CN217606056U - Electric leakage test circuit of circuit breaker and circuit breaker - Google Patents

Abstract

The utility model relates to the field of low-voltage electricity, in particular to a leakage test circuit breaker, which comprises a test button, a switch elastic piece, a matching conductive structure and a middle conductive structure which are sequentially connected in series; a switch arm of the switch elastic piece is in driving fit with the test button, and a connecting arm is fixedly arranged; a matching arm matched with the elastic piece of the conductive structure is in driving matching with an operating mechanism of the circuit breaker, and the fixed arm is fixedly arranged; the matching arm is disconnected with the middle conductive structure when the breaker is in a brake-off state; when the circuit breaker is switched to a closing state, the operating mechanism drives the matching arm to be in contact conduction with the middle conductive structure; the switch arm and the matching conductive structure are kept in a disconnected state, and the test button is pressed to drive the switch arm to be in contact conduction with the matching conductive structure; the electric leakage test circuit is simple in structure, reliable in action and good in safety. The utility model discloses still relate to one kind and include the circuit breaker of electric leakage test circuit, its inner structure is simple, and the security is good, can carry out electric leakage simulation test.

Description

Electric leakage test circuit of circuit breaker and circuit breaker

Technical Field

The utility model relates to a low pressure electric field, concretely relates to electric leakage test circuit breaker of circuit breaker and one kind include the circuit breaker of electric leakage test circuit.

Background

During normal use, the residual current operated circuit breaker requires that electric leakage simulation test operation is performed at intervals, and after a test button is pressed down, a product can simulate electric leakage action and cut off a circuit so as to ensure normal use of the electric leakage protection function of the product; in order to realize the above functions of the residual current operated circuit breaker, it is necessary to provide a leakage test circuit in the circuit breaker.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects of the prior art and provide a leakage test circuit breaker of a circuit breaker, which has simple structure, reliable action and good safety; the circuit breaker comprises the electric leakage test circuit, is simple in internal structure and good in safety, and can perform electric leakage simulation test.

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

the electric leakage test circuit of the circuit breaker comprises a test button, a switch elastic piece, a matching conductive structure and a middle conductive structure, wherein the switch elastic piece, the matching conductive structure and the middle conductive structure are sequentially connected between a phase circuit and an N-pole circuit of the circuit breaker in series;

the circuit breaker is in a brake-off state, and the matching arm is disconnected with the middle conductive structure; when the breaker is switched from an opening state to a closing state, the operating mechanism drives the matching arm to be in contact conduction with the middle conductive structure;

the switch arm and the matching conductive structure are kept in a disconnected state, and the test button is pressed to drive the switch arm to be in contact conduction with the matching conductive structure.

Preferably, the matching elastic piece is a matching torsion spring, and the two ends of the matching elastic piece are a matching arm and a fixed arm; the switch elastic piece is a switch torsion spring, and a switch arm and a connecting arm are arranged at two ends of the switch elastic piece; the matching conductive structure also comprises a matching torsion spring shaft, and the matching torsion spring is sleeved on the matching torsion spring shaft; and pressing the test button to drive the switch arm to be in contact conduction with the matched torsion spring shaft.

Preferably, the switch arm comprises a first switch arm section, a second switch arm section and a third switch arm section which are sequentially connected, two ends of the third switch arm section are respectively connected with a switch torsion spring coil of the switch torsion spring and the second switch arm section, the second switch arm section is in driving fit with the test button, and the first switch arm section is matched with the matching torsion spring shaft and is crossed in space.

Preferably, the circuit breaker further comprises an electromagnetic trip for driving the operating mechanism to trip, the electromagnetic trip comprises a magnetic yoke electrically connected with the first fixed contact of the circuit breaker, and the magnetic yoke is of a middle conductive structure.

Preferably, the first fixed contact and the middle conductive structure are of an integrated structure.

