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

Circuit breaker leakage test circuit and circuit breaker

technical field

The utility model relates to the low-voltage electrical field, in particular to a leakage test circuit breaker of a circuit breaker and a circuit breaker including the leakage test circuit.

Background technique

During the normal use of the residual current circuit breaker, it is required to perform a leakage simulation test operation at regular intervals. After pressing the test button, the product can simulate the leakage action and cut off the circuit to ensure the normal use of the leakage protection function of the product; For the above functions of the current-operated circuit breaker, it is necessary to set up a leakage test circuit in the circuit breaker.

Utility model content

The purpose of the utility model is to overcome the defects of the prior art, and to provide a leakage test circuit breaker of a circuit breaker, which is simple in structure, reliable in operation and good in safety; and also provides a circuit breaker including the leakage test circuit, which is The internal structure is simple, the safety is good, and the leakage simulation test can be carried out.

To achieve the above object, the utility model adopts the following technical solutions:

A leakage test circuit of a circuit breaker, the leakage test circuit includes a test button, a switch elastic member, a matching conductive structure and an intermediate conductive structure sequentially connected in series between a phase-pole circuit and an N-pole circuit of the circuit breaker, and the switch elastic member includes The switch arm and the connecting arm, the switch arm is driven and matched with the test button, the connecting arm is fixedly arranged, the matching conductive structure includes a matching elastic piece, the matching elastic piece includes a matching arm and a fixed arm, the matching arm is driven and matched with the operating mechanism of the circuit breaker, and the fixed arm fixed settings;

When the circuit breaker is in an open state, the cooperating arm is disconnected from the intermediate conductive structure; when the circuit breaker is switched from the open state to the closed state, the operating mechanism drives the cooperating arm and the intermediate conductive structure to contact and conduct;

The switch arm and the mating conductive structure are kept disconnected, and the test button is pressed to make the driving switch arm and the mating conductive structure contact and conduct.

Preferably, the matching elastic member is a matching torsion spring, the two ends of which are a matching arm and a fixed arm; the switch elastic member is a switching torsion spring, whose two ends are a switching arm and a connecting arm; the matching conductive structure further includes: The matching torsion spring shaft is sleeved on the matching torsion spring shaft; the test button is pressed to make the drive switch arm and the matching torsion spring shaft contact and conduct.

Preferably, the switch arm comprises a first segment of the switch arm, a second segment of the switch arm and a third segment of the switch arm, and both ends of the third segment of the switch arm are respectively connected to the switch torsion coil of the switch torsion spring and the first segment of the switch arm. The two sections are connected, the second section of the switch arm is driven and matched by the test button, and the first section of the switch arm is matched with the matching torsion spring shaft and intersects in space.

Preferably, the circuit breaker further includes an electromagnetic release for driving the operating mechanism to trip, the electromagnetic release includes a magnetic yoke electrically connected to the first static contact of the circuit breaker, and the magnetic yoke is an intermediate conductive structure.

Preferably, the first static contact and the intermediate conductive structure are integral structures.

Preferably, the intermediate conductive structure includes a yoke base plate, a first yoke arm and a second yoke arm, the first yoke arm and the second yoke arm are arranged opposite to each other and are respectively connected to both ends of the yoke base plate by bending The first magnetic yoke arm is matched with the matching arm, and the first static contact and the first magnetic yoke arm are connected to the same end of the magnetic yoke base plate and are respectively bent to both sides of the magnetic yoke base plate.

Preferably, the operating mechanism includes a handle and a first connecting rod, the handle is set to rotate, one end of the first connecting rod is connected to the handle in rotation, and the other end is drivingly cooperated with the matching arm. When the circuit breaker is switched from the open state to the closed state , the drive matching arm is in contact and electrically connected with the middle conductive structure.

Preferably, the operating mechanism further includes a second link, a jumper, a lock and a lever, the lever, the jumper and the lock are respectively arranged to rotate, one end of the first link is rotatably connected to the handle, and the other end is connected to the handle. One end of the second connecting rod is rotatably connected and is slidably arranged in the waist-shaped hole of the jumping buckle in the middle of the jumping buckle. The other end of the second connecting rod is drivingly connected with the lever, and the lever is drivingly connected with the moving contact of the circuit breaker. The locking piece is snap-fitted, and the locking piece is driven by an external force to rotate to release the snap fit with the jumping piece.

