CN111477504A

CN111477504A - Plug-in circuit breaker

Info

Publication number: CN111477504A
Application number: CN201911122574.5A
Authority: CN
Inventors: 葛伟骏; 卢科军; 朱俊
Original assignee: Zhejiang Chint Electrics Co Ltd
Current assignee: Zhejiang Chint Electrics Co Ltd
Priority date: 2019-11-15
Filing date: 2019-11-15
Publication date: 2020-07-31

Abstract

The invention relates to the field of low-voltage electric appliances, in particular to an insertion type circuit breaker, which comprises a circuit breaker shell and at least one protective electrode, wherein the circuit breaker shell is provided with at least one protective electrode assembly cavity; the plug-in circuit breaker is in a closing state, when the plug-in circuit breaker is in a short circuit or is overloaded, the protection mechanism drives the operating mechanism to act so as to enable the plug-in circuit breaker to enter a switching-off state, and after a fault is eliminated, the operating button is pressed to drive the operating mechanism to act so as to enable the plug-in circuit breaker to enter a closing state; the plug-in circuit breaker has compact structure and small volume.

Description

Plug-in circuit breaker

Technical Field

The invention relates to the field of low-voltage electrical appliances, in particular to a plug-in circuit breaker.

Background

In the communication industry, a standard cabinet takes 1U as a working unit, and the height of the standard cabinet is about 44.45 mm. With the rapid development of communication technology, components inside the cabinet need to be continuously miniaturized to meet the installation size requirement of the 1U unit, so as to improve the density of the components in the cabinet to save the whole volume of the communication equipment.

The height of the existing common miniature circuit breaker is usually between 80mm and 90mm, and the wiring space of wires at an upper wire outlet end and a lower wire outlet end needs to occupy 3U, so that the development of miniaturization of a communication cabinet is restricted; in addition, the outlet end of the common miniature circuit breaker is positioned in the cabinet, which is not beneficial to the wiring of users. Furthermore, if the function of auxiliary signals is added to the ordinary miniature circuit breaker, the side face of the circuit breaker is often required to be added with auxiliary contact accessories or other accessories with similar functions, so that the use cost is increased, more installation spaces are occupied, and the miniaturization development of a communication cabinet is not facilitated.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a plug-in circuit breaker which is compact in structure and small in size.

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

a plug-in circuit breaker comprising a circuit breaker housing and at least one protection pole, the circuit breaker housing comprising at least one protection pole assembly chamber; each protective electrode comprises an operating button 1d, an operating mechanism 3 which is arranged in the protective electrode assembly cavity and is in driving connection with the operating button 1d, a protective mechanism 4 which is in driving fit with the operating mechanism 3, an arc extinguishing system 5, a first wire inlet terminal 110, a first wire outlet terminal 11, a movable contact 61 which is connected with the operating mechanism 3 and a static contact 62 which is in fit with the movable contact 61; one end of the operating button 1d is inserted into the breaker shell, the operating button 1d and the first wire outgoing terminal 11 are arranged at one end of the breaker shell, and the first wire incoming terminal 110 is arranged at the other end of the breaker shell; the arc extinguishing system 5 is arranged in the middle of the protective electrode assembly cavity and located on one side of the first wire inlet terminal 110, the operating mechanism 3 is arranged between the operating button 1d and the arc extinguishing system 5, and the protection mechanism 4 is arranged on one side of the operating mechanism 3 and located between the first wire outlet terminal 11 and the arc extinguishing system 5;

when the plug-in circuit breaker is in a closing state and a short-circuit fault or an overload fault occurs, the protection mechanism 4 drives the operating mechanism 3 to act to enable the plug-in circuit breaker to enter a switching-off state, and after the fault is eliminated, the operating button 1d is pressed to enable the operating mechanism 3 to act to enable the plug-in circuit breaker to enter the closing state.

Preferably, the operating mechanism 3 comprises a U-shaped link 35, an operating handle 30, a contact supporting rod 31, a trip 32, a latch 36, a latch return spring 37, a main pull spring 33 and a trip return spring 38;

the operating handle 30 is pivotally arranged on the breaker shell, one end of the operating handle 30 is in driving connection with the operating button 1d through the U-shaped connecting rod 35, the other end of the operating handle is in rotating connection with one end of the contact supporting rod 31, and the other end of the contact supporting rod 31 is provided with a movable contact 61; one end of the trip 32 is pivotally arranged on the breaker shell, and the middle part of the trip is connected with one end of the contact supporting rod 31 provided with the moving contact 61 through the main pull spring 33; the middle part of the lock catch 36 is rotatably arranged, one end of the lock catch is connected with the lock catch return spring 37, and the other end of the lock catch is in lock catch fit with the other end of the jump buckle 32 and is in driving fit with the protection mechanism 4; one end of the jump buckle reset spring 38 is connected with the breaker shell, and the other end is connected with the jump buckle 32;

when the plug-in circuit breaker is in a closing state and a short-circuit fault or an overload fault occurs, the protection mechanism 4 drives the lock catch 36 and the trip catch 32 to release the lock catch cooperation, the plug-in circuit breaker trips, the trip catch reset spring 38 drives the trip catch 32 to rotate, the trip catch 32 and the lock catch 36 are enabled to be in lock catch cooperation again, and meanwhile the plug-in circuit breaker enters a switching-off state.

Preferably, the jumper 32 is a U-shaped structure, and includes a jumper first arm 32a and a jumper second arm 32b that are oppositely disposed, a bottom of the U-shaped structure of the jumper 32 is disposed near one end of the operating handle 30 connected to the contact supporting rod 31, one end of the jumper first arm 32a is pivotally disposed, the other end is connected to the jumper second arm 32b, and the other end of the jumper second arm 32b is in locking engagement with the lock 36.

Preferably, the jump buckle reset spring 38 is a torsion spring, which is sleeved on a jump buckle reset spring shaft 380 located at one side of the jump buckle first arm 32a, and two ends of the jump buckle reset spring shaft 380 are respectively fixed on the breaker housing; the middle part of the jump buckle first arm 32a is provided with a jump buckle reset boss 323, one end of the jump buckle reset spring 38 is connected with the breaker shell, and the other end is connected with the jump buckle reset boss 323.

Preferably, the operating mechanism 3 further comprises a linkage 44, the linkage 44 comprises a linkage rod 440 and a linkage shaft 441 arranged at one end of the linkage rod 440, two ends of the linkage shaft 440 are respectively pivotally arranged on the circuit breaker housing, a polygonal hole 4410 is arranged in the middle of the linkage shaft 440 along the axial direction thereof, and a linkage driven platform 442 is arranged at one side of the linkage rod 440 opposite to the jump buckle 32; the second jump buckle arm 32b is provided with a linkage driving platform 322 which is in driving fit with the linkage driven platform 442;

the plug-in circuit breaker comprises a plurality of protection poles, linkage shafts 441 of the protection poles are connected through a linkage piece connecting shaft, when one protection pole trips, a linkage piece driving platform 322 of a tripping buckle 32 of the protection pole drives a linkage rod 440 to swing through a linkage piece driven platform 442, the linkage rod 440 drives the linkage shafts 441 to rotate, linkage rods 440 of other protection poles are driven to swing, and a buckle 36 of each protection pole is knocked respectively, so that each protection pole is synchronously tripped.

Preferably, the contact supporting rod 31 is integrally in an arch structure, one end of the contact supporting rod 31 is provided with a supporting rod rotating shaft 311 which is rotatably connected with the operating handle 30, the other end of the contact supporting rod is provided with a moving contact 61, the moving contact 61 comprises a moving contact plate 610 connected with the contact supporting rod 31 and a moving contact 611 arranged at one end of the moving contact plate 610, and the other end of the moving contact plate 610 is connected with the main pull spring 33; the middle part of the contact supporting rod 31 is further provided with an arc isolating plate 34, when the plug-in circuit breaker is in an opening state, the arc isolating plate 34 enters between the moving contact 61 and the static contact 62, and when the plug-in circuit breaker is in a closing state, the arc isolating plate 34 moves out between the moving contact 61 and the static contact 62.

Preferably, the protection mechanism 4 includes a magnetic yoke 40 and a bimetal 42, the magnetic yoke 40 is disposed on one side of the latch 36, the bimetal 42 is disposed in the middle of the magnetic yoke 40 and located between the magnetic yoke 40 and the latch 36, one end of the bimetal 42 is fixedly disposed and electrically connected to the first outgoing line terminal 11, and the other end of the bimetal 42 is in driving fit with the latch 36 and electrically connected to the movable contact 61;

when short-circuit fault occurs, the lock catch 36 is attracted to swing towards the direction of the magnetic yoke 40, and the lock catch is disengaged from the lock catch of the jump buckle 32; when overload failure occurs, the bimetal 42 drives the latch 36 to swing towards the yoke 40, and the latch matching with the trip 32 is released.

Preferably, the middle of the latch 36 is rotatably disposed on one end of the magnetic yoke 40, one end of the latch 36 is connected to the circuit breaker housing through a latch return spring 37, and the other end is disposed opposite to the magnetic yoke 40; one end of the bimetal 42 is electrically connected to the first wire outlet terminal 11 through the first conductive plate 2b, the other end of the bimetal is electrically connected to the contact supporting rod 31 through the flexible connection 63, and the fixed contact 62 is electrically connected to the first wire inlet terminal 110.

Preferably, the cross section of the magnetic yoke 40 is L-shaped, one end of the magnetic yoke 40 is provided with two magnetic yoke supporting arms 400 which are oppositely arranged, the magnetic yoke supporting arms 400 are provided with magnetic yoke limiting grooves 401, the latch 36 comprises a latch resetting end 360, a latch supporting arm 361, a latch main body 362, a latch hole 363 and a latch driven end 364, the latch resetting end 360, the latch main body 362 and the latch driven end 364 are sequentially connected, two latch supporting arms 361 are respectively arranged on two sides of the joint of the latch resetting end 360 and the latch main body 362, the latch driven end 364 is L-shaped, one end of the latch driven end is connected with the latch main body 362 in a bending mode, the other end of the latch driven end is in driving fit with the bimetallic strip 42, the two latch supporting arms 361 are respectively arranged in the two magnetic yoke limiting grooves 401, the latch main body 362 is oppositely arranged with the magnetic yoke 400, and the.

Preferably, the arc extinguishing system 5 includes an arc extinguishing chamber 50, and a moving contact arc striking plate 51 and a static contact arc striking plate 52 respectively disposed at two sides of the arc extinguishing chamber 50; the moving contact arc striking plate 51 is matched with the moving contact 61 and electrically connected with the first wire outlet terminal 11, one end of the static contact arc striking plate 52 is provided with a static contact 62, and the other end is electrically connected with the first wire inlet terminal 110.

Preferably, the circuit breaker further comprises a locking mechanism, wherein the locking mechanism comprises a first locking piece 9, one end of the first locking piece 9 is arranged in the circuit breaker shell in a sliding mode, and the other end of the first locking piece 9 is a first protrusion 90 protruding out of the circuit breaker shell;

when plug-in circuit breaker equipment configuration circuit breaker assembly position, the first arch 90 of casing extrusion of circuit breaker assembly position makes first locking piece 9 wholly remove to circuit breaker casing inside, treats that plug-in circuit breaker assembly targets in place the back, and the protruding casing spacing cooperation of circuit breaker casing assembly position of first arch 90 outside at circuit breaker casing.

Preferably, the locking mechanism further comprises a second locking piece 8, the middle part of the second locking piece 8 is rotatably arranged, one end of the second locking piece is in driving fit with the operating button 1d, and the other end of the second locking piece is in driving fit with the first locking piece 9; when plug-in circuit breaker is in the separating brake state, draw operating button 1d, remove the spacing cooperation of first protruding 90 and the casing of circuit breaker assembly position to the inside direction of circuit breaker casing through the first protruding 90 of second locking piece 8 drive.

Preferably, the second locking member 8 further comprises a second protrusion 82, and the second protrusion 82 is disposed at one end of the second locking member 8, which is engaged with the first locking member 9;

when the plug-in circuit breaker is in a closing state, the operating button 1d drives the second locking member 8, so that the second protrusion 82 protrudes outside the circuit breaker housing; when the plug-in circuit breaker is in the open state, the operating button 1d drives the second locking member 8, so that the second protrusion 82 moves into the circuit breaker housing.

The plug-in circuit breaker has the advantages that the layout of the protective pole is more compact, the volume of the plug-in circuit breaker is obviously reduced, the internal space of a communication cabinet is saved, and the miniaturization development trend of the communication cabinet is met. In addition, protection mechanism simple structure when having guaranteed short-circuit protection and overload protection function, is showing and is reducing its shared assembly space, is favorable to reducing plug-in circuit breaker's volume.

