CN216487890U

CN216487890U - Plug-in circuit breaker and locking mechanism

Info

Publication number: CN216487890U
Application number: CN202122211404.3U
Authority: CN
Inventors: 叶晨晖; 黄辉忠; 王景凯
Original assignee: Zhejiang Chint Electrics Co Ltd
Current assignee: Zhejiang Chint Electrics Co Ltd
Priority date: 2021-09-13
Filing date: 2021-09-13
Publication date: 2022-05-10
Anticipated expiration: 2031-09-13

Abstract

The utility model provides an insert circuit breaker and locking mechanical system, insert circuit breaker includes the shell, and the shell lateral wall is equipped with the draw-in groove with outside intercommunication, is equipped with locking mechanical system in the shell, locking mechanical system includes the locking piece and connects the elasticity afterbody at the locking piece tail end, be equipped with on the locking piece with draw-in groove complex sticking department, elasticity that the elasticity afterbody takes place deformation drives the locking piece and is close to or keep away from the shell lateral wall that is equipped with the draw-in groove, makes the sticking department stretch out the draw-in groove or retract the shell. The utility model provides a locking mechanical system, includes integrated into one piece's locking piece and elasticity afterbody, and the sticking department of locking piece is relative with the draw-in groove, and the head end of locking piece and the terminal and the cooperation of shell lateral wall of elasticity afterbody. The locking piece of the locking mechanism is connected with the elastic tail part together, so that the locking mechanism has the advantages of few parts, small occupied space and convenience in assembly, and is used for realizing the locking of the plug-in circuit breaker and the cabinet.

Description

Plug-in circuit breaker and locking mechanism

Technical Field

The utility model relates to a low-voltage apparatus, in particular to a plug-in circuit breaker and a locking mechanism.

Background

The use of circuit breaker can effectively improve the security of electrical apparatus, in order to satisfy different electrical equipment's installation needs, along with electrical equipment's miniaturized development trend, the overall structure and the operation mode of the circuit breaker of adaptation all need further upgrade.

The circuit connection can be realized when the working position of rack is gone into in current plug-in circuit breaker to the cartridge, if plug-in circuit breaker just can be pulled out the rack and can have great potential safety hazard when the combined floodgate state, consequently set up locking mechanical system usually on plug-in circuit breaker to prevent that the circuit breaker from being pulled out the rack under the combined floodgate state, however, current locking mechanical system exists the linkage complicacy, the part is various defects, especially contain the locking mechanical system of spring part, its assembly is comparatively loaded down with trivial details, and it is more to occupy the inner space.

Disclosure of Invention

The utility model aims to overcome the defects of the prior art and provide a plug-in circuit breaker and a locking mechanism, which are provided with the locking mechanism with simple structure, high reliability and small volume.

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

the utility model provides an insertion type circuit breaker, includes the shell, and the shell lateral wall is equipped with the draw-in groove with outside intercommunication, is equipped with locking mechanical system in the shell, locking mechanical system includes the locking piece and connects the elasticity afterbody at the locking piece tail end, be equipped with on the locking piece with draw-in groove complex sticking department, elasticity that the elasticity afterbody takes place deformation drives the locking piece and is close to or keeps away from the shell lateral wall that is equipped with the draw-in groove, makes the sticking department stretch out the draw-in groove or retract the shell.

Further, a button hole is formed in one end of the shell, an operating button is assembled in the button hole in a sliding mode, the clamping groove is formed in the side wall of the shell, the side wall of the shell is adjacent to the button hole, the circuit breaker is switched on or switched off by pressing or pulling the operating button, when the operating button drives the circuit breaker to be switched on, the operating button drives the locking piece to enable the locking portion to extend out of the clamping groove, and the elastic tail portion deforms; when the operating button drives the breaker to open the brake, the operating button is separated from the locking piece, and the elastic tail part drives the locking piece to enable the locking part to retract into the shell.

Further, the head end of the locking piece and the tail end of the elastic tail part are matched with the same shell side wall respectively, the head end of the locking part is matched with the shell in a rotating mode, the tail end of the locking part is provided with the elastic tail part, and the locking part is arranged on one side of the middle of the locking part in a protruding mode.

