Leakage protection circuit breaker

Abstract

An electric leakage protection circuit breaker comprises an electric leakage protection electrode and at least one circuit breaker electrode which are arranged side by side, and the electric leakage protection electrode comprises a zero sequence current transformer, an electronic assembly board, an electric leakage tripper, an indicating mechanism and an electric leakage power supply contact piece set composed of a movable contact piece and a static contact piece. An electric leakage power supply contact piece group formed by the movable contact piece and the static contact piece is connected in series in a power supply loop for supplying power to the electronic component board and / or the electric leakage release; the circuit breaker pole comprises a handle, an operating mechanism, a moving contact and a static contact, the moving contact is connected with the operating mechanism, the indicating button drives the contact piece to make contact with the static contact piece when located at the first indicating position, and the electric leakage tripping iron core acts to trigger the operating mechanism of the circuit breaker pole to trip during electric leakage. Meanwhile, the electric leakage tripping iron core drives the indication button to be switched from the first indication position to the second indication position, when the indication button moves to the second indication position, the movable contact piece and the static contact piece are separated, and the electric leakage tripping device and the electronic assembly board can be prevented from being burnt out.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of low-voltage electrical apparatus, in particular to a leakage protection circuit breaker. BACKGROUND

[0002] Low-voltage circuit breakers are commonly used to distribute electrical energy and to protect lines and electrical equipment from overload and short circuits, and can also be used for infrequent switching of lines and infrequent starting of motors.

[0003] In particular, electronic leakage circuit breakers, since the electronic component board is usually powered by the outgoing line of the leakage circuit breaker, it is stipulated that the leakage circuit breaker can only be connected to the power supply at the incoming line. However, if the user mistakenly connects the power supply to the outgoing line of the product during use, the electronic component board will always be in a powered state, although the leakage tripping device can still act when there is a leakage current in the main circuit or when the test button is pressed, but this can easily cause the tripping coil to burn out and cause the leakage protection function to fail.

[0004] When the load is a high inductive or high capacitive load, if the main circuit power supply is suddenly disconnected or the circuit breaker is disconnected, the high inductive or high capacitive load will generate a reverse electromotive force. If the electronic component board of the electronic leakage circuit breaker is powered through the outgoing line, the reverse electromotive force generated by the load will be directly added to the electronic component board. At this time, if there is a leakage current in the main circuit or the test button is pressed, the above-mentioned reverse electromotive force directly added to the electronic component board will be directly added to both ends of the leakage tripping coil, causing the coil to burn out and causing the leakage function to fail. SUMMARY

[0005] The purpose of the present application is to overcome at least one of the defects of the prior art and provide a leakage protection circuit breaker.

[0006] To achieve the above-mentioned purpose, the present application adopts the following technical scheme:

[0007] A leakage protection circuit breaker, comprising a leakage protection pole and at least one circuit breaker pole arranged side by side, the leakage protection pole comprising a zero sequence current transformer, an electronic component board and a leakage tripping device, the circuit breaker pole comprising a handle, an operating mechanism, a moving contact and a stationary contact, the moving contact being connected to the operating mechanism, the handle driving the moving contact and the stationary contact to contact or separate through the operating mechanism, realizing the conduction and disconnection of the main circuit of the circuit breaker pole, the leakage tripping device comprising a leakage tripping coil and a leakage tripping core driven by the leakage tripping coil,

[0008] Further comprising an indication mechanism, the indication mechanism comprising an indication button, the indication button being movably arranged and having a first indication position and a second indication position;

[0009] The electric leakage protection pole is provided with an electric leakage power supply contactor group composed of a moving contact and a static contact, and the electric leakage power supply contactor group composed of the moving contact and the static contact is connected in series in a power supply loop for supplying power to the electronic component board and / or the electric leakage tripping device;

[0010] The driving contact and the static contact are in contact when the indication button is located at the first indication position;

[0011] When electric leakage occurs, the electric leakage tripping iron core triggers the operating mechanism of the circuit breaker pole to trip, and the electric leakage tripping iron core triggers the indication button to switch from the first indication position to the second indication position, and when the indication button moves to the second indication position, the moving contact is separated from the static contact.

