CN216649222U - Control circuit of circuit breaker - Google Patents
Control circuit of circuit breaker Download PDFInfo
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- CN216649222U CN216649222U CN202123445677.0U CN202123445677U CN216649222U CN 216649222 U CN216649222 U CN 216649222U CN 202123445677 U CN202123445677 U CN 202123445677U CN 216649222 U CN216649222 U CN 216649222U
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Abstract
The application provides a control circuit of a circuit breaker, the circuit breaker comprises a main circuit breaker coil and a main circuit breaker contact; the control circuit includes: a first control unit and a second control unit; the first control unit is used for controlling the on-off of the contacts of the main breaker, the second control unit is used for controlling the on-off of the contacts of the main breaker, and the main breaker coil, the contacts of the main breaker and the first control unit are connected to form a main control circuit; the second control unit, the first control unit and the main circuit breaker coil are connected to form a first control circuit, so that the second control unit monitors the state of the main circuit breaker coil through the first control circuit to ensure that the first control circuit stops power supply to the main circuit breaker coil when the control circuit does not reduce current passing through the main circuit breaker coil after the contacts of the main circuit breaker are conducted.
Description
Technical Field
The application relates to the technical field of circuit breakers, in particular to a control circuit of a circuit breaker.
Background
In the rail transit traction system, a circuit breaker is arranged between a power grid side and a converter and used for disconnecting a controlled circuit from the power grid side to protect the controlled circuit when overcurrent or abnormal conditions occur in the controlled circuit. The on and off of the circuit breaker need to be controlled by a corresponding control circuit.
A control circuit of the circuit breaker generally adopts a normally open relay and a normally closed relay which are arranged in a controller to control the conductive state of a controlled coil of the circuit breaker so as to control the switch state of the circuit breaker, namely when the normally open relay is closed, a normally open contact corresponding to the normally open relay is closed, so that the coil of the circuit breaker connected with the normally open contact is conductive, the contact of the circuit breaker is closed, and the controlled circuit obtains an electric signal; when the normally closed relay is disconnected, the normally closed relay is disconnected with the normally closed contact of the normally closed relay, so that the coil of the circuit breaker connected with the normally closed contact is powered off, the contact of the circuit breaker is disconnected, and the controlled circuit is disconnected with the electric signal. Because the power required by the circuit breaker to be conducted is larger than the power required by the operation of maintaining the conducting state, the control circuit reduces the current passing through the coil in a mode of switching the series circuit of the coil of the circuit breaker within the preset time after the circuit breaker is conducted so as to protect the coil of the circuit breaker in the conducting state from being burnt by conducting large current.
However, when the control circuit switches the series circuit, the coil of the circuit breaker is easily burnt out in time, and the circuit breaker is irreversibly damaged.
SUMMERY OF THE UTILITY MODEL
The application provides a control circuit of circuit breaker for solve the problem that the protection circuit breaker switches on the back circuit breaker coil and is not burnt out.
The application provides a control circuit of a circuit breaker, the circuit breaker comprises a main circuit breaker coil and a main circuit breaker contact; the control circuit includes: a first control unit and a second control unit; the first control unit is used for controlling the on-off of the contacts of the main circuit breaker, and the second control unit is used for controlling the on-off of the contacts of the main circuit breaker;
the main circuit breaker coil, the main circuit breaker contact and the first control unit are connected to form a main control circuit; the second control unit, the first control unit and the main breaker coil are connected to form a first control circuit.
Optionally, the control circuit further comprises: a main control module; the main control module is connected with the first control unit.
Optionally, the control circuit further comprises: an impedance unit;
the impedance unit, the main breaker coil, the main breaker contact and the first control unit are connected to form a main control circuit.
Optionally, the first control unit comprises a first slave breaker contact and a first slave breaker coil for controlling the first slave breaker contact to close;
the impedance unit, the main breaker coil, the main breaker contact and the first slave breaker contact are connected to form a main control circuit.
Optionally, the impedance unit comprises a current limiting resistor;
the second end of the first slave breaker contact is connected with the first end of the current-limiting resistor, the second end of the current-limiting resistor is connected with the first end of the main breaker contact, and the second end of the main breaker contact is connected with the first end of the main breaker coil; the first end of the first slave breaker contact is connected with the positive pole of the power supply, and the second end of the main breaker coil is connected with the negative pole of the power supply.