Drawings

Fig. 1 is a schematic structural view of a plug-in type circuit breaker of the present invention, which shows at least an external appearance structure of the plug-in type circuit breaker;

fig. 2 is a schematic view of the structure of the neutral pole of the plug-in circuit breaker of the present invention;

fig. 3 is a schematic view of the structure of the protection pole of the plug-in circuit breaker of the present invention;

fig. 4 is another schematic view of the structure of the protection pole of the plug-in circuit breaker of the present invention;

fig. 5 is a schematic structural view of a first embodiment of the operating mechanism of the present invention, when the plug-in type circuit breaker is in the open state;

fig. 6 is a schematic structural view of a first embodiment of the operating mechanism of the present invention, when the plug-in type circuit breaker is in a closing state;

fig. 7 is a schematic structural view of a first embodiment of the operating mechanism of the present invention, when the plug-in type circuit breaker is in a tripped state;

fig. 8 is a schematic structural view of a second embodiment of the operating mechanism of the present invention, when the plug-in type circuit breaker is in a closed state;

fig. 9 is a schematic structural view of a second embodiment of the operating mechanism of the present invention, when the plug-in type circuit breaker is in the open state;

FIG. 10 is an exploded view of the locking mechanism of the present invention;

FIG. 11 is another exploded view of the locking mechanism of the present invention;

FIG. 12 is a schematic structural view of the indicator of the present invention showing at least the indicator horizontal arm and the indicator vertical arm;

FIG. 13 is a schematic structural view of an indicator of the present invention showing at least the indicator rail axis;

FIG. 14 is a schematic structural view of the first locking member of the present invention showing at least a first tab, a first follower tab and a second follower tab;

FIG. 15 is a schematic structural view of the first locking member of the present invention showing at least the locking member spring retention groove and the first track groove;

fig. 16 is a schematic view of the locking mechanism of the present invention, when the plug-in circuit breaker is in the open state;

fig. 17 is a schematic structural view of the locking mechanism of the present invention, when the plug-in circuit breaker is in a closed state;

FIG. 18 is a schematic structural view of the lock mechanism of the present invention, showing at least the fitting relationship of the second lock member driving portion of the second lock member with the second driven protrusion;

fig. 19 is a schematic structural view of a first embodiment of the connection terminal of the present invention;

fig. 20 is another structural schematic view of the first embodiment of the connecting terminal of the present invention;

fig. 21 is a third structural view of the first embodiment of the connection terminal of the present invention;

fig. 22 is a schematic structural view of a second embodiment of the connection terminal of the present invention;

fig. 23 is another structural schematic view of the second embodiment of the connecting terminal of the present invention;

fig. 24 is a third structural view of the second embodiment of the connecting terminal of the present invention;

fig. 25 is a schematic view of an assembled structure of a third embodiment of the connection terminal of the present invention;

fig. 26 is an exploded view of a third embodiment of the terminal of the present invention;

fig. 27 is a schematic structural view of a third embodiment of the connection terminal of the present invention, showing at least the positional relationship and the connection relationship of the binding screw, the nut member, the tension plate and the tension plate mounting shaft;

fig. 28 is a schematic structural view of a nut member of the connection terminal of the third embodiment of the invention;

fig. 29 is a schematic structural view of a tension plate of a connection terminal of a third embodiment of the present invention;

fig. 30 is another schematic structural view of a terminal block of a third embodiment of the present invention.

Detailed Description

The following description of the embodiments of the plug-in circuit breaker according to the invention will be given in conjunction with the embodiments shown in fig. 1 to 30. The plug-in circuit breaker of the invention is not limited to the description of the following embodiments.

The plug-in circuit breaker comprises a circuit breaker shell and at least one protective pole, wherein the circuit breaker shell comprises at least one protective pole assembling cavity, and the protective pole assembling cavity is matched with the protective pole in a one-to-one mode; each protective electrode comprises an operating button 1d, an operating mechanism 3 which is arranged in the protective electrode assembly cavity and is in driving connection with the operating button 1d, a protective mechanism 4 which is in driving fit with the operating mechanism 3, an arc extinguishing system 5, a first wire inlet terminal 110, a first wire outlet terminal 11, a movable contact 61 which is connected with the operating mechanism 3 and a static contact 62 which is in fit with the movable contact 61.

It should be noted that the plug-in circuit breaker of the present invention can be configured as follows according to the need: a single-pole circuit breaker (i.e. a circuit breaker with only one protection pole), or a two-pole circuit breaker with one protection pole, or a two-pole circuit breaker with two protection poles, or a three-pole circuit breaker with three protection poles, or a four-pole circuit breaker with four protection poles.

Preferably, as shown in fig. 2 and 3, one end of the operating button 1d is inserted into the circuit breaker housing, the operating button 1d and the first wire outgoing terminal 11 are arranged at one end of the circuit breaker housing, and the first wire incoming terminal 110 is arranged at the other end of the circuit breaker housing; arc extinguishing system 5 sets up in the middle part of the protection pole assembly chamber and is located first incoming line terminal 110 one side, and operating device 3 sets up between operating button 1d and arc extinguishing system 5, and protection machanism 4 sets up between first outgoing line terminal 11 and arc extinguishing system 5 and is located operating device 3 one side. The plug-in circuit breaker has the advantages that the layout of the protective pole is more compact, the volume of the plug-in circuit breaker is obviously reduced, the internal space of a communication cabinet is saved, and the miniaturization development trend of the communication cabinet is met. Specifically, as shown in fig. 2-3, from left to right, the protection mechanism 4 and the operating mechanism 3 are arranged side by side, the protection mechanism 4 occupies about 1/4 of the width of the breaker housing, and the operating mechanism 3 occupies about 3/4 of the width of the breaker housing; the arc extinguishing system 5 is arranged below the protection mechanism 4 and the operating mechanism 3, and occupies about 3/5 the width of the breaker housing.

Preferably, as shown in fig. 6, the plug-in circuit breaker is in a closing state, the operating mechanism 3 is in a locking state, and when a short-circuit fault or an overload fault occurs, the protection mechanism 4 drives the operating mechanism 3 to trip, the plug-in circuit breaker trips, the operating mechanism 3 enters a tripping state (as shown in fig. 7), the operating button 1d is pulled to move in a switching-off direction, the operating mechanism 3 is driven to return to the locking state, and the plug-in circuit breaker enters a switching-off state (as shown in fig. 5). Further, as shown in fig. 3-7, the operating mechanism 3 includes a U-shaped link 35, an operating handle 30, a contact supporting rod 31, a jumper 32, a latch 36, a latch return spring 37 and a main pull spring 33; the operating handle 30 is pivotally arranged on the breaker shell, one end of the operating handle 30 is in driving connection with the operating button 1d through the U-shaped connecting rod 35, the other end of the operating handle is in rotating connection with one end of the contact supporting rod 31, and the other end of the contact supporting rod 31 is provided with a movable contact 61; one end of the trip 32 is pivotally arranged on the breaker shell, and the middle part of the trip is connected with one end of the contact supporting rod 31 provided with the moving contact 61 through the main pull spring 33; the middle part of the lock catch 36 is rotatably arranged, one end of the lock catch is connected with the lock catch return spring 37, and the other end of the lock catch is in lock catch fit with the other end of the jump buckle 32 and is in driving fit with the protection mechanism 4. Further, one end of the latch 36 is connected to the circuit breaker housing through a latch return spring 37.

Preferably, as shown in fig. 8, when the plug-in circuit breaker is in a closed state and a short-circuit fault or an overload fault occurs, the protection mechanism 4 drives the operating mechanism 3 to operate, so that the plug-in circuit breaker enters an open state (as shown in fig. 9), and after the fault is cleared, the operating button 1d is pressed to move in a closing direction, so that the operating mechanism 3 is driven to operate, so that the plug-in circuit breaker enters a closed state. Further, as shown in fig. 3, 8-9, the operating mechanism 3 includes a U-shaped link 35, an operating handle 30, a contact supporting rod 31, a jumper 32, a latch 36, a latch return spring 37, a main pull spring 33, and a jumper return spring 38; the operating handle 30 is pivotally arranged on the breaker shell, one end of the operating handle 30 is in driving connection with the operating button 1d through the U-shaped connecting rod 35, the other end of the operating handle is in rotating connection with one end of the contact supporting rod 31, and the other end of the contact supporting rod 31 is provided with a movable contact 61; one end of the trip 32 is pivotally arranged on the breaker shell, and the middle part of the trip is connected with one end of the contact supporting rod 31 provided with the moving contact 61 through the main pull spring 33; the middle part of the lock catch 36 is rotatably arranged, one end of the lock catch is connected with the shell of the circuit breaker through a lock catch return spring 37, and the other end of the lock catch is in driving fit with the protection mechanism 4 and is in lock fit with the jump buckle 32; one end of the jump buckle reset spring 38 is connected with the breaker shell, and the other end is connected with the jump buckle 32; when the plug-in circuit breaker is in a closing state and a short-circuit fault or an overload fault occurs, the protection mechanism 4 drives the lock catch 36 and the trip catch 32 to release the lock catch fit, the plug-in circuit breaker trips, the trip catch return spring 38 drives the trip catch 32 to enable the trip catch 32 and the lock catch 36 to be in lock catch fit again, and meanwhile, the plug-in circuit breaker enters a switching-off state.

Preferably, as shown in fig. 3 to 9, the protection mechanism 4 includes a magnetic yoke 40 and a bimetal 42, the magnetic yoke 40 is disposed on one side of the latch 36, the bimetal 42 is disposed in the middle of the magnetic yoke 40 and located between the magnetic yoke 40 and the latch 36, one end of the bimetal 42 is fixedly disposed and electrically connected to the first outgoing line terminal 11, and the other end of the bimetal 42 is in driving fit with the latch 36 and electrically connected to the movable contact 61; when the plug-in circuit breaker is in a closing state and a short-circuit fault occurs, the lock catch 36 is attracted to the direction of the magnetic yoke 40 to swing, and the lock catch is disengaged from the lock catch of the trip catch 32; when the plug-in circuit breaker is in a closing state and an overload fault occurs, the bimetallic strip 42 bends to drive the latch 36 to swing towards the direction of the magnetic yoke 40, and the latch matching with the trip catch 32 is removed. The protection mechanism 4 has both short-circuit protection and overload protection functions, has simple and compact structure, can effectively reduce the required assembly space while reliably finishing the protection function, and is favorable for the miniaturization development trend of the plug-in circuit breaker.

Preferably, as shown in fig. 1 to 4, the plug-in circuit breaker of the present invention further comprises at least two auxiliary signal terminals that are plug-connected to an external circuit; the moving contact 61 is electrically connected with the first wire outlet terminal 11, the fixed contact 62 is electrically connected with the first wire inlet terminal 110, each auxiliary signal terminal is electrically connected with the first wire outlet terminal 11, and a signal processing element is connected in series between at least one auxiliary signal terminal and the first wire outlet terminal 11. Further, the signal processing element comprises at least one diode. Furthermore, the plug-in circuit breaker of the present invention further includes a second incoming line terminal 100 and a second outgoing line terminal 10, wherein the second incoming line terminal 100 and the first incoming line terminal 110 are arranged side by side at one end of the breaker housing, the second outgoing line terminal 10 and the first outgoing line terminal 11 are arranged side by side at the other end of the plug-in circuit breaker, and two auxiliary signal terminals are arranged side by side between the first incoming line terminal 110 and the second incoming line terminal 100. According to the plug-in circuit breaker, the auxiliary signal terminal generates the auxiliary signal by utilizing the movable/fixed contact, so that the space and cost for installing the auxiliary contact or similar accessories are saved, the structure of the circuit breaker is simplified, and the miniaturization trend of the plug-in circuit breaker is met; and the auxiliary signal end outputs signals, which can be used for judging the opening/closing state of the plug-in circuit breaker, such as realizing remote monitoring.

Preferably, as shown in fig. 10-18, the plug-in circuit breaker of the present invention has one end of the operation button 1d inserted into the breaker housing as the inner end of the button, and the other end of the operation button 1d protruding outside the breaker housing as the outer end of the button; the operating button 1d comprises an indicating piece slot arranged in the middle of the operating button and an indicating hole 12d arranged on the outer end of the operating button, and the indicating hole 12d is communicated with one end of the indicating piece slot; the plug-in circuit breaker also comprises an indicator 7, one end of which is provided with a closing indicating surface 70 and a opening indicating surface 71 which are respectively matched with the indicating hole 12 d; when the plug-in circuit breaker is in a switching-off state, the switching-off indicating surface 71 and the indicating hole 12d are arranged oppositely, the operating button 1d is pressed to move towards the switching-on direction, meanwhile, the indicating piece 7 moves integrally in the indicating piece slot, after the plug-in circuit breaker enters the switching-on state, the switching-on indicating surface 70 and the indicating hole 12d are arranged oppositely, the operating button 1d is pulled to move towards the switching-off direction, meanwhile, the indicating piece 7 moves integrally in the indicating piece slot, and after the plug-in circuit breaker enters the switching-off state, the switching-off indicating surface 71 and the indicating hole 12d are arranged oppositely.

Further, the moving direction of the operation button 1d is perpendicular to the moving direction of the indicator 7 in the indicator insertion groove.

Further, as shown in fig. 10 and 12, the operation button 1d further includes indicator slide grooves 100d respectively provided on a pair of side walls of the indicator insertion groove, and an extending direction of the indicator slide grooves 100d is perpendicular to a moving direction of the operation button 1 d; the indicator 7 further includes two indicator slide tables 72 respectively provided on a pair of side faces thereof, the indicator slide tables 72 being slidably provided in the indicator slide groove 100 d.

