CN104577971A - Outage trip protection plug - Google Patents
Outage trip protection plug Download PDFInfo
- Publication number
- CN104577971A CN104577971A CN201410827258.9A CN201410827258A CN104577971A CN 104577971 A CN104577971 A CN 104577971A CN 201410827258 A CN201410827258 A CN 201410827258A CN 104577971 A CN104577971 A CN 104577971A
- Authority
- CN
- China
- Prior art keywords
- diode
- circuit
- ground wire
- protection
- electric capacity
- 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.)
- Granted
Links
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses an outage trip protection plug. The outage trip protection plug comprises an amplification circuit, a release, an overtemperature detection circuit, a rectifier diode, a power indicator light circuit, a voltage reduction circuit, a silicon controlled rectifier, a zero sequence current transformer, a ground wire current transformer and an open-phase protection circuit, wherein the open-phase protection circuit comprises an electromagnetic coil of the release, an anti-countercurrent diode, an energy storage capacitor, a first diode and a protection diode; an anode of the energy storage capacitor is connected with the anti-countercurrent diode and the electromagnetic coil; a cathode of the protection diode is connected with the anode of the energy storage capacitor; an anode of the protection diode is connected with the other end of the electromagnetic coil; and the first diode is connected between the silicon controlled rectifier and the electromagnetic coil. With the adoption of the outage trip protection plug, open-phase protection for poor L-phase, N-phase and E-phase contact, ground wire open-circuit protection and wall charged protection are realized.
Description
Technical field
The present invention relates to Electrical Safety resist technology field, especially relate to power-off trip protection plug.
Background technology
Existing electric leakage protection technology is zero line (N) mainly, phase line (L) is entirely made earth leakage protective device through zero-sequence mutual inductance line simultaneously and is used, and ground wire electrified detection (voltage detecting and current detecting), this type of technology is all based upon supply voltage the basis of continued power must can provide corresponding defencive function, if when just meeting ground wire electrification or machine insulation appearance exception when zero-line open-circuit or the loose contact of electric power system, protector parting system causes the dropout that cannot reset because of mechanical self-latching, ground wire electrification voltage or make machine charged because of the leakage current of insulation damages, if cause electric shock behavior after human body touches, for solving this type of abnormal electrical power supply phenomenon, market also there is power-off trip protection device, because this type of protector is, by electric power system, solenoid is continued adhesive, the tripping mechanism closing of contact is made to reach continued power object, when electric power system power-off or phase shortage, solenoid because of cannot adhesive cause protector cannot powering load to reach protection philosophy, the drawback of this protected mode is: solenoid continued power causes coil heating, long-time serious warming-up effect protector useful life and there is potential safety hazard, under extreme condition, protector will lose defencive function and cause serious consequence.
Summary of the invention
(1) technical problem that will solve
Object of the present invention will overcome above-mentioned shortcoming exactly, aims to provide a kind of power-off trip protection plug.
(2) technical scheme
For solving the problem, the present invention proposes a kind of power-off trip protection plug, comprise amplifying circuit, release, overtemperature testing circuit, rectifier diode, power supply indicator circuit, reduction voltage circuit, controllable silicon, zero sequence current mutual inductor and ground line current instrument transformer, be also provided with open-phase protection circuit;
Described open-phase protection circuit comprises solenoid, counterflow-preventing diode, storage capacitor, first diode of release and protects diode, described storage capacitor positive pole connects counterflow-preventing diode and solenoid, described protection diode cathode connects storage capacitor positive pole, protection diode cathode connects the other end of solenoid, and described first diode is connected between controllable silicon and solenoid;
Body of wall and ground wire protective circuit is also provided with between ground wire and body of wall.
Further; described body of wall and ground wire protective circuit comprise the first electric capacity, the second electric capacity, the second diode, triode and the first protective resistance; described first electric capacity one end connects ground wire, the other end connects the second diode cathode and the second electric capacity; the other end connecting wall of described second electric capacity, the negative pole of described second diode passes through the base stage of the first protective resistance connecting triode.