[0012] Preferably, the indication mechanism comprises an indication button, a push plate and an indication spring, the indication spring is connected with the indication button, the indication button comprises an indication part and a locking part,

[0013] The indication part is pressed to compress the indication spring and move the indication button to the first indication position in the direction of the retracted housing, and the push plate locks the locking part to lock the indication button at the first indication position, and the indication button drives the contact and the static contact to be in contact;

[0014] When the electric leakage tripping device triggers the circuit breaker pole to trip, the electric leakage tripping iron core unlocks the locking part with the push plate, and the indication spring moves the indication button to move the indication part to the second indication position in the direction of extending out of the housing, and the moving contact is reset and separated from the static contact.

[0015] Preferably, the indication button indirectly drives the contact through a separate driving member.

[0016] Preferably, the indication button is provided with an integral driving part, and the indication button directly drives the contact through the driving part.

[0017] Preferably, the push plate comprises a rotationally arranged push plate locking part, the push plate locking part is provided with a first locking groove and a second locking groove, the first locking groove is used for sleeving the locking part of the indication button, and the second locking groove is used for penetrating the electric leakage tripping iron core, and the electric leakage tripping iron core is used for pulling the push plate to rotate to separate the first locking groove from the locking part.

[0018] Preferably, the static contact is a wiring board, and the wiring board is electrically connected with the electronic component board through a wire.

[0019] Preferably, the static contact is a rod structure, one end of the static contact is fixedly connected with the housing, and the other end of the static contact penetrates the electronic component board and is electrically connected with the electronic component board.

[0020] Preferably, the movable contact comprises a fixed part fixedly arranged on the housing and a contact part arranged to be bendable, the fixed part is connected to the second conductor to the power supply circuit, and the contact part is located between the indicating button and the static contact.

[0021] Preferably, the movable contact comprises a fixed part fixedly arranged on the housing and a contact part arranged to be bendable, the fixed part is connected to the second conductor to the power supply circuit, and the contact part is located between the indicating button and the static contact.

[0022] Preferably, the movable contact comprises a fixed part fixedly arranged on the housing and a contact part arranged to be bendable, the fixed part is connected to the second conductor to the power supply circuit, and the contact part is located between the indicating button and the static contact.

[0023] Preferably, the movable contact comprises a fixed part fixedly arranged on the housing and a contact part arranged to be bendable, the fixed part is connected to the second conductor to the power supply circuit, and the contact part is located between the indicating button and the static contact.

[0024] Preferably, the movable contact comprises a fixed part fixedly arranged on the housing and a contact part arranged to be bendable, the fixed part is connected to the second conductor to the power supply circuit, and the contact part is located between the indicating button and the static contact.

[0025] Preferably, the movable contact comprises a fixed part fixedly arranged on the housing and a contact part arranged to be bendable, the fixed part is connected to the second conductor to the power supply circuit, and the contact part is located between the indicating button and the static contact.

[0026] The leakage protection circuit breaker of the present application comprises a movable contact and a static contact to form a leakage power supply contact group, and the indicating mechanism is connected to the leakage power supply contact group, the leakage power supply contact group is used to control the power supply of the electronic component board and / or the leakage release coil, when the indicating button is located at the first indicating position, the movable contact and the static contact are contacted to make the leakage power supply contact group closed to supply power to the electronic component board and / or the leakage release coil, when the indicating button is moved to the second indicating position, the leakage fault is indicated, and the leakage power supply contact group is disconnected, the current cannot pass through the electronic component board and / or the leakage release coil, even if the incoming line end and the outgoing line end of the circuit breaker pole are connected reversely, or the high inductive or capacitive load is connected, the leakage release coil and the electronic component board will not be burned, and the reliability of the circuit breaker can be greatly improved. The power supply from the power source is usually connected to the incoming line end and the outgoing line end of the circuit breaker pole, of course, the leakage protection circuit breaker can be provided with a separate outgoing line end and incoming line end for power supply from the power source.

