CN106783396B - Isolated arc extinguishing device and arc-free switch - Google Patents
Isolated arc extinguishing device and arc-free switch Download PDFInfo
- Publication number
- CN106783396B CN106783396B CN201710143390.1A CN201710143390A CN106783396B CN 106783396 B CN106783396 B CN 106783396B CN 201710143390 A CN201710143390 A CN 201710143390A CN 106783396 B CN106783396 B CN 106783396B
- Authority
- CN
- China
- Prior art keywords
- switch
- semiconductor
- pin
- semiconductor switch
- semiconductor device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/02—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay
Landscapes
- Keying Circuit Devices (AREA)
- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
Abstract
The invention relates to an isolated arc-extinguishing device and an arc-free switch, belonging to the field of electricity, in particular to an isolated arc-extinguishing device which is suitable for being applied to an electromagnetic switch and used for arc extinguishing.
Description
Technical Field
The invention discloses an isolated arc-extinguishing device and an arc-free switch, belongs to the field of electricity, and particularly relates to an isolated arc-extinguishing device which is suitable for being applied to contactors, relays and other electromagnetic switches for arc-extinguishing purposes and is convenient to use.
Background
At present, in an electrical control system, electromagnetic switches such as a contactor and a relay are widely used for conducting connection and disconnection control on a load, and the mechanical switch can generate electric arcs when current is disconnected, so that the defects of short electrical service life and poor reliability of a mechanical contact exist.
Disclosure of Invention
The invention aims to provide an isolated arc-extinguishing device and an arc-free switch aiming at the defects of electromagnetic switches such as a contactor, a relay and the like.
The purpose of the invention is achieved by the following technical scheme:
an isolated arc-extinguishing device comprises a first electromagnetic switch, a power semiconductor device, a first semiconductor switch, a second semiconductor switch, a first semiconductor device and a control unit, wherein a mechanical contact of the first electromagnetic switch is connected with the power semiconductor device in series to form a first series circuit, the first series circuit is used for being connected with a mechanical contact of a second electromagnetic switch needing arc extinguishing in parallel, a first control coil of the first electromagnetic switch is connected with the first semiconductor switch in series to form a second series circuit, the second semiconductor switch is connected with a second control coil of the second electromagnetic switch in series to form a third series circuit, the second series circuit is connected with the third series circuit in parallel, a first semiconductor switch end of the second series circuit is connected with a second control coil end of the third series circuit, and a common end of the first control coil and the first semiconductor switch are connected, The common end of the second control coil connected with the second semiconductor switch is connected with the first semiconductor device, and the control unit is connected with the control end of the power semiconductor device, the control end of the first semiconductor switch and the control end of the second semiconductor switch.
An isolated arc extinguishing device, the first semiconductor device is a diode.
The first semiconductor switch and the second semiconductor switch are a triode or a field effect transistor.
The first semiconductor switch, the second semiconductor switch and the first semiconductor device are thyristors, and control ends of the thyristors are connected with the control unit.
The isolated arc-extinguishing device also comprises a first voltage-limiting semiconductor device and a second voltage-limiting semiconductor device, wherein the first voltage-limiting semiconductor device is connected with the first control coil in parallel or connected with the first semiconductor switch in parallel, and the second voltage-limiting semiconductor device is connected with the second control coil in parallel or connected with the second semiconductor switch in parallel.
The first electromagnetic switch and the second electromagnetic switch are in a pull-in state, the first semiconductor switch is cut off, the second semiconductor switch is cut off, the first semiconductor device is conducted, and the first control coil, the first semiconductor device and the second control coil form a series loop.
In the attraction process, the control unit controls the first semiconductor switch to be conducted, the first electromagnetic switch attracts, then controls the second semiconductor switch to be conducted, and then controls the first semiconductor switch to be cut off and the second semiconductor switch to be cut off; in the breaking process, the control unit controls the first semiconductor switch to be switched on and controls the second electromagnetic switch to be switched off firstly.
