CN105024240A - Earth leakage protection plug capable of converting ground wire protection modes - Google Patents
Earth leakage protection plug capable of converting ground wire protection modes Download PDFInfo
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- CN105024240A CN105024240A CN201510479997.8A CN201510479997A CN105024240A CN 105024240 A CN105024240 A CN 105024240A CN 201510479997 A CN201510479997 A CN 201510479997A CN 105024240 A CN105024240 A CN 105024240A
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Abstract
The invention provides an earth leakage protection plug capable of converting ground wire protection modes. The earth leakage protection plug is composed of a shell, a bolt, phase, null and earth lines, a zero sequence current transformer, a test loop, an electromagnetic tripping and latching device, an earth line fault current detection circuit, an earth line voltage detection circuit, first and second change-over switches and a one-way on circuit; the output end of the secondary winding of the zero sequence current transformer is connected with the first and second input ends of an amplifying circuit; the output end of the one-way on circuit is connected with the third latch input end of the amplifying circuit; the trigger output end of the amplifying circuit is connected with the control electrode of a thyristor; the output end of the secondary winding of an earth line live detection sensor is connected with the first and second input ends of the amplifying circuit by use of the second change-over switch and a sixth resistor. The earth leakage protection plug is capable of converting and selecting an earth line fault current protection mode and the earth line fault voltage protection mode, and therefore, the wrong tripping problem of the earth leakage protection plug is solved and safer electricity utilization of people is ensured.
Description
Technical field
The present invention relates to Electrical Safety resist technology field, especially relate to a kind of leakage protecting plug changing ground wire protected mode.
Background technology
Existing leakage protecting plug is by ground wire fault current detection being divided into protect to the detection protected mode of ground wire electrification and ground wire false voltage detection protection two series products.
Chinese patent literature CN1142618C discloses a kind of leakage protecting plug that can detect ground wire fault current; on this leakage protecting plug when protection system to earth exception causes ground wire accident charged; ground wire can be detected and have non-faulty current; when ground wire fault current reaches preset threshold values, it action immediately can cut off phase line, zero line and ground wire.It can thus be appreciated that; as long as this leakage protecting plug ground wire fault current reaches predetermined threshold values; leakage protecting plug will trip and with ground wire with false voltage height irrelevant; therefore; this leakage protecting plug occurs causing leakage protecting plug mistrip when being greater than predetermined threshold values fault current when ground wire false voltage is lower but because of ground wire, causes people normally to use.
Chinese patent literature CN202142735U also discloses a kind of leakage protecting plug, and this leakage protecting plug will automatic trip and haveing nothing to do with the size of ground wire fault current when the abnormal and ground wire false voltage of grounding system reaches predetermined threshold values.Therefore, this leakage protecting plug the false voltage that ground wire exists be greater than reservation threshold induced voltage but flow through the fault current of ground wire very faint time also can cause this leakage protecting plug mistrip, cause people normally to use.
For this reason, in the urgent need to a kind of ground wire electrification solution that can adapt to various power utilization environment on electric heater market, thus minimizing after-sales service probability can be reached.
Summary of the invention
The object of the present invention is to provide a kind of leakage protecting plug changing ground wire protected mode; this leakage protecting plug can not only detect ground wire fault current and ground wire false voltage; selectivity conversion can also be carried out to the electrization protection function of ground wire detection failure electric current and detection failure voltage; thus the problem both solved because mistrip causes leakage protecting plug to use, after-sales service rate and maintenance cost can be reduced again.
