CN217085228U - Electric leakage test circuit of circuit breaker and electric leakage circuit breaker - Google Patents

Abstract

The utility model discloses an electric leakage test circuit and electric leakage circuit breaker of circuit breaker relates to electrical equipment technical field, the utility model discloses an electric leakage test circuit of circuit breaker, include: the testing device comprises a testing button, a mutual inductor, a protection pole and a neutral pole, wherein the protection pole and the neutral pole penetrate through the mutual inductor, the protection pole comprises a first wiring end and a second wiring end, the neutral pole comprises a third wiring end and a fourth wiring end, the first wiring end and the third wiring end are located on the same side of the mutual inductor, the first wiring end and the fourth wiring end are connected through a connecting wire, a first breakpoint and a second breakpoint are arranged on the connecting wire, the first breakpoint controls the on-off of the first breakpoint through the on-off of a moving contact and a static contact of a circuit breaker, and the second breakpoint is connected with the testing button so as to control the on-off of the second breakpoint through the testing button. The utility model provides a leakage test circuit of circuit breaker can be when leakage circuit breaker disconnection, even press the test button, the test circuit does not switch on to protection leakage circuit breaker.

Description

Electric leakage test circuit of circuit breaker and electric leakage circuit breaker

Technical Field

The application relates to the technical field of electrical equipment, in particular to an electric leakage test circuit of a circuit breaker and an electric leakage circuit breaker.

Background

A leakage current breaker (Residual current operated circuit-breaker) is a switch which can automatically act when the leakage current in a circuit exceeds a preset value, and is used for backup protection for preventing faults such as personal electric shock, fire, line aging and the like. The leakage circuit breaker is divided into an electromagnetic type and an electronic type, a zero sequence transformer is arranged in the leakage circuit breaker, current of a protective pole and a neutral pole simultaneously passes through the zero sequence transformer, the purpose of leakage protection is achieved by detecting unbalanced current in the zero sequence transformer, when an electric shock or leakage fault occurs in a circuit, the sum of current phasors passing through the zero sequence transformer is not zero, so that leakage current is generated, and the electromagnetic type leakage circuit breaker controls the opening of the circuit breaker according to the leakage current so as to achieve the purpose of automatically cutting off a power supply; the electronic leakage circuit breaker controls the circuit breaker to open according to the leakage current signal through the controller so as to achieve the purpose of automatically cutting off the power supply.

The leakage circuit breaker mostly has a leakage test button device, and the leakage test button is a test device for simulating leakage current, and is used for enabling a user to regularly detect whether the leakage protection function of the leakage circuit breaker is normal (the leakage circuit breaker is definitely specified in the installation and use specification GB13955 and must be subjected to leakage detection once per month). The current leakage circuit breaker's electric leakage test device is in the off-state after the circuit breaker is tripped, and after the user pressed the test button of electric leakage circuit breaker, the test loop can switch on and make the electric leakage protection function part continuously work (continuously send the electric leakage signal for the circuit breaker) and lead to the electronic component of electric leakage protection function part to burn out to damage whole electric leakage circuit breaker.

SUMMERY OF THE UTILITY MODEL

An object of this application is to provide an electric leakage test circuit and electric leakage circuit breaker of circuit breaker, can be when the electric leakage circuit breaker disconnection, even press the test button, the test circuit nonconducting to protection electric leakage circuit breaker.

An embodiment of the present application provides an electric leakage test circuit of a circuit breaker in one aspect, including: the testing button comprises a testing button body, a mutual inductor, a protection pole and a neutral pole, wherein the protection pole and the neutral pole penetrate through the mutual inductor, the protection pole comprises a first wiring end and a second wiring end, the neutral pole comprises a third wiring end and a fourth wiring end, the first wiring end and the third wiring end are located on the same side of the mutual inductor, the first wiring end and the fourth wiring end are connected through a connecting wire, a first breakpoint and a second breakpoint are arranged on the connecting wire, the first breakpoint controls the on-off of the first breakpoint through the on-off of a moving contact and a static contact of the circuit breaker, and the second breakpoint is connected with the testing button so as to control the on-off of the second breakpoint through the testing button.

As an implementable manner, the first breakpoint and the second breakpoint are respectively disposed on the connection line.

As an implementable mode, the first breakpoint and the second breakpoint are arranged on the connecting line at the same point, and when the first breakpoint and the second breakpoint are disconnected, the first breakpoint and the second breakpoint face different directions respectively.

As a practical mode, the first terminal and the third terminal are connected with an external power supply, or the second terminal and the fourth terminal are connected with the external power supply.

As an implementable mode, the test button is connected with a second torsion spring, one end of the second torsion spring is a movable contact of a second breakpoint, a second conductor connected with the connecting wire is a stationary contact of the second breakpoint, and the test button is driven to drive the second torsion spring to be in contact with or separated from the second conductor to control the on-off of the second breakpoint.

As an implementation mode, the circuit breaker leakage test circuit further includes a first torsion spring disposed at the first breakpoint, one end of the first torsion spring is a movable contact of the first breakpoint, a first conductor connected to the connection line is a stationary contact of the first breakpoint, and the movable contact drives the first torsion spring to contact with the first conductor or to separate the first torsion spring from the first conductor to control the on-off of the first breakpoint.

As an implementable mode, the movable contact connected with the connecting wire is connected with a conductive part, the conductive part is a movable contact of a first breakpoint, the test button is connected with a third torsion spring, and the test button is driven to drive the third torsion spring to be in contact with the conductive part or be separated to control the on-off between the first breakpoint and the second breakpoint.

An embodiment on the other hand of this application provides a residual current circuit breaker, including the casing and set up the electric leakage test circuit of above-mentioned circuit breaker in the casing, test button sets up on the casing.

As an implementable manner, the residual current circuit breaker further comprises a residual current release electrically connected with the mutual inductor, and the residual current release is connected with the movable contacts through a tripping mechanism of the circuit breaker so as to control disconnection between the movable contacts and between the fixed contacts.

As an implementable manner, the residual current circuit breaker further includes an electromagnetic release and a thermal release, which are respectively connected with the tripping mechanism to control the disconnection between the moving contact and the static contact.

The beneficial effects of the embodiment of the application include:

the utility model provides a leakage test circuit of circuit breaker, including the test button, the mutual-inductor, pass the protection utmost point and the neutral pole of mutual-inductor, the protection utmost point includes first wiring end and second wiring end, the neutral pole includes third wiring end and fourth wiring end, first wiring end lies in the same one side of mutual-inductor with the third wiring end, first wiring end passes through the connecting wire with the fourth wiring end and is connected, the setting up of connecting wire makes the partial current in the protection utmost point pass through connecting wire flow direction fourth wiring end, and does not pass the mutual-inductor, make the current imbalance of the central utmost point in the mutual-inductor and protection utmost point, thereby produce leakage signal. The connecting line is provided with a first breakpoint and a second breakpoint, wherein the first breakpoint controls the on-off of the first breakpoint through the on-off of a moving contact and a static contact of the circuit breaker, and the second breakpoint is connected with the test button so as to control the on-off of the second breakpoint through the test button. The switching of the moving contact and the static contact means that the circuit breaker is in an opening and closing state, when the circuit breaker is closed, the moving contact and the static contact are closed to enable the first break point to be communicated, and at the moment, the button test button is pressed to enable the second break point to be communicated, so that the electric leakage test circuit is conducted, and the electric leakage function of the circuit breaker is tested; when the breaker is opened, the moving contact is disconnected with the fixed contact, so that the first breakpoint is disconnected, the test button is pressed at the moment so that the second breakpoint is connected, and the electric leakage test circuit is not connected due to the disconnection of the first breakpoint, so that the electric leakage breaker is protected. The utility model discloses a leakage test circuit of circuit breaker can be when leakage circuit breaker disconnection, even press the test button, the test circuit does not switch on to protection leakage circuit breaker.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.

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

fig. 2 is a state diagram of an electrical leakage testing circuit of a circuit breaker according to an embodiment of the present disclosure;

fig. 3 is a second state diagram of a leakage test circuit of a circuit breaker according to an embodiment of the present disclosure;

fig. 4 is a third state diagram of a leakage test circuit of a circuit breaker according to an embodiment of the present disclosure;

fig. 5 is a circuit diagram of an electric leakage testing circuit of another circuit breaker according to an embodiment of the present disclosure;

fig. 6 is a diagram of another leakage test circuit of a circuit breaker according to an embodiment of the present disclosure;

fig. 7 is a second state diagram of a leakage test circuit of another circuit breaker according to the embodiment of the present application;

fig. 8 is a third state diagram of a leakage test circuit of another circuit breaker according to an embodiment of the present disclosure;

fig. 9 is a connection diagram of a leakage test circuit and a power supply of a circuit breaker according to an embodiment of the present disclosure;

fig. 10 is a connection diagram of a leakage test circuit and a power supply of another circuit breaker according to an embodiment of the present application.