[0027] In addition, the static contact passes through and is connected to the electronic component board, and is connected to the switch element on the electronic component board through the conductor printed on the electronic component board, so that the reliability is high, the assembly is convenient, and the step of welding the static contact and the wire can be omitted. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is a structural schematic diagram of the leakage protection circuit breaker of the present application;

[0029] Figure 2 is a structural schematic diagram of the leakage protection pole of the present application;

[0030] Figure 3 is the indication state of the indication button retracted shell of the present application;

[0031] Figure 4 is the indication state of the indication button extended shell of the present application;

[0032] Figure 5 is a cooperation schematic diagram of the electronic component board and the static contact of the present application;

[0033] Figure 6 is a structural schematic diagram of the moving contact of the present application;

[0034] Figure 7 is a structural schematic diagram of the indication button and the driving member of the present application;

[0035] Figure 8 is a structural schematic diagram of the push plate of the present application;

[0036] In the figure, the leakage protection pole 1; the circuit breaker pole 2; the leakage release 3; the zero sequence current transformer 31; the electronic component board 32; the leakage release iron core 33; the moving contact 4; the static contact 5; the handle 21; the first side plate 11; the second side plate 12; the first wire 71; the second wire 72; the third wire 73; the fixed part 41; the swing part 42; the connecting part 43; the indication mechanism 8; the indication button 81; the indication part 811; the locking part 812; the driving part 813; the push plate 82; the push rod locking part 821; the first locking groove 822; the second locking groove 823. DETAILED DESCRIPTION

[0037] The following embodiments given in combination with the drawings further illustrate the specific implementation of the leakage protection circuit breaker of the present application. The leakage protection circuit breaker of the present application is not limited to the description of the following embodiments.

[0038] As Figures 1-2As shown, the leakage protection circuit breaker of the embodiment includes leakage protection poles 1 and at least one circuit breaker pole 2 arranged side by side. The embodiment is provided with four circuit breaker poles 2 arranged side by side. When the circuit breaker pole 2 is a phase pole, it includes a line-in end, a line-out end, a moving contact, a static contact, an overload tripping mechanism and a short-circuit tripping mechanism, which are not shown in the main circuit diagram, and an operating mechanism for driving the moving contact and the static contact to contact and separate. The line-in end and the line-out end are respectively used for connecting a power supply and a load. The moving contact and the static contact are respectively connected with the line-in end and the line-out end. The overload tripping mechanism and the short-circuit tripping mechanism are connected in series in the main circuit. The handle 21 drives the moving contact and the static contact to contact or separate through the operating mechanism, so as to realize the conduction and disconnection of the main circuit of the circuit breaker pole 2. When the circuit breaker pole 2 is an N pole, it usually only includes a line-in end, a line-out end, a moving contact and a static contact, and an operating mechanism for driving the moving contact and the static contact to contact and separate, without an overload tripping mechanism and a short-circuit tripping mechanism. Of course, the circuit breaker pole 2 of the N pole can not be provided, and only the circuit breaker pole 2 of the phase pole can be provided. The leakage protection pole 1 includes a zero-sequence current transformer 31, an electronic component board 32 and a leakage tripping device 3. The leakage tripping device 3 includes a leakage tripping coil and a leakage tripping core 33 driven by the leakage tripping coil. The zero-sequence current transformer 31 is electrically connected with the electronic component board 32, and the electronic component board 32 is electrically connected with the leakage tripping device 3. The main circuits of the four circuit breaker poles 2 respectively pass through the zero-sequence current transformer 31. The zero-sequence current transformer 31 is used for sensing the leakage current in the main circuit and transmitting a leakage signal to a leakage detection circuit of the electronic component board 32. The leakage detection circuit is used for processing the leakage signal and driving the leakage tripping device 3 to act when the leakage signal meets the condition, so that the leakage tripping device 3 drives the operating mechanism to trip. The tripped operating mechanism drives the moving contact and the static contact to separate, disconnects the main circuit and realizes the protection function.

[0039] The operating mechanism includes a contact support and an energy storage spring connected with the contact support. The contact support is respectively provided with a rotatable jump buckle and a lock buckle. The jump buckle and the lock buckle are snap-fitted. A connecting rod is arranged between the jump buckle and the handle 21. The two ends of the connecting rod are respectively rotatably connected with the handle 21 and the jump buckle, so that the handle 21 is connected with the jump buckle through the connecting rod. When the jump buckle and the lock buckle are snap-fitted, the lock buckle locks the jump buckle and the contact support. When the handle 21 pushes the jump buckle through the connecting rod, the jump buckle can drive the contact support to rotate. When the handle 21 rotates in two opposite directions, the contact support can drive the moving contact and the static contact to contact and separate. When the contact support contacts the moving contact and the static contact, the contact support compresses the energy storage spring and is locked by the handle 21.