Technical solution proposed by the invention is such:
A kind of leakage protecting plug changing ground wire protected mode, include shell, latch, 1st phase line and the 2nd phase line, 1st zero line and the 2nd zero line, 1st ground wire and the 2nd ground wire, the zero sequence current mutual inductor that described 2nd phase line and the 2nd zero line all pass, the ground wire electrified detection inductor that described 2nd ground wire passes, test loop, electromagnetic trip and locker, this electromagnetic trip and locker are by solenoid and drive circuit thereof, phase line switch contacts, zero line switch contacts, ground wire switch contacts forms, the drive circuit of described solenoid is primarily of the 1st rectification circuit, controllable silicon, 1st resistance, amplifying circuit forms, also be provided with ground wire false voltage testing circuit, 1st change over switch, 2nd change over switch, one-way conduction circuit, described ground wire false voltage testing circuit is provided with the 1st electric capacity, 2nd rectification circuit, 3rd Resistor-Capacitor Unit, photoelectrical coupler, 4th resistance, 1st triode, 5th resistance, 1st resistance one end and the 1st rectification circuit DC output end positive pole, controllable silicon anode connects, the power end of the 1st resistance other end and amplifying circuit, 3rd foot of the 1st change over switch connects, the ground end of amplifying circuit, controllable silicon negative electrode is connected with the 1st rectification circuit DC output end negative pole, the trigger output end of amplifying circuit is connected with SCR control pole, one output of described zero sequence current mutual inductor secondary winding, one output of described ground wire electrified detection inductor secondary winding is connected with the 2nd input of described amplifying circuit, another output of described zero sequence current mutual inductor secondary winding is connected with the 1st input of described amplifying circuit, described another output of ground wire electrified detection inductor secondary winding is connected with the 3rd foot of the 2nd change over switch, be connected with the 1st input of amplifying circuit after 1st foot series connection the 6th resistance of the 2nd change over switch, by described 1st electric capacity, the ac input end of the 2nd rectification circuit, the loop that 3rd Resistor-Capacitor Unit is in series successively is connected between the 1st described ground wire and the 1st zero line, the DC output end of the 2nd rectification circuit and the input of photoelectrical coupler are connected in parallel, photoelectrical coupler one output, 1st transistor collector is connected with the 2nd foot of the 1st change over switch, another output of photoelectrical coupler and the 4th resistance one end, 1st transistor base connects, 1st transistor emitter is connected with the 5th resistance one end, the 5th resistance other end, the 4th resistance other end is connected with the 1st rectification circuit DC output end negative pole, the input of one-way conduction circuit and the 1st transistor emitter, 5th resistance one end connects, the output of one-way conduction circuit is connected with the 3rd latch input terminal of amplifying circuit, described 1st change over switch and described 2nd change over switch link and open or close.
The 2nd resistance and light-emitting diode can also be provided with; 2nd resistance one end is connected with the 2nd foot of the 1st change over switch, and the 2nd resistance other end is connected with light-emitting diode positive pole, and light-emitting diode negative pole is connected with the 1st rectification circuit DC output end negative pole.
On described 1st change over switch and the integrated drain pan being arranged on described shell of the 2nd change over switch.
Described light-emitting diode is arranged on the face-piece of described shell.
Described one-way conduction circuit is made up of the 1st diode.
Described one-way conduction circuit can also be made up of the 2nd triode.
Described 3rd Resistor-Capacitor Unit is made up of resistance.
Described 3rd Resistor-Capacitor Unit can also be made up of electric capacity.
Described 3rd Resistor-Capacitor Unit also can be made up of the assembly of resistance and electric capacity.
Compared with prior art, the present invention has following remarkable result:
(1) leakage protecting plug of the present invention can detect the fault current that ground wire occurs; once the fault current that ground wire surprisingly occurs reaches predetermined threshold values; it just can immediately phase, zero, the switch contacts of ground wire all disconnects, so the present invention provides a kind of safer Electrical Safety guarantee than existing leakage protecting plug.
(2) leakage protecting plug of the present invention also can detect the false voltage that ground wire occurs; the false voltage surprisingly occurred once ground wire reaches predetermined threshold values; before people get an electric shock; it just can immediately phase, zero, the switch contacts of ground wire all disconnects, so the present invention provides a kind of safer Electrical Safety guarantee than existing leakage protecting plug.
(3) leakage protecting plug of the present invention is by the electrization protection function of change over switch selection to ground wire; so just can select suitable earth wire charged protecting function for concrete power utilization environment; both solved the problem of existing leakage protecting plug mistrip, and be convenient to again product after-sales service and reduce product after-sales service cost.
(4) the shared amplifying circuit of signal that the zero sequence current mutual inductor secondary winding of leakage protecting plug of the present invention exports signal and ground wire electrified detection inductor secondary winding export, reduces cost.