Preferably, the middle conductive structure includes a yoke bottom plate, a first yoke arm and a second yoke arm, the first yoke arm and the second yoke arm are oppositely disposed and respectively connected with two ends of the yoke bottom plate in a bending manner, the first yoke arm is matched with the matching arm, and the first fixed contact and the first yoke arm are connected with the same end of the yoke bottom plate and respectively bent towards two sides of the yoke bottom plate.

Preferably, operating device includes handle and first connecting rod, and the handle rotates the setting, and first connecting rod one end rotates with the handle and links to each other, and the other end cooperates with the cooperation arm drive, and when the circuit breaker switched to the combined floodgate state by the separating brake state, the drive cooperation arm was connected with middle conducting structure contact electricity.

Preferably, the operating mechanism further comprises a second connecting rod, a tripping piece, a locking piece and a lever, wherein the lever, the tripping piece and the locking piece are respectively rotatably arranged, one end of the first connecting rod is rotatably connected with the handle, the other end of the first connecting rod is rotatably connected with one end of the second connecting rod and is slidably arranged in a waist-shaped hole of the tripping piece in the middle of the tripping piece, the other end of the second connecting rod is connected with the lever in a driving manner, the lever is connected with a moving contact of the circuit breaker in a driving manner, the tripping piece is in hasp fit with the locking piece, and the locking piece is driven by external force to rotate so as to be disengaged from the hasp fit of the tripping piece.

Preferably, the matching arm is of a zigzag structure and comprises a first matching arm section, a second matching arm section and a third matching arm section which are sequentially connected, two ends of the third matching arm section are respectively connected with a matching torsion spring coil of a matching torsion spring and the second matching arm section, the first matching arm section is matched with the middle conducting structure, and the second matching arm section is matched with the first connecting rod.

Preferably, test button, switch elastic component, cooperation conducting structure are located one side of handle, and the switch elastic component is the switch torsional spring, and the cooperation elastic component is the cooperation torsional spring, and the parallel interval of axis of switch torsional spring and cooperation torsional spring sets up, and test button and handle are the interval side by side and are set up in the casing one end of circuit breaker, and test button's moving direction is perpendicular with the axial of switch torsional spring and cooperation torsional spring.

Preferably, the electric leakage test circuit further comprises a current-limiting resistor and a zero sequence transformer winding, the current-limiting resistor is connected in series between the connecting arm and the N-pole wiring terminal of the circuit breaker, the zero sequence transformer winding is connected in series between the middle conductive structure and the phase-pole wiring terminal of the circuit breaker, and the N-pole wiring terminal and the phase-pole wiring terminal are both wire-in terminals or wire-out terminals.

Preferably, the first fixed contact, the first moving contact correspondingly matched with the first fixed contact, and the bimetallic strip of the circuit breaker are sequentially connected in series between the middle conductive structure and the zero sequence transformer winding.

A circuit breaker comprises the electric leakage test circuit.

The utility model discloses leakage test circuit of circuit breaker, a structure is simple, the action is reliable, between switch elastic component's switch arm and cooperation conductive structure, respectively be equipped with a breakpoint between cooperation arm and the middle conductive structure of cooperation elastic component, only after the circuit breaker combined floodgate, also be promptly cooperation arm and middle conductive structure contact switch on the back, press the test button with the drive switch arm with the contact of cooperation conductive structure switch on, just enable leakage test circuit and effectively switch on, consequently, the circuit breaker has been avoided under the separating brake state, because of operating personnel's maloperation, the condition that makes leakage test circuit switch on takes place, the security has been improved.

The utility model discloses circuit breaker, it includes electric leakage test circuit, its inner structure is simple, and the security is good, can carry out electric leakage simulation test.

Drawings

Fig. 1 is a schematic structural diagram of the circuit breaker in the opening state of the present invention;

fig. 2 is a schematic structural diagram of the leakage test circuit of the circuit breaker in the open state of the utility model;

fig. 3 is a schematic structural diagram of the circuit breaker in a closing state of the present invention;

fig. 4 is a schematic structural diagram of the leakage test circuit of the circuit breaker in a closing state;

fig. 5 is a schematic view of the fitting structure of the test button and the switch elastic member of the present invention;

FIG. 6 is a schematic structural view of the elastic member of the present invention;

fig. 7 is a schematic structural diagram of the test button of the present invention.

