CN217061822U

CN217061822U - Test button loop device and circuit breaker

Info

Publication number: CN217061822U
Application number: CN202220175992.1U
Authority: CN
Inventors: 夏晓敏; 陈晓海; 李�杰; 吴烟强
Original assignee: Zhejiang Chint Electrics Co Ltd
Current assignee: Zhejiang Chint Electrics Co Ltd
Priority date: 2022-01-21
Filing date: 2022-01-21
Publication date: 2022-07-26
Anticipated expiration: 2032-01-21

Abstract

A test button loop device and a circuit breaker with the same comprise an elastic button and a conductive piece which form a test loop, wherein the elastic button comprises a contact part matched with the conductive piece and a button piece for pressing the contact part; when the breaker is opened, the handle mechanism or the operating mechanism or the moving contact of the breaker drives the conductive piece to be far away from the contact part, and at the moment, the button piece is pressed down to drive the contact part to move, so that the contact part cannot be contacted with the conductive piece. The utility model discloses an experimental return circuit only has a breakpoint by contact site and electrically conductive piece formation, nevertheless possesses the protection effect of two breakpoint structures, prevents the electrified problem behind the separating brake that the reverse connection line brought, still possesses simple structure, assembly efficiency height and the high advantage of reliability.

Description

Test button loop device and circuit breaker

Technical Field

The utility model relates to a low-voltage apparatus field, concretely relates to test button return circuit device and circuit breaker.

Background

The residual current operated circuit breakers are all provided with a test button loop device for detecting whether the leakage protection function of the circuit breaker is normal or not. At present, a test button loop device is divided into a single breakpoint and a double breakpoint, when a breaker is in a breaking position, due to the fact that an incoming line end is connected with a power supply, after a test button is pressed down, an induced voltage exists at an outgoing line end, and potential safety hazards of personal electric shock exist; the double-breakpoint structure solves the problem of induced voltage of the wire outlet end by adding a breakpoint linked with the breaker mechanism, but increases the difficulty of the production process and reduces the assembly efficiency.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art's defect, provide a simple structure, high test button return circuit device of reliability and circuit breaker.

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

a test button loop device comprises an elastic button and a conductive piece, wherein the elastic button and the conductive piece form a test loop, the elastic button comprises a contact part matched with the conductive piece and a button piece for pressing the contact part, the conductive piece is linked with a handle mechanism or an operating mechanism or a moving contact of a circuit breaker, when the circuit breaker is switched on, the handle mechanism or the operating mechanism or the moving contact of the circuit breaker drives the conductive piece to be close to the contact part, and at the moment, the button piece is pressed to drive the contact part to move so as to be contacted with the conductive piece to conduct the test loop; when the breaker is opened, the handle mechanism or the operating mechanism or the moving contact of the breaker drives the conductive piece to be far away from the contact part, and at the moment, the button piece is pressed down to drive the contact part to move, so that the contact part cannot be contacted with the conductive piece.

Furthermore, the conductive piece is rotatably assembled in the shell of the circuit breaker, and the first end of the conductive piece is linked with a handle mechanism, an operating mechanism or a moving contact of the circuit breaker, so that the second end of the conductive piece is close to the contact part during closing and is far away from the contact part during opening.

Furthermore, a limit groove is arranged in the shell, and the second end of the conductive piece swings in the limit groove.

Furthermore, a limit boss is arranged in the shell and positioned above the second end of the conductive piece, and the contact part is in sliding fit with the limit boss.

Furthermore, the inside wall of shell is equipped with first spacing portion, and the elastic button is equipped with the spacing portion of second, by the cooperation of first spacing portion and the spacing portion of second in order to limit the stroke of pressing of elastic button.

The circuit breaker further comprises a test resistor, the conductive piece is electrically connected with one terminal of the circuit breaker through the test resistor, and the contact part is electrically connected with the other terminal of the circuit breaker.

Further, electrically conductive piece includes the torsional spring, the main part of torsional spring rotates to assemble in the shell, and the one end of test resistance is connected with the main part of torsional spring, the both ends of main part extend the first end that forms electrically conductive piece and the second end that electrically conductive piece to the direction of main part both sides respectively, the terminal bending type of first end that electrically conductive piece becomes annular structure, and the terminal bending type of second end that electrically conductive piece is towards shell one side.