Icon: 100-leakage test circuit of circuit breaker; 110-test button; 120-a transformer; 130-a guard electrode; 140-neutral pole; 151-first terminal; 152-a second terminal; 153-third terminal; 154-fourth terminal; 160-connecting lines; 161-a first breakpoint; 162-a second breakpoint; 163-resistance; 171-a first torsion spring; 172-a second torsion spring; 173-a third torsion spring; 174-a conductive member; 175-leakage release; 176-a trip mechanism; 177-moving contact; 178-static contact; 181-a first electrical conductor; 182-a second electrical conductor.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, 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 embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the 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.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Where the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

In the description of the present application, it is further noted that, unless expressly stated or limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

Example one

In practical application, whether normal in order to regularly inspect electric leakage circuit breaker's earth leakage protection function, set up electric leakage test circuit usually, through electric leakage test circuit artificial for behind the electric leakage circuit breaker electric leakage signal whether inspection electric leakage circuit breaker can the separating brake, current electric leakage circuit breaker's electric leakage test circuit, the user can send electric leakage signal by pressing the test button of electric leakage circuit breaker, make the test circuit switch on, make electric leakage protection function part continuous work, and when electric leakage circuit breaker disconnection, continuous electric leakage signal leads to electric leakage protection function part continuous work can lead to electronic component to burn out, thereby damage whole electric leakage circuit breaker.

The utility model provides a leakage test circuit 100 of circuit breaker, as shown in FIG. 1, include: the testing button 110, the mutual inductor 120, the protection pole 130 and the neutral pole 140 penetrating through the mutual inductor 120, the protection pole 130 comprises a first terminal 151 and a second terminal 152, the neutral pole 140 comprises a third terminal 153 and a fourth terminal 154, the first terminal 151 and the third terminal 153 are located on the same side of the mutual inductor 120, the first terminal 151 and the fourth terminal 154 are connected through a connecting line 160, and a first breakpoint 161 and a second breakpoint 162 are arranged on the connecting line 160, wherein the first breakpoint 161 controls the on-off of the first breakpoint 161 through the opening and closing of a moving contact 177 and a fixed contact 178 of the circuit breaker, and the second breakpoint 162 is connected with the testing button 110 so as to control the on-off of the second breakpoint 162 through the testing button 110.

When the residual current circuit breaker is in normal operation, the current flows in opposite directions and the same magnitude in the protection pole 130 and the neutral pole 140, and the protection pole 130 and the neutral pole 140 pass through the transformer 120, so that the sum of the currents passing through the transformer 120 is zero. When electric leakage or contact faults occur in the circuit, the sum of currents passing through the mutual inductor 120 is not zero, so that an electric leakage signal is sent out, and the breaker is switched off under the action of the electric leakage signal to achieve the electric leakage protection function.

In order to test whether the leakage protection function of the residual current circuit breaker is normal, the current of the protection pole 130 is artificially controlled so that the sum of the currents passing through the neutral pole 140 and the protection pole 130 of the transformer 120 is not zero, so that the transformer 120 sends out a leakage signal. In the embodiment of the present invention, the first terminal 151 and the fourth terminal 154 are connected by the connection line 160, so that part of the current in the protection electrode 130 flows to the fourth terminal 154 of the neutral electrode 140 through the connection line 160, and the sum of the currents passing through the transformer 120 is not zero, thereby generating a leakage signal. A first breakpoint 161 and a second breakpoint 162 are arranged on the connecting line 160, and only when the first breakpoint 161 and the second breakpoint 162 are closed at the same time, the electric leakage test circuit is conducted to test the electric leakage function of the circuit breaker, wherein the on-off of the first breakpoint 161 is controlled by the on-off of a moving contact 177 and a static contact 178 of the circuit breaker, the second breakpoint 162 is connected with the test button 110 to control the on-off of the second breakpoint 162 through the test button 110, and the on-off of the moving contact 177 and the static contact 178 means that the circuit breaker is in an open-close state and a closed-close state, as shown in fig. 4, when the circuit breaker is closed, the moving contact 177 is in contact with the static contact 178 to communicate the first breakpoint 161, and at this time, the test button 110 is pressed to communicate the second breakpoint 162, so that the electric leakage test circuit is conducted to test the electric leakage function of the circuit breaker; as shown in fig. 2 and 3, when the circuit breaker is opened, the movable contact 177 is disconnected from the fixed contact 178, so that the first breakpoint 161 is disconnected, and at this time, the test button 110 is pressed to make the second breakpoint 162 conducted, and the leakage test circuit is not conducted due to the disconnection of the first breakpoint 161, so as to protect the leakage circuit breaker.

