implementation mode of first aspect, the operating assembly is including the handle and the driving medium that are rotating-structure, the handle passes through B member transmission with the driving medium and is connected.

With reference to the fifth implementation manner of the first aspect, the present invention provides a ninth implementation manner of the first aspect, wherein a housing is provided outside the electromagnetic assembly, and the electromagnetic assembly, the wiring terminal and the tripping mechanism are all disposed in the housing;

an arc extinguishing assembly is further arranged in the shell, a socket is arranged on the shell at the lower part of the arc extinguishing assembly, and the shell is connected with an external motherboard through the socket.

The utility model has the advantages that:

the utility model optimizes the electromagnet structure to form a new double-actuating electromagnetic tripping system combination form of 'attraction of the movable iron core and the static iron core' and 'clapping of the yoke iron frame and the armature sheet', thereby forming stronger electromagnetic force; the principle of electromagnetic force generated by the electrified solenoid is utilized, the armature sheet is attracted to push the trip rod of the mechanism, and finally external equipment such as a circuit breaker mechanism is driven to trip, so that the breaking effect of small volume and large thrust is achieved.

Drawings

Fig. 1 is an external schematic shaft side view of the entire circuit breaker in an embodiment of the invention;

fig. 2 is an external side view of the entire circuit breaker in an embodiment of the invention; wherein the region A is a region of the electromagnetic assembly;

fig. 3 is a schematic diagram of a top junction of the entire circuit breaker in an embodiment of the present invention;

fig. 4 is a schematic structural diagram of internal components of the embodiment of the present invention after removing a cover plate on one side of a circuit breaker housing;

fig. 5 is a schematic axial view of an embodiment of the present invention, after a cover plate on one side of a circuit breaker housing is removed;

FIG. 6 is a schematic axial view of the entire electromagnet of an embodiment of the present invention after assembly;

FIG. 7 is a schematic axial view of the entire electromagnet of an embodiment of the present invention after assembly;

fig. 8 is a side view of the entire electromagnet in the embodiment of the present invention when assembled;

figure 9 is a schematic cross-sectional view of figure 8 taken along section line a-a of the present invention;

fig. 10 is a schematic plan view of the electromagnetic assembly and the trip mechanism of the present invention after being detached separately;

fig. 11 is a schematic side view of the electromagnetic assembly and the tripping mechanism of the present invention after being detached separately.

In the figure: 1-yoke iron frame, 2-coil, 3-armature sheet, 3.1-pressure head, 3.2-rotation end, 4-sleeve, 4.1-rotation seat, 5-static iron core, 6-movable iron core, 6.1-pushing head, 6.2-main body, 7-shell, 8-outlet, 9-operation port, 10-handle, 11-socket, 12-driving part, 13-rotation handle, 13.1-sliding groove, 14-lock catch, 15-arc extinguishing component, 16-connecting terminal, 16.1-fixing bolt, 17-A rod piece and 18-B rod piece.

Detailed Description

The present invention will be further explained with reference to the drawings and the embodiments.

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present application, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are used for indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship which is usually placed when the product of the application is used, the description is only for convenience and simplicity, and the indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation and be operated, and thus, should not be construed as limiting the present application. Furthermore, the appearances of the terms "first," "second," and the like in the description herein are only used for distinguishing between similar elements and are not intended to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like when used in the description of the present application do not require that the components be absolutely horizontal or overhanging, but may be slightly inclined. For example, "horizontal" merely means that the 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 otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" should be interpreted broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

Example 1:

the embodiment discloses a circuit breaker structure, as shown in fig. 1-3, but this circuit breaker is for arranging the formula of inserting quick replacement structure, and is different with current circuit breaker, and this circuit breaker afterbody has socket 11, and this socket 11 is pegged graft with the female cooperation of arranging of outside to connect and correspond the circuit, and only reserve on this circuit breaker outside terminal surface and have outlet 8, the outside cable of being convenient for arranges regularly more.

In order to realize that the external end face of the circuit breaker is simultaneously provided with the outlet 8 and the operation port 9 for clamping the wire head in the outlet 8, a connecting terminal 16 with larger volume is arranged at the position close to the external end face in the circuit breaker, and the connecting terminal 16 occupies a certain space, so that the installation space of other internal functional modules is influenced.

Then the utility model provides a circuit breaker is for the adjustment of adaptation this circuit breaker inner space, then adjusts the electromagnetic component and the dropout subassembly position that are equipped with to the inside. Preferably, in the picture orientation shown in fig. 1 in this embodiment, the electromagnetic assembly is vertically arranged, and this kind of structural design can overcome this circuit breaker because of the not enough problem of horizontal width, simultaneously after optimizing tripping device's mounted position, can realize stably tripping equally.