[0040] The leakage tripping device 3, overload tripping mechanism and short-circuit tripping mechanism can trigger the unlocking trip to drive the operating mechanism to trip when the leakage current, short-circuit current and overload current meet the conditions, respectively. At this time, the handle 21 cannot drive the contact support to rotate through the trip when rotating, and the handle 21 loses the locking of the contact support, the energy storage spring is released, the energy storage spring drives the contact support to rotate when released, so that the moving contact and the static contact are separated, and the leakage protection, short-circuit protection and overload protection functions are realized.

[0041] The short-circuit tripping device includes a short-circuit tripping coil and an iron core driven by the short-circuit tripping coil. The short-circuit tripping coil is connected with the static contact. When the short-circuit current flowing in the short-circuit tripping coil meets the action condition, the short-circuit tripping coil drives the iron core to move, and the iron core directly or indirectly triggers the unlocking of the lock and the trip.

[0042] The overload tripping device includes a bimetallic strip connected with the moving contact. When the overload current flowing in the bimetallic strip meets the action condition, the bimetallic strip is bent due to temperature rise, and then directly or indirectly triggers the unlocking of the lock and the trip.

[0043] An improved point of the embodiment is that an indication mechanism 8 cooperating with the leakage tripping device 3 is further provided. The indication mechanism 8 includes an indication button 81 movably arranged and having a first indication position and a second indication position. The leakage protection pole 1 is provided with a leakage power contact group composed of the moving contact 4 and the static contact 5, which is connected in series in a power supply circuit for supplying power to the electronic component board 32 and / or the leakage tripping device 3. The indication button 81 is driven to contact the moving contact 4 and the static contact 5 when located at the first indication position. When leakage occurs, the leakage tripping iron core 33 acts to trigger the operating mechanism of the circuit breaker pole 2 to trip, and at the same time, the leakage tripping iron core 33 triggers the indication button 81 to switch from the first indication position to the second indication position. When the indication button 81 moves to the second indication position, the moving contact 4 and the static contact 5 are separated, and the power supply circuit for supplying power to the electronic component board 32 and / or the leakage tripping device 3 is disconnected.

[0044] The electric leakage protection circuit breaker of the embodiment forms an electric leakage power supply contactor group by the moving contact 4 and the static contact 5, and is linked with the indicating mechanism 8. The electric leakage power supply contactor group controls the electric leakage tripping coil and / or the electronic component board 32 to take power from the power supply. When the indicating button 81 is in the first indicating position, the moving contact 4 and the static contact 5 are driven to contact each other, so that the electric leakage power supply contactor group is closed to supply power to the electronic component board 32 and / or the electric leakage tripping device 3. When the indicating button 81 is moved to the second indicating position, it is used to indicate that an electric leakage fault occurs, and at the same time, the electric leakage power supply contactor group is disconnected, so that the current cannot pass through the electronic component board 32 and / or the electric leakage tripping device 3. Even if the incoming line end and the outgoing line end of the circuit breaker pole 2 are connected reversely by mistake, or a high inductive or capacitive load is connected, the electric leakage tripping device 3 and the electronic component board 32 will not be burned, and the reliability of the circuit breaker can be greatly improved. The power is usually taken from the power supply through the incoming line end and the outgoing line end of the circuit breaker pole 2. Of course, the electric leakage protection circuit breaker can be provided with a separate outgoing line end and incoming line end for taking power from the power supply.

[0045] As shown in Figures 3-4 The indicating mechanism 8 includes the indicating button 81, the push plate 82 and the indicating spring 83. The indicating button 81 is movably arranged, and the indicating spring 83 is connected with the indicating button 81. The indicating button 81 includes the indicating part 811 and the locking part 812. The indicating part 811 is pressed to compress the indicating spring 83 and move the indicating button 81 to the first indicating position in the direction of the retracted housing. At the same time, the push plate 82 locks the locking part 812, so that the indicating button 81 is locked in the first indicating position, and the indicating button 81 drives the moving contact 4 and the static contact 5 to contact each other. When the electric leakage tripping device triggers the tripping of the circuit breaker pole 2, the electric leakage tripping iron core 33 drives the push plate 82 to unlock the locking part 812, and the indicating spring 83 drives the indicating button 81 to move, so that the indicating part 811 moves to the second indicating position in the direction of extending out of the housing. The moving contact 4 is reset and separated from the static contact 5.