Leakage protecting plug of the present invention is mainly used in the earth leakage protective of various household electrical appliance, mainly makes a kind of power line changing the leakage protecting plug of ground wire protected mode of band.
Accompanying drawing explanation
Fig. 1 is a kind of circuit diagram changing the leakage protecting plug of ground wire protected mode of one embodiment of the invention.
Fig. 2 is the another kind of replacement circuit schematic diagram of the one-way conduction circuit 30 shown in Fig. 1.
Embodiment
By embodiment below, the present invention is further elaborated.
Shown in Figure 1; a leakage protecting plug for ground wire protected mode can be changed, include the zero sequence current mutual inductor 17 that shell, latch, the 1st phase line 1 and the 2nd phase line 4, the 1st zero line 2 and the 2nd zero line 5, the 1st ground wire 3 and the 2nd ground wire 6, described 2nd phase line 4 and the 2nd zero line 5 all pass, ground wire electrified detection inductor 18 that described 2nd ground wire 6 passes, test loop 12, electromagnetic trip and locker.This electromagnetic trip and locker are made up of solenoid 13 and drive circuit thereof, phase line switch contacts 7, zero line switch contacts 8, ground wire switch contacts 9.The drive circuit of described solenoid 13 forms primarily of the 1st rectification circuit 14, controllable silicon 15, the 1st resistance 10, amplifying circuit 16.Also be provided with ground wire false voltage testing circuit, the 1st change over switch 26-1, the 2nd change over switch 26-2, one-way conduction circuit 30.Described ground wire false voltage testing circuit is provided with the 1st electric capacity 19, the 2nd rectification circuit 20, the 3rd Resistor-Capacitor Unit 21, photoelectrical coupler 22, the 4th resistance 23, the 1st triode 24, the 5th resistance 25.1st resistance 10 one end and the 1st rectification circuit 14 DC output end positive pole, controllable silicon 15 anode connects, the power end Vs1 of the 1st resistance 10 other end and amplifying circuit 16, the 3rd foot 26-1-3 of the 1st change over switch 26-1 connects, the ground end GND1 of amplifying circuit 16, controllable silicon 15 negative electrode is connected with the 1st rectification circuit 14 DC output end negative pole, the trigger output end 16-4 of amplifying circuit 16 controls pole with controllable silicon 15 and is connected, one output of described zero sequence current mutual inductor 17 secondary winding, one output of described ground wire electrified detection inductor 18 secondary winding is connected with the 2nd input 16-2 of described amplifying circuit 16, another output of described zero sequence current mutual inductor 17 secondary winding is connected with the 1st input 16-1 of described amplifying circuit 16, described another output of ground wire electrified detection inductor 18 secondary winding is connected with the 3rd foot 26-2-3 of the 2nd change over switch 26-2, the 1st foot 26-2-1 of the 2nd change over switch 26-2 is connected with the 1st input 16-1 of amplifying circuit 16 by the 6th resistance 27.By described 1st electric capacity 19, the ac input end of the 2nd rectification circuit 20, the loop that 3rd Resistor-Capacitor Unit 21 is in series successively is connected between the 1st described ground wire 3 and the 1st zero line 2, the DC output end of the 2nd rectification circuit 20 and the input of photoelectrical coupler 22 are connected in parallel, photoelectrical coupler 22 1 output, 1st triode 24 collector electrode is connected with the 2nd foot 26-1-2 of the 1st change over switch 26-1, another output of photoelectrical coupler 22 and the 4th resistance 23 one end, the base stage of the 1st triode 24 connects, 1st triode 24 emitter is connected with the 5th resistance 25 one end, 5th resistance 25 other end, 4th resistance 23 other end is connected with the 1st rectification circuit 14 DC output end negative pole, the input Vi1 of one-way conduction circuit 30 and the 1st triode 24 emitter, 5th resistance 25 one end connects, the output end vo 1 of one-way conduction circuit 30 is connected with amplifying circuit 16 the 3rd latch input terminal 16-3.Described 1st change over switch 26-1 and described 2nd change over switch 26-2 links and opens or closes.