Optionally, the master control module is connected with the second end of the first slave breaker contact.
Optionally, the control circuit further comprises a third control unit;
the third control unit is connected with the first slave breaker coil to form a second control circuit.
Optionally, the third control unit comprises a third slave breaker contact and a third slave breaker coil for controlling the third slave breaker contact to close;
the first end of the third slave breaker contact is connected with the second end of the first slave breaker coil, the first end of the first slave breaker coil is connected with the positive pole of the power supply, and the second end of the third slave breaker contact is connected with the negative pole of the power supply.
Optionally, the second control unit comprises a second slave breaker contact and a second slave breaker coil for controlling the second slave breaker contact to close;
the first end of the second slave breaker contact is connected to the second end of the first slave breaker contact.
Optionally, the control circuit further comprises a fourth control unit;
the fourth control unit is connected with the second slave breaker coil to form a third control circuit.
The application provides a control circuit of a circuit breaker, the circuit breaker comprises a main circuit breaker coil and a main circuit breaker contact; the control circuit includes: a first control unit and a second control unit; the first control unit is used for controlling the on-off of the contacts of the main breaker, the second control unit is used for controlling the on-off of the contacts of the main breaker, and the main breaker coil, the contacts of the main breaker and the first control unit are connected to form a main control circuit; the second control unit, the first control unit and the main circuit breaker coil are connected to form a first control circuit, so that the second control unit monitors the state of the main circuit breaker coil through the first control circuit to ensure that the first control circuit stops power supply to the main circuit breaker coil when the control circuit does not reduce current passing through the main circuit breaker coil after the contacts of the main circuit breaker are conducted.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.
Fig. 1 is an application scenario diagram of a control circuit of a circuit breaker according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a control circuit of a circuit breaker according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of a control circuit of a circuit breaker according to another embodiment of the present application;
fig. 4 is a schematic structural diagram of a control circuit of a circuit breaker according to another embodiment of the present application.
With the above figures, there are shown specific embodiments of the present application, which will be described in more detail below. These drawings and written description are not intended to limit the scope of the inventive concepts in any manner, but rather to illustrate the inventive concepts to those skilled in the art by reference to specific embodiments.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.
The terms "first," "second," and the like in the description and in the claims of the present application and in the above-described drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged where appropriate. For example, without departing from the scope herein, the first supply area may also be referred to as the second supply area, and similarly, the second supply area may also be referred to as the first supply area.
Also, as used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context indicates otherwise.
It will be further understood that the terms "comprises," "comprising," "includes" and/or "including," when used in this specification, specify the presence of stated features, steps, operations, elements, components, items, species, and/or groups, but do not preclude the presence, or addition of one or more other features, steps, operations, elements, components, items, species, and/or groups thereof.
In the rail transit traction system, a circuit breaker is arranged between a power grid side and a converter and used for disconnecting a controlled circuit from the power grid side to protect the controlled circuit when overcurrent or abnormal conditions occur in the controlled circuit. The on and off of the circuit breaker need to be controlled by a corresponding control circuit.
A control circuit of the circuit breaker generally adopts a normally open relay and a normally closed relay which are arranged in a controller to control the conductive state of a controlled coil of the circuit breaker so as to control the switch state of the circuit breaker, namely when the normally open relay is closed, a normally open contact corresponding to the normally open relay is closed, so that the coil of the circuit breaker connected with the normally open contact is conductive, the contact of the circuit breaker is closed, and the controlled circuit obtains an electric signal; when the normally closed relay is disconnected, the normally closed relay is disconnected with the normally closed contact of the normally closed relay, so that the coil of the circuit breaker connected with the normally closed contact is powered off, the contact of the circuit breaker is disconnected, and the controlled circuit is disconnected with the electric signal. Because the power required by the circuit breaker to be conducted is larger than the power required by the operation of maintaining the conducting state, the control circuit reduces the current passing through the coil in a mode of switching the series circuit of the coil of the circuit breaker within the preset time after the circuit breaker is conducted so as to protect the coil of the circuit breaker in the conducting state from being burnt by conducting large current.
However, when the control circuit switches the series circuit, the coil of the circuit breaker is easily burnt out in time, and the circuit breaker is irreversibly damaged.
To the above technical problem, the embodiment of the present application provides a control circuit of a circuit breaker, which aims to solve the problem that a coil of the circuit breaker is not burnt after the circuit breaker is turned on. The technical idea of the application is as follows: the current change state after the circuit breaker contact corresponding to the monitoring circuit breaker coil is connected is added in a control circuit for controlling the circuit breaker coil to control the conduction state of the detector coil, so that the coil is protected from being burnt after the circuit breaker is conducted.
Fig. 1 is a diagram of an application scenario of a control circuit of a circuit breaker according to an embodiment of the present application, and as shown in fig. 1, the control circuit includes a power supply 10, a circuit breaker 11, and a controlled circuit 12. When the circuit breaker 11 is closed, the controlled circuit 12 is connected to the power source 10, and the controlled circuit 12 performs a corresponding operation based on the obtained electric signal. When an abnormal phenomenon occurs in the controlled circuit 12 or the load in the controlled circuit 12 is too large, which causes the current passing through the circuit breaker 11 to exceed a preset current value, the circuit breaker 11 may break the connection between the power source 10 and the controlled circuit 12. Wherein the on and off of the circuit breaker 11 is controlled by the control circuit 13. In one embodiment, the control circuit 13 is provided with a controller, a breaker coil and a breaker contact, and when the controller receives a circuit conduction instruction, the breaker coil is controlled to be electrified to close the breaker contact, so that the breaker is conducted; when the controller receives a circuit breaking instruction or detects that an electrical signal passing through the breaker contacts is abnormal, the control circuit 13 is stopped to supply power to the breaker coil to break the breaker contacts, and the breaker is broken, so that the controlled circuit 12 is protected.
Fig. 2 is a schematic structural diagram of a control circuit of a circuit breaker according to an embodiment of the present application. As shown in fig. 2, the circuit breaker includes a main breaker coil 22 and a main breaker contact 23, in an embodiment, the circuit breaker is a normally open relay, the main breaker contact 23 included therein is controlled by the main breaker coil 22, that is, when the main breaker coil 22 in the circuit breaker is powered on, according to the law of electromagnetic induction, two ends of the main breaker contact 23 generate magnetic fields with opposite polarities to implement pull-in, and the main breaker contact 23 is turned on, so as to implement the turn-on of the circuit breaker.
The control circuit of the circuit breaker includes: a first control unit 20 for controlling the on-off of the main breaker contacts 23 and a second control unit 21 for controlling the conduction of the main breaker contacts 21. The main breaker coil 22, the main breaker contact 23 and the first control unit 20 are connected to form a main control circuit; the second control unit 21 is connected to the first control unit 20 and the main breaker coil 22 to form a first control circuit.
More specifically, when the second control unit 21 and the first control unit 20 satisfy the turn-on condition, an electric signal is transmitted to the main breaker coil 22, the first control circuit is turned on, and when the pull-in power generated in the main breaker coil 22 satisfies the preset pull-in condition, the main breaker contact 23 is pulled in, and the external circuit of the first control unit 20 in the main control circuit is turned on. When the second control unit 21 is switched off to achieve that the control circuit stops supplying power to the main breaker coil 22 through the first control circuit, the main control circuit is still in a conducting state, i.e. the breaker is conducting. On this basis, when the first control unit 20 also stops supplying power to the main breaker coil, the main breaker contacts 23 are lowered by the power for maintaining the pull-in state, the main breaker contacts 23 are opened, and the breaker is opened.
When the second control unit 21 and the first control unit 20 both supply power to the main breaker coil 22, and when a load connected to the breaker is abnormal, the first control unit 20 can also disconnect the main control circuit to disconnect the grid side and the controlled circuit including the load to protect the controlled circuit.
In the technical scheme, on the basis that a single control unit in an original control circuit controls the on and off of the circuit breaker, another control unit is added to realize the on and off control of the circuit breaker by a plurality of control units, so that the conditions of closing and opening of contacts of the main circuit breaker are limited, and a coil of the circuit breaker is prevented from being burnt after the circuit breaker is turned on.
Fig. 3 is a schematic structural diagram of a control circuit of a circuit breaker according to another embodiment of the present application, and as shown in fig. 3, the control circuit further includes: a main control module 25 and an impedance unit 24. Wherein, the main control module for controlling the first control unit 20 to be conducted after the second control unit 21 is conducted is connected with the first control unit 25. Such connection means include, but are not limited to, electrical connections.
In the control circuit, the impedance unit 24, the main breaker coil 22, the main breaker contacts 23, and the first control unit 20 are connected to form a main control circuit. Wherein, the series connection of the impedance unit 24 in the main control circuit reduces the second control unit 21 to be disconnected, and after the circuit providing the electric signal for the main breaker coil 22 is switched from the first control circuit to the main control circuit, the current passing through the main breaker coil 22 and the power generated correspondingly match the required power of the pull-in state of the main breaker contacts, so as to prevent the damage of the large current to the main breaker coil 22.
In the above technical solution, since the main control module 25 for controlling the first control unit 20 to conduct on the basis of conducting the second control unit 21 is introduced into the control circuit, the conducting and breaking states of the coil and the contact in the control circuit are realized, the switching of the control circuit and the sequential change of the magnitude of the current passing through the main breaker coil 22 are realized, and the protection of the main breaker coil in the control circuit is realized.
Fig. 4 is a schematic structural diagram of a control circuit of a circuit breaker according to another embodiment of the present application. As shown in fig. 4, on the basis of the embodiment shown in fig. 3, the control circuit further comprises a third control unit 26 and a fourth control unit 27. The first control unit 20 comprises first slave breaker contacts 202 and a first slave breaker coil 201 for controlling the closing of the first slave breaker contacts 202. The second control unit 21 comprises a second slave breaker contact 212 and a second slave breaker coil 211 for controlling the closing of the second slave breaker contact 212. The impedance unit 24 includes a current limiting resistor. The third control unit 26 comprises third slave breaker contacts 262 and a third slave breaker coil 261 for controlling the closing of the third slave breaker contacts 262. The fourth control unit 27 comprises a fourth slave breaker contact 272 and a fourth slave breaker coil 271 for controlling the closing of the fourth slave breaker contact 272.
In the control circuit, the impedance unit 24, the main breaker coil 22, the main breaker contacts 23, and the first slave breaker contacts 202 are connected to form a master control circuit. In one embodiment, the power source positive pole a is connected in series with the first slave breaker contact 20, the current limiting resistor, the master breaker contact 23, the breaker coil 22, and the power source negative pole B to form a master control circuit.
More specifically, the power source positive pole a is connected to a first end of the first slave breaker contact 202, a second end of the first slave breaker contact 202 is connected to a first end of the current limiting resistor, a second end of the current limiting resistor is connected to a first end of the main breaker contact 23, a second end of the main breaker contact 23 is connected to a first end of the main breaker coil 22, and a second end of the main breaker coil 22 is connected to the power source negative pole B, forming a main control circuit.
Wherein the first slave breaker contact 202 is controlled by the first slave breaker coil 201 in the first control unit 20, i.e. the first slave breaker contact 202 is closed when the first slave breaker coil 201 is conducting.
A first end of the first slave breaker coil 201 is connected to the positive power supply electrode a, a second end of the first slave breaker coil 201 is connected to a first end of a third slave breaker contact 262 in the third control unit 26, and a second end of the third slave breaker contact 262 is connected to the negative power supply electrode B, thereby forming a second control circuit. When the third slave breaker contact 262 is closed, the first slave breaker coil 201 conducts electricity and the first slave breaker contact 202 is closed.
Wherein the third slave breaker contact 262 is controlled by the third slave breaker coil 261 in the third control unit 26, i.e. the third slave breaker contact 262 is closed when the third slave breaker coil 261 receives an electrical signal.
The electrical signal received by the third slave breaker coil 261 is sent by the master control module 25 connected to the third slave breaker coil 261. When the main control module 25 generates an electrical signal that the third control unit 26 is conducting, the third slave breaker coil 261 is conducting, the third slave breaker contact 262 is closed, the first slave breaker coil 201 gets the electrical signal, and the first slave breaker contact 202 is closed. The master control module 25 is also connected to a second end of the first slave breaker contact 202, and when the first slave breaker contact 202 is closed, the master control module 25 receives an electrical signal indicating that the first control module was successfully closed. The main control module 25 is a programmable FPGA chip in one embodiment.
Wherein the fourth slave breaker contact 272 is controlled by the fourth slave breaker coil 271 in the fourth control unit 27, i.e. the third slave breaker contact 262 is closed when the third slave breaker coil 261 receives an electrical signal.
The second end of the first slave breaker contact 202 is also connected to the first end of the second control unit 21 including the second slave breaker contact 212, and the second end of the second slave breaker contact 212 is connected to the first end of the main breaker coil 22, and forms a first control circuit by combining the power supply positive pole a and the power supply negative pole B. When the first slave breaker contact 202 is closed, the second slave breaker contact 212 is closed, the first control circuit is turned on, the main breaker coil 22 is turned on, the main breaker contact 23 is also closed in a follow-up manner, and the main control circuit is also closed.
Wherein the second slave breaker contact 212 is controlled by the second slave breaker coil 211 in the second control unit 21, i.e. the second slave breaker contact 212 is closed when the second slave breaker coil 211 receives an electrical signal.
A first end of the second slave breaker coil 211 is connected to the positive power supply electrode a, a second end of the second slave breaker coil 211 is connected to a first end of a fourth slave breaker contact 272 in the fourth control unit 27, and a second end of the fourth slave breaker contact 272 is connected to the negative power supply electrode B, thereby forming a third control circuit. When the fourth slave breaker contact 272 is closed, the second slave breaker coil 211 conducts electricity and the first slave breaker contact 212 is closed.
The electrical signal received by the fourth slave breaker coil 271 is sent by the master control module 25 connected to the fourth slave breaker coil 271. When the main control module 25 receives an electrical signal indicating that the first control module is successfully closed, it generates an electrical signal for turning on the fourth slave breaker coil 271 in the fourth control unit 27. When the fourth slave breaker coil 271 is conductive, the fourth slave breaker contact 272 is closed, the second slave breaker coil 211 obtains an electrical signal, the second slave breaker contact 212 is closed, and the main breaker coil 22 is closed.
Since the electrical signal through the main breaker coil 22 is provided by the first control circuit, the current in the first control circuit after the coil is closed is greater than the current required to maintain the main breaker coil 22. In order to protect the main breaker coil 22 from damage by high currents, the current through the main breaker coil 22 needs to be reduced. According to the ampere rule, the method for reducing the current comprises the steps of keeping the resistance value of a circuit in which a protected device is located unchanged, and reducing the power supply voltage; or, the power supply voltage in the circuit where the protected device is located is kept unchanged, and the resistance value in the circuit is increased.
In the control circuit of the circuit breaker provided by the application, the resistance value in the circuit is selectively increased to reduce the current passing through the protected device, namely, the resistance value in the circuit where the main breaker coil 22 is located is increased to reduce the current passing through the main breaker coil 22. Wherein the resistance value is changed by changing a device in a control circuit controlling the main breaker coil 22.
More specifically, when the main breaker coil 22 is conducting, the main breaker contacts 23 are closed, and a circuit between the second ends of the first slave breaker contacts 202 to the first end of the main breaker coil 22 is conducting, which contains a current limiting resistance.
Within a preset time range, the master control module 25 generates and sends an electrical signal for opening the second slave breaker contact 212 in the second control unit 21 to the fourth slave breaker coil 271 in the fourth control unit 27. The fourth slave breaker coil 271 stops the power supply to the second slave breaker coil 211 in the second control unit 21 by controlling the opening of the fourth slave breaker contacts 272, thereby closing the second slave breaker contacts 212, at which time the current through the master breaker coil 22 is the current from the power supply positive a through the first slave breaker contacts 202, the current limiting resistor, the master breaker contacts 23, the master breaker coil 22 to the power supply negative B.