Further, the elastic button comprises a conductive spring pressed by the button piece, one end of the conductive spring is electrically connected with a wiring end of the circuit breaker through a wire, the other end of the conductive spring extends to one side to form a contact part, and the contact part is positioned above the conductive piece.

Further, the button spare includes integrated into one piece's operating portion, connecting portion and presses the splenium, operating portion and the button hole sliding fit of shell stretch out the shell, and connecting portion and pressing the splenium are connected the one end that the operating portion is located the shell, and connecting portion extend and are connected in order to press conductive spring with conductive spring's one end along the direction that is on a parallel with the central axis of button hole, press the splenium to extend along the direction of the central axis of perpendicular to button hole, press splenium and the spacing cooperation of contact site to be used for pressing down the contact site, be equipped with as the boss of the spacing portion of second in the middle part protrusion that presses the splenium.

Furthermore, operating device includes the lever and the jump knot, the hasp of rotational assembly in the lever, jump knot and hasp cooperation be provided with the protruding axle on the hasp, by the first end linkage of protruding axle and electrically conductive piece.

The utility model provides a circuit breaker, includes shell and two at least circuit breaker utmost point still be provided with in the shell as above test button circuit arrangement, the one end in test return circuit is connected with the inlet wire end of a circuit breaker utmost point, the other end in test return circuit is connected with the leading-out terminal of another circuit breaker utmost point.

Preferably, the test button loop device and the handle mechanism of the circuit breaker are arranged on the upper portion of the shell, the conductive piece is rotatably assembled between the handle mechanism and the elastic button, and the test resistor is arranged on one side, far away from the elastic button, of the conductive piece.

The utility model discloses a test button return circuit device, test circuit only has a breakpoint by contact site and electrically conductive piece formation, make electrically conductive piece linkage along with the divide-shut brake of circuit breaker, when closing a floodgate, press down the elastic button and can put through test circuit, when separating brake, press down the unable conduction test return circuit of elastic button, make its protection effect that possesses two breakpoint structures, can prevent the electrified problem behind the separating brake that the reverse connection line brought, simple structure that has single breakpoint structure again, assembly efficiency is high and the advantage of high reliability.

In addition, the conductive piece is rotatably installed, the second end of the conductive piece swings along with the opening and closing action of the circuit breaker, and the contact part is in matched contact with the second end of the conductive piece when the circuit breaker is closed and cannot be contacted when the circuit breaker is opened by adjusting the distance between the second end of the conductive piece and the contact part, so that the structure of the circuit breaker is further simplified, and the reliability is improved.

In addition, set up the spacing groove at the shell, by the second end movement track of spacing groove restriction electrically conductive, improve the cooperation degree of contact portion and electrically conductive.

In addition, the pressing stroke of the elastic button is limited by the matching of the first limiting part and the second limiting part, so that the inconvenience in operation caused by overlong pressing stroke of the elastic button is avoided, and meanwhile, the elastic button cannot be contacted with the second end of the conductive piece in a brake-separating state.

The utility model discloses a circuit breaker adopts simple structure, high test button return circuit device of security, has simplified the assembly degree of difficulty of circuit breaker, does benefit to the volume that reduces the circuit breaker.

Drawings

Fig. 1 is a schematic structural diagram of a circuit breaker according to the present invention;

fig. 2 is a schematic structural diagram of the test button circuit device during opening operation of the present invention;

fig. 3 is a schematic structural diagram of the test button circuit device during closing of the utility model;

fig. 4 is a schematic diagram of a circuit breaker pole according to the present invention;

fig. 5 is a schematic structural diagram of the middle conductive member of the present invention.

Detailed Description

The following further describes a specific embodiment of the test button circuit device and the circuit breaker according to the present invention with reference to the embodiments shown in fig. 1 to 5. The utility model discloses a test button return circuit device and circuit breaker is not limited to the description of following embodiment.

A test button loop device comprises an elastic button and a conductive piece 4 forming a test loop, wherein the elastic button comprises a contact part 511 matched with the conductive piece 4 and a button piece 52 pressing the contact part 511, the conductive piece 4 is linked with a handle mechanism 12 or an operating mechanism 13 or a moving contact 141 of a circuit breaker, when the circuit breaker is switched on, the handle mechanism 12 or the operating mechanism 13 or the moving contact 141 of the circuit breaker drives the conductive piece 4 to be close to the contact part 511, and at the moment, the button piece 52 is pressed down to drive the contact part 511 to move so as to be contacted with the conductive piece 4 to conduct the test loop; when the breaker is opened, the handle mechanism 12 or the operating mechanism 13 or the movable contact 141 of the breaker drives the conductive member 4 to move away from the contact portion 511, and at this time, the button member 52 is pressed to drive the contact portion 511 to move, so that the contact portion 4 cannot be contacted.