Detailed Description

The following description will further describe a specific embodiment of the circuit breaker according to the present invention with reference to the embodiments shown in fig. 1 to 7. The circuit breaker of the present invention is not limited to the description of the following embodiments.

As shown in fig. 1 and 3, the utility model discloses circuit breaker includes casing h0 and sets up operating device and the contact system in casing h0, and the contact system includes moving contact and the static contact that the cooperation was used, and operating device links to each other with the moving contact drive in order to drive moving contact and static contact closure or disconnection, also makes circuit breaker combined floodgate or separating brake. Further, the utility model discloses the circuit breaker includes N utmost point circuit and at least one phase pole circuit, and N utmost point circuit is connected with the neutral line of power, and phase pole circuit is connected with the phase line electricity of power, and N utmost point circuit and phase pole circuit all are equipped with contact system, or only set up contact system and N utmost point circuit at the phase pole circuit is direct utmost point circuit (also do not set up the breakpoint in the N utmost point circuit), and each contact system's moving contact all links to each other with the operating device drive.

As shown in fig. 1-4, the circuit breaker of the present invention further includes a leakage testing circuit, the leakage testing circuit includes a testing button, and a switching elastic member 2, a matching conductive structure and a middle conductive structure 7 which are sequentially connected in series between a phase circuit and an N-pole circuit of the circuit breaker, the switching elastic member 2 includes a switching arm 21 and a connecting arm 22, the switching arm 21 is in driving fit with the testing button 1, the connecting arm 22 is fixedly disposed, the matching conductive structure includes a matching elastic member 3, the matching elastic member 3 includes a matching arm 31 and a fixing arm 32, the matching arm 31 is in driving fit with an operating mechanism of the circuit breaker, and the fixing arm 32 is fixedly disposed; when the breaker is in an opening state, the matching arm 31 is disconnected with the middle conductive structure 7; when the breaker is switched from an opening state to a closing state, the operating mechanism drives the matching arm 31 to be in contact conduction with the middle conductive structure 7; the switch arm 21 and the matching conductive structure are kept in a disconnected state, the test button 1 is pressed to drive the switch arm 21 to be in contact conduction with the matching conductive structure, a test circuit of the circuit breaker is conducted, and whether the circuit breaker is in electric leakage tripping or not is monitored.

It should be noted that, when the circuit breaker is a two-phase circuit breaker, the phase circuit is an L-pole circuit, and therefore the switch elastic element 2, the matching conductive structure and the middle conductive structure 7 of the leakage test circuit are sequentially connected in series between the L-pole circuit and the N-pole circuit. When the circuit breaker is a three-phase circuit breaker, a four-phase circuit breaker or more phase circuit breakers, the switch elastic piece 2, the matching conducting structure and the middle conducting structure 7 of the electric leakage test circuit are sequentially connected in series between the N-pole circuit and the phase-pole circuit of any phase.

The electric leakage test circuit is simple in structure and reliable in action, a breakpoint is respectively arranged between the switch arm 21 of the switch elastic piece and the matched conductive structure and between the matched arm 31 of the matched elastic piece 3 and the middle conductive structure 7, and only after the circuit breaker is switched on, namely after the matched arm 31 is in contact conduction with the middle conductive structure 7, the test button 1 is pressed to drive the switch arm 21 to be in contact conduction with the matched conductive structure, so that the electric leakage test circuit can be effectively conducted, the situation that the electric leakage test circuit is conducted due to misoperation of an operator when the circuit breaker is in a switching-off state is avoided, and the safety is improved.

Specifically, as shown in fig. 1 and 3, the connecting arm 22 of the switch elastic member 2 and the fixing arm 32 of the engaging elastic member 3 are respectively engaged with the housing h0 to achieve the fixed arrangement of the two.

As shown in fig. 1-4, the matching elastic member 3 is a matching torsion spring, and its two ends are a matching arm 31 and a fixing arm 32 respectively; the switch elastic member 2 is a switch torsion spring, and two ends of the switch torsion spring are respectively a switch arm 21 and a connecting arm 22.

As shown in fig. 1-4, the matching conductive structure further includes a matching torsion spring shaft 9, and the matching torsion spring is sleeved on the matching torsion spring shaft 9; pressing the test button 1 makes the driving switch arm 21 contact with the matching torsion spring shaft 9. Further, the fitting torsion spring shaft 9 is provided on the housing h 0.

As shown in fig. 2 and 4-6, the switch arm 21 includes a first switch arm section 21-0, a second switch arm section 21-1 and a third switch arm section 21-2, which are connected in sequence, two ends of the third switch arm section 21-2 are respectively connected to the switch torsion spring coil 20 of the switch torsion spring and the second switch torsion spring section 21-1, the second switch arm section 21-1 is in driving fit with the test button 1, and the first switch arm section 21-0 is in fit with the fitting torsion spring shaft 9 and is crossed in space. Further, the second section 21-1 of the switch arm is parallel to the axial direction of the switch torsion spring 2; the first switch section 21-0 is spatially orthogonal to the mating torsion spring shaft 9 and the first switch arm section 21-0 is spatially orthogonal to the third switch arm section 21-2.

As another embodiment, in the closed state of the circuit breaker, the switch arm 21 of the switch elastic member 2 may be directly in contact with the mating elastic member 3 for conduction.

As shown in fig. 5 and 7, the test button 1 includes a button operation part 1-0 protruding outside the housing h0 for operation, one end of the button operation part located inside the housing h0 is provided with a button driving surface 1-00, and the button driving surface 1-00 is in abutting engagement with the second segment 21-1 of the switch arm.

Specifically, as shown in fig. 3 and 4, when the test button 1 is pressed downward, the test button 1 presses the second switch arm segment 21-1 of the switch arm 21 via the button driving surface 1-00 to rotate counterclockwise, until the second switch arm segment 21-1 contacts and conducts with the matching torsion spring shaft 9.

As shown in fig. 1 and 3, the operating mechanism includes a handle 1a and a first connecting rod 2a, an operator stirs the handle 1a to drive the circuit breaker to switch on or switch off through the operating mechanism, the handle 1a is rotatably disposed, one end of the first connecting rod 2a is rotatably connected with the handle 1a, the other end of the first connecting rod is in driving fit with a matching arm 31 of a matching elastic member 3, and when the circuit breaker is switched from a switch-off state to a switch-on state, the matching arm 31 is driven to be in contact with the middle conductive structure 7 and electrically connected. Furthermore, the operating mechanism further comprises a second connecting rod, a tripping element, a locking element and a lever 6a, wherein the lever 6a, the tripping element and the locking element are respectively rotatably arranged, one end of the first connecting rod 2a is rotatably connected with the handle 1a, the other end of the first connecting rod is rotatably connected with one end of the second connecting rod and is slidably arranged in a waist-shaped hole of the tripping element in the middle of the tripping element, the other end of the second connecting rod is connected with the lever 6a in a driving manner, the lever 6a is connected with a movable contact 11a of the circuit breaker in a driving manner, the tripping element is in hasp fit with the locking element, and the locking element is driven by external force to rotate so as to remove the hasp fit with the tripping element, so that the operating mechanism is tripped. When the handle rotates to realize the switching-off or switching-on operation through the first connecting rod 2a and the second connecting rod driving lever 6a, the first connecting rod 2a and the second connecting rod are hinged and inserted into one end of the waist-shaped hole of the jump fastener to move along the waist-shaped hole of the jump fastener, a tripping component formed by the jump fastener and the locking fastener of the operating mechanism is relatively independent from a transmission component formed by the second connecting rod, the third connecting rod and the lever 14, and the jump fastener and the locking fastener do not rotate when in hasp matching, so that the transmission stability is high. Specifically, the handle 1a, the trip piece, the locking piece and the lever 6a are respectively and rotatably arranged on the shell h0, the operating mechanism adopts a cam-five-link mechanism, and the external force for driving the trip piece to rotate can come from a short-circuit protection mechanism (namely an electromagnetic trip), an overload protection mechanism or a shunt trip.

As another embodiment, other components of the operating mechanism (for example, the lever 6a, the second link, etc.) may be used to drive the engaging arm 31 to be in contact with the intermediate conductive structure 7 when the circuit breaker is switched between the open state and the closed state.

As shown in fig. 1-4, the engagement arm 31 has a zigzag structure, and includes a first engagement arm section 31-0, a second engagement arm section 31-1, and a third engagement arm section 31-2, which are connected in sequence, wherein two ends of the third engagement arm section 31-2 are respectively connected to the engagement torsion spring coil 30 of the engagement torsion spring and the second engagement arm section 31-1, the first engagement arm section 31-0 is engaged with the middle conductive structure 7, and the second engagement arm section 31-1 is engaged with the first connection rod 2 a. Further, the first link 2a is a U-shaped link, one arm of which is in driving fit with the second section 31-1 of the fitting arm and is crossed in space.

As shown in fig. 1-4, the utility model discloses the circuit breaker is still including the electromagnetism release that is used for driving the operating device release, and the electromagnetism release includes the yoke that links with the first static contact 10a electricity of circuit breaker, and the yoke is middle conductive structure 7. Further, the first stationary contact 10a and the middle conductive structure 7 are of an integrated structure. Further, the first fixed contact 10a is a fixed contact of a phase electrode circuit or a fixed contact of an N-pole circuit.

As shown in fig. 1 to 4, the intermediate conductive structure 7 includes a yoke base plate 70, a first yoke arm 71 and a second yoke arm 72, the first yoke arm 71 and the second yoke arm 72 are disposed opposite to each other and respectively connected to two ends of the yoke base plate 70 in a bent manner, the first yoke arm 71 is matched with the matching arm 30, and the first stationary contact 10a and the first yoke arm 71 are connected to the same end of the yoke base plate 70 and respectively bent toward two sides of the yoke base plate 70. Further, the first yoke arm 71 extends in a direction spatially crossing the first section 31-0 of the engagement arm 31.

Specifically, as shown in fig. 1 and 3, when the handle 1a rotates clockwise to drive the circuit breaker to switch from the opening state to the closing state through the operating mechanism, the handle 1a drives the first connecting rod 2a to move to the left, and the left end of the first connecting rod 2a abuts against the second section 31-1 of the matching arm, so that the matching arm 31 rotates clockwise, and the first section 31-0 of the matching arm is in contact with and conducted with the first yoke arm 71 of the middle conductive structure 7.

As shown in fig. 1-4, the leakage testing circuit further includes a current-limiting resistor 5 and a zero-sequence transformer winding 10, the current-limiting resistor 5 is connected in series between the connecting arm 22 and the N-pole connecting terminal 8N of the circuit breaker, and the zero-sequence transformer winding 10 is connected in series between the middle conductive structure 7 and the phase-pole connecting terminal 8L of the circuit breaker; the N-pole wiring terminal 8N and the phase-pole wiring terminal 8L are both an incoming line terminal or an outgoing line terminal. Further, as shown in fig. 1 and 3, the utility model discloses the circuit breaker still includes bimetallic strip 8a, first static contact 10a, correspond the first moving contact 11a of complex with first static contact 10a, bimetallic strip 8a establishes ties in proper order between middle conductive structure 7 and zero sequence transformer winding 10, make the circuit breaker under the separating brake state, form three breakpoint in the electric leakage test circuit, the breakpoint between cooperation arm 31 and middle conductive structure 7, the breakpoint between switch arm 21 and the cooperation conductive structure and the breakpoint between first static contact 10a and the first moving contact 11a respectively. Furthermore, the moving contact 11a is electrically connected with the bimetallic strip 8a through a flexible connection 7a, the bimetallic strip 8a is electrically connected with the zero sequence transformer winding 10 through a supporting piece 9a and is fixed on the casing h0 through the supporting piece 9a, and the current limiting resistor 5 is electrically connected with N and the connecting terminal 8N through a conducting 6.

Specifically, the utility model discloses the circuit breaker is double-phase circuit breaker, and phase utmost point binding post 8L also is the L utmost point binding post of circuit breaker.

As shown in fig. 1 to 4, a layout of the leakage test circuit is as follows: test button 1, switch torsional spring, cooperation conducting structure are located one side of handle 1a, and the parallel interval of axis of switch torsional spring and cooperation torsional spring sets up, and test button 1 and handle 1a interval sets up in casing h0 one end side by side, and test button 1's moving direction is perpendicular with the axial of switch torsional spring and cooperation torsional spring. Furthermore, the current-limiting resistor 5 and the zero sequence transformer winding 10 are located on the other side of the handle 1a, and the N-pole wiring terminal 8N and the phase-pole wiring terminal 8L are stacked in the thickness direction of the circuit breaker.

The foregoing is a more detailed description of the present invention, taken in conjunction with the specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments shown and described. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement, all should regard as belonging to the utility model discloses a protection scope.

Claims (13)

1. The utility model provides a leakage test circuit of circuit breaker which characterized in that: the leakage test circuit comprises a test button (1), a switch elastic piece (2), a matching conductive structure and a middle conductive structure (7), wherein the switch elastic piece (2) is sequentially connected between a phase circuit and an N-pole circuit of the circuit breaker in series, the switch elastic piece (2) comprises a switch arm (21) and a connecting arm (22), the switch arm (21) is in driving fit with the test button (1), the connecting arm (22) is fixedly arranged, the matching conductive structure comprises a matching elastic piece (3), the matching elastic piece (3) comprises a matching arm (31) and a fixing arm (32), the matching arm (31) is in driving fit with an operating mechanism of the circuit breaker, and the fixing arm (32) is fixedly arranged;

when the breaker is in an opening state, the matching arm (31) is disconnected with the middle conductive structure (7); when the breaker is switched from an opening state to a closing state, the operating mechanism drives the matching arm (31) to be in contact conduction with the middle conducting structure (7);

the switch arm (21) and the matching conductive structure are kept in an off state, and the test button (1) is pressed to drive the switch arm (21) to be in contact conduction with the matching conductive structure.

2. The leakage test circuit of a circuit breaker according to claim 1, wherein: the matching elastic piece (3) is a matching torsion spring, and a matching arm (31) and a fixed arm (32) are arranged at two ends of the matching elastic piece; the switch elastic piece (2) is a switch torsion spring, and a switch arm (21) and a connecting arm (22) are arranged at two ends of the switch torsion spring; the matching conductive structure also comprises a matching torsion spring shaft (9), and the matching torsion spring is sleeved on the matching torsion spring shaft (9); and pressing the test button (1) to drive a switch arm (21) to be in contact conduction with a matched torsion spring shaft (9).

3. The leakage test circuit of a circuit breaker according to claim 2, wherein: the switch arm (21) comprises a first switch arm section (21-0), a second switch arm section (21-1) and a third switch arm section (21-2) which are sequentially connected, two ends of the third switch arm section (21-2) are respectively connected with a switch torsion spring coil (20) of a switch torsion spring and the second switch arm section (21-1), the second switch arm section (21-1) is in driving fit with a test button (1), and the first switch arm section (21-0) is matched with a matched torsion spring shaft (9) and is crossed in space.

4. The leakage test circuit of a circuit breaker according to claim 1, wherein: the circuit breaker further comprises an electromagnetic trip used for driving the operating mechanism to trip, the electromagnetic trip comprises a magnetic yoke electrically connected with a first fixed contact (10 a) of the circuit breaker, and the magnetic yoke is of a middle conductive structure (7).

5. The leakage test circuit of a circuit breaker according to claim 4, wherein: the first fixed contact (10 a) and the middle conductive structure (7) are of an integrated structure.

6. The leakage test circuit of a circuit breaker according to claim 5, wherein: the middle conducting structure (7) comprises a magnetic yoke bottom plate (70), a first magnetic yoke arm (71) and a second magnetic yoke arm (72), the first magnetic yoke arm (71) and the second magnetic yoke arm (72) are oppositely arranged and are respectively bent and connected with two ends of the magnetic yoke bottom plate (70), the first magnetic yoke arm (71) is matched with the matching arm (31), and the first static contact (10 a) and the first magnetic yoke arm (71) are connected with the same end of the magnetic yoke bottom plate (70) and are respectively bent towards two sides of the magnetic yoke bottom plate (70).

7. The leakage test circuit of a circuit breaker according to claim 1, wherein: operating device includes handle (1 a) and first connecting rod (2 a), and handle (1 a) rotates to set up, and first connecting rod (2 a) one end rotates with handle (1 a) and links to each other, and the other end and cooperation arm (31) drive cooperation, when the circuit breaker switched to the state of closing a floodgate by the separating brake state, drive cooperation arm (31) and middle conducting structure (7) contact electricity even.

8. The leakage test circuit of a circuit breaker according to claim 7, wherein: the operating mechanism further comprises a second connecting rod, a tripping piece, a locking piece and a lever (6 a), wherein the lever (6 a), the tripping piece and the locking piece are respectively arranged in a rotating mode, one end of a first connecting rod (2 a) is connected with the handle (1 a) in a rotating mode, the other end of the first connecting rod is connected with one end of the second connecting rod in a rotating mode and is arranged in a tripping piece kidney-shaped hole in the middle of the tripping piece in a sliding mode, the other end of the second connecting rod is connected with the lever (6 a) in a driving mode, the lever (6 a) is connected with a movable contact (11 a) of the circuit breaker in a driving mode, the tripping piece is in hasp fit with the locking piece, and the locking piece is driven by external force to rotate to enable the locking piece to be released from hasp fit with the tripping piece.

9. The leakage test circuit of a circuit breaker according to claim 7, wherein: the matching arm (31) is of a zigzag structure and comprises a first matching arm section (31-0), a second matching arm section (31-1) and a third matching arm section (31-2) which are sequentially connected, the matching elastic piece (3) is a matching torsion spring, two ends of the third matching arm section (31-2) are respectively connected with a matching torsion spring coil (30) of the matching torsion spring and the second matching arm section (31-1), the first matching arm section (31-0) is matched with the middle conductive structure (7), and the second matching arm section (31-1) is matched with the first connecting rod (2 a).

10. The leakage test circuit of a circuit breaker according to claim 7, wherein: test button (1), switch elastic component (2), cooperation conducting structure are located one side of handle (1 a), and switch elastic component (2) are the switch torsional spring, and cooperation elastic component (3) are the cooperation torsional spring, and the parallel interval of axis of switch torsional spring and cooperation torsional spring sets up, and test button (1) and handle (1 a) set up casing (h 0) one end at the circuit breaker side by side the interval, and the moving direction of test button (1) is perpendicular with the axial of switch torsional spring and cooperation torsional spring.

11. The leakage test circuit of a circuit breaker according to claim 1, wherein: the electric leakage test circuit further comprises a current-limiting resistor (5) and a zero sequence transformer winding (10), wherein the current-limiting resistor (5) is connected in series between the connecting arm (22) and the N pole wiring terminal (8N) of the circuit breaker, the zero sequence transformer winding (10) is connected in series between the middle conductive structure (7) and the phase pole wiring terminal (8L) of the circuit breaker, and the N pole wiring terminal (8N) and the phase pole wiring terminal (8L) are both wire inlet terminals or wire outlet terminals.

12. The leakage test circuit of a circuit breaker according to claim 11, wherein: a first fixed contact (10 a), a first movable contact (11 a) correspondingly matched with the first fixed contact (10 a) and a bimetallic strip (8 a) of the circuit breaker are sequentially connected in series between the middle conductive structure (7) and the zero sequence transformer winding (10).

13. A circuit breaker, characterized in that it comprises a leakage test circuit according to any one of claims 1 to 12.

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