Control loop of circuit breaker for on-site transformation

Abstract

The utility model relates to a control loop of a circuit breaker for on-site transformation. The control loop of the circuit breaker for on-site transformation comprises a motor loop, a closing loop, a locking loop, an opening loop and a chassis lock electromagnet circuit which are arranged between aviation socket contacts of a circuit breaker mechanism chamber; the chassis truck switch auxiliary contact group is led to a circuit breaker mechanism chamber aviation socket contact, and the chassis truck switch auxiliary contact group is configured to be an eight-opening and eight-closing contact group; the circuit breaker switch auxiliary contact group is provided with a 10-opening 10-closing auxiliary switch contact group and is connected to an aviation socket contact of a circuit breaker mechanism chamber; the circuit breaker switch auxiliary contact set and the chassis truck switch auxiliary contact set are connected in a dynamic series connection mode through the magnetic latching relay array. According to the scheme provided by the invention, the replaced circuit breaker is enabled to rapidly adapt to the control circuit of the old cabinet body through the transformation, and the replacement efficiency of the circuit breaker is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of circuit breaker control circuit, and particularly relates to a control circuit of a circuit breaker for field modification. BACKGROUND

[0002] In the related art, a 10kv circuit breaker is a core component of a 10kv switch cabinet, and a control circuit of the circuit breaker is part of a control circuit of the switch cabinet, which is used for closing and opening operation of the circuit breaker and receiving state signals of the circuit breaker, such as a closing position, an opening position, a spring energy storage state, a low pressure locking and the like. It is a low voltage (usually DC 110V or DC 220V) and small current signal and instruction transmission circuit system. An aviation plug on the circuit breaker is a physical interface for connecting the circuit breaker with the control circuit of the switch cabinet, and a connection relationship thereof directly determines whether the circuit breaker can be correctly controlled, monitored and interlocked.

[0003] Due to comprehensive factors such as equipment service life, modification cost and the like, some substations have a demand for replacing the circuit breaker. The switch cabinet is not replaced, but only the circuit breaker is replaced. Since line load is temporarily transferred, it is required that the time for replacing the circuit breaker in the field cannot be too long, and normal power supply needs to be quickly restored. However, the old substation has a problem that equipment drawing data is not complete, and sometimes is not accurate, and the circuit breaker control circuit (connected through a 58-pin aviation plug) may have a compatibility problem with the switch cabinet.

[0004] If it is found that the control circuit of the circuit breaker is inaccurate or the aviation plug of the replaced circuit breaker is incompatible with the existing cabinet, the control circuit of the circuit breaker needs to be modified in the field, which prolongs the power-off time of field modification. In addition, the demand for circuit breaker contacts in the field is uncertain, and is limited by the 58-pin aviation plug, and many backup contacts cannot be made. If many contacts of the chassis trolley are prepared, the contacts of the control circuit auxiliary switch may not be enough, and vice versa. Moreover, the contacts of the chassis trolley need to be wired, and the circuit breaker needs to be lifted and separated from the chassis trolley, which is difficult to achieve in the field.

[0005] Therefore, it is necessary to overcome the limitation of the 58-pin aviation plug interface resource, solve the uncertainty of the demand for contacts in the field, and realize quick modification of the control circuit of the circuit breaker. INVENTION CONTENTS

[0006] To solve or partially solve the problems in the related art, the present application provides a control circuit of a circuit breaker for field modification, and aims to solve the problem that a substation has a replaced circuit breaker control circuit and a control circuit is incompatible.

[0007] The present application provides a control circuit for a circuit breaker for on-site retrofitting, comprising: a circuit breaker switch auxiliary contact group, a chassis switch auxiliary contact group, a motor circuit, a closing circuit, a locking circuit, an opening circuit, and a chassis lock electromagnet circuit; the motor circuit, closing circuit, locking circuit, opening circuit, and chassis lock electromagnet circuit are installed between the contacts of the aviation socket in the circuit breaker mechanism compartment; wherein the aviation socket contacts match the aviation plug and have 58 contacts; the chassis switch auxiliary contact group is connected to the aviation socket contacts in the circuit breaker mechanism compartment, and the chassis switch auxiliary contact group is configured as an 8-open 8-closed contact group; the circuit breaker switch auxiliary contact group is configured as a 10-open 10-closed auxiliary switch contact group, which is connected to the aviation socket contacts in the circuit breaker mechanism compartment; the circuit breaker switch auxiliary contact group and the chassis switch auxiliary contact group are dynamically connected in series via a magnetic latching relay array; and two pairs of spare contacts are reserved on both the circuit breaker switch auxiliary contact group and the chassis switch auxiliary contact group.

[0008] Optionally, in some embodiments, the chassis switch auxiliary contact group includes: a group of normally open circuit breaker relay switch QF, normally closed circuit breaker relay switch QF, normally closed chassis test position switch S8 and normally open chassis working position switch S9 connected in parallel on the same aviation socket contact, and the other end of the circuit is connected to four different aviation socket contacts to form a five-port loop; two groups of normally closed chassis test position switches S8 connected to the aviation socket contacts and normally closed circuit breaker relay switch QF in parallel; two groups of normally open chassis working position switches S9 connected to the aviation socket contacts and normally open circuit breaker relay switch QF in series; a group of normally closed chassis test position switch S8 and normally open chassis working position switch S9 connected in parallel on the same aviation socket contact, and the other end of the circuit is connected to two different aviation socket contacts to form a three-port loop; two groups of normally closed chassis test position switches S8 connected to the two aviation socket contacts; two groups of normally open chassis working position switches S9 connected to the two aviation socket contacts.

[0009] Optionally, in some embodiments, the circuit breaker switch auxiliary contact group includes: four groups of normally open circuit breaker switches S connected to the two aviation socket contacts, and four groups of normally closed circuit breaker switches S connected to the two aviation socket contacts.

[0010] Optionally, in some embodiments, the circuit breaker switch auxiliary contact group and the chassis switch auxiliary contact group are dynamically connected in series through a magnetic latching relay array, including: four groups of circuits in the circuit breaker switch auxiliary contact group and four groups of circuits in the chassis switch auxiliary contact group are connected through four magnetic latching relays; the four groups of circuits in the chassis switch auxiliary contact group are a group of normally closed chassis test position switches S8 connected to the two aviation socket contacts, a group of normally open chassis working position switches S9 connected to the two aviation socket contacts, a group of normally closed chassis test position switches S8 connected to the aviation socket contacts and a normally closed circuit breaker relay switch QF in parallel, and a group of normally open chassis working position switches S9 connected to the aviation socket contacts and a normally open circuit breaker relay switch QF in series; the four groups of circuits in the circuit breaker switch auxiliary contact group are any four groups of chassis switch auxiliary contacts.

[0011] Optionally, in some embodiments, a dip switch group is provided on the coil circuit of the magnetic latching relay array, and the dip switch group is used to manually control the conduction of the coil circuit of the magnetic latching relay array to expand the circuit breaker switch auxiliary contact group and the chassis vehicle switch auxiliary contact group.

[0012] Optionally, in some embodiments, the motor circuit includes: an energy storage motor drive circuit and a normally closed / normally open closing spring energy storage auxiliary switch S1, the normally closed / normally open closing spring energy storage auxiliary switch S1 is connected in series on the aviation socket contact, the closing spring energy storage auxiliary switch S1 of the energy motor drive circuit is connected in series with the bridge rectifier ZLK1, and the energy storage motor M is installed on the DC output end of the bridge rectifier ZLK1; the closing circuit includes: an anti-trip switch connected in series between the two contacts of the aviation socket in sequence Relay FJ, resistor R0, jumper JP9, opening coil QF and jumper ab; closing coil HQ, jumper JP8, circuit breaker relay switch QF, closing spring energy storage auxiliary switch S1 and single-pole double-throw switch K0 are connected in parallel with the anti-trip relay FJ, resistor R0, jumper JP9, opening coil QF and two ends of jumper ab. The other end of the single-pole double-throw switch K0 is connected in parallel to the circuit breaker relay switch QF. Jumper JP10 is connected in parallel to the resistor R0, and auxiliary switch S2 is connected in parallel to the jumper JP8.

[0013] Optionally, in some embodiments, the locking circuit includes: a locking coil Y1, a resistor R1, a circuit breaker relay switch QF, a jumper JP4, a normally closed switch and a jumper JP3 connected in series between the two contacts of the aviation socket; the jumper JP11 is connected in parallel to the resistor R1, and the jumper JP4 is then led to another contact of the aviation socket, and the chassis vehicle working position switch S9 and the jumper JP2 are connected in series on the leads to form a three-port circuit; the opening circuit includes: a opening coil FQ and a QF circuit breaker relay switch connected in series between the two contacts of the aviation socket, and the lines of the opening coil FQ and the QF circuit breaker relay switch are led to another contact of the aviation socket to form a three-port circuit; the chassis lock electromagnet circuit includes a chassis vehicle locking electromagnet Y0 connected between the two contacts of the aviation socket.

[0014] The technical solution provided by this application may have the following beneficial effects:

[0015] By integrating the control circuit into the aviation socket contacts, it is convenient to quickly replace the contact connection position of the control circuit on the aviation socket to match the aviation plug pins of the new circuit breaker; by leading the chassis switch auxiliary contact group to the aviation socket contacts in the circuit breaker mechanism room, the control circuit can be directly modified on the aviation socket without lifting the chassis for on-site wiring; by connecting the chassis switch auxiliary contact group and the circuit breaker switch auxiliary contact group in series, the cross-functional call of the contacts is achieved by controlling the magnetic latching relay array to meet the on-site modification needs; through the above modification, the replaced circuit breaker can be quickly adapted to the control circuit of the old cabinet, thereby improving the efficiency of circuit breaker replacement. It should be understood that the above general description and the detailed description below are only exemplary and explanatory and cannot limit this application. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and other objects, features and advantages of the present application will become more apparent through a more detailed description of exemplary embodiments of the present application in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the present application.

[0017] Figure 1 1 is a schematic diagram of auxiliary contact connections for a control circuit of a field retrofit circuit breaker according to an embodiment of the present application;

[0018] Figure 2 1 is a schematic diagram of a control circuit of a field retrofit circuit breaker according to an embodiment of the present application;

[0019] Figure 3 This is a schematic diagram of the auxiliary contact connection control logic of the control circuit of the field retrofit circuit breaker shown in an embodiment of the present application.

[0020] Figure symbols: S-circuit breaker switch, S1-closing spring energy storage auxiliary switch, S2-auxiliary switch, S8-chassis vehicle test position switch, S9-chassis vehicle working position switch, QF-circuit breaker relay switch, HQ-closing coil, FQ-opening coil, K0-single-pole double-throw switch, R0, R1-resistors, Y1-locking coil, Y0-chassis vehicle locking electromagnet, ZLK1-bridge rectifier, M-energy storage motor, JP1~JP11-jumpers, FJ-anti-trip relay, J1~J4-magnetic latching relay array. DETAILED DESCRIPTION

[0021] The following describes embodiments of the present application in more detail with reference to the accompanying drawings. Although the accompanying drawings illustrate embodiments of the present application, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. Rather, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0022] It should be understood that although the terms "first", "second", "third", etc. may be used in this application to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0023] In the description of this application, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0024] Unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be interpreted broadly. For example, they may refer to fixed or detachable connections, or integration; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0025] Due to factors such as equipment age and retrofit costs, some substations need to replace circuit breakers. Switchgear remains, only the circuit breakers are replaced. Since line loads are temporarily shifted, on-site circuit breaker replacements must be short-lived and ensure rapid restoration of normal power. However, older substations present a challenge: equipment drawings and documentation are incomplete and sometimes inaccurate, and the circuit breaker control circuit (connected via a 58-pin aviation plug) may not be compatible with the switchgear. If the circuit breaker control circuit is inaccurate or the replacement circuit breaker's aviation plug is incompatible with the existing cabinet, the circuit breaker control circuit must be modified on-site, extending the power outage required for the retrofit. Furthermore, the uncertainty of circuit breaker contact requirements on-site, coupled with the 58-pin aviation plug, prevents the provision of a large number of spare contacts. Providing more contacts for the chassis vehicle might leave insufficient contacts for the control circuit auxiliary switch, and vice versa. Furthermore, wiring the chassis vehicle's contacts requires lifting the circuit breaker and separating it from the chassis, a difficult feat to achieve on-site.