However, in order to achieve the effect of lateral pushing, the electromagnetic assembly of this embodiment includes two actuating portions, and the two actuating portions are actuated by magnetic force in the same direction, and one of the actuating portions pushes the trip mechanism to actuate. In order to adapt to a smaller installation space, the electromagnetic assembly is ensured to have better breaking capacity on the premise of volume reduction or volume reduction of the tripping mechanism, so that another action part is additionally arranged on the basis of the existing structure of the original single action part, and therefore the electromagnet can generate larger pushing force when the same current passes through, and the larger pushing force is the premise of ensuring stable breaking of the tripping mechanism. The structural design of the double-power part comprises various implementation modes, wherein the most important mode is to optimize on the basis of the existing electromagnetic assembly structure.

When the coil 2 receives abnormal current, the two power parts in the effective magnetic field of the coil 2 act simultaneously, the two acting forces can be mutually superposed through a proper transmission connection mode, and any one of the two power parts is matched with the tripping mechanism to trip.

Further, one of the actuating portions includes a yoke 1 and an armature plate 3, the armature plate 3 is a rotating member, and the armature plate 3 is rotated toward the yoke 1 by a magnetic field generated by a coil 2 provided inside the yoke 1. The coil 2 and one of the power parts are arranged in the yoke iron frame 1, and two ends of the coil 2 extend out of the connecting ends to be connected with an external circuit. The armature pieces 3 are arranged by utilizing the special structure of the yoke iron frame 1, the closed side of the original yoke iron frame 1 is arranged as an opening, and the armature pieces 3 belonging to the rotating part are arranged at the opening, so that when a magnetic field is arranged in the armature pieces 3, the armature pieces 3 have the tendency of rotating and slapping towards the yoke iron frame 1. And the other action part comprises a static iron core 5 and a movable iron core 6 which are both arranged in the coil 2, the end part of the movable iron core 6 is provided with a push head 6.1, and the end part of the push head 6.1 is in transmission connection with the armature sheet 3.

As shown in fig. 6-9, fig. 7 shows that the present embodiment is an optimized improvement on the conventional electromagnet, and the conventional electromagnet comprises, from outside to inside, a yoke 1, a coil 2, a sleeve 4, a movable iron core 6 and a stationary iron core 5.

The electromagnet is arranged in a novel circuit breaker, A in the drawing indicates a specific position of the electromagnet, a wiring terminal 16 is arranged on the upper portion of the electromagnet, a fixing bolt 16.1 for line pressing adjustment is arranged outside the wiring terminal 16, and a tripping mechanism is arranged on one side of the wiring terminal. It can also be seen that the internal space of the novel circuit breaker structure is different from that of the existing circuit breaker, and due to the slender structural design, too many action parts cannot be arranged in the width direction. However, since the size of the coil 2 of the electromagnetic assembly determines the overall volume of the structure, and the coil 2 is the power source of the structure, the structure of the structure needs to be optimized, so that the electromagnetic assembly with a large breaking force is arranged in a limited installation space. In order to avoid increasing the extra structure and increasing the volume of the whole electromagnet, the electromagnet in the embodiment optimizes the original structure of the closed yoke iron frame 1 into a fixed structure with an opening, the inner sleeve 4 extends out of the yoke iron frame 1 and is provided with a rotary seat 4.1 at the opening, and the rotary seat 4.1 and a rotary shaft arranged in the rotary seat 4.1 are rotatably connected with an armature sheet 3 arranged in the rotary seat.

One end of the armature sheet 3 is a rotating end 3.2, the other side is a pressing head 3.1 with a sheet structure, and a through groove is arranged in the middle of the pressing head 3.1. And the movable iron core 6 comprises a main body 6.2 and a push head 6.1 arranged at the end part, penetrates through the through groove, and is provided with an expansion end at one penetrating side. When the push head 6.1 contracts inwards, the width of the through groove is smaller than the maximum width of the expansion end, and the push head 6.1 drives the armature sheet 3 to rotate. At this time, since the second actuating member is formed between the yoke 1 and the armature plate 3, the armature plate 3 tends to rotate toward the yoke 1 side after approaching gradually, thereby achieving the superposition of the force in cooperation with the moving core 6.

In this embodiment, the armature plate 3 is far away from the side of the rotation connection and extends out to be matched with the lock catch 14 of the tripping mechanism, when the current in the coil 2 exceeds a certain threshold value, the movable iron core 6 overcomes the spring resistance to attract inwards, and the armature plate 3 also has the trend of inwards rotating, so that the armature plate 3 is flapped on the lock catch 14 by the protruding part at one end after rotating, the lock catch 14 is pushed to lose the locking limiting effect, and the whole tripping mechanism is pulled towards the tripping side by the internal spring force, so that the short circuit tripping process is completed.

Example 2:

in this embodiment, the trip mechanism is disposed on one side of the electromagnetic assembly inside the circuit breaker housing 7, the connection terminal 16 is disposed on the upper portion, and the arc extinguishing assembly 15 is disposed on the lower portion.

The trip mechanism is shown in fig. 4, 5, 10 and 11 and comprises a plurality of components, wherein the handle 10, the transmission piece 12, the rotating handle 13 and the lock catch 14 arranged on the rotating handle 13 are arranged from top to bottom. The bottom end of the rotating handle 13 is a movable contact which is matched with a static contact arranged at the lower part of the electromagnetic component to realize conduction control.