Further, the elastic tail part comprises an integrally formed curved rod, the curved rod is in a bent wave shape, the head end of the curved rod is connected with the tail end of the locking piece, and the tail end of the curved rod is rotatably connected with or abutted to the side wall of the shell.

Further, the locking member is integrally formed with the elastic tail portion.

Further, the tail end of the elastic tail part is in a blunt round shape, or the head end of the locking part is in a blunt round shape, or the head end is provided with a rotating shaft which is rotatably connected with the side wall of the shell.

Furthermore, the whole locking piece is of a straight rod shape, the length of the head end of the locking piece is larger than that of the tail end of the locking piece, the tail end of the locking piece is connected with the head end of the elastic tail portion, a groove structure is arranged in the middle of one side of the locking piece, a boss structure serving as a locking portion is arranged in the middle of the other side of the locking piece in a protruding mode, and smooth transition is adopted on one side of the locking portion, facing the head end of the locking piece, of the locking portion.

Furthermore, a limiting groove is arranged between the side wall of the shell provided with the clamping groove and the operating button, an opening of the limiting groove is used for a trigger part of the operating button to extend into, the head end of the locking piece and the tail end of the elastic tail part are respectively in limiting fit with the limiting groove, so that the locking piece and the elastic tail part are embedded in the limiting groove, and a locking part arranged on one side of the locking piece back to the operating button is opposite to the clamping groove; the limiting groove comprises a first side wall and a second side wall which are oppositely arranged, the first side wall is positioned on one side, away from the button hole, of the clamping groove and extends towards the direction of the button hole in an inclined mode, the second side wall is formed by a shell side wall, close to one side of the clamping groove, of the button hole, a notch is formed in the second side wall, and the notch and the shell side wall are matched with the tail end of the limiting elastic tail portion.

Furthermore, a triggering part is convexly arranged on one side of the operating button facing the clamping groove, and the triggering part is matched with the locking piece to enable the elastic tail part to generate elastic deformation; the trigger part is a conical protrusion arranged on the operating button, an inclined plane is arranged at the end part of one end, extending into the shell, of the operating button, and the inclined plane and one inclined side wall of the trigger part are connected in sequence to form a sliding plane.

Further, be equipped with the card that mutually supports between operating button and the button hole and keep off the structure, the card keeps off the structure and includes backstop portion and cooperation portion, backstop portion is located the button hole and leans on the inside wall of interior one end, and cooperation portion is located the one end tip that operating button stretched into the shell.

The utility model provides a locking mechanical system for with the draw-in groove cooperation of setting at the shell lateral wall, including integrated into one piece's locking piece and elasticity afterbody one side middle part protrusion of locking piece is equipped with draw-in groove complex sticking department, the elasticity afterbody includes bent shape pole, bent shape pole is crooked wave, bent shape pole's head end and the trailing end connection of locking piece, the head end of locking piece, bent shape pole's end are used for rotating with the shell lateral wall to be connected or to support and lean on the cooperation.

According to the plug-in circuit breaker and the locking mechanism, the locking piece of the locking piece mechanism is connected with the elastic tail part, so that the locking mechanism has the advantages of few parts, small occupied space and convenience in assembly, and is used for realizing the locking of the plug-in circuit breaker and a cabinet. In addition, when the operating button drives the breaker to switch on, the operating button drives the locking piece to enable the locking part to extend out of the clamping groove, and the elastic tail part deforms; the operation button is separated from the locking piece when driving the breaker to open the brake, and the elastic tail part drives the locking piece to enable the locking part to retract into the shell, so that the breaker cannot be inserted into or pulled out of the cabinet in a closing state, and the safety is improved.

In addition, the locking piece and the elastic tail part are integrally formed, so that the number of parts of the locking mechanism is further reduced, and the assembly is facilitated.

In addition, the locking piece links together and the head end through the locking piece and the terminal and the same shell lateral wall cooperation of elasticity afterbody, sets up the spacing groove that is used for inlaying and establishes locking piece and elasticity afterbody through the shell, makes locking piece and shell rotate through the pivot to be connected, also can support through spacing groove and shell and lean on the cooperation, and the connected mode of locking piece is more nimble.

Drawings

FIG. 1 is a schematic view of the locking mechanism of the present invention in a locked state;

FIG. 2 is a schematic view of the locking mechanism of the present invention in an unlocked state;

fig. 3 is a schematic structural view of the locking element and the elastic tail part of the present invention.

Detailed Description

The following description will further describe an embodiment of a plug-in circuit breaker and a locking mechanism according to the present invention with reference to the embodiments shown in fig. 1 to 3. A plug-in circuit breaker and a locking mechanism of the present invention are not limited to the description of the following embodiments.

The utility model provides an insertion type circuit breaker, includes

shell

1, and 1 lateral wall of shell is equipped with draw-in groove 12 with outside intercommunication, and 1 is equipped with locking mechanical system in the shell, locking mechanical system includes locking piece 3 and connects the elasticity afterbody 4 at the locking piece tail end, is equipped with on the locking piece 3 with draw-in groove 12 complex sticking portion 33, and elasticity that elasticity afterbody 4 took place deformation drives locking piece 3 to be close to or keep away from the 1 lateral wall of shell that is equipped with draw-in groove 12, makes sticking portion 33 stretch out draw-in groove 12 or withdraw shell 1.

According to the plug-in circuit breaker, the locking piece 3 is connected with the elastic tail part 4, so that the locking mechanism has the advantages of few parts, small occupied space and convenience in assembly, and is used for locking the plug-in circuit breaker and a cabinet.

An embodiment is provided with reference to fig. 1-3, the plug-in circuit breaker includes a housing 1, a button hole 11 is disposed at one end of the housing 1, an operation button 2 is slidably assembled in the button hole 11, the circuit breaker is switched on or off by pressing or pulling the operation button 2, a card slot 12 communicated with the outside is disposed on a side wall of the housing 1 adjacent to the button hole 11, a locking mechanism is assembled between the card slot 12 and the operation button 2, the locking mechanism includes a locking member 3 and an elastic tail portion 4 connected to a tail end 32 of the locking member 3, a head end 31 of the locking member 3 and a tail end of the elastic tail portion 4 are respectively engaged with a side wall of the same housing 1, a locking portion 33 engaged with the card slot 12 is disposed in a middle portion of the locking member 3, when the operation button 2 is switched on or off, the locking member 3 is pressed or separated from the locking member 3, the elastic tail portion 4 is deformed to drive the locking member 3 to approach or leave away from the side wall of the housing 1 having the card slot 12, thereby driving the locking portion 33 to extend out of the card slot 12 or retract into the housing 1.

Preferably, a button hole 11 is formed in one end of the housing 1, an operating button 2 is slidably assembled in the button hole 11, a clamping groove 12 is formed in the side wall of the housing 1 adjacent to the button hole 11, the circuit breaker is switched on or switched off by pressing or pulling the operating button 2, when the operating button 2 drives the circuit breaker to be switched on, the operating button 2 drives the locking part 3 to enable the locking part 33 to extend out of the clamping groove 12, and the elastic tail part 4 deforms; the operating button 2 is separated from the locking part 3 when driving the breaker to open the brake, and the elastic tail part 4 drives the locking part 3 to enable the locking part 33 to retract into the shell 1, so that the breaker cannot be inserted into or pulled out of a cabinet in a closing state, and the safety is improved.

The circuit breaker is characterized in that a pair of wiring terminals are arranged at two ends of the shell 1, an operating mechanism and a contact mechanism are arranged between the pair of wiring terminals, the operating mechanism is in linkage connection with a moving contact of the contact mechanism, a static contact of the contact mechanism is arranged in the middle of the shell 1, the moving contact and the static contact are respectively and electrically connected with one wiring terminal, the moving contact is driven by the operating mechanism to move towards a direction close to or far away from the static contact so as to realize opening and closing of the circuit breaker, and an arc extinguish chamber is arranged at one side of the contact mechanism and used for extinguishing electric arcs generated when the contact mechanism is opened and closed. The shell 1 is provided with a button hole 11, an operating button 2 is assembled in the button hole 11, the operating button 2 extends into the shell 1 to be linked with an operating mechanism, and manual opening and closing of the circuit breaker are achieved through operation of the operating button 2. Further, can also set up drive module and/or protection mechanism in the shell 1, drive module is connected with the automatic divide-shut brake of actuating mechanism linkage in order to drive circuit breaker, protection mechanism sets up in one side of actuating mechanism and cooperates with actuating mechanism, protection mechanism includes short-circuit protection mechanism and/or overload protection mechanism, when taking place short-circuit fault or overload fault, triggers operating mechanism dropout by protection mechanism, makes the circuit breaker outage.

As shown in fig. 1 and 2, a clamping groove 12 communicated with the outside is arranged on the side wall of the housing 1 adjacent to the button hole 11, a locking mechanism is arranged between the operating button 2 and the clamping groove 12, the locking mechanism comprises a locking piece 3 and an elastic tail part 4 connected to a tail end 32 of the locking piece 3, preferably, the locking piece 3 and the elastic tail part 4 are integrally formed, the number of parts is further reduced, the assembly is simplified, as shown in fig. 1 and 2, the locking piece 3 and the elastic tail part 4 are arranged close to the side wall provided with the clamping groove 12, a head end 31 of the locking piece 3 and a tail end of the elastic tail part 4 are respectively matched with the inner wall of the housing 1 at two sides of the clamping groove 12, a locking part 33 matched with the clamping groove 12 is arranged in the middle of one side of the locking piece 3 facing the clamping groove 12, a groove structure 34 matched with the operating button 2 is preferably arranged at one side of the locking piece 3 opposite to the clamping groove 12, correspondingly, a trigger part 21 matched with the groove structure 34 is arranged on the operating button 2, when pressing operating button 2 and closing a floodgate, operating button 2's trigger part 21 is pressed in the recess of locking piece 3, operating button 2's pressing makes elastic tail 4 take place elastic deformation and drives locking piece 3, make locking piece 3 and the laminating of shell 1 lateral wall, locking part 33 stretches out draw-in groove 12 and gets into the locking state, when drawing operating button 2 and carrying out the separating brake, operating button 2's trigger part 21 and recess structure 34 separation, elastic tail 4 reconversion drives locking piece 3 and the separation of shell 1 lateral wall, it is corresponding, get into the unblock state in the locking part 33 withdrawal shell 1.

In this embodiment, a position-limiting groove is provided between the side wall of the housing 1 provided with the card slot 12 and the operation button 2, the locking member 3 and the elastic tail portion 4 are engaged with the side wall of the housing 1 by being embedded in the position-limiting groove, the opening of the position-limiting groove faces one side of the operation button 2, so that the trigger portion 21 provided on the operation button 2 can extend into the position-limiting groove to press the locking member 3, the position-limiting groove includes a first side wall 13 and a second side wall 14 which are oppositely arranged, wherein the first side wall 13 is located at one side far from the button hole 11 and extends obliquely towards the button hole 11, so that an included angle is formed between the first side wall 13 and the side wall of the housing 1 provided with the card slot 12, the second side wall 14 is formed by the side wall of the button hole 11 close to one side of the card slot 12, a notch is provided on the second side wall 14, in this embodiment, the first side wall 13 is engaged with the side wall of the housing 1 to limit the head end 31 of the locking member 3, the notch and the side wall of the housing 1 are used for limiting the end of the elastic tail portion 4, and of course, the notch and the side wall of the housing 1 may be matched with the head end 31 of the limiting locking member 3, and the first side wall 13 and the side wall of the housing 1 are matched with the end of the limiting elastic tail portion 4.

Further, head end 31 of locking piece 3 can be provided with and be used for rotating the pivot of being connected with shell 1 lateral wall, so can do benefit to head end 31 of locking piece 3 and the rotation of shell 1 lateral wall to be connected, of course, the end of elasticity afterbody 4 also can rotate the pivot of being connected with shell 1 lateral wall, but there may be the end that disturbs elasticity afterbody 4 to rotate or be unfavorable for elasticity afterbody 4 to take place elastic deformation.