The utility model discloses a test button return circuit device, test circuit only has a breakpoint by contact site 511 and electrically conductive 4 formation, make electrically conductive 4 linkages along with the divide-shut brake of circuit breaker, when closing a floodgate, press down the elastic button and can put through test circuit, when separating brake, press down the elastic button and can't switch on test circuit, make its protection effect that possesses two breakpoint structures, can prevent the electrified problem behind the separating brake that the reverse connection line brought, simple structure who has single breakpoint structure again, assembly efficiency is high and the reliability is high.

An embodiment of a circuit breaker is provided with reference to fig. 1-5, the circuit breaker includes a housing, at least two circuit breaker poles 1 are arranged in parallel in the housing, each circuit breaker pole 1 includes a connection terminal 11 disposed at two ends, two connection terminals 11 form a connection terminal of the circuit breaker, specifically, one connection terminal 11 is used as a wire inlet end, the other connection terminal 11 is used as a wire outlet end, and the wire inlet ends (wire outlet ends) of two adjacent circuit breaker poles 1 are located at the same side. In addition, each circuit breaker pole 1 can be provided with a phase pole shell independently, and all the phase pole shells are assembled to form a shell of the circuit breaker, or two adjacent circuit breaker poles 1 are separated by a partition plate 2, and a base, an upper cover and at least one partition plate 2 jointly form the shell of the circuit breaker.

At least one of the circuit breaker poles 1 is further provided with a handle mechanism 12, an operating mechanism 13, a contact mechanism, an arc extinguishing system 15, a short-circuit protection mechanism 16 and an overload protection mechanism 17, as shown in fig. 4, the handle mechanism 12 is linked with the operating mechanism 13 and is arranged on the upper portion of the circuit breaker pole 1, the contact mechanism comprises a moving contact 141 and a fixed contact 142 which are matched with each other, the moving contact 141 is connected to the lower portion of the operating mechanism 13, the fixed contact 142 and the arc extinguishing system 15 are fixed on the middle portion of the circuit breaker pole 1, the moving contact 141 and the fixed contact 142 are respectively connected with two wiring terminals 11, the short-circuit protection mechanism 16 is arranged between the handle mechanism 12 and the arc extinguishing system 15, the overload protection mechanism 17 is arranged between one wiring terminal 11 and the moving contact 141, one end of the short-circuit protection mechanism 16 and the movable end of the overload protection mechanism 17 are respectively opposite to the operating mechanism 13, the operating mechanism 13 is triggered to trip when a short circuit or overload fault occurs.

Specifically, the operating mechanism 13 includes a lever rotatably assembled, a jumper, a latch 131 and a contact support are rotatably assembled on the lever, a connecting rod is connected between the jumper and the handle mechanism 12, the jumper is in snap-fit with one end of the latch 131, one end of the short-circuit protection mechanism 16 is opposite to the other end of the latch 131, the other end of the latch 131 is further connected with a trip hook, the trip hook is opposite to the movable end of the overload protection mechanism 17, the movable contact 141 is connected to the lever through the contact support, in this embodiment, the latch 131 is rotatably connected to the lever through a convex shaft 132, one end of the convex shaft 132 protrudes and can penetrate through a clearance hole formed in the partition plate 2 or the phase pole housing to extend into the adjacent breaker pole 1, so that the latches 131 of the adjacent two breaker poles 1 are linked by the convex shaft 132.