[0026] In response to the above problems, an embodiment of the present application provides a control circuit of a circuit breaker for on-site modification, which can be integrated into the aviation socket contacts through the control circuit, making it convenient to quickly replace the contact connection position of the control circuit on the aviation socket to match the aviation plug pins of the new circuit breaker; by leading the chassis switch auxiliary contact group to the aviation socket contacts in the circuit breaker mechanism room, the control circuit can be directly modified on the aviation socket without lifting the chassis for on-site wiring; by connecting the chassis switch auxiliary contact group and the circuit breaker switch auxiliary contact group in series, cross-functional call of contacts is achieved by controlling the magnetic latching relay array to meet on-site modification needs; through the above-mentioned modification, the replaced circuit breaker can be quickly adapted to the control circuit of the old cabinet, thereby improving the efficiency of circuit breaker replacement.

[0027] The technical solutions of the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0028] Figure 1 1 is a schematic diagram of auxiliary contact connections for a control circuit of a field retrofit circuit breaker according to an embodiment of the present application.

[0029] See also Figure 1 A control circuit for a circuit breaker for on-site retrofitting includes: a circuit breaker switch auxiliary contact group, a chassis vehicle switch auxiliary contact group, a motor circuit, a closing circuit, a locking circuit, an opening circuit, and a chassis lock electromagnet circuit; the motor circuit, closing circuit, locking circuit, opening circuit, and chassis lock electromagnet circuit are installed between the aviation socket contacts in the circuit breaker mechanism chamber; wherein the aviation socket contacts match the aviation plug, and there are 58 aviation socket contacts.

[0030] The motor circuit comprises: a motor drive circuit and a normally closed / normal opening closing spring energy storage auxiliary switch S1, the normally closed / normal opening closing spring energy storage auxiliary switch S1 is connected in series on the aviation socket contact, the closing spring energy storage auxiliary switch S1 of the motor drive circuit is connected in series with the bridge rectifier ZLK1, and the energy storage motor M is installed on the DC output end of the bridge rectifier ZLK1.

[0031] The locking circuit comprises: a locking coil Y1, a resistor R1, a circuit breaker relay switch QF, a jump wire JP4, a normally closed switch and a jump wire JP3 which are connected in series between the two contacts of the aviation socket; the jump wire JP11 is connected in parallel with the resistor R1, the jump wire JP4 is led to the other contact of the aviation socket, the base car working position switch S9 and the jump wire JP2 are connected in series on the lead wire, and a three-port circuit is formed; the tripping circuit comprises: a tripping coil FQ, QF circuit breaker relay switches which are connected in series between the two contacts of the aviation socket, and the line of the tripping coil FQ, QF circuit breaker relay switches is led to the other contact of the aviation socket, and a three-port circuit is formed; and the base locking electromagnet circuit comprises a base car locking electromagnet Y0 which is connected between the two contacts of the aviation socket.

[0032] In the embodiment, the motor circuit, the closing circuit, the locking circuit, the tripping circuit and the base locking electromagnet circuit are installed between the aviation socket contacts in the circuit breaker mechanism chamber, the control circuit is integrated on the aviation socket contact, the contact position of the control circuit on the aviation socket is quickly replaced when the circuit breaker is replaced, and the pin feet of the aviation plug are matched with the new circuit breaker.