Preferably, the cooperating arm has a zigzag structure, comprising a first section of the cooperating arm, a second section of the cooperating arm and a third section of the cooperating arm, which are connected in sequence. The coil is connected with the second section of the matching arm, the first section of the matching arm is matched with the middle conductive structure, and the second section of the matching arm is matched with the first connecting rod.

Preferably, the test button, the switch elastic member and the matching conductive structure are located on one side of the handle, the switch elastic member is a switch torsion spring, the matching elastic member is a matching torsion spring, and the axes of the switch torsion spring and the matching torsion spring are arranged in parallel and spaced apart, The test button and handle are arranged side by side at one end of the casing of the circuit breaker, and the moving direction of the test button is perpendicular to the axial direction of the switch torsion spring and the matching torsion spring.

Preferably, the leakage test circuit further includes 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 terminal of the circuit breaker, and the zero-sequence transformer winding is connected in series between the intermediate conductive structure and the circuit breaker Between the phase-pole terminals of the inverter, the N-pole terminal and the phase-pole terminal are both incoming terminals or outgoing terminals.

Preferably, the first static contact of the circuit breaker, the first movable contact corresponding to the first static contact, and the bimetallic sheet are connected in series between the intermediate conductive structure and the zero-sequence transformer winding in sequence.

A circuit breaker includes the leakage test circuit.

The leakage test circuit of the circuit breaker of the utility model has the advantages of simple structure and reliable operation, and a breakpoint is respectively provided between the switch arm of the switch elastic piece and the matching conductive structure, and between the matching arm of the matching elastic piece and the middle conductive structure, Only after the circuit breaker is closed, that is, after the matching arm is in contact with the intermediate conductive structure, press the test button to drive the switch arm and the matching conductive structure to contact and conduct, so that the leakage test circuit can be effectively conducted, thus avoiding open circuit. When the device is in the open state, due to the misoperation of the operator, the leakage test circuit is turned on, which improves the safety.

The circuit breaker of the utility model includes the leakage test circuit, the internal structure is simple, the safety is good, and the leakage simulation test can be performed.

Description of drawings

Fig. 1 is the structural representation of the circuit breaker in the open state of the present utility model;

Fig. 2 is the structural representation of the leakage test circuit of the circuit breaker of the present utility model in the open state;

3 is a schematic structural diagram of the circuit breaker in the closed state of the present invention;

4 is a schematic structural diagram of the leakage test circuit of the circuit breaker of the present utility model in a closed state;

5 is a schematic diagram of the matching structure of the test button and the switch elastic member of the present invention;

Fig. 6 is the structural schematic diagram of the present utility model with the elastic member;

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

Detailed ways

The specific embodiments of the circuit breaker of the present invention will be further described below with reference to the embodiments given in the accompanying drawings 1-7. The circuit breaker of the present invention is not limited to the description of the following embodiments.

As shown in Figures 1 and 3, the circuit breaker of the present invention includes a housing h0, an operating mechanism and a contact system arranged in the housing h0, and the contact system includes a movable contact and a static contact used in conjunction with the operating mechanism. The moving contact is driven to connect to drive the moving contact to close or open the static contact, that is, to close or open the circuit breaker. Further, the circuit breaker of the present invention includes an N-pole circuit and at least one phase-pole circuit, the N-pole circuit is electrically connected to the neutral line of the power supply, the phase-pole circuit is electrically connected to the phase line of the power supply, and both the N-pole circuit and the phase-pole circuit are electrically connected. There is a contact system, or the contact system is only set in the phase-pole circuit and the N-pole circuit is a through-pole circuit (that is, no breakpoint is set in the N-pole circuit). The moving contacts of each contact system are connected to the operating mechanism. drive connected.