An isolated arc-extinguishing device, further comprising a first pin, a second pin, a third pin, a fourth pin and a fifth pin, the control unit, the first electromagnetic switch, the power semiconductor device, the first semiconductor switch, the second semiconductor switch, the first semiconductor device are encapsulated in an insulating material, the control unit is connected with the control end of the first semiconductor switch, the control end of the second semiconductor switch and the control end of the power semiconductor device, the internal ends of the first pin and the second pin are connected with two ends of the first series circuit, the third pin and the fourth pin are power ends, the internal ends of the third pin and the fourth pin are connected with the control unit and the second series circuit, and the internal end of the fifth pin is connected with the second semiconductor switch; the external end of the first pin and the external end of the second pin are used for being connected with a mechanical contact of the second electromagnetic switch, the external end of the third pin and the external end of the fourth pin are used for being connected with a control power supply, and the external end of the fifth pin is used for being connected with a control coil of the second electromagnetic switch.
An arcless switch comprises the isolated arc extinguishing device and the second electromagnetic switch.
The working principle is as follows: in the attracting process, the control unit controls the first semiconductor switch to be conducted, the first electromagnetic switch to attract first, then controls the second semiconductor switch to be conducted, controls the power semiconductor device to be conducted (when closed arc extinction is needed), the second electromagnetic switch attracts again to achieve the purpose of closed arc extinction of the second electromagnetic switch, then controls the first semiconductor switch to be cut off and the second semiconductor switch to be cut off, and the first electromagnetic switch and the second electromagnetic switch are in the attracting state, the first semiconductor switch is cut off, the second semiconductor switch is cut off, the first semiconductor device is conducted, the control coil of the first electromagnetic switch, the first semiconductor device and the control coil of the second electromagnetic switch form a series loop to achieve the effect of energy conservation; in the breaking process, the control unit controls the first semiconductor switch to be conducted, controls the second electromagnetic switch to be disconnected firstly, and then controls the first electromagnetic switch to be disconnected, so that the aim of non-arc breaking is fulfilled.
The isolated arc-extinguishing device and the arcless switch are reasonable in design, the drive maintaining power consumption of the original second electromagnetic switch is not increased, the maintaining power consumption of the second electromagnetic switch can be saved, and the isolated arc-extinguishing device and the arcless switch have the advantages of convenience in use, small size, low working energy consumption and low temperature rise.
Drawings
Fig. 1 is a schematic circuit diagram of an embodiment of an isolated arc extinguishing device and an arc-free switch according to the present invention.
Fig. 2 is a schematic diagram of two circuits of an embodiment of the isolated arc extinguishing device and the arcless switch of the present invention.
Detailed Description
One embodiment of the isolated arc extinguishing device and the arcless switch of the present invention is shown in fig. 1:
an isolated arc-extinguishing device comprises a first electromagnetic switch K1, a power semiconductor device TR1 (thyristor), a first semiconductor switch Q1 (triode, field effect transistor can be used), a second semiconductor switch Q2 (triode, field effect transistor can be used), a first semiconductor device D1 (diode), a control unit (A), a first voltage-limiting semiconductor device Z1 (voltage-stabilizing diode) and a second voltage-limiting semiconductor device Z2 (voltage-stabilizing diode), wherein the first voltage-limiting semiconductor device Z1 is connected with the first semiconductor switch Q1 in parallel, the second voltage-limiting semiconductor device Z2 is connected with the second semiconductor switch Q2 in parallel, a mechanical contact of the first electromagnetic switch K1 is connected with the power semiconductor device TR1 in series to form a first series circuit, the first series circuit is used for being connected with a mechanical contact of the second electromagnetic switch K2 to be extinguished in parallel, a control coil of the first electromagnetic switch K1 is connected with the first semiconductor switch Q1 in series to form a second series circuit, the second semiconductor switch Q2 is connected in series with the control coil of the second electromagnetic switch K2 to form a third series circuit, the second series circuit is connected in parallel with the third series circuit, the first semiconductor switch Q1 end of the second series circuit is connected with the control coil end of the second electromagnetic switch K2 of the third series circuit, the common end of the control coil of the first electromagnetic switch K1 connected with the first semiconductor switch Q1 and the common end of the control coil of the second electromagnetic switch K2 connected with the second semiconductor switch Q2 are connected through a first semiconductor device D1, and the control unit (a) is connected with the control end of the power semiconductor device TR1, the control end of the first semiconductor switch Q1 and the control end of the second semiconductor switch Q2.
The first voltage-limiting semiconductor device Z1 and the second voltage-limiting semiconductor device Z2 are used for absorbing overvoltage of the control coil, and respectively prevent the first semiconductor switch Q1 and the second semiconductor switch Q2 from being damaged, and can be omitted when the first semiconductor switch Q1 and the second semiconductor switch Q2 are provided with voltage limitation. The first voltage-limiting semiconductor device Z1 and the second voltage-limiting semiconductor device Z2 may also be connected in parallel with the control coil of the first electromagnetic switch K1 and the control coil of the second electromagnetic switch K2, respectively, and the first voltage-limiting semiconductor device Z1 and the second voltage-limiting semiconductor device Z2 may adopt diodes, and the working principles are the same.
The working principle is as follows: in the attracting process, the control unit (A) controls the first semiconductor switch Q1 to be switched on, the first electromagnetic switch K1 to be attracted firstly, then controls the second semiconductor switch Q2 to be switched on, controls the power semiconductor device TR1 to be switched on, and then attracts the second electromagnetic switch K2 to achieve the purpose of closing and extinguishing the arc of the second electromagnetic switch K2, and then controls the first semiconductor switch Q1 to be switched off and the second semiconductor switch Q2 to be switched off, when the first electromagnetic switch K1 and the second electromagnetic switch K2 are in the attracting state, the first semiconductor switch Q1 is switched off, the second semiconductor switch Q2 is switched off, the first semiconductor device D1 is switched on, and the control coil of the first electromagnetic switch K1, the first semiconductor device D1 and the control coil of the second electromagnetic switch K2 form a series loop, so that the energy-saving effect is achieved; in the breaking process, the control unit (A) controls the first semiconductor switch Q1 to be switched on, controls the second electromagnetic switch K2 to be switched off firstly, and then controls the first electromagnetic switch K1 to be switched off, so that the aim of non-arc breaking is fulfilled.
An arcless switch comprising the isolated arc quenching apparatus described above and further comprising a second electromagnetic switch K2.
The isolated arc-extinguishing device and the arc-free switch have the advantages of high reliability, low working energy consumption and low temperature rise.
The second embodiment of the isolated arc extinguishing device and the arcless switch of the present invention is shown in fig. 2:
an isolated arc-extinguishing device comprises a first electromagnetic switch K1, a power semiconductor device TR1 (thyristor), a first semiconductor switch Q1 (triode, field-effect tube can be adopted), a second semiconductor switch Q2 (triode, field-effect tube can be adopted), a first semiconductor device D1 (diode), a control unit (A), a first voltage-limiting semiconductor device Z1 (voltage-stabilizing diode), a second voltage-limiting semiconductor device Z2 (voltage-stabilizing diode), a first pin P1, a second pin P2, a third pin P3, a fourth pin P4 and a fifth pin P5, wherein the first voltage-limiting semiconductor device Z1 is connected with the first semiconductor switch Q1 in parallel, the second voltage-limiting semiconductor device Z2 is connected with the second semiconductor switch Q2 in parallel, a mechanical contact of the first electromagnetic switch K1 is connected with the power semiconductor device TR1 in series to form a first series circuit, and the first series circuit is connected with the first pin P1, The second pin P2 is connected in parallel with the mechanical contact of the second electromagnetic switch K2 to be arc-extinguished, the control coil of the first electromagnetic switch K1 is connected in series with the first semiconductor switch Q1 to form a second series circuit, the second semiconductor switch Q2 is connected in series with the control coil of the second electromagnetic switch K2 through the fifth pin P5 to form a third series circuit, the second series circuit is connected in parallel with the third series circuit, the first semiconductor switch Q1 end of the second series circuit is connected with the control coil end of the second electromagnetic switch K2 of the third series circuit, the common end of the control coil of the first electromagnetic switch K1 connected with the first semiconductor switch Q1, the common end of the control coil of the second electromagnetic switch K2 connected with the second semiconductor switch Q2 are connected through the first semiconductor device D1, the control unit (A) is connected with the control end of the power semiconductor device TR1, the control terminal of the first semiconductor switch Q1 and the control terminal of the second semiconductor switch Q2 are connected. The control unit (A), the first electromagnetic switch K1, the power semiconductor device TR1, the first semiconductor switch Q1, the second semiconductor switch Q2 and the first semiconductor device D1 are packaged in an insulating material, the internal end of the first pin P1 and the internal end of the second pin P2 are connected with two ends of a first series circuit, the third pin P3 and the fourth pin P4 are power supply ends, the internal end of the third pin P3 and the internal end of the fourth pin P4 are connected with the control unit (A) and a second series circuit, and the internal end of the fifth pin P5 is connected with the second semiconductor switch Q2; the external end of the first pin P1 and the external end of the second pin P2 are used for being connected with the mechanical contact of the second electromagnetic switch K2, the external end of the third pin P3 and the external end of the fourth pin P4 are used for being connected with a control power supply, and the external end of the fifth pin P5 is used for being connected with a control coil of the second electromagnetic switch K2.