[0033] The chassis switch auxiliary contact group is led to the aviation socket contact of the circuit breaker mechanism room, and the chassis switch auxiliary contact group is configured as an 8-open and 8-closed contact group; the chassis switch auxiliary contact group includes: a group of normally open circuit breaker relay switch QF, normally closed circuit breaker relay switch QF, normally closed chassis vehicle test position switch S8 and normally open chassis vehicle working position switch S9 connected in parallel on the same aviation socket contact, and the other end of the circuit is connected to four different aviation socket contacts to form a five-port loop; two groups of normally closed chassis vehicle test position switches S8 and normally open chassis vehicle working position switches S9 connected in parallel on the aviation socket contacts A parallel circuit of the closed circuit breaker relay switch QF; two sets of normally open chassis vehicle working position switches S9 connected to the aviation socket contacts and a series circuit of the normally open circuit breaker relay switch QF; a set of normally closed chassis vehicle test position switches S8 and normally open chassis vehicle working position switches S9 connected in parallel on the same aviation socket contact, and the other end of the circuit is connected to two different aviation socket contacts to form a three-port loop; two sets of normally closed chassis vehicle test position switches S8 connected to the two aviation socket contacts; two sets of normally open chassis vehicle working position switches S9 connected to the two aviation socket contacts.

[0034] The circuit breaker switch auxiliary contact group is configured with 10 open and 10 closed auxiliary switch contact groups, which are connected to the aviation socket contacts in the circuit breaker mechanism chamber; the circuit breaker switch auxiliary contact group includes: four groups of normally open circuit breaker switches S connected to the two aviation socket contacts, and four groups of normally closed circuit breaker switches S connected to the two aviation socket contacts.

[0035] Two pairs of spare contacts are reserved on the auxiliary contact group of the circuit breaker switch and the auxiliary contact group of the chassis switch.

[0036] The circuit breaker switch auxiliary contact group and the chassis switch auxiliary contact group are dynamically connected in series through a magnetic latching relay array. Specifically, the four circuits in the circuit breaker switch auxiliary contact group are connected to the four circuits in the chassis switch auxiliary contact group through four magnetic latching relays; the four circuits in the chassis switch auxiliary contact group are a group of normally closed chassis test position switches S8 connected to the two aviation socket contacts, a group of normally open chassis working position switches S9 connected to the two aviation socket contacts, a group of normally closed chassis test position switches S8 connected to the aviation socket contacts and a normally closed circuit breaker relay switch QF in parallel, and a group of normally open chassis working position switches S9 connected to the aviation socket contacts and a normally open circuit breaker relay switch QF in series; the four circuits in the circuit breaker switch auxiliary contact group are any four groups of chassis switch auxiliary contacts.

[0037] In this embodiment, the chassis switch auxiliary contact group is led to the aviation socket contacts in the circuit breaker mechanism room, and the control circuit can be directly modified on the aviation socket without lifting the chassis for on-site wiring; the chassis switch auxiliary contact group is configured as an 8-open and 8-closed contact group, and the circuit breaker switch auxiliary contact group is configured as a 10-open and 10-closed auxiliary switch contact group, reserving as many position contacts as possible for on-site use, and the chassis switch auxiliary contact group and the circuit breaker switch auxiliary contact group are connected in series, and cross-functional call of contacts is realized by controlling the magnetic latching relay array to meet on-site modification needs.

[0038] A dip switch group is provided on the coil circuit of the magnetic latching relay array, and the dip switch group is used to manually control the coil circuit of the magnetic latching relay array to conduct, thereby expanding the auxiliary contact group of the circuit breaker switch and the auxiliary contact group of the chassis vehicle switch.

[0039] The embodiments of the present application have been described above. The above description is illustrative and not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is selected to best explain the principles of the embodiments, their practical applications, or improvements to the technology in the market, or to enable other persons skilled in the art to understand the embodiments disclosed herein.