It should be noted that the transformer 120 detects the sum of currents of the currents passing through it, so the transformer 120 is a zero-sequence current transformer.

The utility model provides a leakage test circuit 100 of circuit breaker, including test button 110, mutual-inductor 120, pass protection utmost point 130 and neutral pole 140 of mutual-inductor 120, protection utmost point 130 includes first wiring end 151 and second wiring end 152, neutral pole 140 includes third wiring end 153 and fourth wiring end 154, first wiring end 151 and third wiring end 153 are located the same one side of mutual-inductor 120, first wiring end 151 passes through connecting wire 160 with fourth wiring end 154 and is connected, the setting of connecting wire 160 makes partial current in protection utmost point 130 flow to the fourth wiring end 154 of neutral pole 140 through connecting wire 160, and do not pass mutual-inductor 120, make the current imbalance of neutral pole 140 and protection utmost point 130 in the mutual-inductor 120, thereby produce the earth leakage signal. A first breakpoint 161 and a second breakpoint 162 are arranged on the connecting line 160, wherein the first breakpoint 161 is controlled to be on or off by opening and closing a moving contact 177 and a fixed contact 178 of the circuit breaker, the second breakpoint 162 is connected with the test button 110 to control the second breakpoint 162 to be on or off by the test button 110, the opening and closing of the moving contact 177 and the fixed contact 178 means that the circuit breaker is in an open state and a closed state, when the circuit breaker is closed, the moving contact 177 and the fixed contact 178 are closed to communicate the first breakpoint 161, and at the same time, the test button 110 is pressed to communicate the second breakpoint 162, so that the electric leakage test circuit is conducted, and the electric leakage function of the circuit breaker is tested; when the breaker is opened, the moving contact 177 is disconnected from the fixed contact 178, so that the first breakpoint 161 is disconnected, and at this time, the test button 110 is pressed to make the second breakpoint 162 conducted, so that the leakage test circuit is not conducted due to the disconnection of the first breakpoint 161, and thus the leakage breaker is protected. The utility model discloses a leakage test circuit 100 of circuit breaker can be when the leakage circuit breaker disconnection, even press test button 110, the test circuit also does not switch on to protection leakage circuit breaker.

Optionally, as shown in fig. 1, the first break point 161 and the second break point 162 are respectively disposed on the connection line 160.

The first break point 161 and the second break point 162 are respectively disposed on the connection line 160, such that the first break point 161 and the second break point 162 are independent of each other.

In order to cause the current in the guard pole 130 to flow along the connection line 160 to the fourth terminal 154 of the neutral pole 140, a resistor 163 is typically provided on the connection line 160, the resistor 163 being provided such that the current in the guard pole 130 is shunted through the resistor 163, thereby reducing the current in the guard pole 130 such that the sum of the currents through the transformer 120 is non-zero, thereby signaling leakage.

When the resistor 163 is provided on the connection line 160, the first break point 161 and the second break point 162 may be provided on the connection line 160 on both sides of the resistor 163, or may be provided on the connection line 160 on one side of the resistor 163.

In an implementation manner of the embodiment of the present invention, as shown in fig. 9 and 10, the first terminal 151 and the third terminal 153 are connected to the external power source, or the second terminal 152 and the fourth terminal 154 are connected to the external power source.

The circuit breaker is arranged between the external power supply and the load and used for controlling the current supply or disconnection of the external power supply to the load. When external power supply is connected with the circuit breaker, two lines of external power supply are connected with first wiring terminal 151 and third wiring terminal 153 respectively, perhaps, two lines of external power supply are connected with second wiring terminal 152 and fourth wiring terminal 154 respectively to guarantee that the circuit breaker can normally work, realize earth leakage protection function.

Optionally, as shown in fig. 2 and fig. 3, the test button 110 is provided with a second torsion spring 172, one end of the second torsion spring 172 is a movable contact of the second breakpoint 162, the second conductor 182 connected to the connection line 160 is a stationary contact of the second breakpoint 162, and the test button 110 is driven by the second torsion spring 172 to contact with the second conductor 182 or to be separated to control on/off of the second breakpoint 162.

As shown in fig. 3, pressing the test button 110 moves one end of the second torsion spring 172 toward the second conductive body 182, so that the second torsion spring 172 is connected to the second conductive body 182, and the second disconnection point 162 is turned on. The second break point 162 is turned on by pressing the test button 110, so that the operation steps during the electric leakage test can be simplified, and after the electric leakage test is finished, the test button 110 is pressed again, and the test button 110 is rebounded and reset due to the elastic potential energy generated after the second torsion spring 172 is pressed, so that the next test can be conveniently carried out.

In an implementation manner of the embodiment of the present invention, as shown in fig. 2, fig. 3 and fig. 4, the circuit breaker leakage testing circuit further includes a first torsion spring 171 disposed at the first breakpoint 161, one end of the first torsion spring 171 is a movable contact of the first breakpoint 161, a first conductive contact 181 connected to the connection line 160 is a stationary contact of the first breakpoint 161, and the movable contact 177 is driven to drive the first torsion spring 171 to contact with the first conductive contact 181 or to separately control the on-off of the first breakpoint 161.

One end of first torsion spring 171 and the handle block of circuit breaker, when moving contact 177 receives the drive motion, moving contact 177 and the contact of static contact 178, moving contact 177 moves and can drive the handle motion, the handle can drive the one end motion and the contact of first electric conductor 181 of first torsion spring 171, thereby make first breakpoint 161 closed, through opening and shutting of moving contact 177 or the first breakpoint 161 of handle control, can make opening and shutting of first breakpoint 161 and the opening and shutting of earth leakage circuit breaker synchronous, thereby when making earth leakage circuit breaker break, first breakpoint 161 is not closed, thereby make the electric leakage test circuit can not switch on.

Example two

The utility model provides still provide another kind of electric leakage test circuit 100 of circuit breaker, different from the embodiment one, as shown in FIG. 5, FIG. 6, on first breakpoint 161 and second breakpoint 162 set up connecting wire 160 with the same point, when first breakpoint 161 and second breakpoint 162 break off, respectively towards different directions.

When the first breaking point 161 and the second breaking point 162 are opened, they are respectively oriented in different directions, when the breaker is closed, the first breaking point 161 is returned to the central position, when the test button 110 is pressed, the second breaking point 162 is closed, the second breaking point 162 is returned to the central position, when the first breaking point 161 and the second breaking point 162 are simultaneously returned to the central position, the first breaking point 161 and the second breaking point 162 are contacted, so that the leakage test short circuit is conducted.

As shown in fig. 5 and 8, only when the first breakpoint 161 and the second breakpoint 162 are closed simultaneously, the leakage test circuit is turned on, so that only when the circuit breaker is closed, the test button 110 is pressed to turn on the leakage test circuit, as shown in fig. 6 and 7, when the circuit breaker is disconnected, the test button 110 is pressed to turn on the leakage test circuit, thereby avoiding that the leakage test circuit is turned on to burn out the electronic component of the leakage protection function part when the circuit breaker is disconnected.

In an implementation manner of the embodiment of the present invention, as shown in fig. 7, the movable contact 177 connected to the connection line 160 is connected to the conductive component 174, the conductive component 174 is the movable contact of the first breakpoint 161, the test button 110 is connected to be provided with the third torsion spring 173, and the test button 110 is driven to drive the third torsion spring 173 to contact with the conductive component 174 or to separately control the on-off of the first breakpoint 161 and the second breakpoint 162.

When the circuit breaker is closed, as shown in fig. 8, the movable contact 177 moves to the position of the fixed contact 178 to contact with the fixed contact 178, the other end of the movable contact 177 approaches to the third torsion spring 173, the other end of the movable contact 177 is provided with the conductive component 174 connected with the movable contact 177, so that the conductive component 174 approaches to the third torsion spring 173, so that the first breakpoint 161 is closed, the test button 110 is connected with the third torsion spring 173, when the test button 110 is pressed, the swinging end of the third torsion spring 173 approaches to the conductive component 174, so that the second breakpoint 162 is closed, and when the first breakpoint 161 and the second breakpoint 162 are closed simultaneously, the electric leakage test circuit is conducted. When one of the first breakpoint 161 and the second breakpoint 162 is not closed, the leakage test circuit is not turned on.

After the electrical leakage test is finished, the test button 110 is released from being pressed, and the test button 110 is restored by the elastic potential of the third torsion spring 173 to perform the next test.

The present invention is not limited to the specific structure of the conductive component 174, as long as the connection between the movable contact 177 and the third torsion spring 173 can be realized, and the conductive component 174 may be a metal rivet.

EXAMPLE III

The embodiment of the application also discloses an electric leakage circuit breaker, which comprises a shell and an electric leakage test circuit 100 arranged in the shell and used for the circuit breaker, wherein the test button 110 is arranged on the shell. The electrical leakage breaker includes the same structure and advantageous effects as the electrical leakage test circuit 100 of the breaker in the foregoing embodiment. The structure and the advantageous effects of the leakage testing circuit 100 of the circuit breaker have been described in detail in the foregoing embodiments, and are not described herein again.

Optionally, as shown in fig. 1 and fig. 2, the residual current circuit breaker further includes a residual current release 175 electrically connected to the transformer 120, and the residual current release 175 is connected to the movable contacts 177 through a trip mechanism 176 of the circuit breaker to control the disconnection between the movable contacts 177 and between the fixed contacts 178.

When the electric leakage test circuit is turned on, the mutual inductor 120 senses an electric leakage signal and transmits the electric leakage signal to the electric leakage release 175, the electric leakage release 175 controls the release mechanism 176 according to the electric leakage signal, the release mechanism 176 performs a disconnection operation, so that the movable contact 177 moves in a direction away from the fixed contact 178, and the movable contact 177 is disconnected from the fixed contact 178.

It should be noted that the leakage release 175 is an electromagnetic leakage release 175, and after receiving the leakage signal, a push rod on the leakage release 175 is ejected to strike the release mechanism 176, so that the release mechanism 176 is released, and the movable contact 177 is driven to move in a direction away from the stationary contact 178.

When the leakage release 175 works, continuous current is needed to provide energy, current flows in the neutral pole 140 and the protective pole 130, the leakage release 175 is directly connected with the protective pole 130 and the neutral pole 140, and the current is obtained from the neutral pole 140 and the protective pole 130 to provide energy for the leakage release 175, so that the circuit connection in the circuit breaker can be simplified. It should be noted that the leakage release 175 may draw current directly from the neutral pole 140 and the protection pole 130, or may draw current by other power supply methods.

The utility model discloses in an achievable mode of embodiment, electric leakage circuit breaker still includes electromagnetic trip and thermal release, and electromagnetic trip and thermal release are connected with tripping device 176 respectively to control the disconnection between moving contact 177 and the static contact 178.

When the current passing through the residual current circuit breaker is larger than the set short circuit action circuit, the electromagnetic release acts, wherein the electromagnetic release comprises a movable iron core, a static iron core and a push rod, the movable iron core acts and pushes the push rod, the push rod moves to push the release mechanism 176, the release mechanism 176 acts to drive the movable contact 177 to move so that the movable contact 177 is separated from the static contact 178, and therefore the circuit is disconnected, and the short circuit protection function of the residual current circuit breaker is achieved.

When the leakage circuit breaker is switched on, the moving contact 177 is in contact with the fixed contact 178, current flows through the moving contact 177 and the fixed contact 178, the thermal release is connected with the moving contact 177, when the current in the moving contact 177 exceeds the rated current, the current in the thermal release also exceeds the rated current, the thermal release can generate heat and accumulate, and when the temperature in the thermal release exceeds the preset temperature, the thermal release bends and drives the tripping mechanism 176 to trip, so that the moving contact 177 moves towards the direction far away from the fixed contact 178. The arrangement of the thermal release enables the electric leakage circuit breaker to automatically open when the temperature of the thermal release exceeds a certain value, and the overheating protection of the circuit is realized.

It should be noted that the electromagnetic trip and the thermal trip are disposed on the protection pole 130, the moving contact of the protection pole 130 of the thermal trip is connected, and the static contact 178 of the protection pole 130 is wound on the electromagnetic trip to implement the short-circuit protection function and the overheating protection function.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (10)

1. An electrical leakage test circuit (100) for a circuit breaker, comprising: a test button (110), a transformer (120), a guard pole (130) and a neutral pole (140) passing through the transformer (120); the protection pole (130) comprises a first terminal (151) and a second terminal (152), the neutral pole (140) comprises a third terminal (153) and a fourth terminal (154), the first terminal (151) and the third terminal (153) are located on the same side of the transformer (120), the first terminal (151) and the fourth terminal (154) are connected through a connecting line (160), and a first breakpoint (161) and a second breakpoint (162) are arranged on the connecting line (160), wherein the first breakpoint (161) controls the on-off of the first breakpoint (161) through the opening and closing of a movable contact (177) and a fixed contact (178) of the circuit breaker, and the second breakpoint (162) is connected with the test button (110) so as to control the on-off of the second breakpoint (162) through the test button (110).

2. The electrical leakage test circuit (100) of a circuit breaker according to claim 1, wherein the first disconnection point (161) and the second disconnection point (162) are respectively provided on the connection line (160).

3. The electrical leakage test circuit (100) of a circuit breaker according to claim 1, wherein the first disconnection point (161) and the second disconnection point (162) are disposed on the connection line (160) at the same point, and the first disconnection point (161) and the second disconnection point (162) are respectively oriented in different directions when disconnected.

4. The electrical leakage test circuit (100) of a circuit breaker according to claim 1, wherein the first terminal (151) and the third terminal (153) are connected to an external power source, or,

the second terminal (152) and the fourth terminal (154) are connected with the external power supply.

5. The electrical leakage test circuit (100) of the circuit breaker as claimed in claim 2, wherein a second torsion spring (172) is connected to the test button (110), one end of the second torsion spring (172) is a moving contact of the second breaking point (162), a second electrical conductor (182) connected to the connection line (160) is a stationary contact of the second breaking point (162), and the test button (110) is driven to contact or separate one end of the second torsion spring (172) from the second electrical conductor (182) to control the on/off of the second breaking point (162).

6. The electrical leakage testing circuit (100) of the circuit breaker as claimed in claim 5, further comprising a first torsion spring (171) disposed at the first disconnection point (161), wherein one end of the first torsion spring (171) is a moving contact of the first disconnection point (161), the first electrical conductor (181) connected to the connection line (160) is a stationary contact of the first disconnection point (161), and the moving contact (177) drives one end of the first torsion spring (171) to contact or separate from the first electrical conductor (181) to control the on/off of the first disconnection point (161).

7. The electrical leakage testing circuit (100) of the circuit breaker according to claim 3, wherein a movable contact (177) connected to the connecting line (160) is connected to a conductive member (174), the conductive member (174) is a movable contact of the first breaking point (161), a third torsion spring (173) is connected to the testing button (110), and the testing button (110) is driven to contact or separate the third torsion spring (173) from the conductive member (174) to control the on/off of the first breaking point (161) and the second breaking point (162).

8. Residual current circuit breaker, characterized in that it comprises a casing and a residual current test circuit (100) of the circuit breaker according to any one of claims 1 to 7 arranged inside said casing, said test button (110) being arranged on said casing.

9. A residual current circuit breaker as claimed in claim 8, characterized in that it further comprises: a leakage release (175) electrically connected to the transformer (120); the electric leakage release (175) is connected with the movable contact (177) through a release mechanism (176) of the circuit breaker so as to control the disconnection between the movable contact (177) and the fixed contact (178).

10. The residual current circuit breaker according to claim 9, characterized in that it further comprises an electromagnetic trip and a thermal trip, respectively connected to said tripping mechanism (176) to control the disconnection between said movable contact (177) and said stationary contact (178).

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