[0046] The indicating button 81 of the embodiment is provided with an integral driving part 813. The indicating button 81 directly drives the moving contact 4 through the driving part 813. Of course, the indicating button 81 indirectly drives the moving contact 4 through an independent driving part, which also belongs to the protection scope of the present application.

[0047] As shown in Figure 8As shown, the push plate 82 comprises a rotationally arranged push plate locking portion 821, which is provided with a first locking groove 822 and a second locking groove 823, the first locking groove 822 is used to be sleeved on the locking portion 812 of the indication button 81, and the second locking groove 823 is used to pass through the electric leakage release core 33, so as to pull the push plate 82 to rotate and separate the first locking groove 822 from the locking portion 812. The push plate 82 further comprises a release driving plate connected with the push plate locking portion 821, the plane where the push plate locking portion 821 is arranged is perpendicular to the release driving plate, the release driving plate is provided with a release trigger protrusion, which is used to trigger the lock catch of the operating mechanism of the circuit breaker pole 2, so as to separate the lock catch from the trip catch.

[0048] The electric leakage release 3 comprises an electric leakage release coil and an electric leakage release core 33 driven by the electric leakage release coil, the electronic component board 32 is provided with a switch element and an electric leakage detection circuit, the switch element is connected in series in a loop for supplying power to the electric leakage release 3 from a power source, the electric leakage detection circuit can control the switch element to be closed and opened, and the electric leakage detection circuit closes the switch element when the electric leakage current in the main loop of the circuit breaker pole 2 meets the condition; the switch element can be a relay or an electronic switch such as a MOS tube. An embodiment of the electric leakage power supply contact group connected to the power supply loop is that the electronic component board 32 takes power from the power source through the electric leakage power supply contact group, and the loop for supplying power to the electronic component board 32 is regarded as the power supply loop, and the electric leakage power supply contact group is only used to control the power supply loop for supplying power to the electronic component board 32; or, the electric leakage release coil, the switch element and the electric leakage power supply contact group are connected in series to take power from the power source as the power supply loop, and the electric leakage power supply contact group is used to control the power supply loop for supplying power to the electric leakage release coil of the electric leakage release 3. Of course, the electric leakage power supply contact group can also be used to control the power supply loop for supplying power to the electronic component board 32 and the electric leakage release coil at the same time.

[0049] When the indicating part 811 is pressed, the indicating button 81 is compressed and moves to the first indicating position in the direction of the retracted housing, and the push plate 82 locks the locking part 812, so that the indicating button 81 is locked in the first indicating position. The indicating button 81 drives the contact 4 and the static contact 5 to contact, and the electronic component board 32 and / or the electric leakage tripping device 3 is powered. When the electric leakage detection circuit detects an electric leakage fault, the switch element is triggered to close. The electric leakage tripping coil attracts the electric leakage tripping core 33 to act, and when the electric leakage tripping core 33 acts, the push plate 82 triggers the lock of the circuit breaker pole 2 to be unlocked and the latch to be released. Through the operating mechanism, the moving contact and the static contact are separated and the main circuit of the circuit breaker pole 2 is disconnected. At the same time, the electric leakage tripping core 33 drives the push plate 82 to unlock the locking part 812, and the indicating spring 83 drives the indicating button 81 to move, so that the indicating part 811 moves to the second indicating position in the direction of extending out of the housing. The moving contact 4 is reset and separated from the static contact 5, and the power supply to the electronic component board 32 and / or the electric leakage tripping coil is stopped.

[0050] As shown in Figures 1-3 , the electric leakage protection pole 1 of the embodiment includes a housing composed of a first side plate 11 and a second side plate 12. The first side plate 11 is located between the second side plate 12 and the circuit breaker pole 2. The electronic component board 32, the zero-sequence current transformer 31, the electric leakage tripping device 3, the moving contact 4, the static contact 5 and the indicating mechanism 8 are arranged on the first side plate 11.

[0051] Preferably, the electronic component board 32, the moving contact 4 and the static contact 5 are arranged on the side of the zero-sequence current transformer 31. The electric leakage tripping device 3 is arranged above the zero-sequence current transformer 31. The indicating mechanism 8 is arranged above the moving contact 4 and the static contact 5. The space in the housing can be effectively utilized, and the layout is reasonable.