Further, as shown in fig. 10, 11 and 13, the indicator 7 further includes an indicator rail shaft 75 provided at the other end thereof; the circuit breaker shell is provided with an indicating piece track groove, an indicating piece track shaft 75 is arranged in the indicating piece track groove in a sliding mode, and when the operating button 1d is pressed/pulled, the indicating piece track groove drives the indicating piece 7 to integrally move in the indicating piece slot through the indicating piece track shaft 75, so that the closing indicating surface 70/opening indicating surface 71 and the indicating hole 12d are arranged oppositely.

The plug-in circuit breaker of the invention, its indicator 7 is inserted in the indicator slot that is set up in the operating button 1d, the occupied space is few, the miniaturization design favorable to circuit breaker, closing indicating surface 70 and separating brake indicating surface 71 of the indicator 7 can be set up with indicating hole 12d relatively separately, users can see the direct-viewing of indicating hole 12d, the separating brake/closing state of the fast judgement circuit breaker, and the indicator moves in the indicator slot integrally, in order to realize the switching of closing indicating surface and separating brake indicating surface that is shown in the indicating hole, the movements of the indicator are more accurate, the error is small, make the closing indicating surface or separating brake indicating surface fill the indicating hole completely, have prevented closing indicating surface and separating brake indicating surface from showing in the indicating hole at the same time, cause the situation that users judge the mistake happens, help to improve users's electrical safety, the indicator chute 100d cooperates with indicator sliding table 72, the moving path of the indicator 7 is limited, and the reliability of the indicating result is ensured.

As shown in fig. 1-4, one embodiment of a plug-in circuit breaker of the present invention is shown.

The invention relates to a plug-in circuit breaker, which comprises a circuit breaker shell and at least one protective pole, wherein the circuit breaker shell comprises at least one protective pole assembling cavity, and the protective pole assembling cavity is matched with the protective pole in a one-to-one manner; each protective electrode comprises an operating button 1d, an operating mechanism 3 which is arranged in the protective electrode assembly cavity and is in driving connection with the operating button 1d, a protective mechanism 4 which is in driving fit with the operating mechanism 3, an arc extinguishing system 5, a first wire inlet terminal 110, a first wire outlet terminal 11, a movable contact 61 which is connected with the operating mechanism 3 and a static contact 62 which is used in cooperation with the movable contact 61; one end of the operating button 1d is inserted into the breaker shell, the operating button 1d and the first wire outgoing terminal 11 are arranged at one end of the breaker shell, and the first wire incoming terminal 110 is arranged at the other end of the breaker shell; arc extinguishing system 5 sets up in the middle part of the protection pole assembly chamber and is located first incoming line terminal 110 one side, and operating device 3 sets up between operating button 1d and arc extinguishing system 5, and protection machanism 4 sets up between first outgoing line terminal 11 and arc extinguishing system 5 and is located operating device 3 one side.

Specifically, as shown in fig. 1-2, the plug-in circuit breaker of the present invention is a two-pole circuit breaker, and includes a protection pole and a neutral pole, the protection pole is L poles, the neutral pole is N poles, the plug-in circuit breaker further includes a circuit breaker housing composed of a front cover 1c, a base 1b and a rear cover 1a, the front cover 1c and the base 1b enclose a protection pole assembly chamber in one-to-one cooperation with the protection pole, the base 1b and the rear cover 1a enclose a neutral pole assembly chamber in cooperation with the neutral pole, the circuit breaker housing includes an upper side 101 and a lower side 102, a front side 105 and a rear side 106, and a left side 103 and a right side 104, as shown in fig. 3-4, the lower end of the operation button 1d is disposed in the circuit breaker housing, the operation button 1d and the first outlet terminal 11 are disposed at the upper end of the circuit breaker housing, the first outlet terminal 110 is disposed at the lower end of the circuit breaker housing, the arc extinguishing system 5 is disposed in the middle of the protection pole assembly chamber and is disposed at the upper side of the first inlet terminal 110, the operation mechanism 3 is disposed between the operation button 1d and the arc extinguishing system 5, and.

Preferably, as shown in fig. 1-2, the neutral pole further includes a second incoming line terminal 100 and a second outgoing line terminal 10, the second incoming line terminal 100 and the first incoming line terminal 110 are arranged side by side at the lower end of the breaker housing, the second outgoing line terminal 10 and the first outgoing line terminal 11 are arranged side by side at the upper end of the breaker housing, and the second incoming line terminal 100 is electrically connected to the second outgoing line terminal 10 through a second conductive plate 2 a. Specifically, as shown in fig. 1, the first incoming line terminal 110 and the second incoming line terminal 100 are respectively disposed at the right portion and the left portion of the lower end of the circuit breaker housing; the first outlet terminal 11 and the second outlet terminal 10 are both disposed on the left side of the operation button 1 d.

Preferably, as shown in fig. 2, each of the first inlet terminal 110 and the second inlet terminal 100 includes a first elastic element 2c, each of the first elastic elements 2c includes a first spring connecting plate and two first spring clamping plates disposed oppositely, the two first spring clamping plates are respectively connected to two ends of the first spring connecting plate in a bent manner, each of the first spring clamping plates is in a "structure of" type, and the two first spring clamping plates are integrally in an X-shaped structure.

As shown in fig. 3-7, a first embodiment of an operating mechanism 3 of a plug-in circuit breaker according to the invention is shown.

The operating mechanism 3 of the first embodiment includes a U-shaped link 35, an operating handle 30, a contact support bar 31, a jumper 32, a latch 36, a latch return spring 37, and a main tension spring 33; the operating handle 30 is pivotally arranged on the breaker shell, one end of the operating handle 30 is in driving connection with the operating button 1d through the U-shaped connecting rod 35, the other end of the operating handle is in rotating connection with one end of the contact supporting rod 31, and the other end of the contact supporting rod 31 is provided with a movable contact 61; one end of the trip 32 is pivotally arranged on the breaker shell, and the middle part of the trip is connected with one end of the contact supporting rod 31 provided with the moving contact 61 through the main pull spring 33; the middle part of the lock catch 36 is rotatably arranged, one end of the lock catch is connected with the lock catch return spring 37, and the other end of the lock catch is in driving fit with the protection mechanism 4 and is in lock fit with the other end of the jump buckle 32. Further, one end of the return spring 37 is connected to one end of the latch 36, and the other end is connected to the circuit breaker housing, specifically, the return spring 37 may be a torsion spring or a straight-tube spring.

Further, as shown in fig. 3-7, the jumper 32 has a U-shaped structure (see fig. 6), and includes a jumper first arm 32a and a jumper second arm 32b that are oppositely disposed, a bottom of the U-shaped structure of the jumper 32 is disposed near an end of the operating handle 30 connected to the contact support rod 31, one end of the jumper first arm 32a is pivotally disposed, the other end is connected to an end of the jumper second arm 32b, and the other end of the jumper second arm 32b is in locking engagement with the lock 36.

Further, as shown in fig. 3-7, the contact supporting rod 31 is integrally formed in an arch shape, one end of the contact supporting rod 31 is provided with a supporting rod rotating shaft 311 rotatably connected to the operating handle 30, the other end of the contact supporting rod is provided with a movable contact 61 (see fig. 5), the movable contact 61 comprises a movable contact plate 610 connected to the contact supporting rod 31 and a movable contact 611 arranged at one end of the movable contact plate 610, and the other end of the movable contact plate 610 is connected to the main pulling spring 33. Further, an arc isolating plate 34 (see fig. 3) is further disposed in the middle of the contact supporting rod 31, when the plug-in circuit breaker is in an open state, the arc isolating plate 34 enters between the movable contact 61 and the fixed contact 62, and when the plug-in circuit breaker is in a closed state, the arc isolating plate 34 moves out between the movable contact 61 and the fixed contact 62.

Further, as shown in fig. 5-7, the contact support 3 further includes a linkage 44, the linkage 44 includes a linkage rod 440 and a linkage shaft 441 disposed at one end of the linkage rod 440, two ends of the linkage shaft 440 are respectively pivotally disposed on the circuit breaker housing, a polygonal hole 4410 is disposed in the middle of the linkage shaft 440 along the axial direction thereof, and a linkage driven platform 442 is disposed at one side of the linkage rod 440 opposite to the jumper 32; the second jump buckle arm 32b is provided with a linkage driving platform 322 which is in driving fit with the linkage driven platform 442; the plug-in circuit breaker comprises a plurality of protection poles, linkage shafts 441 of the protection poles are connected through linkage piece connecting shafts, the linkage piece connecting shafts are respectively matched with the polygonal holes 4410 of the linkage pieces 44, when one protection pole trips, the linkage piece driving table 322 of the tripping button 32 of the protection pole drives the linkage rod 440 to swing through the linkage piece driven table 442, the linkage rod 440 drives the linkage shafts 441 to rotate, and the linkage shafts 441 drive the linkage rods 440 of other protection poles to swing through the linkage piece connecting shafts to respectively strike the locking buttons 36 of the protection poles, so that the protection poles synchronously trip. The further linkage elements 44 of the individual poles can be connected by a linkage element connecting shaft, or two adjacent poles can be connected by a linkage element connecting shaft.

Specifically, as shown in fig. 4-7, the jumper 32 and the contact support rod 31 are both disposed below the operating handle 30, the upper end of the operating handle 30 is drivingly connected to the operating button 1d through a U-shaped link 35, the middle portion is pivotally disposed on the circuit breaker housing, and the lower end is pivotally connected to the support rod rotating shaft 311 at the upper end of the contact support rod 31; the trip buckle 32 is of a U-shaped structure, the opening of the trip buckle 32 is downward, and the trip buckle comprises a second trip buckle arm 32b and a first trip buckle arm 32a which are respectively arranged at the left side and the right side of the trip buckle, the lower end of the first trip buckle arm 32a is pivoted on the shell of the circuit breaker, the upper end of the first trip buckle arm is connected with the upper end of the second trip buckle arm 32b, the lower end of the second trip buckle arm 32b is in lock catch fit with the lock catch 36, and the middle part of the trip buckle 32 is connected with the upper end of the movable contact plate 610 of the contact supporting rod; the upper end of the contact supporting rod 31 is superposed on the front side of the middle part of the trip buckle 32, the lower end is provided with a moving contact 61, the moving contact 61 comprises a moving contact plate 610, the right side of the lower end of the moving contact 610 is provided with a moving contact point 611, and the upper end is connected with the lower end of the main pull spring 33; the left end of the arc isolating plate 34 is rotatably connected with the lower end of the contact supporting rod 31, the right end of the arc isolating plate is matched with the moving contact 61 and the static contact 62, the arc isolating plate extends into the space between the moving contact 61 and the static contact 62 during opening of a brake and is moved out of the space between the moving contact 61 and the static contact 62 during closing of the brake; preferably, the contact support rod 31 is provided with a support rod-flash barrier limiting groove, and when the contact support rod 31 drives the moving contact 61 and the static contact 62 to switch on and off, the support rod-flash barrier limiting groove drives the flash barrier 34 to extend into and move out of the space between the moving contact and the static contact and limits the swing amplitude of the right end of the flash barrier 34; the lock catch 36 is arranged on the left side of the jump buckle 32, the middle part of the jump buckle is pivoted, the upper end of the lock catch is connected with the shell of the circuit breaker through a lock catch return spring 37, and the lower end of the lock catch is matched with the lower end of a second jump buckle arm 32b of the jump buckle 32 in a lock catch way; the linkage piece 44 is arranged between the lock catch 36 and the jump buckle 32, the upper end of the linkage rod 440 is pivoted through the linkage shaft 441, the right side of the middle part of the linkage rod 440 below the linkage shaft 441 is provided with a linkage piece driven table 442, and the left side of the upper end of the second jump buckle arm 32b is provided with a linkage piece driving table 322 in driving fit with the linkage piece driven table 442. Preferably, as shown in fig. 4, the operating handle 30 is pivotally mounted to the circuit breaker housing by the operating handle mounting shaft 14. Further, the two ends of the operating handle mounting shaft 14 are respectively pivotally connected with the front cover 1c and the base 1 b. Further, as shown in fig. 5 to 7, the lever 30 further includes a lever-link hole engaged with the U-link 35, a lever-support-rod hole engaged with the support-rod rotation shaft 311 of the contact support rod 31, and a lever shaft hole engaged with the lever mounting shaft 14; the lever 30 is approximately triangular, and the lever-link hole, the lever-shaft hole, and the lever-support-shaft hole are respectively provided at three vertices of a triangle.

Preferably, as shown in fig. 4, the lower end of the trip first arm 32a of the trip 32 is pivotally disposed on the circuit breaker housing by the trip mounting shaft 15. Further, the two ends of the jump buckle installation shaft 15 are respectively pivotally connected with the front cover 1c and the base 1 b. Preferably, as shown in fig. 5, the middle of the jump ring 32 is provided with a jump ring-spring connection hole 320 connected to one end of the main pull spring 33, and the upper end of the movable contact plate 610 is provided with a movable contact plate-spring connection hole 310. Preferably, as shown in fig. 5, the lower end of the jump buckle second arm 32b is in a wedge-shaped structure, and the lower end of the lock catch 36 is provided with a lock catch hole 363 in lock catch fit with the lower end of the jump buckle second arm 32 b.