As shown in Figures 1-4, the circuit breaker of the present invention also includes a leakage test circuit, which includes a test button and a switch elastic member 2 connected in series between the phase-pole circuit and the N-pole circuit of the circuit breaker in sequence, and a matching conductive structure and the middle conductive structure 7, the switch elastic member 2 includes a switch arm 21 and a connecting arm 22, the switch arm 21 is drivingly cooperated with the test button 1, the connecting arm 22 is fixedly arranged, the matching conductive structure includes a matching elastic member 3, and the matching elastic member 3 includes a matching elastic member 3. The arm 31 and the fixed arm 32, the cooperating arm 31 drives and cooperates with the operating mechanism of the circuit breaker, and the fixed arm 32 is fixedly arranged; when the circuit breaker is in the open state, the cooperating arm 31 is disconnected from the intermediate conductive structure 7; the circuit breaker When switching from the open state to the closed state, the operating mechanism drives the matching arm 31 to be in contact with the intermediate conductive structure 7; the switch arm 21 and the matching conductive structure are kept disconnected, and the test button 1 is pressed to drive the switch arm 21. Contact and conduct with the matching conductive structure to make the test circuit of the circuit breaker conduct, and monitor whether the circuit breaker trips due to leakage.

It should be pointed out that when the circuit breaker is a two-phase circuit breaker, its phase-pole circuit is the L-pole circuit, so the switch elastic member 2, the matching conductive structure and the intermediate conductive structure 7 of the leakage test circuit are sequentially connected in series at the L-pole circuit. between the pole circuit and the N pole circuit. When the circuit breaker is a three-phase circuit breaker, a four-phase circuit breaker or a multi-phase circuit breaker, the switch elastic member 2, the matching conductive structure and the intermediate conductive structure 7 of the leakage test circuit are sequentially connected in series to the N-pole circuit and any one of the circuit breakers. between the phase-to-phase circuits.

The leakage test circuit is simple in structure and reliable in operation. There is a breakpoint between the switch arm 21 of the switch elastic member and the matching conductive structure, and between the matching arm 31 of the matching elastic member 3 and the middle conductive structure 7, respectively. Only after the circuit breaker is closed, that is, after the matching arm 31 is in contact with the intermediate conductive structure 7, and the test button 1 is pressed to drive the switch arm 21 to be in contact with the matching conductive structure, the leakage test circuit can be effectively conducted. Therefore, it is avoided that the leakage test circuit is turned on due to the misoperation of the operator in the open state of the circuit breaker, and the safety is improved.

Specifically, as shown in FIGS. 1 and 3 , the connecting arm 22 of the switch elastic member 2 and the fixing arm 32 of the matching elastic member 3 are respectively matched with the housing h0 to realize their fixed arrangement.

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

As shown in Figures 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 it drive the switch arm 21 and the matching torsion spring The shaft 9 is in contact conduction. Further, the matching torsion spring shaft 9 is arranged on the housing h0.

As shown in FIGS. 2 and 4-6 , the switch arm 21 includes a first segment 21-0 of the switch arm, a second segment 21-1 of the switch arm, and a third segment 21-2 of the switch arm, which are connected in sequence. The two ends of the segment 21-2 are respectively connected with the switch torsion coil 20 of the switch torsion spring and the second segment 21-1 of the switch torsion spring. The second segment 21-1 of the switch arm is driven and matched with the test button 1, and the first segment 21 of the switch arm -0 mates with the mating torsion spring shaft 9 and crosses spatially. Further, the second section 21-1 of the switch arm is parallel to the axial direction of the switch torsion spring 2; the first section 21-0 of the switch is spatially orthogonal to the matching torsion spring shaft 9, and the first section 21 of the switch arm -0 is spatially orthogonal to the third segment 21-2 of the switch arm.

As another embodiment, when the circuit breaker is in the closed state, the switch arm 21 of the switch elastic member 2 may also be in direct contact with the matching elastic member 3 for conduction.

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

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

As shown in Figures 1 and 3, the operating mechanism includes a handle 1a and a first link 2a. The operator toggles the handle 1a to drive the circuit breaker to close or open through the operating mechanism. The handle 1a is rotated to set the first link. One end of 2a is rotatably connected to the handle 1a, and the other end is driven and matched with the matching arm 31 of the matching elastic member 3. When the circuit breaker is switched from the open state to the closed state, the driving and matching arm 31 is in contact and electrically connected with the intermediate conductive structure 7. Further, the operating mechanism also includes a second link, a jumper, a lock and a lever 6a, the lever 6a, the jumper and the lock are respectively arranged to rotate, and one end of the first link 2a is rotatably connected to the handle 1a. , the other end is rotatably connected with one end of the second connecting rod and is slidably arranged in the waist-shaped hole of the jumping buckle in the middle of the jumping buckle. The driving is connected, and the jumping fastener and the locking element are snap-fitted, and the locking element is driven by an external force to rotate to release the snap-fit with the jumping fastener, so that the operating mechanism is tripped. When the handle is rotated by the first link 2a and the second link driving lever 6a to realize the opening or closing operation, the first link 2a and the second link are hinged and one end inserted into the waist-shaped hole of the jumper is along the jumper. When the waist-shaped hole moves, the tripping assembly composed of the jumper and the lock of this operating mechanism is relatively independent from the transmission assembly composed of the second link, the third link and the lever 14. The jumper and the lock are relatively independent. When the buckle is matched, it does not rotate with it, so that the transmission stability is high. Specifically, the handle 1a, the jumper, the lock and the lever 6a are respectively rotatably arranged on the housing h0, the above-mentioned operating mechanism adopts a cam-five-link mechanism, and the external force driving the rotation of the lock can come from the short-circuit protection mechanism (ie electromagnetic release), overload protection mechanism or shunt release.

As other embodiments, other components of the operating mechanism (such as the lever 6a, the second link, etc.) can also be used to change the position of the components when the circuit breaker is switched between the open state and the closed state to drive the coordination. The arm 31 is brought into contact with the intermediate conductive structure 7 in conduction.

As shown in Figs. 1-4, the matching arm 31 has a zigzag structure, including a first section 31-0 of the matching arm, a second section 31-1 of the matching arm and a third section 31-2 of the matching arm, which are connected in sequence. The two ends of the third arm section 31-2 are respectively connected with the matching torsion spring coil 30 of the matching torsion spring and the second section 31-1 of the matching arm, the first section 31-0 of the matching arm is matched with the middle conductive structure 7, and the second matching arm The segment 31-1 cooperates with the first link 2a. Further, the first link 2a is a U-shaped link, one arm of which is drivingly matched with the second segment 31-1 of the engaging arm and intersects in space.

As shown in Figures 1-4, the circuit breaker of the present invention further includes an electromagnetic release for driving the release of the operating mechanism, and the electromagnetic release includes a magnetic yoke electrically connected to the first static contact 10a of the circuit breaker, The yoke is an intermediate conductive structure 7 . Further, the first static contact 10a and the intermediate conductive structure 7 are integral structures. Further, the first static contact 10a is a static contact of a phase-pole circuit or a static contact of an N-pole circuit.

As shown in FIGS. 1-4 , the intermediate conductive structure 7 includes a yoke base plate 70 , a first yoke arm 71 and a second yoke arm 72 , and the first yoke arm 71 and the second yoke arm 72 are disposed opposite to each other and They are respectively connected to the two ends of the yoke base plate 70 by bending, the first yoke arm 71 is matched with the matching arm 30, the first static contact 10a and the first yoke arm 71 are connected to the same end of the yoke base plate 70 and are respectively connected to the same end of the yoke base plate 70. Both sides of the yoke bottom plate 70 are bent. Further, the extending direction of the first yoke arm 71 and the first segment 31 - 0 of the matching arm 31 of the matching arm 31 intersect in space.

Specifically, as shown in Figures 1 and 3, when the handle 1a is rotated clockwise to drive the circuit breaker to switch from the open state to the closed state through the operating mechanism, the handle 1a drives the first link 2a to move to the left as a whole, The left end of the first link 2a presses against the second segment 31-1 of the engaging arm, so that the engaging arm 31 rotates clockwise, so that the first segment 31-0 of the engaging arm and the first yoke arm 71 of the intermediate conductive structure 7 are in contact and conducting .

As shown in Figures 1-4, the leakage test 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 terminal 8N of the circuit breaker. The transformer winding 10 is connected in series between the intermediate conductive structure 7 and the phase-pole terminal 8L of the circuit breaker; the N-pole terminal 8N and the phase-pole terminal 8L are both incoming or outgoing terminals. Further, as shown in Figures 1 and 3, the circuit breaker of the present invention further includes a bimetal 8a, a first static contact 10a, a first movable contact 11a corresponding to the first static contact 10a, and a bimetal. 8a is connected in series between the intermediate conductive structure 7 and the zero-sequence transformer winding 10 in turn, so that when the circuit breaker is in the open state, three breakpoints are formed in the leakage test circuit, which are between the matching arm 31 and the intermediate conductive structure 7 respectively. , the breakpoint between the switch arm 21 and the mating conductive structure, and the breakpoint between the first stationary contact 10a and the first moving contact 11a. Further, the movable contact 11a is electrically connected to the bimetal 8a through the soft connection 7a, and the bimetal 8a is electrically connected to the zero-sequence transformer winding 10 through the support 9a and is fixed on the housing h0 through the support 9a, The current limiting resistor 5 is electrically connected to N and the connection terminal 8N through the conduction 6 .

Specifically, the circuit breaker of the present invention is a two-phase circuit breaker, and the phase-pole connection terminal 8L is also the L-pole connection terminal of the circuit breaker.

As shown in Figure 1-4, it is a layout of the leakage test circuit: the test button 1, the switch torsion spring, and the matching conductive structure are located on one side of the handle 1a, and the axes of the switch torsion spring and the matching torsion spring are parallel. The test button 1 and the handle 1a are arranged side by side at an interval at one end of the housing h0, and the moving direction of the test button 1 is perpendicular to the axial direction of the switch torsion spring and the matching torsion spring. Further, 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 connection terminal 8N and the phase-pole connection terminal 8L are stacked along the thickness direction of the circuit breaker.

The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be considered that the specific implementation of the present invention is limited to these descriptions. For those of ordinary skill in the technical field of the present invention, without departing from the concept of the present invention, some simple deductions or substitutions can be made, which should be regarded as belonging to the protection scope of the present invention.

Claims (13)