As shown in fig. 1-3 and 5, a test button loop device is further disposed in one circuit breaker pole 1 of the present embodiment, the test button loop device is disposed in close contact with a partition 2 of the circuit breaker pole 1, the test button loop device includes an elastic button forming a test loop, a test resistor 3 and a conductive member 4, one end of the test loop is connected to an incoming line end of one circuit breaker pole 1, the other end is connected to an outgoing line end of the other circuit breaker pole 1, a button hole for slidably assembling the elastic button is disposed on an upper portion of the partition 2 of the circuit breaker pole 1, preferably, the button hole is disposed in parallel with a handle mechanism 12 of the circuit breaker pole 1 on an upper portion of the partition 2, the conductive member 4 is rotatably assembled between the handle mechanism 12 and the elastic button, the test resistor 3 is disposed on a side of the conductive member 4 away from the elastic button, that is, the test resistor 3 is disposed below the handle mechanism 12, the conductive piece 4 is connected with one terminal of the circuit breaker through the test resistor 3, the first end 41 of the conductive piece 4 is linked with the operating mechanism 13, specifically, the protruding shaft 132 of the latch 131 is linked with the first end 41 of the conductive piece 4, so that the second end 42 of the conductive piece 4 swings with the opening and closing of the circuit breaker, the elastic button comprises a contact part 511 electrically connected with the other terminal of the circuit breaker and a button piece 52 pressing the contact part 511, in this embodiment, one end of the test resistor 3 is welded on an outlet terminal of one circuit breaker pole 1, and the contact part 511 of the elastic button is connected with an inlet terminal of the other circuit breaker pole 1 through a wire. Compare current two breakpoint test button return circuit structures, the test button return circuit device simple structure of this embodiment fully does benefit to the inside space setting, and it is less to occupy the space, does benefit to the miniaturized design of circuit breaker.

As shown in fig. 2 and 3, a limiting groove 21 and a limiting boss 22 are disposed on an inner side wall of the housing (i.e., a side wall of the partition plate 2) between the handle mechanism 12 and the elastic button, wherein the limiting groove 21 is an arc-shaped groove disposed on one side of the handle mechanism 12, and the second end 42 of the conductive member 4 swings in the limiting groove 21 to improve the degree of matching between the conductive member 4 and the elastic button; the limiting boss 22 corresponds to the upper part of the limiting groove 21, so that the contact part 511 slides along the limiting boss 22, and the limiting boss 22 is connected with the upper side edge of the limiting groove 21 in fig. 2 and 3. Of course, omitting the limiting groove 21 and/or the limiting projection 22 is also equally applicable. In addition, a first limiting portion 23 and a second limiting portion 524 which are matched with each other are further arranged between the elastic button and the inner side wall of the shell, when the elastic button is pressed, the pressing stroke of the elastic button is limited by matching the first limiting portion 23 and the second limiting portion 524, the inconvenience of long pressing stroke of the elastic button is avoided, the test loop can be prevented from being conducted in the opening state, and certainly, the test loop can be prevented from being conducted in the opening state by controlling the elastic deformation amount of the elastic button or controlling the distance between the contact portion 511 and the second end 42 of the conductive piece 4.

In connection with fig. 2, 3 and 5, there is provided a structure of a conductive member 4, the conductive member 4 includes a torsion spring, the main body 43 of the torsion spring is rotatably assembled on the partition board 2, preferably, a connecting shaft or a connecting groove for rotatably connecting the main body 43 is provided on the partition board 2, one end of the test resistor 3 is connected with the main body 43 of the torsion spring, two ends of the main body 43 respectively extend towards two sides of the main body 43 to form a first end 41 of the conductive member 4 and a second end 42 of the conductive member 4, in fig. 2 and 3, the first end 41 of the conductive element 4 extends toward the elastic button, the terminal of the first end 41 of the conductive element 4 bends to form an annular structure, the protruding shaft 132 of the latch 131 extends into the annular structure to drive the conductive element 4 to rotate, the second end 42 of the conductive element 4 extends toward the handle mechanism 12, the terminal of the second end 42 of the conductive element 4 bends toward one side of the housing, and preferably, the terminal of the second end 42 of the conductive element 4 extends into the limiting groove 21 to be in sliding fit with the limiting groove 21.

As shown in fig. 2 and 3, the elastic button includes a conductive spring 51 pressed by a button member 52, one end of the conductive spring 51 is connected to a terminal 11 as a line inlet end through a wire, and the other end of the conductive spring 51 extends to one side to form a contact portion 511, wherein the contact portion 511 extends in the direction of the handle mechanism 12 and corresponds to the upper side of the second end 42 of the conductive member 4.

The button 52 includes an operation portion 521, a connection portion 522 and a pressing portion 523, which are integrally formed, the operation portion 521 is slidably engaged with a button hole of the housing and extends out of the housing, the connection portion 522 and the pressing portion 523 are connected to one end of the operation portion 521 located in the housing, the connection portion 522 extends in a direction parallel to a central axis of the button hole and is connected to one end of the conductive spring 51 to press the conductive spring 51, the pressing portion 523 extends in a direction perpendicular to the central axis of the button hole, the pressing portion 523 is in limit engagement with the contact portion 511 to press the contact portion 511, preferably, the pressing portion 523 is provided with a groove structure engaged with the contact portion 511, and a boss as a second limit portion 524 is convexly provided in a middle of the pressing portion 523.

When the circuit breaker is switched on, as shown in fig. 3, the handle mechanism 12 and the operating mechanism 13 rotate clockwise, the protruding shaft 132 of the latch 131 drives the first end 41 of the conductive piece 4 to rotate downward, the second end 42 of the conductive piece 4 swings upward along the limiting groove 21, the distance between the conductive piece 4 and the contact portion 511 is minimum at this time, the elastic button is pressed at this time, the conductive spring 51 is compressed, and the pressing portion 523 presses the contact portion 511 downward, so that the contact portion 511 contacts with the second end 42 of the conductive piece 4 to conduct the test loop; during opening, as shown in fig. 2, the handle mechanism 12 and the operating mechanism 13 rotate counterclockwise, the protruding shaft 132 of the latch 131 drives the first end 41 of the conductive device 4 to rotate upward, the second end 42 of the conductive device 4 swings downward along the limiting groove 21, the second end 42 of the conductive device 4 is far away from the contact portion 511, and at this time, the button 52 is pressed down, even if the contact portion 511 is pressed downward, because the distance between the contact portion 511 and the second end 42 of the conductive device 4 is far, and the first limiting portion 23 and the second limiting portion 524 limit the stroke of the elastic button, the contact portion 511 cannot contact with the second end 42 of the conductive device 4, so that the test loop is not conducted.

Of course, in this embodiment, other break points may be set in the test loop.

In another embodiment of the present application, the circuit breaker is the same as the above embodiment, the circuit breaker includes a housing and at least two circuit breaker poles 1, one of the circuit breaker poles is provided with a test button circuit device similar to the above embodiment, and different from the above embodiment, the first end 41 of the conductive member 4 is linked with the movable contact 141 of the circuit breaker, so that the second end 42 of the conductive member 4 swings along with the opening and closing actions of the movable contact 141, thereby adjusting the distance between the second end 42 of the conductive member 4 and the contact portion 511.

In a further embodiment of the present application, the circuit breaker is the same as the above-mentioned embodiment, the circuit breaker comprises a housing and at least two circuit breaker poles 1, a test button circuit device the same as the above-mentioned embodiment is arranged on one of the circuit breaker poles 1, and different from the above-mentioned embodiment, the first end 41 of the conductive member 4 is linked with the handle mechanism 12 of the circuit breaker, so that the second end 42 of the conductive member 4 swings with the switching and closing of the handle mechanism 12, thereby adjusting the distance between the second end 42 of the conductive member 4 and the contact portion 511, preferably, in the present embodiment, the first end 41 of the conductive member 4 is arranged on the side close to the handle mechanism 12, the second end 42 of the conductive member 4 is arranged on the side close to the elastic button, and the length of the contact portion 511 can be appropriately shortened.

Of course, in the above three embodiments, the conductive member 4 may also adopt other shapes, such as a conductive rod, or other shapes of elastic members, such as a leaf spring, etc., and the convex shaft 132 of the latch 131, the movable contact 141, the handle mechanism 12, or other actuating mechanisms of the circuit breaker may be directly linked or indirectly linked with the conductive member 4.

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

1. A test button circuit device comprising an elastic button and a conductive member (4) forming a test circuit, the elastic button including a contact portion (511) cooperating with the conductive member (4) and a button member (52) pressing the contact portion (511), characterized in that: the conductive piece (4) is linked with a handle mechanism (12) or an operating mechanism (13) or a moving contact (141) of the circuit breaker, when the circuit breaker is switched on, the handle mechanism (12) or the operating mechanism (13) or the moving contact (141) of the circuit breaker drives the conductive piece (4) to be close to the contact part (511), and at the moment, the button piece (52) is pressed down to drive the contact part (511) to move so as to be contacted with the conductive piece (4); when the breaker is opened, the handle mechanism (12) or the operating mechanism (13) or the moving contact (141) of the breaker drives the conductive piece (4) to be far away from the contact part (511), and at the moment, the button piece (52) is pressed down to drive the contact part (511) to move and cannot be contacted with the conductive piece (4).

2. A test button circuit apparatus according to claim 1, wherein: the conductive piece (4) is rotatably assembled in the shell of the breaker, and the first end (41) of the conductive piece (4) is linked with the handle mechanism (12) or the operating mechanism (13) or the moving contact (141) of the breaker, so that the second end (42) of the conductive piece (4) is close to the contact part (511) during closing and is far away from the contact part (511) during opening.

3. A test button circuit apparatus according to claim 2, wherein: a limiting groove (21) is formed in the shell, and the second end (42) of the conductive piece (4) swings in the limiting groove (21).

4. A test button circuit device according to claim 2, wherein: a limiting boss (22) is arranged in the shell, the limiting boss (22) is located above the second end (42) of the conductive piece (4), and the contact part (511) is in sliding fit with the limiting boss (22).

5. A test button circuit device according to claim 2, wherein: the inside wall of shell is equipped with first spacing portion (23), and the elastic button is equipped with spacing portion of second (524), by first spacing portion (23) with spacing portion of second (524) cooperation in order to limit the stroke of pressing of elastic button.

6. A test button circuit apparatus according to claim 2, wherein: the testing device further comprises a testing resistor (3), the conductive piece (4) is electrically connected with one terminal of the circuit breaker through the testing resistor (3), and the contact part (511) is electrically connected with the other terminal of the circuit breaker.

7. The test button circuit device according to claim 6, wherein: electrically conductive piece (4) include the torsional spring, main part (43) of torsional spring rotate to assemble in the shell, and the one end of experimental resistance (3) is connected with main part (43) of torsional spring, the both ends of main part (43) extend first end (41) that form electrically conductive piece (4) and second end (42) of electrically conductive piece (4) to the direction of main part (43) both sides respectively, the terminal crooked cyclic annular structure that forms in first end (41) of electrically conductive piece (4), the terminal bending orientation shell one side of second end (42) of electrically conductive piece (4).

8. A test button circuit apparatus according to claim 2, wherein: the elastic button comprises a conductive spring (51) pressed by a button piece (52), one end of the conductive spring (51) is electrically connected with a terminal of the circuit breaker through a lead, the other end of the conductive spring (51) extends to one side to form a contact part (511), and the contact part (511) is positioned above the conductive piece (4).

9. A test button circuit apparatus according to claim 8, wherein: the button piece (52) comprises an integrally formed operation part (521), a connecting part (522) and a pressing part (523), the operation part (521) is in sliding fit with a button hole of the shell and extends out of the shell, the connecting part (522) and the pressing part (523) are connected to one end, located in the shell, of the operation part (521), the connecting part (522) extends in the direction parallel to the central axis of the button hole and is connected with one end of the conductive spring (51) to press the conductive spring (51), the pressing part (523) extends in the direction perpendicular to the central axis of the button hole, the pressing part (523) is in limit fit with the contact part (511) and is used for pressing the contact part (511), and a boss serving as a second limiting part (524) is arranged in the middle of the pressing part (523) in a protruding mode.

10. A test button circuit apparatus according to claim 1, wherein: the operating mechanism (13) comprises a lever, a jump buckle and a lock catch (131) which are rotatably assembled on the lever, the jump buckle is in snap fit with the lock catch (131), a convex shaft (132) is arranged on the lock catch (131), and the convex shaft (132) is linked with the first end (41) of the conductive piece (4).

11. A circuit breaker comprising a housing and at least two breaker poles (1), characterized in that: a test button circuit arrangement according to any one of claims 1 to 10, wherein one end of the test circuit is connected to the inlet end of one circuit breaker pole (1) and the other end of the test circuit is connected to the outlet end of the other circuit breaker pole (1).

12. A circuit breaker as claimed in claim 11, characterized in that: the test button loop device and a handle mechanism (12) of the circuit breaker are arranged on the upper portion of the shell, the conductive piece (4) is rotatably assembled between the handle mechanism (12) and the elastic button, and the test resistor (3) is arranged on one side, far away from the elastic button, of the conductive piece (4).