In this embodiment, the head end 31 of the locking piece 3 and the tail end of the elastic tail portion 4 are not connected with the side wall of the housing 1, and only the side wall of the housing 1 abuts against the limiting groove to be matched, when the operating button 2 presses the locking piece 3, the head end 31 of the locking piece 3 swings at the included angle between the first side wall 13 and the side wall of the housing 1, preferably, the included angle between the first side wall 13 and the side wall of the housing 1 is greater than or equal to the swing angle of the head end 31 of the locking piece 3, so as to prevent the locking portion 33 from being completely retracted into the housing 1, the tail end of the elastic tail portion 4 is limited between the notch and the side wall of the housing 1, and preferably, the head end 31 of the locking piece 3 and the tail end of the elastic tail portion 4 are both arranged to be blunt circles beneficial to rotation.

With reference to fig. 3, a specific structure of the locking member 3 is provided, wherein the head end 31 of the locking portion 33 is rotatably engaged with the housing 1, the tail end 32 is provided with the elastic tail portion 4, and the locking portion 33 is convexly provided at one side of the middle portion. The whole locking piece 3 is in a straight rod shape, the rod diameters of the head end 31 and the tail end 32 of the locking piece 3 are not completely the same, the end with the smaller rod diameter of the locking piece 3 is used as the head end 31 of the locking piece 3, wherein the end part of the head end 31 of the locking piece 3 is in a blunt round shape beneficial to rotation, a groove structure 34 is arranged in the middle of one side of the locking piece 3, the groove structure 34 faces the operating button 2, and the edge of the groove structure 34 and the side wall of the locking piece 3 adopt smooth transition to be beneficial to the extension or the removal of the trigger part 21 into or out of the groove structure 34; the opposite side protrusion of locking piece 3 is equipped with the boss structure as locking part 33, boss structure and operating button 2 are dorsad, and boss structure is just right with draw-in groove 12 promptly, boss structure separates locking piece 3 for longer head end 31 and shorter tail end 32, smooth transition is adopted to one side of locking part 33 towards the head end 31 of locking piece 3, and in fig. 1-3, locking part 33 and draw-in groove 12 one side edge complex terminal surface adopt the inclined plane of arc transition, and smooth transition is also adopted to locking part 33 and locking piece 3's lateral wall linking department, tail end 32 of locking piece 3 also establishes to be blunt circular, does benefit to tail end 32 and operating button 2 sliding fit of locking piece 3, and elasticity afterbody 4 is connected in the one side of tail end 32 towards draw-in groove 12.

Elasticity afterbody 4 includes integrated into one piece's bent shape pole, bent shape pole is crooked wave, and bent shape pole's head end is connected with the tail end 32 of locking piece 3, and bent shape pole's tail end and 1 inner wall normal running fit of shell, and bent shape pole's tail end is greater than the spherical portion of rod footpath for the diameter, perhaps, is equipped with the tail end of bent shape pole blunt circular shape also equally can. In addition, the elastic tail 4 may also adopt other structures. The elastic tail 4 and the locking piece 3 are integrally injection molded.

In this embodiment, operating button 2 is shaft-like structure, and the one end that operating button 2 stretches out shell 1 is equipped with the operating surface, and operating button 2 stretches into the one end in the shell 1 and is equipped with the inclined plane, the inclined plane is located towards one side of draw-in groove 12 operating button 2's lateral wall is equipped with the trigger part 21 that is used for pressing locking piece 3, trigger part 21 sets up in one side towards draw-in groove 12 for the protrusion, and preferred trigger part 21 is the toper arch, the inclined lateral wall of a toper arch is unanimous with the inclined plane inclination of operating button 2 tip to make both connect in the same direction and form the glide plane.

Further, be equipped with the card that mutually supports between operating button 2 and the button hole 11 and keep off the structure, the card keeps off the structure and includes backstop portion 15 and cooperation portion 22, backstop portion 15 is located the inside wall that button hole 11 leaned on interior one end, and cooperation portion 22 is located the one end tip that operating button 2 stretched into in shell 1, and cooperation portion 22 is located one side of operating button 2 back to draw-in groove 12 in fig. 1, 2, cooperation portion 22 is the boss of setting at operating button 2 tip, the boss is to the direction slope protrusion from draw-in groove 12 back.

When the operating button 2 is pressed to switch on, the tail end 32 of the locking piece 3 is in sliding fit with the sliding surface, so that the triggering part 21 slides into the groove structure 34 of the locking piece 3 to press the locking piece 3, the locking piece 3 attached to the first side wall 13 of the limiting groove moves towards the side wall of the shell 1 provided with the clamping groove 12, at the moment, the curved rod of the elastic tail part 4 contracts, and after the locking piece 3 is attached to the side wall of the shell 1 provided with the clamping groove 12, the locking part 33 extends out of the clamping groove 12 to enable the locking mechanism to enter a locking state; when the operation button 2 is pulled to perform opening, the triggering part 21 is moved out from the groove structure 34, and then the tail end 32 of the locking piece 3 is matched with the sliding surface of the operation button 2 until the locking piece 3 is separated from the operation button 2, and at the moment, the elastic tail part 4 releases elastic force to restore and drives the locking piece 3 to be far away from the side wall of the shell 1 provided with the clamping groove 12 until the head end 31 of the locking piece 3 is attached to the first side wall 13 of the limiting groove.

The utility model provides a locking mechanical system for with set up the cooperation at draw-in groove 12 of shell 1 lateral wall, including integrated into one piece's locking piece 3 and elasticity afterbody 4 one side middle part protrusion of locking piece 3 is equipped with the locking portion 33 relative with draw-in groove 12, and elasticity afterbody 4 is connected at the tail end 31 of locking piece 3, elasticity afterbody 4 includes integrated into one piece's bent shape pole, bent shape pole is crooked wave, and bent shape pole's head end is connected with the tail end 32 of locking piece 3, and the head end 31 of locking piece 3, bent shape pole's end rotate with shell 1 lateral wall and are connected or support and lean on the cooperation. The locking mechanism can be applied to equipment such as a plug-in circuit breaker, a connector and the like which are inserted into a cabinet, and has small volume and simple structure.

The foregoing is a more detailed description of the utility model in connection with specific preferred embodiments and it is not intended that the utility model be limited to these specific details. For those skilled in the art to which the utility model pertains, numerous simple deductions or substitutions may be made without departing from the spirit of the utility model, which shall be deemed to belong to the scope of the utility model.

Claims

1. The utility model provides a plug-in circuit breaker, includes shell (1), shell (1) lateral wall is equipped with draw-in groove (12) with outside intercommunication, is equipped with locking mechanical system, its characterized in that in shell (1): locking mechanical system includes locking piece (3) and connects elasticity afterbody (4) at locking piece (3) tail end (32), is equipped with on locking piece (3) with draw-in groove (12) complex sticking department (33), elasticity that elasticity afterbody (4) take place deformation drives locking piece (3) and is close to or keep away from shell (1) lateral wall that is equipped with draw-in groove (12), makes sticking department (33) stretch out draw-in groove (12) or retract shell (1).

2. A plug-in circuit breaker as claimed in claim 1, characterized in that: a button hole (11) is formed in one end of the shell (1), an operating button (2) is assembled in the button hole (11) in a sliding mode, the clamping groove (12) is formed in the side wall of the shell (1) adjacent to the button hole (11), the circuit breaker is switched on or switched off by pressing or pulling the operating button (2), when the circuit breaker is driven to be switched on by the operating button (2), the operating button (2) drives the locking piece (3) to enable the locking portion (33) to extend out of the clamping groove (12), and the elastic tail portion (4) deforms; the operating button (2) is separated from the locking piece (3) when the circuit breaker is driven to open, and the elastic tail part (4) drives the locking piece (3) to enable the locking part (33) to retract into the shell (1).

3. A plug-in circuit breaker as claimed in claim 1, characterized in that: head end (31) and the end of elasticity afterbody (4) of locking piece (3) cooperate with same shell (1) lateral wall respectively, sticking department (33) head end (31) and shell (1) normal running fit, tail end (32) are equipped with elasticity afterbody (4), middle part one side arch is equipped with sticking department (33).

4. A plug-in circuit breaker as claimed in claim 1, characterized in that: the elastic tail part (4) comprises an integrally formed curved rod, the curved rod is in a bent wave shape, the head end of the curved rod is connected with the tail end (32) of the locking piece (3), and the tail end of the curved rod is rotatably connected with or abutted against the side wall of the shell (1).

5. A plug-in circuit breaker according to any one of claims 1 to 4, characterized in that: the locking piece (3) and the elastic tail part (4) are integrally formed.

6. A plug-in circuit breaker as claimed in claim 1, characterized in that: the tail end of the elastic tail part (4) is blunt round, or the head end (31) of the locking part (3) is blunt round, or the head end (31) is provided with a rotating shaft which is rotatably connected with the side wall of the shell (1).

7. A plug-in circuit breaker as claimed in claim 1, characterized in that: locking piece (3) wholly is straight rod-shaped, and head end (31) length of locking piece (3) is greater than tail end (32) of locking piece (3), and tail end (32) of locking piece (3) are connected with the head end of elasticity afterbody (4), are equipped with groove structure (34) in one side middle part of locking piece (3), and the protrusion is equipped with the boss structure as sticking department (33) in the opposite side middle part of locking piece (3), smooth transition is adopted to one side that sticking department (33) are towards head end (31) of locking piece (3).

8. A plug-in circuit breaker as claimed in claim 2, characterized in that: a limiting groove is formed between the side wall of the shell (1) provided with the clamping groove (12) and the operating button (2), the opening of the limiting groove is used for the trigger part (21) of the operating button (2) to stretch into, the head end (31) of the locking piece (3) and the tail end of the elastic tail part (4) are respectively in limiting fit with the limiting groove, the locking piece (3) and the elastic tail part (4) are embedded in the limiting groove, and the locking part (33) arranged on one side of the locking piece (3) back to the operating button (2) is opposite to the clamping groove (12); the limiting groove comprises a first side wall (13) and a second side wall (14) which are oppositely arranged, the first side wall (13) is located on one side, away from the button hole (11), of the clamping groove (12) and extends in the direction of the button hole (11) in an inclined mode, the second side wall (14) is formed by the side wall, close to the clamping groove (12), of the shell (1) on one side of the button hole (11), a notch is formed in the second side wall (14), and the notch is matched with the side wall of the shell (1) to limit the tail end of the elastic tail portion (4).

9. A plug-in circuit breaker as claimed in claim 2, characterized in that: a trigger part (21) is convexly arranged on one side, facing the clamping groove (12), of the operating button (2), and the trigger part (21) is matched with the locking piece (3) to enable the elastic tail part (4) to be elastically deformed; trigger portion (21) are the toper arch of setting on operating button (2), and operating button (2) stretches into the one end tip in shell (1) and is equipped with the inclined plane, the inclined plane forms the glide plane with an oblique lateral wall of trigger portion (21) is in the same direction as connecing.

10. A plug-in circuit breaker as claimed in claim 2, characterized in that: be equipped with the card fender structure of mutually supporting between operating button (2) and button hole (11), card fender structure includes backstop portion (15) and cooperation portion (22), backstop portion (15) are located button hole (11) and lean on the inside wall of interior one end, and cooperation portion (22) are located operating button (2) and stretch into the one end tip in shell (1).

11. A locking mechanism for cooperation with a card slot (12) provided in a side wall of a housing (1), characterized in that: locking piece (3) and elasticity afterbody (4) including integrated into one piece one side middle part protrusion of locking piece (3) is equipped with draw-in groove (12) complex sticking department (33), elasticity afterbody (4) are including bent shape pole, bent shape pole is crooked wave, and the head end of bent shape pole is connected with tail end (32) of locking piece (3), and head end (31) of locking piece (3), the end of bent shape pole are used for rotating with shell (1) lateral wall to be connected or to support and lean on the cooperation.