[0052] As shown in Figures 4-5 , the static contact 5 is fixedly arranged on the first side plate 11. The moving contact 4 is connected with the second lead wire 72. The second lead wire 72 is used to connect one end of the electric leakage tripping coil. The other end of the electric leakage tripping coil is connected with the third lead wire 73. The static contact 5 and the third lead wire 73 are respectively connected with two ends of the switch element on the electronic component board 32.

[0053] Further, the static contact 5 is in a rod structure, one end of the static contact 5 is fixedly connected with the first side plate 11, the other end of the static contact 5, i.e. the end of the static contact 5 away from the first side plate 11, penetrates the electronic component plate 32 and is electrically connected with the electronic component plate 32, the static contact 5 is connected with the switch element on the electronic component plate 32 through the conductor printed on the electronic component plate 32, so that the reliability is high, the assembly is convenient, and the step of welding the static contact 5 with the wire can be omitted. Of course, the static contact 5 can also be connected with the electronic component plate 32 by a wire, which belongs to the protection scope of the application. Of course, the static contact 5 can also be in a flat plate shape or other shapes, and the static contact 5 can also be connected without penetrating the electronic component plate 32, the electronic component plate 32 can be connected with the electronic component plate 32 by a wire, especially a multi-pole residual current leakage protection circuit breaker with multiple circuit breaker poles 2, and the electronic component plate 32 is not fixed, the static contact 5 can be a flat plate-shaped wiring board and is connected with the electronic component plate 32 by a wire.

[0054] As shown in Figures 3-4 The moving contact 4 of the embodiment is a spring, and the moving contact 4 can also be a spring or other elastic conductor with elasticity in other embodiments, the moving contact 4 includes a fixed part fixedly arranged on the shell and a contact part bendably arranged, the fixed part is connected into a power supply circuit through the second wire 72, such as being connected with the residual current release coil through the second wire 72, the contact part is located between the indication button 81 and the static contact 5, the indication button 81 pushes the contact part to bend towards the static contact 5 and contact the static contact 5 when the indication button 81 is located at the first indication position, and the moving contact 4 is reset under the self-elastic effect after the indication button 81 is reset.

[0055] Further, the moving contact 4 is in a U shape, including an oscillating part 42 and a connecting part 43 oppositely arranged, and a fixed part 41 connected between the oscillating part 42 and the connecting part 43, the shell is provided with a fixing groove 64 for inserting the fixed part 41, the fixed part 41 is limited in position by being inserted into the fixing groove 64, and the connecting part 43 is located outside the fixing groove 64 and is connected with the residual current release coil through the second wire 72.

[0056] It can be understood that the movable contact 4 is not limited to the U-shaped, and can be an elastic rod, an elastic sheet or a torsion spring, etc. The movable contact 4 can also be arranged on the driving member and move with the driving member. For example, when the indicating button 81 indirectly drives the movable contact 4 through an independent driving member, the driving member is arranged to rotate, the movable contact 4 is arranged on the driving member and moves with the driving member, the indicating button 81 drives the driving member to rotate, and the movable contact 4 is driven by the driving member to contact and separate from the static contact 5. Alternatively, the movable contact 4 can also be directly arranged on the indicating button 81 and move with the indicating button 81, and the indicating button 81 drives the movable contact 4 to contact and separate from the static contact 5, which all belong to the protection scope of the present application.

[0057] It should be noted that in the description of the present application, the terms "upper", "lower", "left", "right", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship in use, and are only for the convenience of description, and cannot be understood as indicating that the device or element referred to must have a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" and the like are only used for differentiation in description, and cannot be understood as indicating relative importance.

[0058] The above is a further detailed description of the present application in combination with specific preferred embodiments, and cannot be considered as limiting the specific implementation of the present application. For ordinary skilled persons in the technical field to which the present application belongs, a number of simple deductions or substitutions can be made without departing from the concept of the present application, and all should be considered as falling within the protection scope of the present application.