When the circuit breaker needs to be opened, the main control module 25 generates an instruction for controlling the first slave circuit breaker contact 202 and sends the instruction to the third slave circuit breaker coil 261 in the third control unit 26, the third slave circuit breaker coil 261 loses an electric signal, the third slave circuit breaker contact 262 is opened, the first slave circuit breaker coil 201 loses an electric signal for conduction, and the first slave circuit breaker contact 202 is opened. The main breaker coil 22 loses the electrical signal to conduct, the main breaker contacts 23 open, and the breaker completes the opening operation.
In the technical scheme, the control circuit is internally provided with a first control unit, a second control unit, a third control unit, a fourth control unit and a main control module, wherein the first control unit and the second control unit are used for controlling the circuit breaker to be switched on and off, the third control unit is used for controlling the first control unit to be switched on, the fourth control unit is used for controlling the second control unit to be switched on, and the main control module is used for controlling the four control units to execute preset operation according to preset instructions and preset time, so that double-step conduction and power-off operation of the control circuit on the main circuit breaker coil is realized, and the main circuit breaker coil is protected from being damaged by large current generated by a power supply.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the invention 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, with a true scope and spirit of the application being indicated by the following claims.
It will be understood that the present application is not limited to the precise arrangements that have been 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.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: it is also possible to modify the solutions described in the previous embodiments or to substitute some or all of them with equivalents. And the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (10)
1. A control circuit for a circuit breaker, the circuit breaker comprising a main breaker coil and main breaker contacts; the control circuit includes: a first control unit and a second control unit; the first control unit is used for controlling the on-off of the contacts of the main circuit breaker, and the second control unit is used for controlling the on-off of the contacts of the main circuit breaker;
the main circuit breaker coil, the main circuit breaker contact and the first control unit are connected to form a main control circuit; the second control unit and the first control unit are connected with the main breaker coil to form a first control circuit.
2. The control circuit of claim 1, further comprising: a main control module; the main control module is connected with the first control unit.
3. The control circuit of claim 2, further comprising: an impedance unit;
the impedance unit, the main breaker coil, the main breaker contact and the first control unit form a main control circuit after being connected.
4. The control circuit of claim 3, wherein the first control unit comprises a first slave breaker contact and a first slave breaker coil for controlling the switching of the first slave breaker contact;
the impedance unit, the main breaker coil, the main breaker contact and the first slave breaker contact form a main control circuit after being connected.
5. The control circuit of claim 4, wherein the impedance unit comprises a current limiting resistor;
the second end of the first slave breaker contact is connected with the first end of the current-limiting resistor, the second end of the current-limiting resistor is connected with the first end of the main breaker contact, and the second end of the main breaker contact is connected with the first end of the main breaker coil; the first end of the first slave breaker contact is connected with the positive electrode of a power supply, and the second end of the main breaker coil is connected with the negative electrode of the power supply.
6. The control circuit of claim 5, wherein the master control module is connected to the second end of the first slave circuit breaker contact.
7. The control circuit of claim 4, further comprising a third control unit;
and the third control unit is connected with the first slave breaker coil to form a second control circuit.
8. The control circuit of claim 7, wherein the third control unit comprises a third slave breaker contact and a third slave breaker coil for controlling the third slave breaker contact to close;
the first end of the third slave breaker contact is connected with the second end of the first slave breaker coil, the first end of the first slave breaker coil is connected with the positive pole of the power supply, and the second end of the third slave breaker contact is connected with the negative pole of the power supply.
9. The control circuit of claim 5, wherein the second control unit comprises a second slave breaker contact and a second slave breaker coil for controlling the closing of the second slave breaker contact;
the first end of the second slave breaker contact is connected to the second end of the first slave breaker contact.
10. The control circuit of claim 9, further comprising a fourth control unit;
and the fourth control unit is connected with the second slave breaker coil to form a third control circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123445677.0U CN216649222U (en) | 2021-12-28 | 2021-12-28 | Control circuit of circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123445677.0U CN216649222U (en) | 2021-12-28 | 2021-12-28 | Control circuit of circuit breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216649222U true CN216649222U (en) | 2022-05-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123445677.0U Active CN216649222U (en) | 2021-12-28 | 2021-12-28 | Control circuit of circuit breaker |
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| CN (1) | CN216649222U (en) |
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- 2021-12-28 CN CN202123445677.0U patent/CN216649222U/en active Active
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| GR01 | Patent grant | ||
| GR01 | Patent grant |