The first voltage-limiting semiconductor device Z1 and the second voltage-limiting semiconductor device Z2 are used for absorbing overvoltage of the control coil, and respectively prevent the first semiconductor switch Q1 and the second semiconductor switch Q2 from being damaged, and can be omitted when the first semiconductor switch Q1 and the second semiconductor switch Q2 are provided with voltage limitation. The first voltage-limiting semiconductor device Z1 and the second voltage-limiting semiconductor device Z2 may also be connected in parallel with the control coil of the first electromagnetic switch K1 and the control coil of the second electromagnetic switch K2, respectively, and the first voltage-limiting semiconductor device Z1 and the second voltage-limiting semiconductor device Z2 may adopt diodes, and the working principles are the same.
The working principle is as follows: in the attracting process, the external end of the third pin P3 and the fourth pin P4 are input with a control power supply, the control unit (A) controls the first semiconductor switch Q1 to be switched on, the first electromagnetic switch K1 is firstly attracted, then the second semiconductor switch Q2 is controlled to be switched on, the power semiconductor device TR1 is controlled to be switched on, the second electromagnetic switch K2 is attracted again, the purpose of closing and arc extinguishing the second electromagnetic switch K2 is achieved, then the first semiconductor switch Q1 is controlled to be switched off, the second semiconductor switch Q2 is controlled to be switched off, the first electromagnetic switch K1 and the second electromagnetic switch K2 are in the attracting state, the first semiconductor switch Q1 is switched off, the second semiconductor switch Q2 is switched off, the first semiconductor device D1 is controlled to be switched on, and the control coils of the first electromagnetic switch K1, the first semiconductor device D1 and the second electromagnetic switch K2 form a series circuit, so that the energy-saving effect is achieved; in the breaking process, the control unit (A) controls the first semiconductor switch Q1 to be switched on, controls the second electromagnetic switch K2 to be switched off firstly, and then controls the first electromagnetic switch K1 to be switched off, so that the aim of non-arc breaking is fulfilled.
An arcless switch comprising the isolated arc quenching apparatus described above and further comprising a second electromagnetic switch K2.
The isolated arc-extinguishing device and the arc-free switch have the advantages of high reliability, low working energy consumption and low temperature rise.
In the above embodiment, when the first electromagnetic switch K1 and the second electromagnetic switch K2 are ac-driven, the first semiconductor switch Q1, the second semiconductor switch Q2 and the first semiconductor device D1 may adopt thyristors, and control terminals of the thyristors are connected with the control unit (a).
The embodiment has the advantages of convenience in use, low working energy consumption, low temperature rise and high reliability.
In conclusion, the invention can realize that the mechanical switch is disconnected without electric arc, and the power semiconductor device is in a disconnection and isolation state after the mechanical switch is disconnected, and has the advantages of good insulation and voltage resistance performance, low working energy consumption, low temperature rise and high reliability.
Claims (8)
1. An isolated arc-extinguishing device comprises a first electromagnetic switch, a power semiconductor device, a first semiconductor switch, a second semiconductor switch, a first semiconductor device and a control unit, wherein a mechanical contact of the first electromagnetic switch and the power semiconductor device are connected in series to form a first series circuit, the first series circuit is used for being connected in parallel with a mechanical contact of a second electromagnetic switch needing arc extinguishing, a control coil of the first electromagnetic switch and the first semiconductor switch are connected in series to form a second series circuit, the second semiconductor switch and a control coil of the second electromagnetic switch are connected in series to form a third series circuit, the second series circuit and the third series circuit are connected in parallel, and a first semiconductor switch end of the second series circuit is connected with a control coil end of the second electromagnetic switch of the third series circuit, a common end of a control coil of the first electromagnetic switch connected with the first semiconductor switch and a common end of a control coil of the second electromagnetic switch connected with the second semiconductor switch are connected through the first semiconductor device, and the control unit is connected with a control end of the power semiconductor device, a control end of the first semiconductor switch and a control end of the second semiconductor switch;
in the attraction process, the control unit controls the first semiconductor switch to be switched on, the first electromagnetic switch attracts, then controls the second semiconductor switch to be switched on, and then controls the first semiconductor switch to be switched off and the second semiconductor switch to be switched off; in the breaking process, the control unit controls the first semiconductor switch to be switched on and controls the second electromagnetic switch to be switched off firstly.
2. The isolated arc extinguishing device of claim 1, wherein: the first semiconductor device is a diode.
3. The isolated arc extinguishing apparatus of claim 2, wherein: the first semiconductor switch and the second semiconductor switch are triodes or field effect transistors.
4. The isolated arc extinguishing device of claim 1, wherein: the electromagnetic switch also comprises a first voltage-limiting semiconductor device and a second voltage-limiting semiconductor device, wherein the first voltage-limiting semiconductor device is connected with the control coil of the first electromagnetic switch in parallel or connected with the first semiconductor switch in parallel, and the second voltage-limiting semiconductor device is connected with the control coil of the second electromagnetic switch in parallel or connected with the second semiconductor switch in parallel.
5. The isolated arc extinguishing device of claim 1, wherein: the first semiconductor switch, the second semiconductor switch and the first semiconductor device are thyristors, and control ends of the thyristors are connected with the control unit.
6. The isolated arc extinguishing device of claim 1, wherein: in the attraction process, the control unit controls the first semiconductor switch to be switched on, the first electromagnetic switch attracts, then controls the second semiconductor switch to be switched on, controls the power semiconductor device to be switched on, and controls the second electromagnetic switch to attract again, and then controls the first semiconductor switch to be switched off and the second semiconductor switch to be switched off; in the breaking process, the control unit controls the first semiconductor switch to be switched on and controls the second electromagnetic switch to be switched off firstly.
7. The isolated arc extinguishing device of any of claims 1 to 6, wherein: the power semiconductor device is characterized by further comprising a first pin, a second pin, a third pin, a fourth pin and a fifth pin, wherein the control unit, the first electromagnetic switch, the power semiconductor device, the first semiconductor switch, the second semiconductor switch and the first semiconductor device are packaged in an insulating material, the control unit is connected with a control end of the first semiconductor switch, a control end of the second semiconductor switch and a control end of the power semiconductor device, an internal end of the first pin and an internal end of the second pin are connected with two ends of the first series circuit, the third pin and the fourth pin are power ends, an internal end of the third pin and an internal end of the fourth pin are connected with the control unit and the second series circuit, and an internal end of the fifth pin is connected with the second semiconductor switch; the external end of the first pin and the external end of the second pin are used for being connected with a mechanical contact of the second electromagnetic switch, the external end of the third pin and the external end of the fourth pin are used for being connected with a control power supply, and the external end of the fifth pin is used for being connected with a control coil of the second electromagnetic switch.