Claims

1. A residual current circuit breaker, comprising residual current protection poles (1) arranged side by side and at least one circuit breaker pole (2), wherein the residual current protection pole (1) comprises a zero-sequence current transformer (31), an electronic component board (32) and a residual current trip unit (3), and the circuit breaker pole (2) comprises a handle (21), an operating mechanism, a moving contact and a stationary contact, wherein the moving contact is connected to the operating mechanism, and the handle (21) drives the moving contact to contact or separate from the stationary contact through the operating mechanism to realize the main circuit of the circuit breaker pole (2) being connected and disconnected, and the residual current trip unit (3) comprises a residual current trip coil and a residual current trip core (33) driven by the residual current trip coil. Its features are: It is also provided with an indicator mechanism (8), which includes an indicator button (81), which is movable and has a first indicator position and a second indicator position; The leakage protection electrode (1) is provided with a leakage power supply contact group consisting of a moving contact (4) and a stationary contact (5). The leakage power supply contact group consisting of the moving contact (4) and the stationary contact (5) is connected in series in the power supply circuit that supplies power to the electronic component board (32) and / or the leakage trip unit (3). When the indicator button (81) is in the first indicator position, the drive contact (4) and the stationary contact (5) make contact; When leakage occurs, the leakage tripping core (33) triggers the tripping mechanism of the circuit breaker pole (2) to trip. At the same time, the leakage tripping core (33) triggers the indicator button (81) to switch from the first indicator position to the second indicator position. When the indicator button (81) moves to the second indicator position, the moving contact (4) separates from the stationary contact (5).

2. The residual current circuit breaker according to claim 1, characterized in that: The indicating mechanism (8) includes an indicating button (81), a push plate (82), and an indicating spring (83). The indicating spring (83) is connected to the indicating button (81). The indicating button (81) includes an indicating part (811) and a locking part (812). Pressing the indicator part (811) can cause the indicator button (81) to compress the indicator spring (83) and move towards the retracted housing to the first indicator position. At the same time, the push plate (82) locks the locking part (812), locking the indicator button (81) in the first indicator position. The indicator button (81) drives the contact member (4) and the stationary contact member (5) to contact. When the leakage current trip unit triggers the circuit breaker pole (2) to trip, the leakage current trip core (33) drives the push plate (82) to unlock the locking part (812), and the indicator spring (83) drives the indicator button (81) to move, so that the indicator part (811) moves to the second indicator position in the direction of extending out of the housing, and the moving contact (4) is reset and separated from the stationary contact (5).

3. The residual current circuit breaker according to claim 1, characterized in that: The indicator button (81) indirectly drives the contact (4) through an independent drive component.

4. The residual current circuit breaker according to claim 1, characterized in that: The indicator button (81) is provided with an integrated drive unit (813), and the indicator button (81) directly drives the contact member (4) through the drive unit (813).

5. The residual current circuit breaker according to claim 2, characterized in that: The push plate (82) includes a rotatably configured push plate locking part (821). The push plate locking part is provided with a first locking groove (822) and a second locking groove (823). The first locking groove (822) is used to fit onto the locking part (812) of the indicator button (81). The second locking groove (823) is used to pass through the leakage trip iron core (33). The leakage trip iron core (33) is used to pull the push plate (82) to rotate, so that the first locking groove (822) is separated from the locking part (812).

6. The residual current circuit breaker according to claim 1, characterized in that: The static contact (5) is a terminal block, which is electrically connected to the electronic component board (32) via wires.

7. The residual current circuit breaker according to claim 1, characterized in that: The static contact (5) is a rod structure. One end of the static contact (5) is fixedly connected to the housing, and the other end of the static contact (5) passes through the electronic component board (32) and is electrically connected to the electronic component board (32).

8. The residual current circuit breaker according to claim 1, characterized in that: The moving contact (4) is an elastic conductor. The moving contact (4) includes a fixed part fixedly mounted on the housing and a bendable contact part. The fixed part is connected to the power supply circuit through the second wire (72). The contact part is located between the indicator button (81) and the stationary contact (5).

9. The residual current circuit breaker according to claim 1, characterized in that: The moving contact (4) includes a swinging part (42) and a connecting part (43) arranged opposite to each other, and a fixing part (41) connected between the swinging part (42) and the connecting part (43). The fixing part (41) is inserted into the fixing groove (64) of the housing for limitation. The connecting part (43) is located outside the fixing groove (64) and is connected to the leakage trip coil through the second wire (72).

10. The residual current circuit breaker according to claim 3, characterized in that: The drive component is rotatably mounted, and the moving contact (4) is mounted on the drive component and moves with the drive component. The indicator button (81) drives the drive component to rotate.

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