CN220553397U - Circuit breaker with test loop - Google Patents

Abstract

The application discloses a circuit breaker with a test loop, which comprises a circuit breaking action mechanism, a test circuit mechanism and a conduction actuating mechanism; the circuit breaking action mechanism comprises a first shell, and two matching parts are arranged on the first shell; the test circuit mechanism is positioned outside the first shell and provided with two test terminals which are respectively connected with the two matching parts; the conduction actuating mechanism is accommodated in the first shell, wherein the conduction actuating mechanism is contacted with at most one of the two matching parts or contacted with at most one of the two test terminals in a normal state; in the test state, the conduction actuating mechanism can move relative to the first shell under the actuation of external force and simultaneously contact the two matching parts or the two test terminals to form a conduction test loop. The circuit breaker with the test loop disclosed by the application is lower in arrangement difficulty of the test loop and easier to assemble.

Description

Circuit breaker with test loop

Technical Field

The application relates to the technical field of circuit breakers, in particular to a circuit breaker with a test loop.

Background

The circuit breaker is an important device in a modern electrical system, and can automatically cut off a circuit under abnormal conditions such as leakage, overload and short circuit of the circuit, and protect the safe operation of the circuit, so that the circuit breaker has wide application in places such as industry, business, residential houses and the like.

The circuit breaker is generally configured with a circuit breaking action mechanism for breaking the circuit when the occurrence of the above-described abnormal condition of the circuit is detected, and a test circuit mechanism for forming a test loop to detect whether or not the earth leakage protection function of the circuit breaker is normal. In the related art, a test circuit is generally formed near a breaking action mechanism or a contact assembly of a circuit breaker, and electricity is taken through a moving contact of the contact assembly.

However, the assembly structure involved in the circuit breaking action mechanism and the contact assembly is relatively complex, which greatly increases the difficulty and complexity of the arrangement of the test circuit.

Disclosure of Invention

In view of the above, the present application provides a circuit breaker with a test circuit, which has lower difficulty in arrangement of the test circuit and easier assembly.

The application adopts the following technical scheme:

the embodiment of the application provides a circuit breaker with a test loop, which comprises a circuit breaking action mechanism, a test circuit mechanism and a conduction actuating mechanism;

the circuit breaking action mechanism comprises a first shell, and two matching parts are arranged on the first shell;

the test circuit mechanism is positioned outside the first shell and provided with two test terminals which are respectively connected with the two matching parts;

the conduction actuating mechanism is accommodated in the first shell, wherein the conduction actuating mechanism is in contact with at most one of the two matching parts or in contact with at most one of the two test terminals in a normal state; in a test state, the conduction actuating mechanism can move relative to the first shell under the actuation of external force and simultaneously contact the two matching parts or the two test terminals to form a conduction test loop.

Optionally, the mating portion is a socket, and the test terminal is a pin, where when the socket and the pin are mated in a plugging manner, a free end of the pin extends into the first housing and is located in a movement direction of the conduction actuating mechanism;

or,

the cooperation portion is the electric connection piece, the one end of electric connection piece is located the inside of first casing, and be located switch on actuating mechanism's direction of motion, the other end of electric connection piece is followed the outside of first casing exposes, the test terminal with the other end of electric connection piece is connected.

Optionally, the conduction actuating mechanism includes a button member and a conductive member;

the button piece is movably arranged on the first shell, and the pressing end of the button piece is exposed out of the first shell so as to receive actuation of the external force;

the conductive piece is positioned in the first shell and positioned in the moving direction of the button piece, and at least one part of the conductive piece can move to the direction close to the matching parts under the driving of the button piece so as to contact and conduct the two matching parts or the two test terminals.

Optionally, the conductive member has elasticity, wherein in the test state, the conductive member is elastically deformed;

or,

the conductive actuation mechanism further includes a return member configured to urge the button member and the conductive member to return to a position prior to actuation by the external force upon release of the external force.

Optionally, a mounting column is arranged on the inner wall of the first shell, the conductive piece is a torsion spring, and the torsion spring is sleeved on the mounting column;

the first spring arm of the torsion spring is abutted with one of the matching parts or one of the test terminals;

the second spring arm of the torsion spring is abutted with the button piece and is far away from the other matching part or the other test terminal;

wherein the other of the mating portion or the other of the test terminals is located on a rotational path of the second spring arm.

Optionally, the button piece includes a main body portion and a limiting portion, and the pressing end is located on the main body portion;

the limiting part is connected to the main body part and is far away from the pressing end, and the limiting part is used for preventing the second spring arm of the torsion spring from slipping from the position where the second spring arm is abutted to the button piece.

Optionally, the limiting part comprises a first stop block and a second stop block, and the first stop block and the second stop block are arranged at intervals;

and a limiting gap is formed between the first stop block and the second stop block, and a part of the second spring arm of the torsion spring is positioned in the limiting gap and is abutted with the main body part.

Optionally, the first housing has a blocking portion;

and in the normal state, the free end of the second spring arm of the torsion spring is abutted with the blocking part.

Optionally, the first housing has a first sliding portion, and the button member has a second sliding portion;

the first sliding portion is slidably engaged with the second sliding portion, and a sliding direction is parallel to a pressed direction of the button member.

Optionally, the first sliding part comprises a first sliding groove and a first sliding block, and the first sliding groove and the first sliding block are arranged at intervals;

the second sliding part comprises a second sliding groove and a second sliding block, and the second sliding groove and the second sliding block are arranged at intervals;

the first sliding block can slide in the second sliding groove, and the second sliding block can slide in the first sliding groove.

In the circuit breaker with the test loop provided by the embodiment of the application, the circuit breaking action mechanism is provided with the first shell, and the first shell is provided with two matching parts; the test circuit mechanism is arranged outside the first shell and can be respectively connected with the two matching parts in a matching way through the two test terminals; in a normal state, the on actuating mechanism is at most contacted with one matching part or at most contacted with one test terminal, and the test circuit is disconnected at the moment; in the test state, the conduction actuating mechanism can simultaneously contact the two matching parts or the two test terminals under the actuation of external force, and the test loop is conducted. Because other spare parts in the action mechanism that opens circuit separate with test circuit mechanism through first casing, when the assembly with two test terminals of test circuit mechanism with two cooperation portions on the first casing be connected can, consequently greatly reduced test circuit's the degree of difficulty of arranging for test circuit mechanism's assembly is easier.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of a residual current operated circuit breaker according to an embodiment of the present application;

fig. 2 is an external view schematically showing a leakage module of the residual current operated circuit breaker shown in fig. 1;

fig. 3 is a schematic view of the internal structure of the leakage module (the second housing is omitted) shown in fig. 2;

fig. 4 is an exploded view of a leakage module according to an embodiment of the present disclosure;

fig. 5 is a schematic structural diagram of a leakage module (omitting a wiring mechanism and a test circuit mechanism) according to an embodiment of the present application;

FIG. 6 is a schematic diagram of a test circuit mechanism according to an embodiment of the present disclosure;

fig. 7 is a schematic diagram of connection between a pin and a wire according to an embodiment of the present application;

fig. 8 is a schematic structural diagram of the leakage module provided in the embodiment of the present application in a state of opening a gate;

FIG. 9 is a schematic view of a partial structure of a first housing according to an embodiment of the present application;

fig. 10 is a schematic structural diagram of the leakage module provided in the embodiment of the present application under a closing state and a normal state;

fig. 11 is a schematic structural diagram of the leakage module provided in the embodiment of the present application in a closing and testing state (the latch mechanism is not tripped);

fig. 12 is a schematic structural diagram of the leakage module provided in the embodiment of the present application in a closing and testing state (the latch mechanism is tripped);

fig. 13 is a schematic structural view of a button member according to an embodiment of the present application;

fig. 14 is a schematic view of an assembled structure of a button member and torsion spring according to an embodiment of the present application.

Reference numerals:

100. an air switch module; 200. a leakage module;

1. a circuit breaking action mechanism; 11. a first housing; 111. a mounting column; 12. a mating portion; 121. a socket; 13. a blocking portion; 14. a first sliding portion; 141. a first chute; 142. a first slider;

2. a test circuit mechanism; 21. a test terminal; 211. a contact pin; 22. a wire; 23. testing the circuit board;

3. turning on the actuating mechanism; 31. a button member; 311. a main body portion; 3111. a pressing end; 312. a limit part; 3121. a first stopper; 3122. a second stopper; 3123. spacing gaps; 313. a second sliding part; 3131. a second chute; 3132. a second slider; 32. a conductive member; 321. a first spring arm; 322. a second spring arm; 3221. a free end of the second spring arm;

4. a handle operating mechanism;

5. a wiring mechanism;

6. and a second housing.

Detailed Description

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

In addition, the technical features described below in the different embodiments of the present application may be combined with each other as long as they do not collide with each other.

The embodiment of the application provides a circuit breaker with a test loop, which can be applied to a circuit, so that when the circuit is in conditions of electric leakage, overload, short circuit and the like, the circuit breaker can automatically cut off the circuit, and electric equipment in the circuit is effectively protected. The circuit breaker with the test loop can be a high-voltage circuit breaker and is applied to a high-voltage circuit; and the circuit breaker can also be a low-voltage circuit breaker and is applied to a low-voltage circuit.

In one example, as shown in fig. 1, the circuit breaker provided in the embodiments of the present application may be a residual current operated circuit breaker, and is assembled by at least one air switch module 100 and at least one leakage module 200. Each leakage module 200 in the residual current operated circuit breaker has a test loop for simulating the occurrence of a leakage condition of the circuit to detect the validity and reliability of the leakage protection function of the residual current operated circuit breaker.

Fig. 2 is an external view schematically showing a leakage module 200 of the residual current operated circuit breaker shown in fig. 1, and fig. 3 is an internal structure schematically showing the residual current operated circuit breaker shown in fig. 1. As shown in fig. 2 and 3, the residual current operated circuit breaker may include a second housing 6, and a handle operating mechanism 4, a breaking operating mechanism 1, a wiring mechanism 5, and a test circuit mechanism 2 mounted on the second housing 6. The test circuit mechanism 2 is used for detecting whether the function of the circuit breaker is normal, namely detecting whether the circuit breaker can timely open a circuit under the conditions of short circuit, overload or electric leakage; the wiring mechanism 5 is connected to the power supply circuit through the contact mechanism in the air switch module 100 and is connected with the test circuit mechanism 2 so as to supply power to the test circuit board 23 in the test circuit mechanism 2; the handle actuating mechanism is connected with the contact assembly in the air switch module 100 and is used for controlling the connection or disconnection of the contact mechanism; the circuit breaking action mechanism 1 is connected with the test circuit mechanism 2 and is connected with the handle operation mechanism 4, and is used for responding to the detection of circuit leakage by the test circuit mechanism 2 to act, and drives the handle operation mechanism 4 to act so as to break the contact mechanism in the air switch module 100, thereby cutting off the circuit.

Of course, in other examples of the present application, the circuit breaker may be another type of circuit breaker, such as a low-voltage circuit breaker, and the embodiment of the present application is not limited thereto.

The following describes and describes in detail the scheme of the embodiment of the present application, taking the circuit breaker as an example of a residual current operated circuit breaker.

The embodiment of the application provides a circuit breaker with a test loop, as shown in fig. 4, the circuit breaker comprises a circuit breaking action mechanism 1, a test circuit mechanism 2 and a conduction actuating mechanism 3; the circuit breaking action mechanism 1 comprises a first shell 11, and two matching parts 12 are arranged on the first shell 11; the test circuit mechanism 2 is located outside the first housing 11, and has two test terminals 21, the two test terminals 21 being connected to the two fitting portions 12, respectively; the conduction actuating mechanism 3 is accommodated in the first housing 11. Wherein normally the on-actuation mechanism 3 is in contact with at most one of the two mating parts 12 or with at most one of the two test terminals 21; in the test state, the conduction actuating mechanism 3 can move relative to the first shell 11 under the actuation of external force and simultaneously contact the two matching parts 12 or the two test terminals 21 to form a conduction test loop.

In summary, in the circuit breaker with a test circuit provided in the embodiment of the present application, since at least a part of the components except the first housing 11 in the circuit breaking action mechanism 1 are accommodated in the first housing 11, and the test circuit mechanism 2 is arranged outside the first housing 11 and separated from at least a part of the components of the circuit breaking action mechanism 1 by the first housing 11, when assembling, only two test terminals 21 of the test circuit mechanism 2 are cooperatively connected with two mating parts 12 on the first housing 11, and then the connection or disconnection of the test circuit can be controlled by the connection actuating mechanism 3, therefore, the arrangement difficulty of the test circuit is greatly reduced, and the assembly and arrangement of each component in the test circuit mechanism 2 are easier.

In some embodiments of the present application, as shown in fig. 4 to 8, the mating portion 12 may be a socket 121, and the test terminal 21 may be a pin 211, wherein when the socket 121 and the pin 211 are in plug-fit, a free end of the pin 211 protrudes into the interior of the first housing 11 and is located in a movement direction of the conductive actuating mechanism 3.

Referring to fig. 5, two sockets 121 are penetratingly provided on a side wall of the first housing 11, the two sockets 121 being spaced apart, and each socket 121 communicating the inside and the outside of the first housing 11. Referring to fig. 6, two test terminals 21 of the test breaking mechanism are pins 211, and the two pins 211 can be respectively in plug-in fit with two sockets 121 on the first housing 11. As shown in fig. 7, each pin 211 may be connected to a test pin of a test circuit board 23 of the test breaking mechanism through a wire 22, and perform transmission of an electrical signal. Since the pin 211 has a certain length, when the pin 211 is plugged into the socket 121, the free end of the pin 211 away from the wire 22 will extend into the first housing 11 so as to be matched with the conductive actuating mechanism 3. When the on-actuation mechanism 3 moves into contact with both pins 211, the test circuit is on because the on-actuation mechanism 3 and the pins 211 are both conductive, and thus, the two pins 211 are electrically conductive.

In other embodiments of the present application, the mating portion 12 may be a power receiving element, where one end of the power receiving element is located inside the first housing 11 and located in the moving direction of the conductive actuating mechanism 3, and the other end of the power receiving element is exposed from the outside of the first housing 11, and the test terminal 21 may be connected to the other end of the power receiving element.

Illustratively, two through holes may be provided in a side wall of the first housing 11 at intervals, and one power receiving member may be fixed in each through hole, wherein each power receiving member has a portion located inside the first housing 11 and a portion exposed from the outside of the first housing 11. In the embodiment of the present application, the "the other end of the power receiving element is exposed from the outside of the first housing 11" means that in the case where the human eye is abutting the other end of the power receiving element, at least a part of the power receiving element can be seen, including both the case where the other end of the power receiving element passes out to the outside of the first housing 11 through the through hole and the case where the power receiving element is located inside the first housing 11 or within the through hole.

The positions of the electric connection pieces correspond to the positions of the conduction actuating mechanism 3, and when the conduction actuating mechanism 3 moves to be in contact with both the electric connection pieces, the conduction actuating mechanism 3 and the electric connection pieces have conductivity, so that the electric conduction is realized between the two electric connection pieces, and the test loop is conducted.

In some embodiments of the present application, as shown in fig. 8, the on-actuation mechanism 3 includes a button member 31 and a conductive member 32. Wherein the button member 31 is movably mounted to the first housing 11, and a pressing end 3111 of the button member 31 is exposed from the first housing 11 to receive actuation of an external force; the conductive member 32 is located inside the first housing 11 and located in the moving direction of the button member 31, and at least a portion of the conductive member 32 can be driven by the button member 31 to move in a direction approaching the mating portions 12, so as to contact and conduct the two mating portions 12 or the two test terminals 21.

The button member 31 is made of insulating material, and the pressing end 3111 thereof extends from the first housing 11 to receive pressing; the button member 31 is movable in the pressing direction relative to the first housing 11 by pressing by an external force. The conductive member 32 may be connected to or abutted against the button member 31 so as to move along with the movement of the button member 31, wherein the movement form of the conductive member 32 may be any one of movement or rotation.

In some embodiments of the present application, the button member 31 and the first housing 11 may be slidably connected, and as shown in fig. 9 and 13, the first housing 11 has a first sliding portion 14, and the button member 31 has a second sliding portion 313; the first sliding portion 14 is in sliding engagement with the second sliding portion 313, and the sliding direction is parallel to the pressed direction of the button member 31.

Wherein the first sliding portion 14 may include at least one of a chute and a slider; the second sliding portion 313 may include at least one of a chute and a slider.

Alternatively, with continued reference to fig. 9 and 13, the first sliding portion 14 includes a first sliding groove 141 and a first sliding block 142, and the first sliding groove 141 and the first sliding block 142 are spaced apart; the second sliding portion 313 includes a second sliding chute 3131 and a second slider 3132, and the second sliding chute 3131 and the second slider 3132 are disposed at intervals; the first slider 142 is slidable in the second slide groove 3131, and the second slider 3132 is slidable in the first slide groove 141.

Alternatively, the front projections of the first slider 142 and the second slider 3132 on a setting plane perpendicular to the pressed direction of the button have a space.

Taking the matching portion 12 as a socket 121 and taking the test terminal 21 as a pin 211 as an example, when the pin 211 is plugged into the socket 121, the free end of the pin 211 is located in the movement direction of the conductive element 32; when the button member 31 is pressed by an external force, it slides on the first housing 11 and actuates the conductive member 32 to move, so that the conductive member 32 contacts the free ends of the two pins 211 at the same time, thereby conducting the test circuit.

After the test condition is completed, the button member 31 needs to return to the initial position before being pressed, and the conductive member 32 needs to return to a position away from the free end of the at least one pin 211, so as to facilitate normal access and use of the circuit breaker in the circuit.

Thus, in some embodiments of the present application, the on-actuation mechanism 3 may include a return member configured to urge the button member 31 and the conductive member 32 to return to a position prior to actuation by an external force upon release of the external force.

Optionally, the return member is a compression spring. The compression spring may elastically abut against the button member 31, and the button member 31 is connected with the conductive member 32. In the test state, the conductive member 32 is subjected to an external force and contacts the free ends of the two pins 211 at the same time, at this time, the test circuit is conducted, and the compression spring is in an elastically compressed state; when the external force is released, the compression spring returns to deform and drives the button member 31 to return to the position before being pressed, so that the button member 31 drives the conductive member 32 to be away from the free end of the at least one contact pin 211, and the test circuit is disconnected.

In other embodiments of the present application, the conductive element 32 may have elasticity, wherein the conductive element 32 is elastically deformed in the test state.

In the test state, the conductive member 32 is subjected to an external force and contacts the free ends of the two pins 211 at the same time, and at this time, the test circuit is conducted, and the conductive member 32 is in an elastically deformed state. When the external force is released, the conductive member 32 can automatically return to the position before elastic deformation based on the elasticity of the conductive member, so that the conductive member is far away from the free end of the at least one contact pin 211, and the test circuit is disconnected.

Alternatively, as shown in fig. 9 and 10, the conductive member 32 may be a torsion spring; the inner wall of the first housing 11 is provided with a mounting post 111, and a torsion spring is sleeved on the mounting post 111. Wherein, the first spring arm 321 of the torsion spring is abutted with one matching part 12 or one test terminal 21; the second spring arm 322 of the torsion spring abuts against the button member 31 and is away from the other mating portion 12 or the other test terminal 21; wherein the other mating portion 12 or the other test terminal 21 is located on the rotational path of the second spring arm 322.

The torsion spring is disposed inside the first housing 11, and as shown in fig. 10, 11 and 12, the torsion spring may be sleeved on the mounting post 111, thereby achieving fixation on the inner wall of the first housing 11. Taking the mating portion 12 as the socket 121, the test terminal 21 as the pin 211, when the pin 211 is plugged into the socket 121, the free end of the pin 211 extends into the first housing 11, the first spring arm 321 of the torsion spring can elastically abut against the free end of one pin 211, and the second spring arm 322 of the torsion spring elastically abuts against the button member 31 and is far away from the free end of the other pin 211. When the button member 31 is pressed by an external force capable of overcoming the elastic force of the torsion spring, the second spring arm 322 of the torsion spring is driven to rotate and gradually approach the free end of the other contact pin 211, in this process, the distance between the first spring arm 321 and the second spring arm 322 gradually decreases, and the elastic force provided by the torsion spring gradually increases until the second spring arm 322 contacts the free end of the other contact pin 211. Since the torsion spring always provides resistance to movement of the button member 31 during pressing, a user can have a good feel when pressing the button member 31.

In some embodiments of the present application, as shown in fig. 13, the button member 31 includes a main body portion 311 and a stopper portion 312, and the pressing end 3111 is located on the main body portion 311; the limiting portion 312 is connected to the main body 311 and is away from the pressing end 3111, and the limiting portion 312 is used for preventing the second spring arm 322 of the torsion spring from sliding from a position abutting against the button member 31.

Illustratively, the retainer 312 is attached to the body portion 311 on a side thereof remote from the pressing end 3111. Since the torsion spring is charged in the test state, the stopper portion 312 can be connected to the main body portion 311 at a position farthest from the pressing end 3111 for safety, and in this case, since the main body portion 311 of the button member 31 is located on the side of the second spring arm 322 of the torsion spring away from the fitting portion 12 as a whole, it is also possible to avoid the main body portion 311 from affecting the fitting of the torsion spring and the contact pin 211.

Alternatively, as shown in fig. 13 and 14, the stopper 312 may include a first stopper 3121 and a second stopper 3122, the first stopper 3121 and the second stopper 3122 being disposed at intervals; a limiting gap 3123 is formed between the first stop 3121 and the second stop 3122, and a portion of the second spring arm 322 of the torsion spring is located in the limiting gap 3123 and abuts against the main body 311.

Illustratively, the first and second stoppers 3121 and 3122 are each connected to the side of the body portion 311 remote from the pressing end 3111, such that the limiting gap 3123 formed between the first and second stoppers 3121 and 3122 is open away from the pressing end 3111, and thus the second spring arm 322 located within the limiting gap 3123 may abut against the end of the body portion 311 remote from the pressing end 3111. Further, since the opening direction of the restriction gap 3123 is also opposite to the elastic direction of the second spring arm 322 of the coil spring, the second spring arm 322 is not easily released from the restriction gap 3123.

In some embodiments of the present application, the length of the second spring arm 322 of the coil spring may be greater than the length of the first spring arm 321, thereby ensuring that the second spring arm 322 is able to contact the free end of the other pin 211 after rotation. As shown in fig. 14, the second spring arm 322 may pass through the limiting gap 3123 from one side of the button piece 31 and protrude to the other side of the button piece 31. Accordingly, as shown in fig. 9 and 10, the first housing 11 may have a blocking portion 13; normally, the free end 3221 of the second spring arm 322 of the torsion spring abuts against the blocking portion 13. The blocking part 13 is used for positioning and further limiting the second spring arm 322 of the torsion spring, so that the torsion spring is fixed on the first housing 11 more firmly.

In the description of the present application, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of description of the present application and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated.

The foregoing is merely for facilitating understanding of the technical solutions of the present application by those skilled in the art, and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims (10)

1. A circuit breaker with a test circuit, characterized in that the circuit breaker comprises a breaking action mechanism (1), a test circuit mechanism (2) and a conduction actuating mechanism (3);

the circuit breaking action mechanism (1) comprises a first shell (11), and two matching parts (12) are arranged on the first shell (11);

the test circuit mechanism (2) is positioned outside the first shell (11) and is provided with two test terminals (21), and the two test terminals (21) are respectively connected with the two matching parts (12);

the conduction actuating mechanism (3) is accommodated in the first housing (11), wherein in a normal state, the conduction actuating mechanism (3) is in contact with at most one of the two mating parts (12) or with at most one of the two test terminals (21); in a test state, the conduction actuating mechanism (3) can move relative to the first shell (11) under the actuation of external force and simultaneously contact the two matching parts (12) or the two test terminals (21) to form a conduction test loop.

2. The circuit breaker according to claim 1, characterized in that the mating portion (12) is a socket (121) and the test terminal (21) is a pin (211), wherein when the socket (121) and the pin (211) are in a plug-in mating, a free end of the pin (211) protrudes into the interior of the first housing (11) and is located in the direction of movement of the on-actuation mechanism (3);

or,

the matching part (12) is a power receiving part, one end of the power receiving part is positioned in the first shell (11) and positioned in the moving direction of the conducting actuating mechanism (3), the other end of the power receiving part is exposed out of the first shell (11), and the test terminal (21) is connected with the other end of the power receiving part.

3. Circuit breaker according to claim 1 or 2, characterized in that the on-actuation mechanism (3) comprises a push button member (31) and a conductive member (32);

the button member (31) is movably mounted to the first housing (11), and a pressing end (3111) of the button member (31) is exposed from the first housing (11) to receive actuation of the external force;

the conductive piece (32) is positioned in the first shell (11) and positioned in the moving direction of the button piece (31), and at least one part of the conductive piece (32) can move towards the direction close to the matching parts (12) under the driving of the button piece (31) so as to contact and conduct the two matching parts (12) or the two test terminals (21).

4. A circuit breaker according to claim 3, characterized in that the conductive element (32) has an elasticity, wherein in the test state the conductive element (32) is elastically deformed;

or,

the on-actuation mechanism (3) further comprises a return member configured to urge the button member (31) and the conductive member (32) to return to a position before being actuated by the external force after the external force is released.

5. The circuit breaker according to claim 4, characterized in that the inner wall of the first housing (11) is provided with a mounting post (111), the conductive member (32) is a torsion spring, and the torsion spring is sleeved on the mounting post (111);

the first spring arm (321) of the torsion spring is abutted with one of the matching parts (12) or one of the test terminals (21);

a second spring arm (322) of the torsion spring is abutted with the button piece (31) and is far away from the other matching part (12) or the other test terminal (21);

wherein the other mating part (12) or the other test terminal (21) is located on the rotation path of the second spring arm (322).

6. The circuit breaker according to claim 5, characterized in that the button element (31) comprises a main body portion (311) and a limit portion (312), the pressing end (3111) being located on the main body portion (311);

the limiting part (312) is connected to the main body part (311) and is far away from the pressing end (3111), and the limiting part (312) is used for preventing the second spring arm (322) of the torsion spring from slipping from a position abutting against the button piece (31).

7. The circuit breaker according to claim 6, characterized in that the limit stop (312) comprises a first stop (3121) and a second stop (3122), the first stop (3121) and the second stop (3122) being spaced apart;

a limit gap (3123) is formed between the first stopper (3121) and the second stopper (3122), and a part of the second spring arm (322) of the torsion spring is positioned in the limit gap (3123) and is in contact with the main body part (311).

8. Circuit breaker according to any of claims 5-7, characterized in that the first housing (11) has a blocking portion (13);

in the normal state, the free end (3221) of the second spring arm (322) of the torsion spring is abutted with the blocking part (13).

9. A circuit breaker according to claim 3, characterized in that the first housing (11) has a first sliding portion (14) and the button member (31) has a second sliding portion (313);

the first sliding portion (14) is slidably fitted with the second sliding portion (313), and the sliding direction is parallel to the pressed direction of the button member (31).

10. The circuit breaker according to claim 9, characterized in that the first sliding portion (14) comprises a first sliding chute (141) and a first slider (142), the first sliding chute (141) and the first slider (142) being arranged at intervals;

the second sliding part (313) comprises a second sliding groove (3131) and a second sliding block (3132), and the second sliding groove (3131) and the second sliding block (3132) are arranged at intervals;

the first slider (142) is slidable in the second slide groove (3131), and the second slider (3132) is slidable in the first slide groove (141).