The lock catch 14 is a rotating structure with a rotating point in the middle, one end of the rotating point is provided with a stop head used for limiting the action of the rotating handle 13, the other end of the rotating point is provided with a racket head matched with an action part in the electromagnetic assembly, and the action part pushes the racket head to act after acting and drives the whole lock catch 14 to rotate to remove the limitation.

The tripping mechanism also comprises an operating assembly, and the operating assembly is in transmission connection with the rotating handle 13 through an A rod member 17; the rotating handle 13 is provided with a sliding groove 13.1 at one end far away from the movable contact, one end of the A rod piece 17 slides in the sliding groove 13.1, and when the movable contact is in contact with the fixed contact, the stopper rotates to one side of the sliding groove 13.1 and limits the end part of the rod piece at one end of the sliding groove 13.1. The operating assembly comprises a handle 10 and a transmission piece 12 which are of rotating structures, wherein the handle 10 and the transmission piece 12 are in transmission connection through a B rod 18.

The present invention is not limited to the above-mentioned alternative embodiments, and various other products can be obtained by anyone under the teaching of the present invention. The above detailed description should not be taken as limiting the scope of the invention, which is defined in the following claims, and which can be used to interpret the claims.

Claims (10)

1. The utility model provides a board formula circuit breaker of inserting, pegs graft on the motherboard and from outside terminal surface inlet wire formation protection circuit, inside has electromagnetic component, binding post (16) and tripping device, its characterized in that: the electromagnetic assembly is provided with two action parts, the two action parts are in the same direction under the action of magnetic force, and one action part pushes the tripping mechanism to act.

2. A board plug-in circuit breaker according to claim 1, characterized in that: one action part comprises a yoke iron frame (1) and an armature sheet (3), the armature sheet (3) is a rotating part, and a coil (2) arranged in the yoke iron frame (1) generates a magnetic field to enable the armature sheet (3) to rotate towards the direction of the yoke iron frame (1).

3. A board plug-in circuit breaker according to claim 2, characterized in that: the other action part comprises a static iron core (5) and a movable iron core (6) which are arranged in the coil (2), wherein the end part of the movable iron core (6) is provided with a push head (6.1), and the end part of the push head (6.1) is in transmission connection with the armature plate (3).

4. A board plug-in circuit breaker according to claim 3, characterized in that: the magnetic suspension type magnetic suspension motor further comprises a sleeve (4), wherein the movable iron core (6) and the static iron core (5) are arranged in the sleeve (4);

a rotary seat (4.1) is arranged on one side of the end part of the sleeve (4) and is rotatably connected with a rotating end (3.2) of the armature sheet (3) through the rotary seat (4.1).

5. The board-to-board circuit breaker according to claim 4, characterized in that: the armature sheet (3) is provided with a gap, the pushing head (6.1) penetrates through the gap and is provided with an expansion end on one side far away from the static iron core (5), and the pulling force for buckling the armature sheet (3) to one side of the yoke iron frame (1) is given when the movable iron core (6) is magnetized.

6. A board plug-in type circuit breaker according to any one of claims 1-5, characterized in that: the tripping mechanism comprises a lock catch (14) and a rotating handle (13), and one end of the rotating handle (13) is provided with a movable contact which is in contact conduction with the electromagnetic assembly;

the lock catch (14) is arranged on the rotating handle (13) and limits the movement of the rotating handle (13) when the movable contact is contacted with the fixed contact in the breaker.

7. The board-to-board circuit breaker according to claim 6, characterized in that: the lock catch (14) is of a rotating structure with a rotating point in the middle, one end of the rotating point is provided with a stopper used for limiting the action of the rotating handle (13), the other end of the rotating point is provided with a racket head matched with one action part in the electromagnetic assembly, and the action part pushes the racket head to act after acting and drives the whole lock catch (14) to rotate to remove the limitation.

8. The board-to-board circuit breaker according to claim 7, characterized in that: the tripping mechanism also comprises an operating assembly, and the operating assembly is in transmission connection with the rotating handle (13) through an A rod piece (17);

the rotating handle (13) is provided with a sliding groove (13.1) at one end far away from the movable contact, one end of the A rod piece (17) slides in the sliding groove (13.1), and when the movable contact is in contact with the fixed contact, the stopper rotates to one side of the sliding groove (13.1) and limits the end part of the rod piece at one end of the sliding groove (13.1).

9. The board-to-board circuit breaker according to claim 8, characterized in that: the operating assembly comprises a handle (10) and a transmission piece (12) which are of rotating structures, and the handle (10) and the transmission piece (12) are in transmission connection through a B rod piece (18).

10. The board-to-board circuit breaker according to claim 6, characterized in that: a shell (7) is arranged outside, and the electromagnetic assembly, the wiring terminal (16) and the tripping mechanism are all arranged in the shell (7);

an arc extinguishing assembly (15) is further arranged in the shell (7), a socket (11) is arranged on the shell (7) at the lower part of the arc extinguishing assembly (15), and the shell is connected with an external motherboard through the socket (11).

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