1. A leakage test circuit of a circuit breaker, characterized in that: the leakage test circuit comprises a test button (1) and a switch elastic member (2) connected in series between the phase-pole circuit and the N-pole circuit of the circuit breaker in sequence, In cooperation with the conductive structure and the intermediate conductive structure (7), the switch elastic member (2) includes a switch arm (21) and a connection arm (22), the switch arm (21) is driven and matched with the test button (1), and the connection arm (22) is fixed The arrangement, the matching conductive structure includes a matching elastic piece (3), the matching elastic piece (3) includes a matching arm (31) and a fixing arm (32), the matching arm (31) is driven and matched with the operating mechanism of the circuit breaker, and the fixing arm (32) ) fixed settings; When the circuit breaker is in an open state, the cooperating arm (31) is disconnected from the intermediate conductive structure (7); when the circuit breaker is switched from the open state to the closed state, the operating mechanism drives the cooperating arm (31) and the intermediate conductive structure (7). The conductive structure (7) contacts and conducts; The switch arm (21) is kept disconnected from the mating conductive structure, and the test button (1) is pressed to make the driving switch arm (21) contact and conduct with the mating conductive structure. 2. The leakage test circuit of a circuit breaker according to claim 1, characterized in that: the cooperating elastic member (3) is a cooperating torsion spring, and its two ends are a cooperating arm (31) and a fixing arm (32); The switch elastic member (2) is a switch torsion spring, the two ends of which are a switch arm (21) and a connecting arm (22); the cooperating conductive structure further includes a cooperating torsion spring shaft (9), and the cooperating torsion spring is sleeved on the cooperating torsion spring. on the torsion spring shaft (9); press the test button (1) to make the drive switch arm (21) contact and conduct with the matching torsion spring shaft (9). 3. The leakage test circuit of the circuit breaker according to claim 2, wherein the switch arm (21) comprises a first segment (21-0) of the switch arm and a second segment (21-0) of the switch arm which are connected in sequence. 1) and the third section of the switch arm (21-2), the two ends of the third section of the switch arm (21-2) are respectively connected to the switch torsion coil (20) of the switch torsion spring and the second section of the switch arm (21-1) Connected, the second segment (21-1) of the switch arm is driven and matched with the test button (1), and the first segment (21-0) of the switch arm is matched with the mating torsion spring shaft (9) and intersects in space. 4 . The leakage test circuit of the circuit breaker according to claim 1 , wherein the circuit breaker further comprises an electromagnetic release for driving the operating mechanism to trip, and the electromagnetic release includes a first connection with the circuit breaker. 5 . A magnetic yoke to which the static contacts (10a) are electrically connected, and the magnetic yoke is an intermediate conductive structure (7). 5 . The leakage test circuit of the circuit breaker according to claim 4 , wherein the first static contact ( 10 a ) and the intermediate conductive structure ( 7 ) are integral structures. 6 . 6. The leakage test circuit of a circuit breaker according to claim 5, wherein the intermediate conductive structure (7) comprises a yoke base plate (70), a first yoke arm (71) and a second yoke arm (72), the first magnetic yoke arm (71) and the second magnetic yoke arm (72) are arranged opposite to each other and are respectively connected to both ends of the magnetic yoke base plate (70) by bending, and the first magnetic yoke arm (71) is connected to the matching arm (31) Matching, the first static contact (10a) and the first yoke arm (71) are connected to the same end of the yoke base plate (70) and are respectively bent to both sides of the yoke base plate (70). 7. The leakage test circuit of a circuit breaker according to claim 1, wherein the operating mechanism comprises a handle (1a) and a first connecting rod (2a), the handle (1a) is rotated and the first connecting rod ( 2a) One end is rotatably connected to the handle (1a), and the other end is driven to cooperate with the matching arm (31), and when the circuit breaker is switched from the open state to the closed state, the drive matching arm (31) is in contact with the intermediate conductive structure (7) electrical connection. 8. The leakage test circuit of the circuit breaker according to claim 7, wherein the operating mechanism further comprises a second connecting rod, a jumper, a lock and a lever (6a), the lever (6a), the jumper The buckle and the lock are respectively arranged in rotation, one end of the first link (2a) is rotatably connected with the handle (1a), and the other end is rotatably connected with one end of the second link and is slidably arranged in the middle of the jumper. In the hole, the other end of the second connecting rod is drivingly connected with the lever (6a), the lever (6a) is drivingly connected with the moving contact (11a) of the circuit breaker, the jumper and the lock are snap-fitted, and the lock is subjected to external force Drive and rotate to release the snap fit with the jump fastener. 9 . The leakage test circuit of the circuit breaker according to claim 7 , wherein the matching arm ( 31 ) has a zigzag structure, comprising a first section ( 31 - 0 ) of the matching arm, a first section ( 31 - 0 ) of the matching arm, The second section (31-1) and the third section of the matching arm (31-2), the matching elastic member (3) is a matching torsion spring, and both ends of the third section (31-2) of the matching arm are respectively connected with the matching torsion of the matching torsion spring. The spring coil (30) is connected with the second section (31-1) of the matching arm, the first section (31-0) of the matching arm is matched with the middle conductive structure (7), and the second section (31-1) of the matching arm is connected with the first section (31-1) of the matching arm. The connecting rod (2a) fits together. 10. The leakage test circuit of a circuit breaker according to claim 7, wherein the test button (1), the switch elastic member (2), and the matching conductive structure are located on one side of the handle (1a), and the switch elastic member is located on one side of the handle (1a). (2) is a switch torsion spring, and the matching elastic member (3) is a matching torsion spring. The axes of the switch torsion spring and the matching torsion spring are arranged in parallel and spaced apart. At one end of the body (h0), the moving direction of the test button (1) is perpendicular to the axial direction of the switch torsion spring and the matching torsion spring. 11. The leakage test circuit of a circuit breaker according to claim 1, wherein the leakage test circuit further comprises a current limiting resistor (5) and a zero sequence transformer winding (10), and the current limiting resistor (5) is connected in series Between the connecting arm (22) and the N-pole terminal (8N) of the circuit breaker, the zero-sequence transformer winding (10) is connected in series between the intermediate conductive structure (7) and the phase-pole terminal (8L) of the circuit breaker, The N-pole terminal (8N) and the phase-pole terminal (8L) are both incoming or outgoing terminals. 12. The leakage test circuit of the circuit breaker according to claim 11, characterized in that: the first static contact (10a) of the circuit breaker, the first moving contact corresponding to the first static contact (10a) The head (11a) and the bimetal (8a) are connected in series between the intermediate conductive structure (7) and the zero-sequence transformer winding (10). 13. A circuit breaker, characterized in that it comprises the leakage test circuit according to any one of claims 1-12.

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