As shown in fig. 8-9, a second embodiment of the operating mechanism 3 of the plug-in circuit breaker of the present invention is shown.

The operating mechanism 3 of the second embodiment differs from the first embodiment in that: the trip buckle reset spring 38 is also included, one end of the trip buckle reset spring 38 is connected with the breaker shell, and the other end is connected with the trip buckle 32; when the plug-in circuit breaker is in a closing state and a short-circuit fault or an overload fault occurs, the protection mechanism 4 drives the lock catch 36 and the trip catch 32 to release the lock catch cooperation, the plug-in circuit breaker trips, the trip catch reset spring 38 drives the trip catch 32 to rotate, the trip catch 32 and the lock catch 36 are in lock catch cooperation again, and meanwhile the plug-in circuit breaker enters a switching-off state. Further, the jump buckle reset spring 38 is a torsion spring, which is sleeved on a jump buckle reset spring shaft 380 located at one side of the jump buckle first arm 32a, and two ends of the jump buckle reset spring shaft 380 are respectively fixed on the breaker housing; a jump buckle reset boss 323 is arranged in the middle of the jump buckle first arm 32a, one end of a jump buckle reset spring 38 is connected with the breaker shell, and the other end is connected with the jump buckle 32.

Specifically, as shown in fig. 8-9, after the latch 36 and the trip 32 are disengaged, the trip 32 rotates counterclockwise, the contact support rod 31 rotates clockwise, and after the contact support rod 31 drives the movable contact 61 to enter the disengaging position, the trip return spring 38 rotates the trip 32 clockwise through the trip return boss 323 until the lower end of the second trip arm 32b is again engaged with the latch 36.

As shown in fig. 3-9, an embodiment of the protection mechanism 4 of the plug-in circuit breaker of the present invention is shown.

The protection mechanism 4 comprises a magnetic yoke 40 and a bimetallic strip 42, the magnetic yoke 40 is arranged on one side of the lock catch 36, the bimetallic strip 42 is arranged in the middle of the magnetic yoke 40 and is positioned between the magnetic yoke 40 and the lock catch 36, one end of the bimetallic strip 42 is fixedly arranged and electrically connected with the first outgoing line terminal 11, and the other end of the bimetallic strip is in driving fit with the lock catch 36 and electrically connected with the movable contact 61; the plug-in circuit breaker is in a closing state, when a short-circuit fault occurs, the lock catch 36 is attracted to the direction of the magnetic yoke 40 to swing, and the lock catch is disengaged from the lock catch of the trip catch 36; when the plug-in circuit breaker is in a closing state and an overload fault occurs, the bimetallic strip 42 drives the lock catch 36 to swing towards the direction of the magnetic yoke 40, and the lock catch is disengaged from the lock catch of the trip catch 32.

Specifically, as shown in fig. 5-9, the magnetic yoke 40 is disposed on the left side of the latch 36, the bimetallic strip 42 is disposed in the middle of the magnetic yoke 40 and between the magnetic yoke 40 and the latch 36, the upper end of the latch 36 is fixedly disposed, the middle is rotatably disposed, and the lower end is disposed opposite to the magnetic yoke 40, in driving fit with the bimetallic strip 42, and in latching fit with the jumper 32; when the plug-in circuit breaker is in a closing state and a short-circuit fault occurs, short-circuit current flows through the bimetallic strip 42 to generate a magnetic field which is strengthened by the magnetic yoke 40, and the lower end of the lock catch 36 swings towards the direction of the magnetic yoke 40 under the attraction to release the lock catch matching with the trip catch 32; when the plug-in circuit breaker is in a closing state and an overload fault occurs, the bimetallic strip 42 is heated and bent towards the left side, the lower end of the lock catch 36 is driven to swing towards the direction of the magnetic yoke 40, and the lock catch is disengaged from the lock catch of the trip catch 32.

Preferably, as shown in fig. 5-9, the middle of the latch 36 is rotatably disposed on one end of the magnetic yoke 40, one end of the latch 36 is connected to the circuit breaker housing through the latch return spring 37, and the other end is disposed opposite to the magnetic yoke 40; one end of the fixed bimetal 42 is electrically connected to the first outlet terminal 11 through the first conductive plate 2b (see fig. 3), the other end is electrically connected to the contact support rod 31 through the flexible connection 63, and the fixed contact 62 is electrically connected to the first inlet terminal 110. Further, the protection mechanism 4 further includes an adjusting screw, the adjusting screw is in limit fit with the circuit breaker housing, and one end of the adjusting screw is in threaded fit with one end of the first conductive plate 2b connected with the bimetal 42, and the position of the bimetal 42 is adjusted to adjust the tripping threshold or the parameter of the bimetal 42.

Specifically, as shown in fig. 2 to 9, the middle of the latch 36 is rotatably disposed at the upper end of the magnetic yoke 40, the upper end of the latch 36 is connected to the circuit breaker housing through the latch return spring 37, the lower end of the latch is disposed opposite to the magnetic yoke 40, the upper end of the bimetal 42 is electrically connected to the first outgoing line terminal 11 through the first conductive plate 2b, the lower end of the bimetal is electrically connected to the contact supporting rod 31 through the flexible connection 63, and the stationary contact 62 is electrically connected to the first incoming line terminal 110.

Preferably, the first conductive plate 2b is electrically connected to the contact support rod 31 through a second flexible connection, and a circuit from the second conductive plate 2b to the contact support rod is added, so that when a short circuit fault occurs in a plug-in circuit breaker with a high ampere rated current specification, the current flowing through the bimetal is reduced, and the bimetal is prevented from heating and failing due to bearing of an excessive current.

Preferably, as shown in fig. 3-9, the cross section of the magnetic yoke 40 is L-shaped, one end of the magnetic yoke 40 is provided with two magnetic yoke supporting arms 400 (see fig. 6) which are oppositely arranged, a magnetic yoke limiting groove 401 is arranged on the magnetic yoke supporting arm 400, the latch 36 comprises a latch resetting end 360, a latch supporting arm 361, a latch main body 362, a latch hole 363 and a latch driven end 364 (see fig. 5), the latch resetting end 360, the latch main body 362 and the latch driven end 364 are sequentially connected, two sides of a connection between the latch resetting end 360 and the latch main body 362 are respectively provided with one latch supporting arm 361, the latch driven end 364 is L-shaped, one end of the latch driven end is connected with the latch main body 362 in a bending manner, the other end of the latch driven end is matched with the bimetal 42, the two latch supporting arms 361 are respectively arranged in the two magnetic yoke limiting grooves 401, the latch main body 362 is arranged opposite to the magnetic yoke 400.

Specifically, as shown in the direction of fig. 3-9, two yoke support arms 400 are oppositely arranged at the upper end of the yoke 40, and a yoke limiting groove 401 is arranged on each yoke support arm 400; the upper end of the lock catch main body 362 is bent and connected with the lock catch reset end 360, the lower end of the lock catch main body is bent and connected with the lock catch driven end 364, the lock catch reset end 360 is bent towards the right side, the lock catch driven end 364 is bent towards the left side, and the middle of the lock catch main body 362 is provided with a lock catch hole 363 which is matched with the magnet yoke 40 relatively.

As shown in fig. 3-4, an embodiment of an arc extinguishing system 5 of a plug-in circuit breaker of the present invention is shown.

The arc extinguishing system 5 comprises an arc extinguishing chamber 50, and a moving contact arc striking plate 51 and a static contact arc striking plate 52 which are respectively arranged at two sides of the arc extinguishing chamber 50; the moving contact arc striking plate 51 is matched with the moving contact 61 and electrically connected with the first wire outlet terminal 11, one end of the static contact arc striking plate 52 is provided with a static contact 62, and the other end is electrically connected with the first wire inlet terminal 110.

Specifically, as shown in fig. 3 to 4, the moving contact arc striking plate 51 and the static contact arc striking plate 52 are respectively disposed on the left and right sides of the arc extinguishing chamber 50, the upper end of the moving contact arc striking plate 51 is matched with the moving contact 61, the moving contact arc striking plate 51 is electrically connected to the first wire outlet terminal 11, the static contact 62 is disposed on the upper end of the static contact arc striking plate 52, the lower end of the static contact arc striking plate is electrically connected to the first wire inlet terminal 110, and the upper end of the moving contact arc striking plate 51 and the upper end of the static contact arc striking plate 52 are bent in.

As shown in fig. 1-4, the plug-in circuit breaker of the present invention further includes at least two auxiliary signal terminals connected to the external circuit in a plug-in manner, each of the auxiliary signal terminals is electrically connected to the first outgoing line terminal 11, and a signal processing element is connected in series between at least one of the auxiliary signal terminals and the first outgoing line terminal 11. Further, the signal processing element comprises at least one diode. Furthermore, a signal processing element is connected in series between each auxiliary signal terminal and the first outlet terminal 11; or, a signal processing element is connected in series between one auxiliary signal terminal and the first wire outlet terminal 11, and no signal processing element is arranged between the other auxiliary signal terminal and the first wire outlet terminal 11.

It should be noted that the signal processing element is not limited to a diode, and may be other components capable of converting an ac signal into a dc signal; of course, the signal processing element may also simply add functionality as desired by the user.

Specifically, as shown in fig. 1 to 4, the plug-in circuit breaker of the present invention includes two auxiliary signal terminals, namely a first auxiliary signal terminal 12 and a second auxiliary signal terminal 13, which are connected to an external circuit in a plug-in manner, each of the auxiliary signal terminals is electrically connected to the first outgoing line terminal 11 through a movable contact arc-striking plate 51, and a diode is connected in series between the second auxiliary signal terminal 13 and the movable contact arc-striking plate 51. Further, as shown in fig. 1-4, first inlet terminal 110, second inlet terminal 100, first auxiliary signal terminal 12, and second auxiliary signal terminal 13 are disposed at a lower end of the plug-in circuit breaker, and first auxiliary signal terminal 12 and second auxiliary signal terminal 13 are disposed side-by-side between first inlet terminal 110 and second inlet terminal 100. Furthermore, the auxiliary signal terminal can be connected with a circuit structure such as an external control circuit board, and the like, for example, remote monitoring is realized.

Preferably, as shown in fig. 3 and 4, each auxiliary signal terminal includes a second elastic element 2d, each second elastic element 2d includes a second spring connecting plate and two second spring clamping plates disposed oppositely, the two second spring clamping plates are respectively connected to two ends of the second spring connecting plate in a bent manner, each second spring clamping plate is in a < structure, and the two second spring clamping plates are integrally in an X-shaped structure.

Preferably, as shown in fig. 3, the plug-in circuit breaker of the present invention further includes an exhaust port 16, and a first exhaust channel is further disposed in the protection pole assembly chamber, one end of the first exhaust channel is communicated with an exhaust port of an arc extinguishing chamber 50 of the arc extinguishing system 5, and the other end is communicated with the external environment through the exhaust port 16. Specifically, as shown in fig. 3, the exhaust port 16 is provided on the lower end surface of the circuit breaker housing between the second auxiliary signal terminal 13 and the first line terminal 110.

Preferably, as shown in fig. 10-13, in the plug-in circuit breaker of the present invention, one end of the operation button 1d is inserted into the breaker housing, which is the inner end of the button, and the other end of the operation button 1d protrudes outside the breaker housing, which is the outer end of the button; the operating button 1d comprises an indicating piece slot arranged in the middle of the operating button and an indicating hole 12d arranged on the outer end of the operating button, and the indicating hole 12d is communicated with one end of the indicating piece slot; the plug-in circuit breaker further comprises an indicator 7 which is inserted into the indicator slot in a sliding mode, and one end of the indicator 7 is provided with a closing indicating surface 70 and a opening indicating surface 71 which are matched with the indicating hole 12d respectively; when the plug-in circuit breaker is in a switching-off state, the switching-off indicating surface 71 and the indicating hole 12d are arranged oppositely, the operating mechanism 1d is pressed to enable the operating mechanism to move towards the switching-on direction, meanwhile, the indicating piece 7 integrally moves in the indicating piece slot, after the plug-in circuit breaker enters the switching-on state, the switching-on indicating surface 70 and the indicating hole 12d are arranged oppositely, the operating button 1d is pulled to enable the operating button to move towards the switching-off direction, meanwhile, the indicating piece 7 integrally moves in the indicating piece slot, and after the plug-in circuit breaker enters the switching-off state, the switching-off indicating surface 71 and the indicating hole 12d are.

Preferably, the moving direction of the operating button 1d is perpendicular to the moving direction of the indicator 7 in the indicator insertion slot.

Preferably, as shown in fig. 10 to 11, the operating button 1d further includes indicator sliding grooves 100d respectively disposed on a pair of sidewalls of the indicator insertion groove, and an extending direction of the indicator sliding grooves 100d is perpendicular to a moving direction of the operating button 1 d; as shown in fig. 12, the indicator 7 further includes two indicator sliding tables 72 respectively disposed on a pair of side surfaces thereof, and the indicator sliding tables 72 are slidably disposed in the indicator sliding grooves 100d to limit a moving path of the indicator 7 in the indicator insertion groove 100 d.

Preferably, as shown in fig. 11 and 13, the indicator 7 further includes an indicator rail shaft 75 provided at the other end thereof; as shown in fig. 10, the circuit breaker housing is provided with an indicator track groove, an indicator track shaft 75 is slidably disposed in the indicator track groove, and the operating button 1d is pressed/pulled, the indicator track groove drives the indicator 7 to integrally move in the indicator slot via the indicator track shaft 75, so that the closing indication surface 70/opening indication surface 71 and the indication hole 12d are disposed opposite to each other, and the indicator track groove is an inclined track groove, and may be linearly inclined or arcuately inclined. As another example of driving the movement of the indicator 7, it is also possible to provide an inclined driving surface on the indicator 7, a driving protrusion on the breaker case, and by the cooperation of the inclined driving surface and the driving protrusion, the indicator 7 is moved horizontally with respect to the operation button 1d when the operation button 1d is pressed/pulled.

Further, as shown in fig. 10, the indicator track groove is an inclined track groove, and is formed by oppositely matching two inclined half grooves on the breaker housing which are oppositely arranged; when plug-in circuit breaker is in the separating brake state, indicator track axle 75 is located the one end in indicator track groove, and for the first end in track groove, plug-in circuit breaker is in when combined floodgate state, indicator track axle 75 is located the other end in indicator track groove, and for track groove second end, track groove first end is compared in track groove second end and is close to operating button 1 d's button outer end.

It should be noted that the closing indication surface 70 and the opening indication surface 71 may be in different colors, for example, the closing indication surface is green, and the opening indication surface is red, or the closing indication surface 70 and the opening indication surface 71 have different characters or symbol marks, for example, the closing indication surface 70 has a "closing" character or an "i" symbol, and the opening indication surface 71 has a "opening" character or an "○" symbol, although the embodiments of the two are not limited to the above two, as long as the closing indication surface 70 and the opening indication surface 71 can be effectively distinguished, so as to correctly indicate the closing and opening states of the plug-in circuit breaker.

Specifically, as shown in fig. 10 and 11, the upper end of the operation button 1d is a button outer end, the lower end is a button inner end, an indication hole 12d is arranged on the end surface of the button outer end, and the indication hole 12d is communicated with the upper end of the indication piece slot; the closing indication surface 70 and the opening indication surface 71 are arranged at the upper end of the indication piece 7 side by side, the two indication piece sliding tables 72 are arranged at two sides of the middle of the indication piece 7, and the indication piece track shaft 75 is arranged at the lower end of the indication piece 7. As shown in fig. 10, the track groove of the indicator is formed by two inclined half grooves which are oppositely matched, one inclined half groove is arranged on the rear cover 1a and is a first half groove 10a, and the other inclined half groove is arranged on the base 1b and is a second half groove 10 b; the upper right end of the track groove of the indicating piece is a first end of the track groove, the lower left end of the track groove is a second end of the track groove, when the plug-in circuit breaker is switched off, the track shaft 75 of the indicating piece is positioned at the first end of the track groove, and when the plug-in circuit breaker is switched on, the track shaft 75 of the indicating piece is positioned at the second end of the track groove; as shown in fig. 10, when the operation button 1d is pressed (i.e., when the operation button 1d moves in the closing direction) when the plug-in circuit breaker is in the open state, the operation button 1d moves linearly, and the indicator track groove is inclined from the upper right to the lower left, so that the indicator track groove drives the indicator 7 to move laterally (i.e., the indicator 7 moves integrally in the indicator slot) via the indicator track shaft 75, and the open state indication surface 71 is arranged opposite to the indication hole 12d, and the switch is made to the close state indication surface 70 arranged opposite to the indication hole 12 d; when the plug-in circuit breaker is in a closed state, the indicator 7 goes through the reverse process when the operation button 1d is pulled upward.

Preferably, as shown in fig. 10 to 18, the plug-in circuit breaker of the present invention further comprises a locking mechanism, the locking mechanism comprising a second locking member 8 pivotally disposed at a middle portion thereof, the second locking member 8 comprising a locking member upper end and a locking member lower end respectively disposed at both ends thereof, the locking member lower end being provided with a second protrusion 82; when plug-in circuit breaker is in the combined floodgate state, operating button 1d passes through locking piece lower extreme drive second locking piece 8 and rotates, makes second arch 82 outstanding outside the circuit breaker casing, and when plug-in circuit breaker was in the separating brake state, operating button 1d passed through locking piece upper end drive second locking piece 8 and rotates, makes second arch 82 move into the circuit breaker casing. Further, as shown in fig. 11, 12 and 18, the indicator 7 further includes an indicator horizontal arm 74 provided at one end thereof; the second locking member 8 further comprises a second locking member driven portion 81 arranged at the upper end of the locking member, and the operation button 1d is in driving fit with the second locking member driven portion 81 through the indicating member horizontal arm 74 to drive the second locking member 8 to rotate, so that the second protrusion 82 moves into the circuit breaker housing. Further, as shown in fig. 11, 12 and 17, the second locking member 8 further includes a second locking member driven protrusion 83 provided at a lower end of the locking member, the second locking member driven protrusion 83 protrudes in a direction opposite to the second protrusion 82; when the plug-in circuit breaker is in a closed state, the horizontal arm 74 of the indicator is positioned at one side of the driven protrusion 83 of the second locking member and is in limit fit with the driven protrusion, so that the second protrusion 82 is kept protruding out of the circuit breaker housing.

Specifically, as shown in fig. 18, the horizontal arm 74 of the indicator is disposed at the lower end of the indicator 7, connected to the right angle thereof, and protrudes to the left, the second locking member driven portion 81 is disposed at the upper end of the second locking member 8, connected to the right angle thereof, and protrudes to the right, both the second protrusion 82 (in fig. 18, the second protrusion 82 is shielded by the first locking member 9) and the second locking member driven protrusion 83 are disposed at the lower end of the second locking member 8, and protrude to the left and right sides of the second locking member 8, respectively, and the horizontal arm 74 of the indicator is disposed at the lower side of the second locking member driven portion 81, and is in driving engagement therewith. As shown in fig. 18, when the plug-in circuit breaker is in the open state, the operating button 1d drives the second locking member 8 to rotate counterclockwise through the cooperation of the horizontal arm 74 of the indicator and the driven part 81 of the second locking member, and then the second protrusion 82 moves into the circuit breaker housing; as shown in fig. 17, when the plug-in circuit breaker is in a closed state, the operating button 1d moves downward, the indicator horizontal arm 74 presses against the second locking member driven protrusion 83, so that the second locking member 8 rotates counterclockwise, and the second protrusion 82 protrudes outside the circuit breaker housing, and the indicator horizontal arm 74 is located at the left side of the second locking member driven protrusion 83 and is in limit fit with the second locking member driven protrusion, so that the second protrusion 82 is kept protruding outside the circuit breaker housing.

In the plug-in circuit breaker, when the plug-in circuit breaker is in a closed state, the indicator horizontal arm 74 of the indicator 7 enables the second bulge 82 of the second locking piece 8 to keep protruding out of the shell of the circuit breaker, so that the situation that the circuit breaker is installed in the closed state and electric shock occurs is avoided, and the improvement of the electricity utilization safety of a user is facilitated.

It should be noted that the driving of the second locking member 8 is not limited to the manner of being driven by the indicator horizontal arm 74, but the lower end of the operation button 1d may be provided with a structure similar to the indicator horizontal arm 74 for driving the second locking member 8.

Preferably, as shown in fig. 10-11, 14-15, and 16-18, the locking mechanism further includes a first locking member 9, one end of the first locking member 9 is slidably disposed in the circuit breaker housing, and the other end is a first protrusion 90 protruding outside the circuit breaker housing; when plug-in circuit breaker assembles the circuit breaker assembly position of chamber type, the first arch 90 of casing extrusion of circuit breaker assembly position, make first locking piece 9 wholly to the inside removal of circuit breaker casing, treat that plug-in circuit breaker assembly targets in place the back, the protruding casing spacing cooperation with circuit breaker assembly position of first arch 90 outside the circuit breaker casing.

According to the plug-in circuit breaker, the first locking piece 9 is in limit fit with the shell of the circuit breaker assembly position after the plug-in circuit breaker is assembled to the cavity type circuit breaker assembly position and is assembled in place, so that the assembly reliability of the plug-in circuit breaker is guaranteed, the plug-in circuit breaker is prevented from being pulled out by mistake in a closing state, and the electricity utilization safety is improved.

Preferably, as shown in fig. 16-18, the lower end of the locking member of the second locking member 8 is in driving engagement with the first locking member 9; when plug-in circuit breaker is in the separating brake state, draw operating button 1d, operating button 1d drives first locking piece 9 through second locking piece 8 and wholly removes to circuit breaker casing is inside, makes first arch 90 remove the spacing cooperation with the casing of circuit breaker equipment position. Further, as shown in fig. 14 to 18, the first sliding end 90a further includes a first driven protrusion 91 and a second driven protrusion 94; the second locking piece 8 further comprises a second locking piece main body 84 with a pivoted middle part, a second locking piece driven part 81 of the second locking piece 8 is connected with one end of the second locking piece main body 84 in a bending way, a second protrusion 82 is arranged at the other end of the second locking piece main body 84, the end of the second locking piece driven part is in driving fit with a second driven protrusion 94, the second locking piece driven part 81 and the second protrusion 82 respectively protrude towards two sides of the second locking piece main body 84, and the second protrusion 82 is in driving fit with the first driven protrusion 91.

It should be noted that the first locking member 9 may omit the first driven protrusion 91 or the second driven protrusion 94, and either one of them is retained to be engaged with the second locking member 8, but this improvement will reduce the stability and reliability of the action of the first locking member 9.

Preferably, as shown in fig. 11 and 15, the first locking member 9 further includes a first sliding end 90a slidably disposed in the circuit breaker housing, the first sliding end 90a is connected to the first protrusion 90 on one side and connected to the circuit breaker housing through a first locking member return spring 9a on the other side, and the first locking member return spring 9a provides a force to the first locking member 9 to keep the first protrusion 90 protruding outside the circuit breaker housing.

Specifically, as shown in fig. 16 and 17, the upper end of the second locking member driving portion 84 is connected to the second locking member driven portion 81 in a bent manner (connected at a right angle or connected at an approximately right angle), the second protrusion 82 is disposed at one side edge of the lower end of the second locking member main body 84, and the lower end of the second locking member driving portion 84 and the second protrusion 82 are disposed on the right side of the second driven protrusion 94 and the first driven protrusion 91, respectively; as shown in fig. 16, when the plug-in circuit breaker is in the open state, the operating button 1d is pulled upwards, and the operating button 1d drives the second locking member 8 to rotate clockwise through the cooperation of the horizontal arm 74 of the indicator 7 and the driven portion 81 of the second locking member, the lower end of the driving portion 84 of the second locking member drives the first locking member 9 to move leftwards (move inwards the circuit breaker housing) through the second driven protrusion 94 and the second protrusion 82 through the first driven protrusion 91, so that the first protrusion 90 of the first locking member 9 releases the limit fit with the housing in the circuit breaker assembly position.

Preferably, as shown in fig. 10, the circuit breaker housing is provided with a first opening 11a matching with the first protrusion 90 and the second protrusion 82. Specifically, as shown in fig. 1, the first opening 11a is disposed on the right side surface of the circuit breaker housing, and the first protrusion 90 and the second protrusion 82 respectively protrude outside the circuit breaker housing through the first opening 11 a.

As shown in fig. 11-18, one embodiment of the locking mechanism of the plug-in circuit breaker of the present invention is shown.

As shown in fig. 10 and 11, the locking mechanism includes a first locking member 9, a second locking member 8, and an indicator member 7; one end of the indicator 7 is inserted into the operating button 1d, the other end of the indicator is in driving fit with the second locking piece 8, the middle part of the second locking piece 8 is pivoted, and the other end of the indicator is in driving fit with the first locking piece 9.

Preferably, as shown in fig. 10, 11, 14 and 15, the first locking member 9 includes a first protrusion 90 and a first sliding end 90a respectively disposed at two ends thereof, and the first sliding end 90a is connected to the first protrusion 90 at one side and connected to the circuit breaker housing through a first locking member return spring 9a at the other side. Further, as shown in fig. 15, the first sliding end 90a includes a locking member spring limiting groove 92 disposed on one side thereof, a locking member spring limiting protrusion is further disposed in the middle of the locking member spring limiting groove 92, and one end of the first locking member return spring 9a is inserted into the locking member spring limiting groove 92 and is sleeved on the locking member spring limiting protrusion. Further, as shown in fig. 15, the first sliding end 90a is provided with a first track groove 93 at one end, which cooperates with a first sliding track on the circuit breaker housing to define a sliding path of the first sliding end 90 a. Further, as shown in fig. 14, the first sliding end 90a further includes a first driven protrusion 91 and a second driven protrusion 94, the first driven protrusion 91 and the first track groove 93 are respectively disposed at two ends of the first sliding end 90a, and the second driven protrusion 94 is disposed at an upper side of the first sliding end 90a and between the first locking protrusion 91 and the first track groove 93.

Preferably, as shown in fig. 10, 11, 16-18, the second locking member 8 includes a second locking member receiving portion 81, a second locking member main body 84, a second locking member receiving protrusion 83, and a second protrusion 82; the middle part of the second locking piece main body 84 is pivotally arranged on the shell of the circuit breaker through a second locking piece mounting shaft 80, one end of the second locking piece main body is connected with a second locking piece driven part 81 in a bending way, and the other end of the second locking piece main body is provided with a second locking piece driven bulge 83 and a second bulge 82; the second locking member driven portion 81 and the second protrusion 82 protrude to both sides of the second locking member main body 84, respectively, and the second locking member driven portion 81 and the second locking member driven protrusion 83 protrude on the same side of the second locking member main body 84.

Specifically, as shown in fig. 10 and 11, the second locking member 8 includes a locking member upper end and a locking member lower end respectively provided at upper and lower ends thereof, a second locking member driven portion 81 is connected to a second locking member main body 84 in a bent manner (connected at right angle or approximately connected at right angle) to constitute a locking member upper end, a second protrusion 82 and a second locking member driven protrusion 83 are provided at a lower end of the second locking member main body 84, the second protrusion 82 and a lower end of the second locking member main body 84 constitute a locking member lower end, a second locking member mounting shaft 80 is provided at a middle portion of the second locking member main body 84, both ends of the second locking member mounting shaft 80 are pivotally connected to the circuit breaker housing, the second locking member main body 84 lower end is drivingly engaged with a second driven protrusion 94, the second locking member driven protrusion 83 is provided at a side edge of the lower end of the second locking member main body 84 (as shown in fig. 10, the second locking member driven protrusion 83 is provided at a left side edge of the lower end of the second locking member main body 84), the second locking member driven protrusion 82 is protruded below the second locking member main body 84 and connected to the second locking member driven protrusion 83, the second locking member driven protrusion 84, the second locking member main body 84 is integrally formed as a structure in which the second protrusion is protruded from the lower end of the second locking member driven protrusion 3582 and the second locking member driven protrusion 84, the second locking member driven protrusion 83, the locking member main body 81 and the locking member driven protrusion 84, the locking member driven protrusion is integrally formed as a second locking member main body 82, the locking member driven protrusion 85is integrally formed as a locking member lower locking member protrusion 83, the locking member main body 82, the locking member main body is integrally.

Preferably, as shown in fig. 10-13 and 17-18, the indicator 7 includes an indicator main body 7-0, an indicator horizontal arm 74, an indicator track shaft 75, an indicator sliding table 72, a closing indicator surface 70 and an opening indicator surface 71, the indicator horizontal arm 71 is disposed at one end of the indicator main body 7-0 and is connected to the indicator main body 7-0 in a bent manner, the closing indicator surface 70 and the opening indicator surface 71 are disposed side by side at the other end of the indicator main body 7-0, and the two indicator sliding tables 72 are disposed at the middle portions of two sides of the indicator main body 7-0, further, as shown in fig. 12, the indicator 7 further includes an indicator vertical arm 73, the indicator vertical arm 73 and the indicator horizontal arm 74 are disposed at the same end of the indicator main body 70 and are integrally formed into an L-shaped structure, and the indicator vertical arm 73 is beneficial to improving the structural strength of the indicator horizontal arm 74.

Specifically, as shown in fig. 12 and 13, the closing indication surface 70 and the opening indication surface 71 are arranged side by side on the upper end surface of the indicator main body 7-0, the indicator track shaft 75, the indicator horizontal arm 71 and the indicator vertical wall 73 are all arranged at the lower end of the indicator main body 7-0, the indicator horizontal arm 71 and the indicator vertical wall 73 are arranged on the same side of the indicator main body 7-0 and are integrally formed into an L-shaped structure, the indicator track shaft 75 is arranged on the other side of the indicator main body 7-0, and the two indicator sliding tables 72 are arranged on two sides of the middle of the indicator main body 7-0 and are both located between the opening indication surface 71 and the indicator horizontal arm 71.

As shown in fig. 10, the circuit breaker housing is provided with an indicator track groove which is inclined with respect to the indicator track shaft 75, and the upper right end of the indicator track groove is inclined toward the lower left end. Further, as shown in fig. 10, the indicator track grooves include a first vertical groove, an inclined groove and a second vertical groove, the lower end of the first vertical groove is connected to the upper right end of the inclined groove, the upper end of the second vertical groove is connected to the lower left end of the inclined groove, and the lower end of the first vertical groove is higher than the upper end of the second vertical groove. Further, as shown in fig. 10, the track groove of the indicator is formed by two inclined half grooves which are oppositely matched, specifically, one inclined half groove is arranged on the rear cover 1a, and the other inclined half groove is arranged on the base 1 b.

Preferably, as shown in fig. 10, the operation button 1d includes a button body 10d and a button cap disposed at one end of the button body 10d, an indication hole 12d is disposed in the middle of the button cap, an indication member slot is disposed in the middle of the other end of the button body 10d, and two indication member sliding grooves 100d are disposed on two side walls of the indication member slot, respectively. Further, as shown in fig. 10, the operation button 1d further includes a button connecting platform 11d, and the button connecting platform 11d is rotatably connected to one end of the U-shaped link 35.

The operation of the locking mechanism will now be described with reference to fig. 16-18:

as shown in fig. 16, the plug-in circuit breaker is in the open state, the operating button 1d drives the second locking member 8 to rotate clockwise through the cooperation of the horizontal arm 74 of the indicator 7 and the driven portion 81 of the second locking member 8, and the second protrusion 82 of the second locking member 8 moves into the circuit breaker housing, in which state (open state), the plug-in circuit breaker can be installed in a circuit breaker installation site (e.g., a cabinet); as shown in fig. 18, when the plug-in circuit breaker is in the open state, the operating button 1d is continuously pulled, the operating button 1d drives the second locking piece 8 to continuously rotate clockwise through the cooperation of the horizontal arm 74 of the indicator 7 and the second locking piece driven portion 81 of the second locking piece 8, the lower end of the main body 84 of the second locking piece 8 and the second protrusion 82 respectively drive the second driven protrusion 94 and the first driven protrusion 91, so that the first protrusion 90 of the first locking piece 9 moves into the circuit breaker housing, thereby releasing the limit cooperation of the plug-in circuit breaker and the housing of the circuit breaker assembly position, and enabling the plug-in circuit breaker to be detached from the circuit breaker assembly position; as shown in fig. 17, when the plug-in circuit breaker is in a closed state, the operating button 1d drives the horizontal arm 74 of the indicator to move downward, the horizontal arm 74 of the indicator drives the second locking member 8 to rotate counterclockwise through the driven protrusion 83 of the second locking member, so that the second protrusion 82 protrudes out of the circuit breaker housing, and in this state (closed state), the second protrusion 82 protrudes out of the circuit breaker housing, and due to the limitation of the horizontal arm 74 of the indicator on the driven protrusion 83 of the second locking member, the second protrusion 82 cannot be pressed into the circuit breaker housing, so that the plug-in circuit breaker cannot be assembled to the circuit breaker assembly position when in the closed state; when the plug-in circuit breaker is switched between the opening state and the closing state, due to the matching between the indicator track shaft 75 and the indicator track groove, the indicator 7 can also reciprocate in the indicator slot of the operating button 1d, so that when the plug-in circuit breaker is switched on, the closing indication surface 70 is opposite to the indication hole 12d (preferably, the indicator track shaft 75 is located at the joint of the second vertical groove and the inclined groove), when the plug-in circuit breaker is switched off, the opening indication surface 71 is opposite to the indication hole 12d (preferably, the indicator track shaft 75 is located at the joint of the first vertical groove and the inclined groove, the operating button 1d is continuously pulled, the indicator track shaft 75 slides along the first vertical groove, and the second locking piece 8 drives the first locking piece 9 to be removed from the limit matching with the shell in which the circuit breaker is assembled.

The invention also discloses a wiring terminal.

As shown in fig. 19-24, one embodiment of the terminal of the present invention is shown.

The wiring terminal comprises a wiring screw 2e, a wire pressing plate 2g, a nut piece 2f and a wiring plate 2 j; the wiring screw 2e is in threaded connection with the nut piece 2 f; the wire pressing plate 2g is arranged between the nut piece 2f and a nut of the wiring screw, is obliquely arranged relative to the wiring board 2j, the wiring board 2j is fixedly arranged, one end of the wire pressing plate 2g is limited, and the other end of the wire pressing plate 2g is arranged opposite to the wiring board 2j to form a space for connecting a wire; and inserting a wire between the wire pressing plate 2g and the wiring board 2j, screwing the wiring screw 2e, axially moving the nut member 2f along the wiring screw 2e, and simultaneously lifting one end, matched with the wiring board 2j, of the wire pressing plate 2g by the nut member 2f to press the wire between the wire pressing plate 2g and the wiring board 2 j. Further, the nut member 2f is in limit fit with the terminal assembly cavity for accommodating the wiring terminal, the nut member 2f is prevented from rotating and can only move along the axial direction of the wiring screw 2e, the wiring screw 2e is screwed, and the nut member 2f reciprocates along the axial direction of the wiring screw 2 e.

Specifically, as shown in fig. 19 to 24, the left end of the wire pressing plate 2g is limited, the right end of the wire pressing plate 2g is arranged opposite to the wiring plate 2j and is matched with the wiring plate 2j, the wire pressing plate 2g gradually inclines downwards from the left end to the right end, the left end of the wire pressing plate 2g is higher than the right end of the wire pressing plate 2g, the wiring screw 2e is screwed, the nut member 2f moves upwards along the axial direction of the wiring screw 2e, and meanwhile, the nut member 2f drives the right end of the wire pressing plate 2g to gradually lift up, so that a lead is pressed between the wire pressing plate. Of course, when the lead needs to be disassembled, the binding screw 2e needs to be screwed, so that the nut member 2f moves downwards along the axial direction of the binding screw 2e, and the pressure between the wire pressing plate 2g and the lead is reduced, so that the lead can be disassembled better.

Preferably, as shown in fig. 19 to 24, the side of the wiring board 2j facing the wire pressing board 2g is provided with a plurality of lateral grooves or lateral ribs arranged side by side, and the extension direction of the lateral grooves or the lateral ribs is perpendicular to the wire insertion direction.

According to the wiring terminal, the wire pressing plate 2g applies pressure to the wires between the wire pressing plate 2g and the wiring board 2j, the pressure generated by deformation of the wire pressing plate 2g and the pressure applied to the wires by the nut piece 2f through the wire pressing plate 2g are mainly included, and compared with the existing wiring terminal only depending on the wire pressing plate 2g to press the wires, wiring is more reliable.

It should be noted that, in the terminal of the present embodiment, the nut member 2f may not be in limit fit with the terminal assembling cavity for accommodating the terminal, but only depends on the friction force generated by the contact between the nut member 2f and the terminal pressing plate 2g to limit the nut member 2f to rotate along with the terminal screw 2 e; in addition, since the nut member 2f is a special-shaped member, the center of gravity thereof is located at one end of the nut member 2f and does not coincide with the axis of the binding screw 2e, an eccentric force is generated to restrict the nut member 2f from following the rotation of the binding screw 2 e. In addition, in the terminal of the present embodiment, the nut member 2f and the binding screw 2e may be fixedly connected (instead of being screwed), and the binding screw 2e is screwed to the housing of the terminal mounting cavity, so that when the binding screw 2e is screwed, the binding screw 2e moves relative to the terminal mounting cavity, and simultaneously drives the nut member 2e to move, and the binding plate 2g may also be driven to move.

As shown in fig. 19-21, a first embodiment of the terminal of the present invention is shown.

The wiring terminal comprises a wiring screw 2e, a wire pressing plate 2g, a nut piece 2f, a wiring plate 2j, a wire pressing plate mounting shaft 2h and a wire pressing plate return spring 2 i; the wiring screw 2e is in threaded connection with the nut member 2f, the nut member 2f is in limit fit with a terminal assembly cavity containing a wiring terminal, the nut member 2f is prevented from rotating, the wiring screw 2e is screwed, and the nut member 2f reciprocates along the axial direction of the wiring screw 2 e; the wire pressing plate 2g is arranged between the nut piece 2f and a nut of the wiring screw, is obliquely arranged relative to the wiring plate 2j, and is fixedly arranged on the wiring plate 2 j; line ball board 2g one end is equipped with line ball board axle sleeve 20g, and the other end sets up and uses with wiring board 2j relatively, and line ball board axle sleeve 20g overlaps and establishes on line ball board installation axle 2h, and the both ends of line ball board installation axle 2h are fixed respectively on the chamber wall in terminal assembly chamber, and line ball board reset torsion spring 2i overlaps and establishes on line ball board installation axle 2h, and one end links to each other with the chamber wall in terminal assembly chamber, and the other end links to each other with line ball board 2 g. The binding post of this embodiment, its line ball board reset spring 2i can move down in nut spare 2f, and the one end of drive line ball board 2g perk falls down, has improved efficiency and convenience of taking out stitches.

Specifically, as shown in the directions of fig. 19-21, the left end of the line ball board 2g is provided with a line ball board shaft sleeve 20g, the right end of the line ball board 2g is arranged opposite to the wiring board 2j and is matched with the wiring board 2j for use, the line ball board 2g gradually inclines downwards from the left end to the right end, and the left end of the line ball board 2g is higher than the right end of the line ball board 2 g. As shown in fig. 20, at this time, the gap between the right end of the line pressing plate 2g and the wiring board 2j is the largest, and the wire can be inserted between the line pressing plate 2g and the wiring board 2j at this time, and then the wiring screw 2e is screwed, so that the nut member 2f moves upwards along the axial direction of the wiring screw 2e, and the right end of the line pressing plate 2g is driven to be gradually lifted, and the gap between the right end of the line pressing plate 2g and the wiring board 2j is gradually reduced, so that the wire is pressed; as shown in fig. 21, the gap between the right end of the tension bar 2g and the terminal plate 2j is minimum at this time and is almost 0.

Preferably, as shown in fig. 21, the wire pressing plate 2g comprises a wire pressing plate sleeve 20g, a first connecting portion 21g and a first wire pressing portion 22g, one end of the first connecting portion 21g is connected with the wire pressing plate sleeve 20g, the other end of the first connecting portion is connected with one end of the first wire pressing portion 22g in a bending mode, the other end of the first wire pressing portion 22g is matched with the wire pressing plate 2j, specifically, as shown in the direction of fig. 21, the left end of the first connecting portion 21g is connected with the wire pressing plate sleeve 20g, the right end of the first wire pressing portion 22g is connected with the left end of the first wire pressing portion 22g in a bending mode, the right end of the first wire pressing portion 22g is opposite to the wire pressing plate 2j and matched for use, as shown in fig. 19-21, the wire pressing plate 2g is integrally formed into a L-shaped structure, the width of the first wire pressing portion 22g is larger than that of the first connecting portion 21g, the length of the wire pressing sleeve 20g is the same as.

Preferably, as shown in fig. 20, the nut 2f includes a first nut portion 20f screwed to the binding screw 2e and a second nut portion 21f bent and connected to one end of the first nut portion 20f, the first nut portion 20f is provided to face the first connection portion 21g and is used in cooperation therewith, and the second nut portion 21f is provided to face the first crimping portion 22g and is used therewith. Specifically, as shown in fig. 19 to 20, in the initial state, the second portion 21f of the nut member is in contact connection with (substantially parallel to) the first pressing line portion 22g, and the right end of the first portion 20f of the nut member is in contact connection with the right end of the first connecting portion 21 g; as shown in fig. 21, after the binding screw 2e is screwed, the first wire pressing portion 22g is first driven to be gradually lifted by the second portion 21f of the nut member, and the second portion 21f of the nut member is gradually separated from the first wire pressing portion 22g, and then the first wire pressing portion 22g is driven to be continuously lifted by the first portion 20f of the nut member and the first connecting portion 21 g.

Preferably, as shown in fig. 20, an included angle α between the first connecting portion 21g and the first wire pressing portion 22g is larger than an included angle β between the first nut member portion 20f and the second nut member portion 21 f.

As shown in fig. 22-24, a second embodiment of the terminal of the present invention is shown.

The wiring terminal comprises a wiring screw 2e, a wire pressing plate 2g, a nut piece 2f and a wiring plate 2 j; the wiring screw 2e is in threaded connection with the nut member 2f, the nut member 2f is in limit fit with a terminal assembly cavity containing a wiring terminal, the nut member 2f is prevented from rotating, the wiring screw 2e is screwed, and the nut member 2f reciprocates along the axial direction of the wiring screw 2 e; the wire pressing plate 2g is arranged between the nut piece 2f and a nut of the wiring screw, is obliquely arranged relative to the wiring board 2j, the wiring board 2j is fixedly arranged, one end of the wire pressing plate 2g is limited, and the other end of the wire pressing plate 2g is arranged opposite to the wiring board 2j and is matched with the wiring board 2 j; and inserting a wire between the wire pressing plate 2g and the wiring board 2j, screwing the wiring screw 2e, axially moving the nut member 2f along the wiring screw 2e, and simultaneously lifting one end, matched with the wiring board 2j, of the wire pressing plate 2g by the nut member 2f to press the wire between the wire pressing plate 2g and the wiring board 2 j.

Preferably, as shown in fig. 22-24, the wire pressing plate 2g comprises a first wire pressing plate portion 200g, a second wire pressing plate portion 210g and a third wire pressing plate portion 220g, the first wire pressing plate portion 200g is sleeved on the wiring screw 2e through a first opening arranged on the first wire pressing plate portion, the second wire pressing plate portion 210g is provided with a second waist-shaped hole, the second wire pressing plate portion 210g is sleeved on the wiring screw 2e through the second waist-shaped hole, one end of the first wire pressing plate portion 200g is connected with one end of the second wire pressing plate portion 210g in a bending mode, the other end of the second wire pressing plate portion 210g is connected with the third wire pressing plate portion 220g in a bending mode, the other end of the third wire pressing plate portion 220g is used with the wiring board 2j in a matching mode, the second wire pressing plate portion 210g and the third wire pressing plate portion 220g are integrally arranged in an inclined mode relative to the wiring screw 2e, the first nut portion 20f is connected with the first nut portion 20f in a bending mode, the second wire pressing plate portion 21f is connected with the second wire pressing plate portion 35f, an included angle of the second wire pressing plate portion 21g is larger than that the nut portion 21f is matched with the nut portion 21g, and the nut portion 35f, and the second wire pressing plate portion 2g is arranged in a matched with the nut portion, and an included angle of the nut portion 2g, and an arc-shaped connection portion 3521 g, and an included angle of the second wire pressing plate portion 2g is larger than an arc-shaped connection portion 2g, and an included angle of the second wire pressing.

Specifically, as shown in fig. 22 to 24, the first line ball pressing plate portion 200g and the second line ball pressing plate portion 210g are sequentially arranged between a nut and a nut member 2f of a binding screw 2e, the left end of the third line ball pressing plate portion 220g is connected with the right end of the second line ball pressing plate portion 210g in a bending manner, and the right end of the third line ball pressing plate portion 220 is arranged opposite to and matched with the binding plate 2 j; as shown in fig. 22 and 23, there is no or weak interaction between the nut of the binding screw 2e and the first portion 200g of the tension plate, and between the third portion 220g of the tension plate and the second portion 21f of the nut member; as shown in fig. 24, at this time, there are large acting forces between the nut of the binding screw 2e and the first portion 200g of the tension plate, and between the second portion 210g of the tension plate and the first portion 20f of the nut member (due to the compression of the joint between the first portion 200g of the tension plate and the second portion 210g of the tension plate), when the binding screw 2e is screwed to move the nut member 2f downward, the joint between the first portion 200g of the tension plate and the second portion 210g of the tension plate in the compressed state is gradually expanded, so that the third portion 220g of the tension plate is gradually moved downward, and the wire connection terminal is more conveniently removed.

As shown in fig. 25-30, another embodiment of the terminal of the present invention is shown.

The wiring terminal comprises a wiring screw 2e, a wiring board 2g, a wiring board mounting shaft 2h, a nut member 2f and a wiring board 2 j; the binding screw 2e is in threaded connection with the nut member 2 f; the wire pressing plate 2g comprises an upper wire pressing plate 2g1 and a lower wire pressing plate 2g2 which are oppositely arranged, the upper wire pressing plate 2g1 and the lower wire pressing plate 2g2 are obliquely arranged relative to the wire pressing plate 2j, a joint of one end of the upper wire pressing plate 2g1 and one end of the lower wire pressing plate 2g2 is sleeved on a wire pressing plate mounting shaft 2h, and a free end of the lower wire pressing plate 2g2 and a free end of the upper wire pressing plate 2g1 are oppositely arranged with the wire pressing plate 2j and are matched for use; the lead is inserted between the line pressing plate 2g and the wiring board 2j, the wiring screw 2e is screwed, the nut member 2f moves along the axial direction of the wiring screw 2e, and meanwhile, the nut member 2 drives one end, matched with the wiring board 2j, of the line pressing plate 2g to lift up, so that the lead is pressed between the line pressing plate 2g and the wiring board 2 j. Furthermore, line ball board 2g and binding screw 2e are spacing cooperation, prevent line ball board 2g to the direction of keeping away from wiring board 2j and remove. Further, the nut member 2f is restrained from rotating, the binding screw 2e is screwed, and the nut member 2f reciprocates in the axial direction of the binding screw 2 e.

Preferably, as shown in fig. 26, 27 and 29, the upper wire pressing plate 2g1 and the lower wire pressing plate 2g2 are L-shaped structures, the upper wire pressing plate 2g1 includes an upper connecting portion 2g11 and an upper wire pressing portion 2g10, the upper wire pressing portion 2g10 includes a first wire pressing end and a first connecting end respectively disposed at two ends thereof, the first wire pressing end is disposed opposite to and cooperated with the wiring board 2j, the first connecting end is connected with one end of the upper connecting portion 2g11, the width of the first connecting end is larger than that of the upper connecting portion 2g11, the lower wire pressing plate 2g2 includes a lower connecting portion 2g21 and a lower wire pressing portion 2g20, the lower wire pressing portion 2g20 includes a second wire pressing end and a second connecting end respectively disposed at two ends thereof, the second wire pressing end is disposed opposite to and cooperated with the wiring board 2j, the second connecting end is connected with one end of the lower connecting portion 2g21, the width of the second connecting end is larger than that of the lower connecting portion 2g21, the other end of the lower connecting portion 2g21 is protruded from the first connecting end in the direction of the first connecting portion 11.

Specifically, as shown in the direction shown in fig. 27, the right end of the upper wire pressing part 2g10 and the right end of the lower wire pressing part 2g20 are respectively arranged opposite to the wiring board 2j and are used in cooperation, the right end of the lower wire pressing part 2g20 protrudes from the right end of the upper wire pressing part 2g10 in the direction of the wiring board 2j (to the right), and the left end of the upper wire pressing part 2g20 protrudes from the left end of the lower wire pressing part 2g20 in the direction of the wiring screw 2e (to the left); the binding screw 2e is arranged between the tension disc mounting shaft 2h and the upper tension disc part 2g10 (and is positioned between the tension disc mounting shaft 2h and the lower tension disc part 2g 20); screwing the binding screw 2e, moving the nut member 2f upwards, and simultaneously driving the right ends of the lower wire pressing part 2g20 and the upper wire pressing part 2g10 to lift upwards to press the wires tightly; if the outer diameter of the wire is smaller, the wire can be pressed only by the lower wire pressing part 2g20, and if the outer diameter of the wire is larger, the lower wire pressing part 2g20 and the upper wire pressing part 2g10 are matched to press the wire, so that the wiring reliability of the wiring terminal is improved, and the wiring terminal can be suitable for wiring operation of wires with various outer diameters.

Preferably, as shown in fig. 27, the lower wire pressing plate 2g2 further includes a wire removing elastic piece 2g22 disposed at the middle of the lower wire pressing portion 2g20, one end of the wire removing elastic piece 2g22 is connected to the lower wire pressing portion 2g20, and the other end is disposed opposite to and matched with the upper wire pressing portion 2g 10. Further, as shown in fig. 27, an included angle γ between the stitch removing elastic piece 2g22 and the lower pressing line part 2g20 is less than 90 °. When the lead needs to be detached from the wiring terminal of the invention, the wiring screw 2e is screwed to move the nut member 2f downwards, and the wire detaching elastic sheet 2g22 can provide elastic force to release the lead from the lower wire pressing part 2g20, so that the convenience and the efficiency of wire detaching are improved.

Preferably, as shown in fig. 25, 26 and 28, the connecting terminal of the present invention further includes two fixing plates 2k disposed opposite to each other, the binding screw 2e, the nut member 2f, the wire pressing plate 2g and the wiring plate 2j are disposed between the two fixing plates 2k, the two fixing plates 2k limit the nut member 2f to prevent the nut member 2f from rotating, and both ends of the wire pressing plate mounting shaft 2h are respectively connected to the two fixing plates 2 k. Further, as shown in fig. 25 and 28, the fixing plate 2k is provided with nut slide grooves 2k1, two ends of the nut 2f are respectively provided with a nut slide table 22f, and the two nut slide tables 22f are respectively slidably disposed in the two nut slide grooves 2k 1. Further, as shown in fig. 26, the fixing plate 2k is further provided with a terminal board limiting hole 2k3, a pair of edges of the terminal board 2j are respectively provided with a terminal board limiting table 2j0, and the two terminal board limiting tables 2j0 are respectively arranged in the two terminal board limiting holes 2j 0.