8. An arcless switch is characterized in that: the isolated arc extinguishing device comprises the isolated arc extinguishing device and the second electromagnetic switch, wherein the isolated arc extinguishing device is defined in any one of claims 1 to 6.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2016101691434 | 2016-03-14 | ||
| CN201610169143 | 2016-03-14 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106783396A CN106783396A (en) | 2017-05-31 |
| CN106783396B true CN106783396B (en) | 2019-12-24 |
Family
ID=58962110
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710143390.1A Active CN106783396B (en) | 2016-03-14 | 2017-03-11 | Isolated arc extinguishing device and arc-free switch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106783396B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2498807A1 (en) * | 1981-01-23 | 1982-07-30 | Socapex | Low power consumption monostable relay - has ON=OFF switch coupled to bistable relay by capacitor connected transistor pulse generator |
| CN1397971A (en) * | 2002-06-06 | 2003-02-19 | 孙守信 | Micrpower non-arc switch and control circuit |
| CN201845710U (en) * | 2010-05-29 | 2011-05-25 | 刘爱民 | Arc extinguishing circuit of AC relay |
| CN102946106A (en) * | 2012-11-27 | 2013-02-27 | 常州市宏大电气有限公司 | Silicon controlled rectifier combination switch |
| CN203150430U (en) * | 2013-01-25 | 2013-08-21 | 刘爱民 | DC contactor arc extinguishing circuit |
-
2017
- 2017-03-11 CN CN201710143390.1A patent/CN106783396B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2498807A1 (en) * | 1981-01-23 | 1982-07-30 | Socapex | Low power consumption monostable relay - has ON=OFF switch coupled to bistable relay by capacitor connected transistor pulse generator |
| CN1397971A (en) * | 2002-06-06 | 2003-02-19 | 孙守信 | Micrpower non-arc switch and control circuit |
| CN201845710U (en) * | 2010-05-29 | 2011-05-25 | 刘爱民 | Arc extinguishing circuit of AC relay |
| CN102946106A (en) * | 2012-11-27 | 2013-02-27 | 常州市宏大电气有限公司 | Silicon controlled rectifier combination switch |
| CN203150430U (en) * | 2013-01-25 | 2013-08-21 | 刘爱民 | DC contactor arc extinguishing circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106783396A (en) | 2017-05-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106716583B (en) | Direct current cutter | |
| JP2017514409A (en) | Capacitively coupled arc extinguishing circuit and device | |
| CN103208386B (en) | High-voltage direct-current circuit breaker based on double switches | |
| CN101625933B (en) | Arc-suppression circuit of alternating-current contactor | |
| WO2017016501A1 (en) | Inrush-current free switching device and control method thereof | |
| JP6442013B2 (en) | relay | |
| CN205069539U (en) | Communication circuit breaker of good reliability | |
| CN106783396B (en) | Isolated arc extinguishing device and arc-free switch | |
| CN107706055B (en) | High-voltage relay resistant to instantaneous large current impact | |
| CN103346761A (en) | Method for mechanically and synchronously operating hybrid relay and hybrid switch | |
| US11694856B2 (en) | High voltage relay resistant to instantaneous high-current impact | |
| CN101587786B (en) | Switch arc suppression circuit for switch devices and control method thereof | |
| CN110875159B (en) | Composite direct current switch capable of being physically disconnected and switching method | |
| CN209641593U (en) | A kind of contactor for preventing electric arc control unit | |
| CN107146739B (en) | Low-level self-locking control circuit of electromagnetic relay | |
| CN203746700U (en) | Contactor de-excitation device | |
| CN111668072A (en) | Contactless P-channel energy-saving relay and circuit switching method thereof | |
| CN201465837U (en) | Switch arc-suppressing circuit | |
| CN104240993B (en) | Complementary circuit arc suppression method, power expansion method and basic structure thereof | |
| CN108630505B (en) | Control circuit for switching on and off of direct current breaker | |
| CN203553035U (en) | Vacuum arc-extinguishing switch | |
| CN203839288U (en) | Control circuit for improving response speed of electromagnetic contactor | |
| CN211529866U (en) | Vacuum circuit breaker with direct-acting permanent magnet operating mechanism | |
| CN201576629U (en) | Arc suppression circuit for alternating current contactor | |
| CN210349691U (en) | Medium-voltage phase-selecting switch |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |