CN222483259U - Plug-in circuit breaker - Google Patents

Abstract

A plug-in circuit breaker includes a housing, one end of the housing is an operating end, the other end of the housing is provided with a wiring socket, a wiring terminal is arranged in the wiring socket, the wiring terminal includes a conductive bar and at least two terminal assemblies arranged side by side and spaced apart, two ends of each terminal assembly respectively form two elastic clamping ends, one end of the conductive bar is provided with at least two clamping parts arranged side by side and spaced apart, each clamping part is clamped by a clamping end of a terminal assembly. In the utility model, the clamping part of the conductive bar and the terminal assembly are both arranged side by side and spaced apart, which not only ensures the current carrying capacity but also reduces the temperature of the connection. In addition, the two clamping ends are respectively used for plugging with the conductive bar and the external conductor, and the plug-in and unplugging of one clamping end has little effect on the other clamping end, which is conducive to improving the wiring stability of the wiring terminal, thereby ensuring the safety of the circuit breaker.

Description

Plug-in circuit breaker

Technical Field

The utility model relates to the field of piezoelectric devices, in particular to a plug-in circuit breaker.

Background

A switching device is a device for closing and/or opening one or more circuits, and a plug-in circuit breaker is an important switching device capable of closing, carrying and opening a current under normal circuit conditions and capable of closing, carrying and opening a current under abnormal circuit conditions within a prescribed time, which is connected to the outside through an internal connection terminal.

The existing plug-in bridge type wiring terminal is usually a bus bar clamp and is provided with a clamping end, the clamping end is connected with an external conductive piece in a plug-in manner to realize electric connection, the other end of the wiring terminal far away from the clamping end is a connecting end, and the connecting end is connected with the conductive piece in the circuit breaker; secondly, the connection end is easy to deform due to repeated plugging and pulling, and wiring stability is affected; thirdly, when the wiring is plugged and unplugged, the deformation of the connecting end easily causes poor contact between the wiring terminal and the inside of the circuit breaker, and the normal circuit operation and the reliability and stability of equipment are affected; fourthly, the bus clamp is directly arranged on a wiring socket of the circuit breaker, more conductive parts are exposed in the external environment and are easily affected by external factors such as dust, moisture and the like, so that the problems of poor contact, short circuit and the like are caused, and fifthly, the temperature of the wiring terminal and the conductive plate connected to the wiring terminal is too high, so that the performance of other parts is easily affected.

Disclosure of Invention

The object of the present utility model is to overcome at least one of the drawbacks of the prior art and to provide a plug-in circuit breaker.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

The utility model provides a plug-in circuit breaker, which comprises a shell, wherein one end of the shell is an operation end, the other end of the shell is provided with a wiring socket, a wiring terminal is arranged in the wiring socket, the wiring terminal comprises a conductive bar and at least two terminal assemblies which are arranged side by side at intervals, two elastic clamping ends are respectively formed at two ends of each terminal assembly, at least two clamping parts which are arranged side by side at intervals are arranged at one end of the conductive bar, and each clamping part is respectively clamped by one clamping end of one terminal assembly.

Further, the terminal assembly comprises a support, a pair of elastic sheets are arranged on the support at intervals, a clamping piece is arranged between the pair of elastic sheets, two elastic clamping ends are respectively formed at two ends of the clamping piece, a clamping gap for inserting a clamping part is reserved at each clamping end, and one side, opposite to the clamping gap, of each clamping end is respectively connected with the adjacent elastic sheet.

Further, the clamping piece comprises two clamping pieces arranged at intervals, the middle parts of the two clamping pieces are respectively matched with the bracket to form a first supporting point, and the gap between the two clamping pieces corresponding to the first supporting point is minimum, so that the same end of the two clamping pieces and the gap between the same end form a clamping end, and one clamping end is matched with the clamping part to form a second supporting point.

Further, a limit structure matched with each other is arranged between the clamping part and the clamping end, the limit structure comprises a limit groove and a limit bulge matched with each other, the limit groove is arranged on the clamping end and/or the clamping part, the limit bulge is arranged on the clamping part and/or the clamping end,

The contact surface of the limiting groove and the limiting protrusion is an arc surface, so that the limiting protrusion rotates in the limiting groove to form a second supporting point of the clamping end and the clamping part.

Further, the conducting bar comprises a plate-shaped body, the middle part of the plate-shaped body is bent at least once, the first end and the second end of the plate-shaped body are respectively located on two planes which are parallel to each other, the width of the first end of the plate-shaped body is larger than that of the second end of the plate-shaped body, the first end of the plate-shaped body is divided into at least two clamping parts which are arranged side by side at intervals, the middle part of at least one side surface of each clamping part protrudes to form an arc-shaped limiting protrusion, and the second end of the plate-shaped body is provided with at least one fixing hole.

Further, be provided with the inner shell in the shell, be provided with the contact mechanism of electricity connection on binding post in the inner shell, the lateral wall of inner shell one end is equipped with the terminal mounting groove, every terminal mounting groove is used for setting up a binding post with the binding post is corresponding.

Further, a wiring cavity is arranged between the outer side wall of the inner shell and the inner side wall of the outer shell, and a terminal mounting groove is formed in the area, close to the wiring socket, of the wiring cavity.

Further, a contact mechanism is arranged inside the inner shell, one end, far away from the terminal assembly, of the conducting bar is connected with a conducting plate, and the conducting plate is arranged along the wiring cavity and penetrates through the inner shell to be electrically connected with the contact mechanism.

Further, the inside mutual inductor that still is provided with of inner shell, the mutual inductor is adjacent with the moving contact or the stationary contact of contact mechanism, the centre bore of mutual inductor is provided with the wiring row, the wiring row is connected between current-conducting plate and adjacent moving contact or stationary contact.

Further, a plurality of heat dissipation holes are formed in the side wall of the shell opposite to the conducting plate.

According to the plug-in circuit breaker, the clamping parts of the conducting bars and the terminal assemblies are of the structure which is arranged side by side and at intervals, so that the current-carrying capacity is guaranteed, the temperature of the connecting part can be reduced, in addition, the two clamping ends are respectively used for being plugged with the conducting bars and the external conductor, the plug-in wiring of one clamping end has small influence on the other clamping end, and the wiring stability of the wiring terminal is improved, so that the use safety of the circuit breaker is guaranteed.

In addition, the clamping piece is formed by two clamping pieces arranged at intervals, and the split structure is adopted to have low requirement on the elasticity of the clamping pieces, so that two fulcrums can be formed.

In addition, set up limit structure between conducting strip and the holder, prevent plug in-process conducting strip and holder separation, further promoted connection stability, especially, spacing recess and spacing bellied contact surface are the arcwall face, and spacing protruding rotation can form the second fulcrum in spacing recess.

In addition, one end of the conductive bar is divided into a plurality of clamping parts which are arranged at intervals, and two adjacent clamping parts are mutually separated, so that the integral temperature of one end of the conductive bar is reduced.

In addition, binding post sets up between inner shell and shell, separates binding post and other spare part in the circuit breaker utmost point, avoids binding post heat generation to influence other spare part performances.

In addition, the conducting plate connected between the transformer and the wiring terminal is arranged along the outer part of the inner shell, and the radiating holes are formed in positions corresponding to the conducting plate, so that the temperature reduction is facilitated, and the performance of other parts is prevented from being influenced by the high temperature of the conducting plate and the wiring terminal.

Drawings

FIG. 1 is a schematic view of the structure of a terminal of the present utility model;

FIG. 2 is an exploded view of the terminal of the present utility model;

FIG. 3 is an exploded view of the terminal assembly of the present utility model;

FIG. 4 is a schematic view of a pair of clamping grids according to the present utility model;

Fig. 5 is an exploded view of the plug-in circuit breaker of the present utility model;

FIG. 6 is a schematic view of the structure of the inner shell of the present utility model;

Reference numerals:

1-conducting bar, 11-clamping part, 12-limit bulge, 13-fixed hole, 2-terminal assembly, 211-supporting frame, 212-supporting shaft, 220-clamping grid 220,2201-first clamping section, 2202-second clamping section, 2203-straight section, 221-first clamping end, 222-second clamping end, 223-limit groove, 224-assembly groove, 23-spring piece, 311-first end cover, 312-second end cover, 313-first side wall, 314-second side wall, 315-heat dissipation hole, 32-inner shell, 321-terminal mounting groove, 322-wiring cavity.

Detailed Description

Embodiments of the plug-in circuit breaker of the present utility model are further described below with reference to the examples given in the accompanying drawings. The plug-in circuit breaker of the present utility model is not limited to the description of the following embodiments.

The plug-in circuit breaker comprises a shell, wherein an operating mechanism and at least one circuit breaker pole are arranged in the shell, each circuit breaker pole comprises a pair of wiring terminals and a contact mechanism connected between the wiring terminals, one end of the shell is used as an operating end, the operating end is provided with an operating hole, an operating piece connected to the operating mechanism stretches out of the shell from the operating hole, a wiring socket is arranged at the other end of the shell, the wiring terminals are assembled in the wiring socket and are connected with an external conductor in an inserting mode through the plug-in circuit breaker, the contact mechanism comprises a moving contact and a fixed contact which are matched with each other, the moving contact is connected with the operating mechanism, and the operating mechanism drives the moving contact to contact with or separate from the fixed contact, so that a main circuit of each circuit breaker pole is connected or disconnected.

The improvement point of the application is that the wiring terminal comprises a conductive bar 1 and at least two terminal assemblies 2 which are arranged side by side and at intervals, two elastic clamping ends are respectively formed at two ends of each terminal assembly 2, at least two clamping parts 11 which are arranged side by side and at intervals are arranged at one end of the conductive bar 1, each clamping part 11 is respectively clamped by one clamping end of one terminal assembly 2, and the other clamping end far away from the conductive bar 1 is used for being connected with an external conductor.

So, clamping part 11 and terminal assembly 2 of electric lead 1 are the structure that just sets up side by side and interval, have both guaranteed the current-carrying capacity, can reduce the temperature of junction again, in addition, two clamping ends are used for pegging graft with electric lead 1, outer conductor respectively, and the plug wiring of one of them clamping end is less to the influence of another clamping end, does benefit to the wiring stability that promotes binding post to guarantee the safety in utilization of circuit breaker.

Specifically, the terminal assembly 2 includes a bracket, a pair of elastic pieces 23 are arranged at intervals on the bracket, a clamping piece is arranged between the pair of elastic pieces 23, two ends of the clamping piece respectively form two elastic clamping ends, a clamping gap for inserting the clamping part 11 is reserved at each clamping end, and one side of each clamping end opposite to the clamping gap is respectively connected with the adjacent elastic pieces 23, so that elastic clamping ends are formed.

Further, the clamping piece can be made of elastic materials, the structure of the clamping piece can be of a split structure, the clamping piece comprises two clamping pieces arranged at intervals, the clamping pieces are preferably of a plate-shaped structure with a certain bending degree, the middle parts of the two clamping pieces are respectively matched with the support to form a first supporting point, a gap between the two clamping pieces corresponding to the first supporting point is minimum, the same end of the two clamping pieces and the gap between the same end form a clamping end, one clamping end is matched with the clamping part 11 to form a second supporting point, when the clamping part 11 of the conductive bar 1 is inserted into the clamping end, the two clamping pieces rotate around the first supporting point, and when an external conductor is inserted into the other clamping end, the two clamping pieces rotate around the second supporting point, so that the conductive bar 1 or the external conductive piece is clamped by the clamping end conveniently. Of course, the clamping piece can be of an integral structure, namely the clamping piece is formed by connecting two U-shaped clamps, the opening of each U-shaped clamp can be used as a clamping end, one ends of the two U-shaped clamps back to the opening are connected together, the openings of the two U-shaped clamps back to each other, and the clamping piece of the integral structure is easier to assemble on the support.

Preferably, a limit structure matched with each other is arranged between the clamping end and the conductive bar 1, the limit structure comprises a limit groove 223 and a limit protrusion 12 which are limited by each other, wherein the limit groove 223 can be arranged on the clamping piece and/or the conductive bar 1, the limit protrusion 12 is arranged on the conductive bar 1 and/or the clamping piece, the contact surfaces of the limit groove 223 and the limit protrusion 12 are arc surfaces, so that the limit protrusion 12 can rotate in the limit groove 223, and the limit protrusion 12 and the limit groove 223 can be matched to form a second pivot of the clamping end and the clamping part 11, and the arc surfaces can also prevent mutual abrasion in the plugging process.

A specific terminal structure is provided in connection with fig. 1-4.

As shown in fig. 1-3, the wiring terminal includes a conductive strip 1 and three terminal assemblies 2 having the same structure and being arranged at intervals side by side, one end of the conductive strip 1 is simultaneously inserted into the three terminal assemblies 2, that is, one end of the conductive strip 1 is provided with three clamping portions 11 arranged at intervals side by side, each clamping portion 11 is connected with a clamping end of one terminal assembly 2, the intervals between the clamping portions 11 and the intervals between the terminal assemblies 2 are beneficial to reducing the temperature of the connection part, and one end of the three terminal assemblies 2 far away from the conductive strip 1 corresponds to one wiring socket formed on the housing together.

In connection with fig. 2, there is provided a specific structure of a conductive bar 1, the conductive bar 1 includes a plate-shaped body, the middle portion of the plate-shaped body is bent at least once, so that a first end and a second end of the plate-shaped body are respectively located on two planes parallel to each other, in the figure, the width of the first end of the plate-shaped body is larger than that of the second end of the plate-shaped body, that is, the width of the first end of the plate-shaped body is equal to the total width of three terminal assemblies 2, the first end of the plate-shaped body is divided into three clamping portions 11 arranged side by side, the three clamping portions 11 are separated from each other, the overall temperature of one end of the conductive bar 1 is reduced, the middle portion of a plate surface of at least one side of each clamping portion 11 protrudes to form an arc-shaped limit protrusion 12, and the second end of the plate-shaped body is provided with at least one fixing hole 13, and a fastener is arranged in the fixing hole 13 for being fixedly connected with a conductive piece inside a circuit breaker.

Referring to fig. 2-4, a specific structure of a terminal assembly 2 is provided, each terminal assembly 2 includes a bracket, a clamping member and a pair of elastic pieces 23, the pair of elastic pieces 23 are disposed on the bracket and are opposite to each other at intervals, the clamping member is disposed between the pair of elastic pieces 23, the middle part of the clamping member is rotationally connected with the bracket, two ends of the clamping member respectively form two clamping ends, a clamping gap is reserved at each clamping end, one clamping gap is used for being inserted into one clamping part 11 of the conductive bar 1, and the other clamping gap is used for being connected with a conductive piece outside the circuit breaker.

As shown in fig. 3, the bracket includes two pairs of supporting walls arranged at intervals, two pairs of supporting walls are sequentially connected end to form a supporting frame 211 with a quadrangular hollow area in the middle, edges of one pair of supporting walls extend outwards to form an extending wall, a supporting shaft 212 is connected between the two extending arms, a pair of elastic pieces 23 penetrate through the hollow area, when the elastic pieces 23 deform, one side of each elastic piece 23 opposite to the supporting shaft 212 is abutted against one supporting wall, the supporting shaft 212 is positioned between the pair of elastic pieces 23, the supporting shaft 212 is parallel to a plane where the elastic pieces 23 are positioned, a clamping piece penetrates through the hollow area and is matched with the supporting shaft 212, two clamping ends of the clamping piece extend out of two sides of the supporting frame 211 respectively, and the end of each clamping end is connected with the pair of elastic pieces 23 respectively, so that the elastic pieces 23 provide elastic force for the clamping ends.

As shown in fig. 2-4, the clamping member includes two clamping pieces arranged at intervals, the middle parts of the two clamping pieces are respectively matched with the bracket to form a first supporting point, and the gap between the two clamping pieces corresponding to the first supporting point is minimized, so that the same ends of the two clamping pieces and the gap between the same ends form clamping ends, and one clamping end is matched with the clamping part 11 to form a second supporting point.

In this embodiment, each clamping sheet is formed by a plurality of clamping grid sheets 220 arranged side by side, in fig. 4, the plate surfaces of two adjacent clamping grid sheets 220 are mutually attached, each clamping grid sheet 220 includes two clamping sections and a straight section 2203 connected between the two clamping sections, for convenience in description, the two clamping sections are a first clamping section 2201 and a second clamping section 2202 respectively, a first groove is formed at the edge of the straight section 2203, in fig. 4, the first groove is closer to the second clamping section 2202, a second groove is formed at the edge of the joint of the straight section 2203 and at least one clamping section, and in fig. 4, the second groove is located at the joint of the straight section 2203 and the first clamping section 2201.

When the two clamping grid plates 220 are opposite, the gap between the two flat sections 2203 is the smallest, so that the smallest gap between the middle parts of the two clamping plates is correspondingly formed, the two first grooves are opposite to form the assembling groove 224, the supporting shaft 212 is arranged in the assembling groove 224, so that the middle part of each clamping grid plate 220 (clamping plate) can rotate around the supporting shaft 212, that is, the middle part of each clamping plate is matched with the bracket to form a first pivot, the two clamping sections opposite to each other at intervals and the gap between the two clamping sections form one clamping end, that is, the two first clamping sections 2201 and the gap between the two first clamping sections 2201 form a first clamping end 221, the first clamping end 221 is provided with a first clamping gap, the first clamping gap is used for being inserted with the clamping part 11 of the conducting bar 1, the two second grooves are opposite to form a limiting groove 223, the limiting groove 223 is matched with the limiting boss 12 of the clamping part 11 to promote connection stability, meanwhile, the contact surface of the limiting groove 223 and the limiting boss 12 is a surface, that is matched with the two first clamping sections 2202 and the second clamping section 2202 can form a second clamping end 222 and a second clamping end with the second clamping end 222, and a second clamping end 222 is formed between the two clamping ends.

In this embodiment, the ends of the first clamping section 2201 and the second clamping section 2202 are respectively deflected towards the direction close to the elastic sheet 23, so that the opening degree of the first clamping end 221 and the second clamping end 222 can be increased, the conductive strip 1 and the external conductive member can be conveniently inserted, and meanwhile, the connection with the end of the elastic sheet 23 is facilitated, so that a deformation space is reserved between the elastic sheet 23 and the clamping member. It should be noted that the clamping piece may be a plate structure.

The structure (not shown) of another clamping piece is provided, the clamping piece comprises two U-shaped clamps, one ends of the U-shaped clamps are provided with openings, the other ends of the U-shaped clamps are connecting ends, the connecting ends of the two U-shaped clamps are connected together to form an integrated structure, an assembling groove 224 for assembling the supporting shaft 212 is formed in the connecting position of the two connecting ends, the opening of each U-shaped clamp is used as a clamping end, and a mutually matched limiting structure can be arranged between one clamping end and the conducting bar 1.

As shown in fig. 1-3, each elastic piece 23 is in a plate-shaped structure, a plurality of spaced slits are formed at the edges of two ends of each elastic piece 23, so that two ends of each elastic piece 23 form a comb shape, the ends of the comb shape are connected with the clamping ends, a certain space is reserved between each elastic piece 23 and the clamping piece, and the middle part of each elastic piece 23 can move towards the direction close to the clamping piece to generate deformation.

As shown in fig. 5 and 6, the plug-in circuit breaker comprises a housing, an operating mechanism and at least one circuit breaker pole are arranged in the housing, one end of the housing is used as an operating end, preferably, the other end of the housing opposite to the operating end is a wiring terminal, the wiring terminal is provided with at least one pair of wiring sockets, each circuit breaker pole comprises a pair of wiring terminals, each wiring terminal is arranged inside the housing, one clamping end part of each wiring terminal far away from the conductive bar 1 is abutted against the inner side wall of the housing provided with the wiring sockets, and thus, the wiring terminals are completely arranged in the housing, so that excessive exposure to the external environment can be avoided, and the problems of poor contact or short circuit and the like caused by the influence of dust, moisture and other factors are avoided.

In this embodiment, an inner housing 32 is disposed in the outer housing, the circuit breaker pole is disposed in the inner housing 32, a terminal mounting groove 321 is disposed on an outer sidewall of one end of the inner housing 32, each terminal mounting groove 321 corresponds to one of the connection sockets for providing one of the connection terminals, wherein one end of the conductive strip 1 far away from the terminal assembly 2 passes through the inner housing 32 to be electrically connected with the contact mechanism, that is, a hole for electrically connecting the conductive strip 1 with the contact mechanism is provided on a sidewall of the inner housing 32.

Specifically, the outer housing includes a first end cap 311 and a second end cap 312 disposed at intervals, the first end cap 311 and the second end cap 312 serve as an operation end and a terminal of the outer housing, two pairs of side walls are disposed between the first end cap 311 and the second end cap 312, one pair of side walls is a first side wall 313, the other pair of side walls is a second side wall 314, as shown in fig. 6, wiring cavities 322 are disposed between an outer side wall of the inner housing 32 and an inner side wall of the outer housing, the wiring cavities 322 may be distributed on all outer side walls of the inner housing 32, one outer side wall of the inner housing 32 may be provided with one or two and more than two wiring cavities 322, in fig. 6, a plurality of partitions disposed at intervals are disposed on an outer side wall of the inner housing 32, a chamber is formed between two adjacent partitions, each chamber cooperates with the first side wall 313 or the second side wall 314 of the outer housing to form one wiring cavity 322, and a terminal mounting groove 321 is formed by a region of the wiring cavity 322 close to the wiring socket.

In this embodiment, the second end of the conductive bar 1 may be fixedly connected to a conductive plate inside the housing, for example, a contact mechanism is electrically connected between a pair of terminals, the contact mechanism includes a moving contact and a fixed contact that are mated with each other, and the conductive plate connected between the contact mechanism and the conductive bar 1 is disposed along the wiring cavity 322.

Each circuit breaker pole is also provided with a mutual inductor, the mutual inductor is adjacent to a moving contact or a fixed contact in a contact mechanism, a wiring row is arranged in a central hole of the mutual inductor, and the wiring row connects the adjacent moving contact or fixed contact with a conductive plate, so that the conductive plate with higher heat generation and a wiring terminal are arranged outside an inner shell 32, the product performance is avoided from being influenced by high temperature, one end of the conductive plate far away from the conductive row 1 can penetrate through the inner shell 32 to be connected with the contact mechanism, and further, a plurality of heat dissipation holes 315 are formed in the side wall of the outer shell opposite to the conductive plate, so that the temperature of the wiring terminal and the conductive plate is reduced.

Other structures such as an arc extinguishing system, a short-circuit protection mechanism, an overload protection mechanism, etc. can be arranged inside each breaker pole, that is, the breaker pole can be used for the rest part except the wiring terminal.

It should be noted that, in the description of the present utility model, the terms "upper", "lower", "left", "right", "inner", "outer", and the like indicate an orientation or a positional relationship based on that shown in the drawings or an orientation or a positional relationship conventionally put in use, and are merely for convenience of description, and do not indicate that the apparatus or element to be referred to must have a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating relative importance.

The foregoing is a further detailed description of the utility model in connection with the preferred embodiments, and it is not intended that the utility model be limited to the specific embodiments described. It will be apparent to those skilled in the art that several simple deductions or substitutions may be made without departing from the spirit of the utility model, and these should be considered to be within the scope of the utility model.

Claims (10)

1. The plug-in circuit breaker comprises a shell, one end of the shell is an operation end, the other end of the shell is provided with a wiring socket, and a wiring terminal is arranged in the wiring socket and is characterized in that the wiring terminal comprises a conductive bar (1) and at least two terminal assemblies (2) which are arranged side by side and at intervals, two elastic clamping ends are respectively formed at two ends of each terminal assembly (2), at least two clamping parts (11) which are arranged side by side and at intervals are arranged at one end of the conductive bar (1), and each clamping part (11) is respectively clamped by one clamping end of one terminal assembly (2).

2. The plug-in circuit breaker according to claim 1, wherein the terminal assembly (2) comprises a bracket, a pair of elastic pieces (23) are arranged on the bracket at intervals, clamping pieces are arranged between the pair of elastic pieces (23), two elastic clamping ends are respectively formed at two ends of the clamping pieces, a clamping gap for inserting the clamping part (11) is reserved at each clamping end, and one side of each clamping end opposite to the clamping gap is respectively connected with the adjacent elastic piece (23).

3. The plug-in circuit breaker according to claim 2, wherein the clamping member comprises two clamping pieces arranged at intervals, the middle parts of the two clamping pieces are respectively matched with the bracket to form a first pivot, and a gap between the two clamping pieces corresponding to the first pivot is minimized, so that the same end of the two clamping pieces and the gap between the same end form a clamping end, and one clamping end is matched with the clamping part (11) to form a second pivot.

4. A plug-in circuit breaker according to claim 2 or 3, characterized in that a limit structure is arranged between the clamping part (11) and the clamping end, the limit structure comprises a limit groove (223) and a limit protrusion (12) which are mutually matched, the limit groove (223) is arranged on the clamping end and/or the clamping part (11), the limit protrusion (12) is arranged on the clamping part (11) and/or the clamping end,

The contact surface of the limiting groove (223) and the limiting protrusion (12) is an arc surface, so that the limiting protrusion (12) rotates in the limiting groove (223) to form a clamping end and a second supporting point of the clamping part (11).

5. The plug-in circuit breaker according to claim 1, wherein the conductive bar (1) comprises a plate-shaped body, the middle part of the plate-shaped body is bent at least once, the first end and the second end of the plate-shaped body are respectively positioned on two mutually parallel planes, the width of the first end of the plate-shaped body is larger than that of the second end of the plate-shaped body, the first end of the plate-shaped body is divided into at least two clamping parts (11) which are arranged side by side and at intervals, the middle part of at least one side plate surface of each clamping part (11) is protruded to form an arc-shaped limit protrusion (12), and the second end of the plate-shaped body is provided with at least one fixing hole (13).

6. The plug-in circuit breaker according to claim 1, wherein an inner housing (32) is disposed in the outer housing, a contact mechanism electrically connected to the connection terminal is disposed in the inner housing (32), a terminal mounting groove (321) is disposed on an outer sidewall of one end of the inner housing (32), and each terminal mounting groove (321) corresponds to a connection socket for disposing one connection terminal.

7. The circuit breaker according to claim 6, wherein a wiring cavity (322) is provided between an outer sidewall of the inner case (32) and an inner sidewall of the outer case, and a terminal mounting groove (321) is formed in a region of the wiring cavity (322) close to the wire insertion opening.

8. The circuit breaker according to claim 7, characterized in that the inner housing (32) is internally provided with contact means, and the end of the conductor bar (1) remote from the terminal assembly (2) is connected with a conductive plate, which is arranged along the wiring cavity (322) and is electrically connected with the contact means through the inner housing (32).

9. The circuit breaker according to any one of claims 6 to 8, characterized in that a transformer is further arranged inside the inner housing (32), the transformer being adjacent to the moving or stationary contact of the contact mechanism, the central hole of the transformer being provided with a wiring row connected between the conductive plate and the adjacent moving or stationary contact.

10. The circuit breaker according to claim 9, wherein a plurality of heat dissipation holes (315) are formed in a side wall of the housing opposite to the conductive plate.