As shown in fig. 25 and 26, both ends of the wire pressing plate mounting shaft 25 are respectively connected to upper portions of one ends of two fixing plates 2k, specifically, both ends of the wire pressing plate mounting shaft 25 are respectively connected to upper left corners of the two fixing plates 2k, a terminal plate 2j is disposed between the other ends of the two fixing plates 2k, specifically, both ends of the terminal plate 2j are respectively connected to right ends of the two fixing plates 2k, a wire pressing plate 2g has one end connected to the wire pressing plate mounting shaft 2h and the other end disposed opposite to and cooperating with the terminal plate 2j, the wire pressing plate 2g is inclined downward from its end connected to the wire pressing plate mounting shaft 2h to its other end, specifically, the wire pressing plate 2g is inclined downward from its left end to its right end, the wire pressing plate 2g is integrally formed into a L-shaped structure, a wiring screw 2e is disposed at a notch of the L-shaped structure of the wire pressing plate 2g and is screw-threadedly engaged with a nut member 2f disposed below the wire pressing plate 2g, specifically, the wiring screw 2e is disposed at a front side of an upper connecting portion 2g11 (a lower wire.

Preferably, a plurality of transverse grooves or transverse ribs arranged side by side are arranged on one side, facing the wire pressing plate 2g, of the wiring plate 2j, and the extending direction of the transverse grooves or the transverse ribs is perpendicular to the inserting direction of the wires.

It should be noted that, the connection terminal of the present invention may be used in the plug-in circuit breaker of the present invention, and the first outlet terminal 11 and the second outlet terminal 10 of the plug-in circuit breaker may be the connection terminal of the present invention, so as to improve the connection efficiency and the connection reliability. Further, still be equipped with supplementary tear line hole open on the circuit breaker casing, every leading-out terminal corresponds the cooperation with a supplementary tear line hole open, and supplementary tear line hole open sets up in binding screw 2e one side, sets up with line ball board 2g relatively. Further, the auxiliary wire-detaching hole is arranged opposite to one end, matched with the wiring board 2j, of the wire-pressing board 2 g. When the wire is removed, if the wire pressing plate 2g cannot automatically release the wire, the auxiliary wire removing hole can apply pressure to the wire pressing plate 2g, so that the wire pressing plate 2g releases the wire, and the wire removing efficiency is improved.

The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.

Claims

1. A plug-in circuit breaker comprising a circuit breaker housing and at least one protection pole, the circuit breaker housing comprising at least one protection pole assembly chamber; the protection device is characterized in that each protection pole comprises an operating button (1d), an operating mechanism (3) which is arranged in a protection pole assembly cavity and is connected with the operating button (1d) in a driving mode, a protection mechanism (4) which is matched with the operating mechanism (3) in a driving mode, an arc extinguishing system (5), a first wire inlet terminal (110), a first wire outlet terminal (11), a moving contact (61) which is connected with the operating mechanism (3) and a static contact (62) which is matched with the moving contact (61); one end of the operating button (1d) is inserted into the shell of the circuit breaker, the operating button (1d) and the first wire outgoing terminal (11) are arranged at one end of the shell of the circuit breaker, and the first wire incoming terminal (110) is arranged at the other end of the shell of the circuit breaker; the arc extinguishing system (5) is arranged in the middle of the protective electrode assembly cavity and located on one side of the first wire inlet terminal (110), the operating mechanism (3) is arranged between the operating button (1d) and the arc extinguishing system (5), and the protection mechanism (4) is arranged on one side of the operating mechanism (3) and located between the first wire outlet terminal (11) and the arc extinguishing system (5);

the plug-in circuit breaker is in a closing state, when a short-circuit fault or an overload fault occurs, the protection mechanism (4) drives the operating mechanism (3) to act to enable the plug-in circuit breaker to enter a switching-off state, and after the fault is eliminated, the operating button (1d) is pressed to enable the plug-in circuit breaker to move towards a closing direction to drive the operating mechanism (3) to act to enable the plug-in circuit breaker to enter the closing state.

2. Plug-in circuit breaker according to claim 1, characterized in that: the operating mechanism (3) comprises a U-shaped connecting rod (35), an operating handle (30), a contact supporting rod (31), a jump buckle (32), a lock catch (36), a lock catch return spring (37), a main pull spring (33) and a jump buckle return spring (38);

the operating handle (30) is arranged on the shell of the circuit breaker in a pivoting mode, one end of the operating handle (30) is connected with an operating button (1d) in a driving mode through a U-shaped connecting rod (35), the other end of the operating handle is connected with one end of a contact supporting rod (31) in a rotating mode, and a moving contact (61) is arranged at the other end of the contact supporting rod (31); one end of the trip buckle (32) is pivotally arranged on the shell of the circuit breaker, and the middle part of the trip buckle is connected with one end of the contact supporting rod (31) provided with the moving contact (61) through a main pull spring (33); the middle part of the lock catch (36) is rotatably arranged, one end of the lock catch is connected with the lock catch return spring (37), and the other end of the lock catch is in lock catch fit with the other end of the jump buckle (32) and is in driving fit with the protection mechanism (4); one end of the jump buckle reset spring (38) is connected with the breaker shell, and the other end of the jump buckle reset spring is connected with the jump buckle (32);

when the plug-in circuit breaker is in a closing state and a short-circuit fault or an overload fault occurs, the protection mechanism (4) drives the lock catch (36) and the trip catch (32) to release the lock catch cooperation, the plug-in circuit breaker trips, the trip catch reset spring (38) drives the trip catch (32) to rotate, the trip catch (32) and the lock catch (36) are enabled to be in lock catch cooperation again, and meanwhile, the plug-in circuit breaker enters a switching-off state.

3. Plug-in circuit breaker according to claim 2, characterized in that: the jump buckle (32) is of a U-shaped structure and comprises a first jump buckle arm (32a) and a second jump buckle arm (32b) which are arranged oppositely, the bottom of the U-shaped structure of the jump buckle (32) is close to one end, connected with the contact supporting rod (31), of the operating handle (30), one end of the first jump buckle arm (32a) is arranged in a pivoting mode, the other end of the first jump buckle arm is connected with the second jump buckle arm (32b), and the other end of the second jump buckle arm (32b) is matched with the lock catch (36) in a locking mode.

4. A plug-in circuit breaker according to claim 3, characterized in that: the jump buckle reset spring (38) is a torsion spring, is sleeved on a jump buckle reset spring shaft (380) positioned on one side of the jump buckle first arm (32a), and two ends of the jump buckle reset spring shaft (380) are respectively fixed on the shell of the circuit breaker; a jump buckle reset boss (323) is arranged in the middle of the jump buckle first arm (32a), one end of a jump buckle reset spring (38) is connected with the shell of the circuit breaker, and the other end of the jump buckle reset spring is connected with the jump buckle reset boss (323).

5. A plug-in circuit breaker according to claim 3, characterized in that: the operating mechanism (3) further comprises a linkage piece (44), the linkage piece (44) comprises a linkage rod (440) and a linkage shaft (441) arranged at one end of the linkage rod (440), two ends of the linkage shaft (440) are respectively pivoted on the circuit breaker shell, a polygonal hole (4410) is formed in the middle of the linkage shaft (440) along the axial direction of the linkage shaft, and a linkage piece driven table (442) is arranged on one side, opposite to the jump buckle (32), of the linkage rod (440); the jump buckle second arm (32b) is provided with a linkage piece driving table (322) which is in driving fit with the linkage piece driven table (442);

the plug-in circuit breaker comprises a plurality of protection poles, linkage shafts (441) of the protection poles are connected through a linkage piece connecting shaft, when one protection pole trips, a linkage piece driving table (322) of a tripping buckle (32) of the protection pole drives a linkage rod (440) to swing through a linkage piece driven table (442), the linkage rod (440) drives the linkage shafts (441) to rotate to drive linkage rods (440) of other protection poles to swing, and a lock catch (36) of each protection pole is knocked respectively to enable each protection pole to trip synchronously.

6. Plug-in circuit breaker according to claim 2, characterized in that: the contact supporting rod (31) is integrally of an arch structure, one end of the contact supporting rod (31) is provided with a supporting rod rotating shaft (311) which is rotationally connected with the operating handle (30), the other end of the contact supporting rod is provided with a moving contact (61), the moving contact (61) comprises a moving contact plate (610) connected with the contact supporting rod (31) and a moving contact (611) arranged at one end of the moving contact plate (610), and the other end of the moving contact plate (610) is connected with the main pull spring (33); the middle part of the contact supporting rod (31) is also provided with an arc isolating plate (34), when the plug-in circuit breaker is in an opening state, the arc isolating plate (34) enters between the moving contact (61) and the static contact (62), and when the plug-in circuit breaker is in a closing state, the arc isolating plate (34) moves out between the moving contact (61) and the static contact (62).

7. Plug-in circuit breaker according to claim 2, characterized in that: the protection mechanism (4) comprises a magnetic yoke (40) and a bimetallic strip (42), the magnetic yoke (40) is arranged on one side of the lock catch (36), the bimetallic strip (42) is arranged in the middle of the magnetic yoke (40) and is positioned between the magnetic yoke (40) and the lock catch (36), one end of the bimetallic strip (42) is fixedly arranged and is electrically connected with the first wire outgoing terminal (11), and the other end of the bimetallic strip is in driving fit with the lock catch (36) and is electrically connected with the movable contact (61);

when short-circuit fault occurs, the lock catch (36) is attracted to the direction of the magnetic yoke (40) to swing, and the lock catch is released from being matched with the lock catch of the jump buckle (32); when overload failure occurs, the bimetallic strip (42) drives the lock catch (36) to swing towards the direction of the magnetic yoke (40) to release the lock catch matching with the jump buckle (32).

8. Plug-in circuit breaker according to claim 7, characterized in that: the middle part of the lock catch (36) is rotatably arranged at one end of the magnetic yoke (40), one end of the lock catch (36) is connected with the shell of the circuit breaker through a lock catch return spring (37), and the other end of the lock catch (36) is opposite to the magnetic yoke (40); one end of the bimetal strip (42) which is fixedly arranged is electrically connected with the first wire outlet terminal (11) through the first conductive plate (2b), the other end of the bimetal strip is electrically connected with the contact supporting rod (31) through the flexible connection (63), and the static contact (62) is electrically connected with the first wire inlet terminal (110).

9. The plug-in circuit breaker according to claim 7, wherein the cross section of the magnetic yoke (40) is L-shaped, two magnetic yoke support arms (400) are oppositely arranged at one end of the magnetic yoke (40), a magnetic yoke limit groove (401) is arranged on the magnetic yoke support arms (400), the latch (36) comprises a latch reset end (360), a latch support arm (361), a latch main body (362), a latch hole (363) and a latch driven end (364), the latch reset end (360), the latch main body (362) and the latch driven end (364) are sequentially connected, two latches (361) are respectively arranged on two sides of a joint of the latch reset end (360) and the latch main body (362), the latch driven end (364) is L-shaped, one end of the latch driven end is bent and connected with the latch main body (362), the other end of the latch reset end is in driving fit with the bimetallic strip (42), the two latch support arms (401) are respectively arranged in the two magnetic yoke limit grooves (401), the latch main body (362) is oppositely arranged with the magnetic yoke (400), and the latch hole (363) is arranged on the latch main body (362.

10. Plug-in circuit breaker according to claim 1, characterized in that: the arc extinguishing system (5) comprises an arc extinguishing chamber (50), and a moving contact arc striking plate (51) and a static contact arc striking plate (52) which are respectively arranged on two sides of the arc extinguishing chamber (50); the moving contact arc striking plate (51) is matched with the moving contact (61) and is electrically connected with the first wire outlet terminal (11), one end of the static contact arc striking plate (52) is provided with a static contact (62), and the other end of the static contact arc striking plate is electrically connected with the first wire inlet terminal (110);

the circuit breaker further comprises a locking mechanism, wherein the locking mechanism comprises a first locking piece (9), one end of the first locking piece (9) is arranged in the circuit breaker shell in a sliding mode, and the other end of the first locking piece (9) is provided with a first bulge (90) protruding out of the circuit breaker shell;

when the plug-in circuit breaker is assembled with the circuit breaker assembling position, the shell of the circuit breaker assembling position extrudes the first bulge (90) to enable the first locking piece (9) to integrally move towards the interior of the circuit breaker shell, and after the plug-in circuit breaker is assembled in place, the first bulge (90) protrudes out of the circuit breaker shell to be in limit fit with the shell of the circuit breaker shell assembling position;

the locking mechanism further comprises a second locking piece (8), the middle part of the second locking piece (8) is rotatably arranged, one end of the second locking piece is in driving fit with the operating button (1d), and the other end of the second locking piece is in driving fit with the first locking piece (9); when the plug-in circuit breaker is in a switching-off state, the first bulge (90) is driven to move towards the inner direction of the circuit breaker shell by pulling the operating button (1d) through the second locking piece (8), and the limiting fit between the first bulge (90) and the shell of the circuit breaker assembly is released;

the second locking piece (8) further comprises a second protrusion (82), and the second protrusion (82) is arranged at one end, matched with the first locking piece (9), of the second locking piece (8);

when the plug-in circuit breaker is in a closing state, the operating button (1d) drives the second locking piece (8) to enable the second protrusion (82) to protrude out of the shell of the circuit breaker; when the plug-in circuit breaker is in a switching-off state, the operating button (1d) drives the second locking piece (8) to enable the second protrusion (82) to move into the circuit breaker shell.