Claims

1. A control circuit of a circuit breaker for on-site retrofitting, characterized in that: include: The circuit breaker switch auxiliary contact group, chassis switch auxiliary contact group, motor circuit, closing circuit, locking circuit, opening circuit, and chassis lock electromagnet circuit are installed between the aviation socket contacts in the circuit breaker mechanism chamber. The aviation socket contacts match the aviation plug and have 58 contacts. The chassis switch auxiliary contact group is connected to the aviation socket contacts in the circuit breaker mechanism chamber, and the chassis switch auxiliary contact group is configured as an 8-open 8-closed contact group. The circuit breaker switch auxiliary contact group is configured as a 10-open 10-closed auxiliary switch contact group, which is connected to the aviation socket contacts in the circuit breaker mechanism chamber. The circuit breaker switch auxiliary contact group and the chassis switch auxiliary contact group are dynamically connected in series via a magnetic latching relay array. Two pairs of spare contacts are reserved on each of the circuit breaker switch auxiliary contact group and the chassis switch auxiliary contact group.

2. The control circuit of the field retrofit circuit breaker according to claim 1, characterized in that: The chassis switch auxiliary contact group includes: a group of normally open circuit breaker relay switch (QF), normally closed circuit breaker relay switch (QF), normally closed chassis vehicle test position switch (S8) and normally open chassis vehicle working position switch (S9) connected in parallel on the same aviation socket contact, and the other end of the circuit is connected to four different aviation socket contacts to form a five-port loop; two groups of normally closed chassis vehicle test position switches (S8) connected to the aviation socket contacts are connected in parallel with the normally closed circuit breaker relay switch (QF); two groups of normally closed chassis vehicle test position switches (S8) connected to the aviation socket contacts are connected in parallel with the normally closed circuit breaker relay switch (QF); two groups of normally closed chassis vehicle test position switches (S8) connected to the aviation socket contacts are connected in parallel with the normally closed circuit breaker relay switch (QF); two groups of normally closed chassis vehicle test position switches (S9) connected to the aviation socket contacts are connected in parallel with the normally closed circuit breaker relay switch (S9). A normally open chassis vehicle working position switch (S9) and a normally open circuit breaker relay switch (QF) on the socket contact are connected in series; a group of normally closed chassis vehicle test position switches (S8) and normally open chassis vehicle working position switches (S9) are connected in parallel on the same aviation socket contact, and the other end of the circuit is connected to two different aviation socket contacts to form a three-port loop; two groups of normally closed chassis vehicle test position switches (S8) connected to the two aviation socket contacts; two groups of normally open chassis vehicle working position switches (S9) connected to the two aviation socket contacts.

3. The control circuit of the field retrofit circuit breaker according to claim 1, characterized in that: The circuit breaker switch auxiliary contact group includes: four groups of normally open circuit breaker switches (S) connected to the two aviation socket contacts, and four groups of normally closed circuit breaker switches (S) connected to the two aviation socket contacts.

4. The control circuit of the field retrofit circuit breaker according to claim 1, characterized in that: The method of dynamically connecting the circuit breaker switch auxiliary contact group and the chassis switch auxiliary contact group in series through a magnetic latching relay array includes: four groups of circuits in the circuit breaker switch auxiliary contact group and four groups of circuits in the chassis switch auxiliary contact group are connected through four magnetic latching relays; the four groups of circuits in the chassis switch auxiliary contact group are a group of normally closed chassis vehicle test position switches (S8) connected to two aviation socket contacts, a group of normally open chassis vehicle working position switches (S9) connected to two aviation socket contacts, a group of normally closed chassis vehicle test position switches (S8) connected to the aviation socket contacts and a normally closed circuit breaker relay switch (QF) in parallel, and a group of normally open chassis vehicle working position switches (S9) connected to the aviation socket contacts and a normally open circuit breaker relay switch (QF) in series; the four groups of circuits in the circuit breaker switch auxiliary contact group are any four groups of chassis switch auxiliary contacts.

5. The control circuit of the field retrofit circuit breaker according to claim 1, characterized in that: A dip switch group is provided on the coil circuit of the magnetic latching relay array, and the dip switch group is used to manually control the coil circuit of the magnetic latching relay array to conduct, thereby expanding the auxiliary contact group of the circuit breaker switch and the auxiliary contact group of the chassis vehicle switch.

Images