Further; described body of wall and ground wire protective circuit comprise the 3rd electric capacity, the 4th electric capacity, ground wire voltage instrument transformer and change over switch; described 3rd electric capacity one end connecting wall; the other end connects one end and the ground wire voltage primary winding of mutual inductor of the 4th electric capacity; the other end of described 4th electric capacity connects ground wire, and described ground wire voltage instrument transformer and ground line current instrument transformer are switched mutually by change over switch.
Further, ground wire electrification indicating circuit is provided with between described ground wire and zero line.
Further, the primary coil of described zero sequence current mutual inductor is also provided with test circuit.
(3) beneficial effect
Compared with prior art, the present invention has the following advantages: 1 open-phase protection (contacting containing L, N, E bad), protector under "on" position, during because of L or N end power failure or loose contact, detection transistor Q3 ends, and electric capacity C5 tank voltage is through resistance R12, diode D6 is to controllable silicon SCR 1 conducting, solenoid adhesive, mechanical self-latching contact discharges, and cuts off load supplying; 2 open-circuit-protections, under "on" position, during earth connection E, Eo end open circuit, the induced voltage on E line is through electric capacity C4, diode D3, resistance R6, triode Q2, triode Q1, diode D7 is to controllable silicon SCR 1, controlled silicon conducting, solenoid adhesive, mechanical self-latching contact discharges, and cuts off load supplying; 3 body of wall electrization protection "on" positions, E end is no ground, and earth connection Ee holds or Eo end band electricity, and deliver to resistance D7 after charged electric current amplifies after testing, SCR1 controlled silicon conducting, solenoid adhesive, mechanical self-latching contact discharges, and cuts off load supplying.
Accompanying drawing explanation
Fig. 1 is the circuit theory schematic diagram of the embodiment one of power-off trip protection plug of the present invention;
Fig. 2 is the circuit theory schematic diagram of the embodiment two of power-off trip protection plug of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples for illustration of the present invention, but are not used for limiting the scope of the invention.
Embodiment one
As shown in Figure 1, the present invention proposes a kind of power-off trip protection plug, comprise amplifying circuit IC1, release, overtemperature testing circuit, rectifier diode D1, power supply indicator circuit, reduction voltage circuit be made up of resistance R4, controllable silicon SCR 1, zero sequence current mutual inductor ZCT1 and ground line current instrument transformer ZCT3, wherein, Overtemperature protection circuit is made up of to resistance R9 and thermistor voltage-reference, triode Q1, resistance R7, power supply indicator circuit is composed in series by LED1 and resistance R3, is also provided with open-phase protection circuit;
Described open-phase protection circuit comprises solenoid L1, counterflow-preventing diode D4, storage capacitor C5, the first diode D6 of release and protects diode D5, described storage capacitor C5 positive pole connects counterflow-preventing diode D4 and solenoid L1, described protection diode D5 negative pole connects storage capacitor C5 positive pole, protection diode D5 positive pole connects the other end of solenoid L1, and described first diode D6 is connected between controllable silicon SCR 1 and solenoid L1;
Body of wall and ground wire protective circuit is also provided with between ground wire E and body of wall Ee.
Described body of wall and ground wire protective circuit comprise the first electric capacity C4, the second electric capacity C3, the second diode D3, triode Q2 and the first protective resistance R6; described first electric capacity C4 one end connects ground wire E, the other end connects the second diode D3 positive pole and the second electric capacity C3; the negative pole of the other end connecting wall Ee of described second electric capacity C3, described second diode D3 passes through the base stage of the first protective resistance R6 connecting triode Q2.
Be provided with ground wire electrification indicating circuit between described ground wire E and zero line N, this ground wire electrification indicating circuit is made up of electric capacity C1, resistance R1, neon lamp X1.
The primary coil of described zero sequence current mutual inductor ZCT1 is also provided with test circuit, and this electric routing switch K1, resistance R2 form.
The operation principle of this circuit is as follows:
1 load zero, phase line earth leakage protective
After protector plug access 220V input power, pressure presses return unit switch S 1, S2 closes, work indication LED 1 is lighted, supply voltage is through D1 rectification, D4 reverse isolation is to the charging of C5 capacitor, and C5 terminal voltage is supplied to controllable silicon SCR 1 after protection coil L1, and controllable silicon obtains electricity and is in protection detected state; Meanwhile, electric current is through resistance R4 current limliting, and C2 capacitor filtering is powered to IC1, and protector obtains electricity work (this process hereinafter referred: protector obtains electricity work); When load end (output) Lo or No arbitrary end exports electric leakage, mutual inductor ZCT1 exports induced voltage, 1 and 2 pin that IC1 detects drive circuit are sent in one end after ZCT3, and when leakage current reaches preset value, 7 pin export high level through D2, D7 is to control machines pole, controlled silicon conducting, C5 terminal voltage is applied to L1 solenoid two ends instantaneously, and coil adhesive drives tripping mechanism to make closing contact (S2, S1) disconnect, cut off the effect that load power source plays safeguard protection;
2 earth wire charged protectings (E end)
Protector obtains electricity work, ground wire electrification electric current flows out Eo end through E, and its induction coil ZCT3 be through on E line exports induced voltage, and 1 and 2 pin of IC1 are delivered on a road respectively after ZCT1, when leakage current reaches preset value, 7 pin of IC1 export high level and deliver to SCR1 trigger electrode through D2, D7, controlled silicon conducting, C5 terminal voltage is applied to L1 solenoid two ends instantaneously, coil adhesive drives tripping mechanism that closing contact (S2, S1) is disconnected, and cuts off the effect that load power source plays safeguard protection;
3 open-phase protections (L or N phase shortage)
Protector obtains electricity work, when L or N that power holds open circuit or loose contact (containing AC220V input interruption of power supply), C2 terminal voltage is not enough to maintain Q3 conducting, and after Q3 cut-off, C5 terminal voltage is through R12, D6 delivers to SCR1 trigger electrode, controlled silicon conducting, C5 terminal voltage is applied to L1 solenoid two ends instantaneously, and coil adhesive drives tripping mechanism to make closing contact (S2, S1) disconnect, cut off the effect that load power source plays safeguard protection;
4 open-phase protections (E, Eo phase shortage)
Protector obtains electricity work, when E and Eo end of powering is opened a way, E end will exist induced voltage, this voltage is through C4, D3, R6 deliver to Q2 and conducting, the controlled conducting of Q1, supply voltage is delivered to after D7 through Q1 and is triggered SCR1, controlled silicon conducting, C5 terminal voltage is applied to L1 solenoid two ends instantaneously, and coil adhesive drives tripping mechanism to make closing contact (S2, S1) disconnect, cut off the effect that load power source plays safeguard protection;
5 body of wall electrization protections (Ee end)
Protector obtains electricity work, and input x1 wire jumper is predisposed to open-circuit condition, x2 short circuit state, body of wall electrified voltage Ee is through C3, D3, R6 deliver to Q2 and conducting, the controlled conducting of Q1, supply voltage is delivered to after D7 through Q1 and is triggered SCR1, controlled silicon conducting, C5 terminal voltage is applied to L1 solenoid two ends instantaneously, and coil adhesive drives tripping mechanism to make closing contact (S2, S1) disconnect, cut off effect that load power source plays safeguard protection simultaneously charged warning lamp X1 light;
6 protector plug overtemperature protes
Protector obtains electricity work; when overtemperature protection device detects that protector plug temperature reaches preset temperature; C2 voltage delivers to U1 through R9, RT1, and the conducting of the U1 degree of depth causes Q1 conducting; On current triggers SCR1 after D7; controlled silicon conducting, C5 terminal voltage is applied to L1 solenoid two ends instantaneously, and coil adhesive drives tripping mechanism to make closing contact (S2; S1) disconnect, cut off the effect that load power source plays safeguard protection.
The present invention has the following advantages: 1 open-phase protection is (containing L, N, E contacts bad), the protector under "on" position, during because of L or N end power failure or loose contact, detection transistor Q3 ends, electric capacity C5 tank voltage through resistance R12, diode D6 to controllable silicon SCR 1 conducting, solenoid adhesive, mechanical self-latching contact discharges, and cuts off load supplying; 2 open-circuit-protections, under "on" position, during earth connection E, Eo end open circuit, the induced voltage on E line is through electric capacity C4, diode D3, resistance R6, triode Q2, triode Q1, diode D7 is to controllable silicon SCR 1, controlled silicon conducting, solenoid adhesive, mechanical self-latching contact discharges, and cuts off load supplying; 3 body of wall electrization protection "on" positions, E end is no ground, and earth connection Ee holds or Eo end band electricity, and deliver to resistance D7 after charged electric current amplifies after testing, SCR1 controlled silicon conducting, solenoid adhesive, mechanical self-latching contact discharges, and cuts off load supplying.
Embodiment two
The present embodiment is substantially identical with the structure of embodiment one; difference is as shown in Figure 2: described body of wall and ground wire protective circuit comprise the 3rd electric capacity C3, the 4th electric capacity C4, ground wire voltage instrument transformer ZCT2 and change over switch S3; described 3rd electric capacity C3 one end connecting wall Ee; the other end connects one end and the ground wire voltage instrument transformer ZCT2 primary coil of the 4th electric capacity C4; the other end of described 4th electric capacity C4 connects ground wire E, and described ground wire voltage instrument transformer ZCT2 and ground line current instrument transformer ZCT3 is switched mutually by change over switch S3.Open-phase protection (L or the N phase shortage) process of the present embodiment is as follows: protector obtains electricity work; when L or N that power holds open circuit or loose contact (containing AC220V input interruption of power supply); C2 terminal voltage is not enough to maintain Q3 conducting; after Q3 cut-off; C5 terminal voltage is through R12; D6 delivers to SCR1 trigger electrode; controlled silicon conducting; C5 terminal voltage is applied to L1 solenoid two ends instantaneously; coil adhesive drives tripping mechanism to make closing contact (S2; S1) disconnect, cut off the effect that load power source plays safeguard protection.Open-phase protection (E; Eo phase shortage) following protector obtains electricity work; when E and Eo end of powering is opened a way; induced voltage will be there is in E end; this voltage is through C4; ZCT2; R5 and N end forms loop, and ZCT2 responds to 1 and 2 pin that output voltage sends into IC1 after S3 diverter switch and ZCT1, amplifies 7 pin after process export high level through IC1; deliver to after D7 through D2 and trigger SCR1; controlled silicon conducting, C5 terminal voltage is applied to L1 solenoid two ends instantaneously, and coil adhesive drives tripping mechanism to make closing contact (S2; S1) disconnect, cut off the effect that load power source plays safeguard protection.
Below be only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the technology of the present invention principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (5)
1. a power-off trip protection plug, comprise amplifying circuit, release, overtemperature testing circuit, rectifier diode, power supply indicator circuit, reduction voltage circuit, controllable silicon, zero sequence current mutual inductor and ground line current instrument transformer, it is characterized in that: be also provided with open-phase protection circuit;
Described open-phase protection circuit comprises solenoid, counterflow-preventing diode, storage capacitor, first diode of release and protects diode, described storage capacitor positive pole connects counterflow-preventing diode and solenoid, described protection diode cathode connects storage capacitor positive pole, protection diode cathode connects the other end of solenoid, and described first diode is connected between controllable silicon and solenoid;
Body of wall and ground wire protective circuit is also provided with between ground wire and body of wall.
2. power-off trip protection plug according to claim 1; it is characterized in that: described body of wall and ground wire protective circuit comprise the first electric capacity, the second electric capacity, the second diode, triode and the first protective resistance; described first electric capacity one end connects ground wire, the other end connects the second diode cathode and the second electric capacity; the other end connecting wall of described second electric capacity, the negative pole of described second diode passes through the base stage of the first protective resistance connecting triode.
3. power-off trip protection plug according to claim 1; it is characterized in that: described body of wall and ground wire protective circuit comprise the 3rd electric capacity, the 4th electric capacity, ground wire voltage instrument transformer and change over switch; described 3rd electric capacity one end connecting wall; the other end connects one end and the ground wire voltage primary winding of mutual inductor of the 4th electric capacity; the other end of described 4th electric capacity connects ground wire, and described ground wire voltage instrument transformer and ground line current instrument transformer are switched mutually by change over switch.
4. power-off trip protection plug according to claim 1 and 2, is characterized in that: be provided with ground wire electrification indicating circuit between described ground wire and zero line.
5. power-off trip protection plug according to claim 4, is characterized in that: the primary coil of described zero sequence current mutual inductor is also provided with test circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410827258.9A CN104577971B (en) | 2014-12-26 | 2014-12-26 | Power off trip protection plug |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410827258.9A CN104577971B (en) | 2014-12-26 | 2014-12-26 | Power off trip protection plug |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104577971A true CN104577971A (en) | 2015-04-29 |
| CN104577971B CN104577971B (en) | 2017-11-14 |
Family
ID=53093448
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410827258.9A Active CN104577971B (en) | 2014-12-26 | 2014-12-26 | Power off trip protection plug |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104577971B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104917147A (en) * | 2015-05-25 | 2015-09-16 | 余姚市嘉荣电子电器有限公司 | EN voltage-dividing and sampling type leakage protector |
| CN104979798A (en) * | 2015-05-04 | 2015-10-14 | 余姚市嘉荣电子电器有限公司 | Automatic identification omnibearing protection leakage protector device |
| CN105207171A (en) * | 2015-09-21 | 2015-12-30 | 余姚市嘉荣电子电器有限公司 | Automatic power-on and power-off control circuit for electric leakage protector |
| CN107732862A (en) * | 2017-10-20 | 2018-02-23 | 杨蔚星 | A kind of automatically controlled protection switch of three-phase and four-line all direction multifunctional accident |
| TWI619360B (en) * | 2016-11-10 | 2018-03-21 | 美律實業股份有限公司 | Near field communication apparatus and wireless induction circuit thereof |
| CN112865015A (en) * | 2021-03-25 | 2021-05-28 | 浙江深华颖智能科技有限公司 | Sensor with high-voltage zero-sequence protection and measurement functions |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2120385U (en) * | 1992-05-23 | 1992-10-28 | 潘阔海 | Air switch with break and open-phase protection |
| CN201004548Y (en) * | 2006-08-15 | 2008-01-09 | 陈成南 | Current leakage protector with zero line breaking protection |
| CN101442199A (en) * | 2008-09-05 | 2009-05-27 | 上海良信电器股份有限公司 | Electronic breaker |
| CN203056535U (en) * | 2013-02-07 | 2013-07-10 | 浙江南瑞电力自动化有限公司 | Passive microcomputer protection device |
| CN103872643A (en) * | 2014-03-18 | 2014-06-18 | 广州市博达电子科技有限公司 | Anti electric wall circuit for leakage protection switch and application of the same |
| CN203690888U (en) * | 2014-02-20 | 2014-07-02 | 余姚市嘉荣电子电器有限公司 | Electric leakage protection plug |
| CN204349419U (en) * | 2014-12-26 | 2015-05-20 | 余姚市嘉荣电子电器有限公司 | Power-off trip protection plug |
-
2014
- 2014-12-26 CN CN201410827258.9A patent/CN104577971B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2120385U (en) * | 1992-05-23 | 1992-10-28 | 潘阔海 | Air switch with break and open-phase protection |
| CN201004548Y (en) * | 2006-08-15 | 2008-01-09 | 陈成南 | Current leakage protector with zero line breaking protection |
| CN101442199A (en) * | 2008-09-05 | 2009-05-27 | 上海良信电器股份有限公司 | Electronic breaker |
| CN203056535U (en) * | 2013-02-07 | 2013-07-10 | 浙江南瑞电力自动化有限公司 | Passive microcomputer protection device |
| CN203690888U (en) * | 2014-02-20 | 2014-07-02 | 余姚市嘉荣电子电器有限公司 | Electric leakage protection plug |
| CN103872643A (en) * | 2014-03-18 | 2014-06-18 | 广州市博达电子科技有限公司 | Anti electric wall circuit for leakage protection switch and application of the same |
| CN204349419U (en) * | 2014-12-26 | 2015-05-20 | 余姚市嘉荣电子电器有限公司 | Power-off trip protection plug |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104979798A (en) * | 2015-05-04 | 2015-10-14 | 余姚市嘉荣电子电器有限公司 | Automatic identification omnibearing protection leakage protector device |
| CN104979798B (en) * | 2015-05-04 | 2017-11-03 | 余姚市嘉荣电子电器有限公司 | Automatic identification omnibearing protection earth leakage protective device device |
| CN104917147A (en) * | 2015-05-25 | 2015-09-16 | 余姚市嘉荣电子电器有限公司 | EN voltage-dividing and sampling type leakage protector |
| CN104917147B (en) * | 2015-05-25 | 2018-04-13 | 余姚市嘉荣电子电器有限公司 | Ground wire zero curve partial pressure sampling type earth leakage protective device |
| CN105207171A (en) * | 2015-09-21 | 2015-12-30 | 余姚市嘉荣电子电器有限公司 | Automatic power-on and power-off control circuit for electric leakage protector |
| CN105207171B (en) * | 2015-09-21 | 2018-02-06 | 余姚市嘉荣电子电器有限公司 | Earth leakage protective device powers on/off control circuit automatically |
| TWI619360B (en) * | 2016-11-10 | 2018-03-21 | 美律實業股份有限公司 | Near field communication apparatus and wireless induction circuit thereof |
| CN107732862A (en) * | 2017-10-20 | 2018-02-23 | 杨蔚星 | A kind of automatically controlled protection switch of three-phase and four-line all direction multifunctional accident |
| CN107732862B (en) * | 2017-10-20 | 2024-04-19 | 杨蔚星 | Three-phase four-wire omnibearing multifunctional accident electric control protection switch |
| CN112865015A (en) * | 2021-03-25 | 2021-05-28 | 浙江深华颖智能科技有限公司 | Sensor with high-voltage zero-sequence protection and measurement functions |
| CN112865015B (en) * | 2021-03-25 | 2022-06-24 | 江苏舒茨测控设备股份有限公司 | Sensor with high-voltage zero-sequence protection and measurement functions |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104577971B (en) | 2017-11-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104577971A (en) | Outage trip protection plug | |
| CN104577977A (en) | Voltage and current switchable type electric leakage protection device | |
| CN103579992B (en) | Voltage type leakage protection power line over-current protection device for electric heater | |
| CN104868443A (en) | Automatic power-on intelligent-type electric leakage protector | |
| CN202940564U (en) | Three-phase leakage circuit breaker | |
| CN104767173A (en) | IC-free optical-coupler detection ground wire voltage abnormity electricity leakage protection device | |
| CN105490101B (en) | Has the protection plug of power-off tripping and superpressure trip avoidance function | |
| CN204967236U (en) | Leakage protector | |
| CN202817702U (en) | Current leakage protection device | |
| CN204349419U (en) | Power-off trip protection plug | |
| CN203536652U (en) | Electric leakage protection plug with overtemperature detection | |
| CN204578063U (en) | The abnormal earth leakage protective device of ground wire voltage is detected without IC optocoupler | |
| CN204441633U (en) | Possesses the protection plug of power-off tripping operation and superpressure trip avoidance function | |
| CN103887660A (en) | Earth leakage protection plug capable of being switched between three-pole mode and two-pole mode | |
| CN206517038U (en) | Leakage protection circuit with ground wire grounded resistance detection function | |
| CN204441856U (en) | Electric current and voltage switching earth leakage protective device | |
| CN205029317U (en) | Electric electrical shutoff control circuit in earth -leakage protector automation | |
| CN205195233U (en) | Power leakage protector | |
| CN204927704U (en) | Convertible ground wire protected mode's leakage protection plug | |
| CN201163720Y (en) | Multi-use household electrical appliance protector capable of automatic trip when power-on after power-off | |
| CN205489453U (en) | Leakage protective circuit | |
| CN204205558U (en) | With the leakage protecting plug that ground wire high voltage detects | |
| CN203180491U (en) | Electric leakage protection device | |
| CN203326559U (en) | Electric leakage protection plug circuit | |
| CN206412751U (en) | The control circuit of earth leakage protective device with overvoltage protection |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |