CN114551177A - Earth leakage circuit breaker - Google Patents

Abstract

The application discloses a residual current circuit breaker, which comprises a partition plate, a test loop, a first terminal, a second terminal and a test button, wherein the test loop, the first terminal, the second terminal and the test button are installed on the partition plate; the first terminal and the second terminal are respectively one and the other of a live wire incoming terminal and a zero wire outgoing terminal, or are respectively one and the other of a zero wire incoming terminal and a live wire outgoing terminal; the test loop comprises a first circuit and a second circuit, the first circuit is electrically connected with the first terminal, the second circuit is electrically connected with the second terminal, the first circuit and the second circuit are disconnected in a normal state, and at least one part of the second circuit is actuated by the test button pressed in a leakage test state, so that the first circuit and the second circuit are conducted. In the electric leakage circuit breaker disclosed in the application, the test circuit gets the electricity through the incoming line terminal of one in live wire and the zero line and the terminal that goes out of another, therefore need not to pass the mutual-inductor and can guarantee the normal work of mutual-inductor under the electric leakage test state, has reduced the assembly degree of difficulty of circuit.

Description

Earth leakage circuit breaker

Technical Field

The application relates to the technical field of circuit breakers, in particular to a residual current circuit breaker.

Background

The residual current circuit breaker is used as an important protective electrical appliance in a power supply line and is widely applied to places such as industry, commerce, civil residence and the like. The leakage circuit breaker can act quickly when human body electric shock occurs or the leakage current of the circuit exceeds a setting value, so that the power supply is automatically cut off in a very short time. During the use of the earth leakage breaker, the internal connection circuit and the electronic components may fail, resulting in failure of the earth leakage protection function. Therefore, the inside of the electrical leakage breaker is usually configured with a test loop, and whether the electrical leakage breaker functions normally is detected through the test loop.

In the related art, the inside of the residual current circuit breaker is usually divided into two spaces that are not communicated with each other by a partition plate, wherein a zero line outgoing terminal and a zero line incoming terminal are arranged in one of the spaces, and a live line outgoing terminal and a live line incoming terminal are arranged in the other space. The test circuit of the residual current circuit breaker usually takes electricity through a zero line outlet terminal and a live line outlet terminal. When electricity is taken through the zero line outlet terminal and the live line outlet terminal, the sum of current vectors of two main conducting wires passing through the mutual inductor in the electric leakage test state is 0. In order to ensure that the mutual inductor can trigger the mechanism to act to break the circuit in the leakage test, a test loop needs to pass through the mutual inductor.

However, when the test loop passes through the transformer, a large number of wires pass through the transformer, and thus the assembly line near the transformer is complicated.

Disclosure of Invention

In view of this, this application provides an electric leakage circuit breaker, and this electric leakage circuit breaker's test circuit need not to pass the mutual-inductor, and the circuit assembly is more succinct.

The following technical scheme is specifically adopted in the application:

the embodiment of the application provides an electric leakage circuit breaker, which comprises a partition board, a test loop, a first terminal, a second terminal and a test button;

the test circuit, the first terminal, the second terminal and the test button are all mounted on the partition;

the first terminal and the second terminal are respectively one and the other of a live wire incoming terminal and a zero wire outgoing terminal, or are respectively one and the other of a zero wire incoming terminal and a live wire outgoing terminal;

the test loop comprises a first circuit and a second circuit, the first circuit is electrically connected with the first terminal, the second circuit is electrically connected with the second terminal, the first circuit and the second circuit are disconnected in a normal state, and at least one part of the second circuit is actuated by a test button pressed in a leakage test state, so that the first circuit and the second circuit are conducted.

Optionally, the second circuit includes a test resistor, a first conductive member and a second conductive member electrically connected in sequence;

the testing resistor is arranged on the first side of the partition plate, and one end, far away from the first conductive piece, of the testing resistor is electrically connected with the second terminal;

the second electrically-conductive member is mounted on a second side of the partition opposite the first side, the second electrically-conductive member adapted to move upon actuation of the test button.

Optionally, the second conductive member includes a fixing portion and a conductive arm, the second conductive member is mounted on the partition plate through the fixing portion, and the conductive arm is connected to the fixing portion and can rotate around the fixing portion as a rotation center;

the test button is connected to or against the conductive arm when actuated.

Optionally, the second conductive member is an elastic member, and the test button is located in a rebound direction of the conductive arm of the second conductive member.

Optionally, the bottom of the test button has a groove open to the conductive arm;

a portion of the conductive arm is located in the trench.

Optionally, the second side of the partition plate is provided with a fixing column;

the second conductive piece is a torsion spring, the fixing part comprises a coil of the torsion spring and a first spring arm, the coil is sleeved on the fixing column, and the first spring arm is abutted against or connected with the partition plate; the conductive arm is a second spring arm of the torsion spring.

Optionally, the partition board is provided with a via hole, and the via hole penetrates through the partition board in the thickness direction;

the first conductive piece comprises a first end, a middle part and a second end which are connected in sequence;

a first accommodating groove is formed in the first side of the partition plate, and the through hole is adjacent to the fixing column; the first end of the first conductive piece is electrically connected with the test resistor, the middle part of the first conductive piece is positioned in the first accommodating groove, the second end of the first conductive piece penetrates through the through hole, and the part of the second end, which extends out of the through hole, is in contact with the inner wall of the spring coil.

Optionally, the first end of the first conductive member has elasticity, and the test resistor is located in a rebound direction of the first end and abuts against the first end.

Optionally, the first circuit includes a movable contact and a flexible conductor, and the movable contact is electrically connected to the first terminal through the flexible conductor.

Optionally, the movable contact has a conductive column, and the conductive column extends away from the partition board;

wherein the conductive posts are arranged such that: the second circuit cannot contact the conductive column under the actuation of the pressed test button in the opening state, so that the first circuit and the second circuit cannot be conducted; under the closing state, the second circuit can contact the conductive column under the actuation of the pressed test button, so that the first circuit and the second circuit can be conducted.

Among the residual current circuit breaker that this application embodiment provided, test circuit gets the electricity through live wire incoming line terminal and zero line terminal outgoing line, perhaps gets the electricity through zero line incoming line terminal and live wire terminal outgoing line, and adopts this kind to get the electricity mode, can be so that electric leakage test state under pass two main traverse lines of mutual-inductor current vector with be not 0 to satisfy the work demand of mutual-inductor, the mutual-inductor can in time trigger mechanism action and open circuit when making the test. That is to say, among the electric leakage circuit breaker that this application embodiment provided, the test circuit need not to pass the mutual-inductor, therefore the assembly mode of circuit is more succinct.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an electrical leakage breaker according to an embodiment of the present disclosure;

fig. 2 is a schematic structural diagram of an electrical leakage breaker on a second side of a partition according to an embodiment of the present application;

fig. 3 is a schematic structural diagram of an electrical leakage breaker on a first side of a partition according to an embodiment of the present application;

fig. 4 is a schematic view illustrating a first structure of a second conductive member according to an embodiment of the present application;

fig. 5 is an assembly schematic diagram of a second conductive member according to an embodiment of the present application;

fig. 6 is a schematic view illustrating an assembly of a test button and a second conductive member according to an embodiment of the present application;

fig. 7 is a second structural schematic diagram of a second conductive member according to an embodiment of the present application;

fig. 8 is an assembly schematic view of a first conductive member according to an embodiment of the present application;

fig. 9 is a schematic structural diagram of a fixing column provided in the embodiment of the present application;

fig. 10 is a schematic structural diagram of a first conductive member according to an embodiment of the present application;

FIG. 11 is a schematic structural diagram of the residual current circuit breaker on the second side of the partition in the opening state according to the embodiment of the present application;

fig. 12 is a schematic structural diagram of the residual current circuit breaker on the second side of the partition in the closing state according to the embodiment of the present application.

Reference numerals:

1. a partition plate; 11. a via hole; 12. a first accommodating groove; 13. fixing a column;

2. testing the loop;

21. a first circuit; 211. a moving contact; 2111. a conductive post; 212. a flexible wire;

22. a second circuit;

221. testing the resistance;

222. a first conductive member; 2221. a first end; 2222. a middle portion; 2223. a second end;

223. a second conductive member; 2231. a fixed part; 2232. a conductive arm; 2233. a spring coil; 2234. a first spring arm;

3. a first terminal; 4. a second terminal;

5. a test button; 51. a trench;

6. a base; 7. a cover body;

100. a first space; 200. a second space.

With the above figures, there are shown specific embodiments of the present application, which will be described in more detail below. The drawings and written description are not intended to limit the scope of the inventive concepts in any manner, but rather to illustrate the concepts of the application by those skilled in the art with reference to specific embodiments.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The embodiment of the application provides an electric leakage circuit breaker, as shown in fig. 1, the electric leakage circuit breaker may include a housing, and a handle operating system, a mechanism system, a thermal system, a contact system, an electromagnetic system, an arc extinguishing system, a wiring system, etc. installed on the housing.

The housing may include a base 6, a cover 7, and at least one partition 1, where the at least one partition 1 may divide the interior of the housing into a plurality of spaces. Fig. 1 exemplarily provides a structure of an earth leakage breaker having a partition plate 1, a first space 100 is formed between the partition plate 1 and a base 6, and a second space 200 is formed between the partition plate 1 and a cover 7; in which one of the first space 100 and the second space 200 is installed with a live wire wiring system and the other is installed with a neutral wire wiring system.

In the electrical leakage breaker provided in the embodiment of the present application, as shown in fig. 1, the electrical leakage breaker may further include a test circuit 2, a first terminal 3, a second terminal 4, and a test button 5, where the test circuit 2, the first terminal 3, the second terminal 4, and the test button 5 are all mounted on the partition board 1; the first terminal 3 and the second terminal 4 are respectively one and the other of a live wire incoming terminal and a zero wire outgoing terminal, or are respectively one and the other of a zero wire incoming terminal and a live wire outgoing terminal; the test loop 2 comprises a first circuit 21 and a second circuit 22, the first circuit 21 is electrically connected with the first terminal 3, the second circuit 22 is electrically connected with the second terminal 4, wherein the first circuit 21 is normally disconnected from the second circuit 22, and the test button 5 pressed in the leakage test state actuates at least a part of the second circuit 22, so that the first circuit 21 and the second circuit 22 are conducted.

In the embodiment of the application, the live wire wiring system of the residual current circuit breaker comprises a live wire incoming terminal and a live wire outgoing terminal, and the zero line wiring system comprises a zero line incoming terminal and a zero line outgoing terminal; through the live wire with live wire incoming line terminal access power supply line, with the live wire of live wire terminal access power consumption circuit, with the zero line of zero line incoming line terminal access power supply line, with the zero line of zero line terminal access power consumption circuit to install the leakage circuit breaker between power supply line and power consumption circuit. When the moving contact 211 and the fixed contact in the actuating contact 211 system of the operating handle operating system are contacted, the zero line of the power supply circuit is electrically connected with the zero line of the power circuit, and the live wire of the power supply circuit is electrically connected with the live wire of the power circuit, so that the circuit is conducted; when the circuit needs to be disconnected or short circuit and overload occur, under the action of an electromagnetic system, a handle operating system and other systems, the moving contact 211 is separated from the fixed contact, the zero line of the power supply circuit is electrically disconnected from the zero line of the power utilization circuit, and the live wire of the power supply circuit is electrically disconnected from the live wire of the power utilization circuit, so that the circuit is disconnected.

The test circuit 2 is used for detecting whether the function of the residual current circuit breaker is normal or not, namely detecting whether the residual current circuit breaker can break the circuit in time under the condition of short circuit or overload. Wherein, first circuit 21 and second circuit 22 of test circuit 2 insert one and the other in zero line and live wire respectively, and when first circuit 21 and second circuit 22 switched on, the zero line and live wire link to each other, and the short circuit takes place for the circuit. Therefore, the first circuit 21 and the second circuit 22 are normally disconnected, and the test button 5 is pressed only in the test state, so that the first circuit 21 and the second circuit 22 are actuated to be connected to simulate the short circuit condition.

In the residual current circuit breaker that this application embodiment provided, test circuit gets the electricity through live wire incoming line terminal and zero line terminal, perhaps get the electricity through zero line incoming line terminal and live wire terminal, and adopt this kind to get the electricity mode, can make the electric leakage test state under pass two main traverse lines of mutual-inductor current vector with not for 0, thereby satisfy the work demand of mutual-inductor, can make the mutual-inductor produce the signal and transmit for PCBA promptly when the test, and then the release ejector pin motion in the actuating mechanism system, pushing mechanism's unbuckles, thereby the cut-off circuit. Therefore, the power taking mode does not need the test circuit 2 to penetrate through the transformer, and the assembly is simpler.

In some embodiments of the present application, as shown in fig. 2 and 3, the second circuit 22 includes a test resistor 221, a first conductive member 222, and a second conductive member 223 electrically connected in sequence; the test resistor 221 is installed on the first side of the partition board 1, and one end of the test resistor 221 away from the first conductive member 222 is electrically connected with the second terminal 4; a second electrically conductive member 223 is mounted on a second side of the partition 1, the second side being opposite to the first side, the second electrically conductive member 223 being adapted to be moved upon actuation of the test button 5.

Optionally, the test resistor 221 may be an optional plug-in resistor. The plug-in resistor is a current limiting element, generally having two pins and a fixed resistance value, and can limit the magnitude of the current passing through the branch to which the plug-in resistor is connected after the plug-in resistor is connected in the circuit. As shown in fig. 3, one lead of the package resistor is electrically connected to the second terminal 4, and the other lead is electrically connected to the first conductive member 222. Of course, other types of test resistors 221, such as chip resistors, may be used according to actual requirements.

The first conductive member 222 is a member having a conductive property, and functions to transmit current. Both ends of the first conductive member 222 are electrically connected to the test resistor 221 and the second conductive member 223, respectively, wherein the first conductive member 222 also needs to pass through the partition board 1 in the thickness direction since the test resistor 221 and the second conductive member 223 are located at opposite sides of the partition board 1. For example, the first conductive member 222 may be provided with a through hole 11 on the separator 1 so as to pass through the separator 1, the first conductive member 222 may be disposed at an existing gap on the separator 1 so as to pass through the separator 1, or the first conductive member 222 may be passed through the separator 1 from the outside of the separator 1.

In some embodiments, the first conductive member 222 may be a conductive wire commonly used in the art, such as a copper conductive wire, an aluminum conductive wire, and the like. The first end 2221 of the first conductive member 222 and the pin of the test resistor 221 may be clamped with each other, or may be fixedly connected together by welding, binding, or the like; the second end 2223 of the first conductor 222 is electrically connected to the second conductor 223, and the connection manner may be clamping, welding, binding, etc.

In other embodiments, the first conductive member 222 may also be a mechanical element having a conductive property. For example, referring to fig. 10, the first end 2221 of the first conductive member 222 has elasticity, and the test resistor 221 is located in the rebound direction of the first end 2221 and abuts against the first end 2221. The first end 2221 of the first conductive member 222 has a certain degree of deformation and thus has a restoring force, and can be tightly abutted against one pin of the test resistor 221 to prevent disconnection. For example, the first conductive member 222 may be a torsion spring, and coils of the torsion spring may be fixed on the partition board 1, wherein one arm of the torsion spring abuts against a pin of the test resistor 221, and the other arm of the torsion spring passes through the partition board 1 and is electrically connected to the second conductive member 223.

The second conductive member 223 is a member for establishing or breaking an electrical connection with the second circuit 22 upon actuation of the test button 5. Wherein the second conductive member 223 is electrically connected to the first conductive member 222; on the other hand, can be moved or rotated upon actuation of the test button 5 to establish electrical connection with the second electrical circuit 22 and to be electrically disconnected from the second electrical circuit 22 upon de-actuation or re-actuation of the test button 5.

As shown in fig. 4, in some embodiments of the present application, the second conductive member 223 may include a fixing portion 2231 and a conductive arm 2232, the second conductive member 223 is mounted on the partition plate 1 through the fixing portion 2231, and the conductive arm 2232 is connected to the fixing portion 2231 and can rotate around the fixing portion 2231; the test button 5, when actuated, connects or abuts the conductive arm 2232.

Alternatively, the first conductive member 222 may be electrically connected to the conductive arm 2232 of the second conductive member 223 in a normal state; or may be electrically connected to the conductive arm 2232 of the second conductive member 223 only in the electrical leakage test state, that is, under the electrical leakage test, the test button 5 actuates the conductive arm 2232 to rotate to simultaneously electrically connect the first conductive member 222 and the second circuit 22.

Optionally, the first conductive member 222 may also be connected to the fixing portion 2231 of the second conductive member 223 to avoid the position deviation of the first conductive member 222 caused by the movement of the conductive arm 2232.

In some embodiments of the present application, as shown in fig. 5, the second conductive member 223 is an elastic member, and the test button 5 is located in a rebound direction of the conductive arm 2232 of the second conductive member 223. Among them, the conductive arm 2232 of the second conductive member 223 has a certain degree of deformation, thus having a restoring force, and can be tightly abutted against the bottom of the test button 5, so that the test button 5 can be stably installed in the button installation hole without dropping, the number of installation parts is reduced, and the cost and the assembly complexity are reduced. And, after the pressing of the test button 5 is stopped, both the test button 5 and the conductive arm 2232 can be returned by the restoring force, thereby automatically disconnecting the electrical connection with the second circuit 22.

Optionally, the bottom of the test button 5 has a groove 51 opening toward the conductive arm 2232, and a portion of the conductive arm 2232 is located in the groove 51, so that the test button 5 can more firmly catch the conductive arm 2232 through the groove 51, further preventing the test button 5 from falling off the conductive arm 2232.

Exemplarily, the second conductive member 223 may be a torsion spring, a metal dome, or the like. As shown in fig. 7, when the second conductive member 223 is a torsion spring, the fixing portion 2231 includes a coil 2233 and a first arm 2234 of the torsion spring, and the conductive arm 2232 is a second arm of the torsion spring. The second side of the partition board 1 is provided with a fixing column 13, wherein a coil 2233 of the torsion spring is sleeved on the fixing column 13, and a first spring arm 2234 is abutted against or connected with the partition board 1. Therefore, when the second conductive member 223 is a torsion spring, the arrangement is more compact, and the space is more saved.

As shown in fig. 8, in some embodiments of the present application, a through hole 11 is formed in the partition board 1, the through hole 11 penetrates through the partition board 1 in a thickness direction, and the first conductive member 222 includes a first end 2221, a middle portion 2222, and a second end 2223, which are connected in sequence.

Alternatively, the first end 2221 and the middle portion 2222 of the first conductive member 222 may be located at a first side of the separator 1. Referring to fig. 8, a first receiving groove 12 is formed at a first side of the partition board 1, a via hole 11 is adjacent to the fixing post 13, a first end 2221 of the first conductive member 222 is electrically connected to the test resistor 221, a middle portion 2222 is located in the first receiving groove 12, a second end 2223 passes through the via hole 11, and a portion of the second end 2223 protruding from the via hole 11 contacts an inner wall of the coil 2233 of the torsion spring. The first receiving groove 12 can allow the middle portion 2222 of the first conductive member 222 to be embedded or received in the partition board 1, so as to avoid affecting the actions of other mechanisms. The second end 2223 of the first conductive member 222 is caught by the coil 2233 of the torsion spring (i.e., the second conductive member 223) and the fixing post 13, and is not easy to fall off, and the arrangement is more concise and space-saving.

Wherein, in order to ensure that the second end 2223 of the first conductive member 222 is firmly caught, the diameter of the coil 2233 of the torsion spring may be equal to the sum of the diameter of the fixing post 13 and the diameter of the second end 2223 of the first conductive member 222; alternatively, as shown in fig. 9, the fixing post 13 has a gap, and the length of the gap is just equal to the length of the second end 2223 of the first conductive member 222 in the radial direction of the spring coil 2233.

Alternatively, the middle portion 2222 and the second end 2223 of the first conductive member 222 may be positioned at the second side of the separator 1. A second accommodating groove is formed in the second side of the partition board 1, and the via hole 11 is located in one side, close to the test resistor 221, of the second accommodating groove; the first end 2221 of the first conductive member 222 passes through the via hole 11 to be electrically connected to the test resistor 221, the middle portion 2222 is located in the second receiving groove, and the second end 2223 is electrically connected to the second conductive member 223. The second receiving groove can allow the middle portion 2222 of the first conductive member 222 to be embedded or received in the partition board 1, so as to avoid affecting the actions of other mechanisms.

In some embodiments of the present application, as shown in fig. 11, the first circuit 21 includes a movable contact 211 and a flexible conductor 212, and the movable contact 211 is electrically connected to the first terminal 3 through the flexible conductor 212. Since the test circuit 2 uses a part of the contact system of the earth leakage breaker as the first circuit 21, the circuit structure is simplified, the number of parts is reduced, and the cost is reduced.

Fig. 11 is a schematic structural diagram of the residual current circuit breaker on the second side of the partition board 1 in the opening state provided in the embodiment of the present application, wherein in the opening state, the moving contact 211 and the fixed contact of the contact system are separated. Fig. 12 is a schematic structural diagram of the residual current circuit breaker on the second side of the partition board 1 in the closing state provided in the embodiment of the present application, wherein in the closing state, the moving contact 211 of the contact system is in contact with the stationary contact.

As shown in fig. 11 and 12, the movable contact 211 has a conductive post 2111, and the conductive post 2111 extends away from the partition board 1; the conductive post 2111 is provided such that: the second circuit 22 cannot contact the conductive post 2111 under the actuation of the pressed test button 5 in the open state, so that the first circuit 21 and the second circuit 22 cannot be conducted; in the closed state, the second circuit 22 can contact the conductive post 2111 under the actuation of the pressed test button 5, so that the first circuit 21 and the second circuit 22 are conducted.

Referring to fig. 11, in the open state, the second circuit 22 and the conductive post 2111 are far away from each other in the normal state, and at this time, even if the test button 5 is pressed, so that the test button 5 carries the second circuit 22 to move toward the conductive post 2111, the conductive post 2111 cannot be touched, and therefore, no matter whether the test button 5 is pressed or not, the first circuit 21 and the second circuit 22 cannot be electrically connected. That is to say, under the state of separating brake, moving contact 211 and static contact are separated, and no matter at this moment be the normality or the electric leakage test state, can't turn on test return circuit 2 to avoid under the state of separating brake, because of the test return circuit 2 that the maloperation pressed test button 5 and led to turn on and produce the problem of artifical leakage current, improved the security.

Referring to fig. 12, after the switch is turned on, the position of the conductive post 2111 approaches to the second circuit 22 along with the movement of the movable contact 211, so that the second circuit 22 and the conductive post 2111 are normally close to each other but are not conductive in the switch-on state, and at this time, when the test button 5 is pressed, the test button 5 will bring the second circuit 22 to move towards the conductive post 2111 and contact the conductive post 2111, so that the first circuit 21 and the second circuit 22 are conductive. That is to say, under the combined floodgate state, moving contact 211 and static contact, test circuit 2 is the disconnection under the normal condition, and test button 5 is pressed and actuates test circuit 2 and switches on under the electric leakage test state, and then live wire and zero line short circuit judge whether its function is normal through observing whether the earth-leakage protector open circuit: if the moving contact 211 is separated from the fixed contact due to the tripping of the mechanism system of the leakage protector, the leakage breaker is normal in function; if the mechanism system of the earth leakage protector is not pushed to release, the movable contact 211 and the fixed contact are still in a contact state, the function of the earth leakage breaker is abnormal, and the earth leakage breaker needs to be repaired or replaced.

To sum up, the residual current circuit breaker provided by the embodiment of the application has at least the following advantages:

firstly, two ends of a test loop 2 are respectively connected with a live wire incoming terminal and a zero wire outgoing terminal to get electricity, or are connected with the zero wire incoming terminal and the live wire outgoing terminal to get electricity, so that the sum of current vectors passing through two main conductors of the mutual inductor is not 0 in a leakage test state, on one hand, the working requirement of the mutual inductor can be met, and the mutual inductor can trigger a mechanism to act in time to disconnect a circuit in the test process; on the other hand, the test circuit 2 does not need to pass through a mutual inductor, so that the assembly is simpler.

Secondly, the test circuit 2 has only a single breakpoint, and by using a part of the structure in the contact system of the residual current circuit breaker as the first circuit 21 of the test circuit 2, the structure of the circuit is simplified, the complexity of the circuit arrangement is reduced, and the cost is also reduced.

Thirdly, in the opening state, even if the test button 5 is pressed due to an erroneous operation, the test circuit 2 is not conducted, thereby improving the safety of the earth leakage breaker.

Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the present application disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only.

It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.

Claims (10)

1. An earth leakage breaker, characterized in that it comprises a partition (1), a test circuit (2), a first terminal (3), a second terminal (4) and a test button (5);

the test circuit (2), the first terminal (3), the second terminal (4) and the test button (5) are all mounted on the partition (1);

the first terminal (3) and the second terminal (4) are respectively one and the other of a live wire incoming terminal and a zero wire outgoing terminal, or are respectively one and the other of a zero wire incoming terminal and a live wire outgoing terminal;

the test loop (2) comprises a first circuit (21) and a second circuit (22), the first circuit (21) is electrically connected with the first terminal (3), the second circuit (22) is electrically connected with the second terminal (4), wherein the first circuit (21) is disconnected with the second circuit (22) under a normal state, and the test button (5) pressed under an electric leakage test state actuates at least one part of the second circuit (22) to enable the first circuit (21) and the second circuit (22) to be conducted.

2. Residual current circuit breaker according to claim 1, characterized in that said second circuit (22) comprises a test resistance (221), a first electrically conductive member (222) and a second electrically conductive member (223) electrically connected in sequence;

the test resistor (221) is arranged on the first side of the partition board (1), and one end, far away from the first conductive piece (222), of the test resistor (221) is electrically connected with the second terminal (4);

the second electrically conductive member (223) is mounted on a second side of the spacer (1), the second side being opposite the first side, the second electrically conductive member (223) being adapted to move upon actuation of the test button (5).

3. The residual current circuit breaker according to claim 2, characterized in that said second conductive member (223) comprises a fixed portion (2231) and a conductive arm (2232), said second conductive member (223) being mounted on said partition (1) through said fixed portion (2231), said conductive arm (2232) being connected to said fixed portion (2231) and being rotatable about said fixed portion (2231);

the test button (5) is connected to or against the conductive arm (2232) when actuated.

4. Residual current circuit breaker according to claim 3, characterized in that said second electrically conductive member (223) is an elastic member, said test button (5) being located in the direction of the rebound of the electrically conductive arm (2232) of said second electrically conductive member (223).

5. Residual current circuit breaker according to claim 3 or 4, characterized in that the bottom of the test button (5) has a groove (51) open towards the conductive arm (2232);

a portion of the conductive arm (2232) is located in the trench (51).

6. Residual current circuit breaker according to claim 3 or 4, characterized in that the second side of the partition (1) has fixing posts (13);

the second conductive piece (223) is a torsion spring, wherein the fixing portion (2231) comprises a coil (2233) and a first spring arm (2234) of the torsion spring, the coil (2233) is sleeved on the fixing column (13), and the first spring arm (2234) is abutted against or connected with the partition plate (1); the conductive arm (2232) is a second spring arm of the torsion spring.

7. Residual current circuit breaker according to claim 6, characterized in that the partition (1) is provided with a through hole (11), the through hole (11) penetrating the partition (1) in the thickness direction;

the first conductive member (222) comprises a first end (2221), a middle part (2222) and a second end (2223) which are connected in sequence;

a first accommodating groove (12) is formed in the first side of the partition plate (1), and the through hole (11) is adjacent to the fixing column (13); the first end (2221) of the first conductive member (222) is electrically connected to the test resistor (221), the middle portion (2222) is located in the first receiving groove (12), the second end (2223) passes through the via hole (11), and a portion of the second end (2223) protruding from the via hole (11) is in contact with an inner wall of the coil (2233).

8. Residual current circuit breaker according to claim 7, characterized in that said first end (2221) of said first electrically conductive member (222) is elastic and said test resistance (221) is located in the direction of the rebound of said first end (2221) and against said first end (2221).

9. Residual-current circuit breaker according to claim 1, characterized in that said first electric circuit (21) comprises a movable contact (211) and a flexible conductor (212), said movable contact (211) being electrically connected to said first terminal (3) through said flexible conductor (212).

10. Residual current circuit breaker according to claim 9, characterized in that said movable contact (211) has a conductive post (2111), said conductive post (2111) extending away from said partition (1);

wherein the conductive post (2111) is arranged such that: the second circuit (22) cannot contact the conductive column (2111) under the actuation of the pressed test button (5) in the opening state, so that the first circuit (21) and the second circuit (22) cannot be conducted; in a closing state, the second circuit (22) can be contacted with the conductive column (2111) under the actuation of the pressed test button (5), so that the first circuit (21) and the second circuit (22) can be conducted.

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