The present invention can also be equipped with the 2nd resistance 29 and light-emitting diode 28, as shown in Figure 1,2nd resistance 29 one end is connected with the 2nd foot 26-1-2 of the 1st change over switch 26-1,2nd resistance 29 other end is connected with light-emitting diode 28 positive pole, and light-emitting diode 28 negative pole is connected with the 1st rectification circuit 14 DC output end negative pole.Described light-emitting diode 28 is arranged on the face-piece of described shell.
In the present embodiment, on described 1st change over switch 26-1 and the integrated drain pan being arranged on described shell of the 2nd change over switch 26-2
In the present embodiment, one-way conduction circuit 30 is made up of the 1st diode 30-1.As shown in Figure 2, one-way conduction circuit 30 can also select the 2nd triode 30-2 to form, now, the base stage of the 2nd triode 30-2 is connected with the input Vi1 of one-way conduction circuit 30, the emitter of the 2nd triode 30-2 is connected with the output end vo 1 of one-way conduction circuit 30, and the collector electrode of the 2nd triode 30-2 is connected with the 2nd foot 26-1-2 of the 1st change over switch 26-1.
In the present embodiment, described 3rd Resistor-Capacitor Unit 21 is made up of resistance, can also select and form by electric capacity or by the assembly of resistance and electric capacity.
During use, a kind of leakage protecting plug reset key changing ground wire protected mode is pressed, the consuming device that the closed connection mains supply of phase line switch contacts 7, zero line switch contacts 8, ground wire switch contacts 9 is lower end provides working power.
In use, leak electricity if damaged generation occurs in the insulation of consuming device, zero sequence current mutual inductor 17 detects this electric leakage signal and the 1st input 16-1 of this signal input amplifying circuit 16 and the 2nd input 16-2, when leakage current reaches predetermined threshold values, the trigger output end 16-4 output signal of amplifying circuit 16 triggers controllable silicon 15 conducting makes solenoid 13 work, phase line switch contacts 7, zero line switch contacts 8, ground wire switch contacts 9 are all disconnected immediately, thus has ensured the Electrical Safety of people.
If when leakage protecting plug of the present invention is selected the 2nd change over switch 26-2 and the 1st change over switch 26-1 to be connected to ground wire fault-current protection pattern according to environment for use in advance, connect between the 1st foot 26-2-1 of the 2nd change over switch 26-2 and the 3rd foot 26-2-3 of the 2nd change over switch 26-2, the 2nd foot 26-2-2's of the 2nd change over switch 26-2 and the 3rd foot 26-2-3 of the 2nd change over switch 26-2 is separated, meanwhile, due to linkage action between the 1st change over switch 26-1 and the 2nd change over switch 26-2, also connect between the 1st foot 26-1-1 of the 1st change over switch 26-1 and the 3rd foot 26-1-3 of the 1st change over switch 26-1, also disconnect between the 2nd foot 26-1-2 of the 1st change over switch 26-1 and the 3rd foot 26-1-3 of the 1st change over switch 26-1, light-emitting diode 28 is in OFF state, instruction leakage protecting plug is in ground wire fault-current protection pattern.When grounding system generation exception causes the 1st ground wire 3 and the 2nd ground wire 6 accident is charged, ground wire electrified detection inductor 18 on ground wire fault current detection circuit detects the fault current flowing through the 2nd ground wire 6 immediately and signal is sent into the 1st input 16-1 and the 2nd input 16-2 of amplifying circuit 16, when the ground wire fault current detected is greater than predetermined current threshold, amplifying circuit 16 trigger output end 16-4 outputs signal the conducting of triggering controllable silicon 15 makes solenoid 13 work, phase line switch contacts 7, zero line switch contacts 8, ground wire switch contacts 9 all disconnects immediately, thus ensured the Electrical Safety of people better.
If when leakage protecting plug of the present invention is selected the 1st change over switch 26-1 and the 2nd change over switch 26-2 to be connected to ground wire false voltage protected mode according to environment for use in advance; the 1st foot 26-1-1's of the 1st change over switch 26-1 and the 3rd foot 26-1-3 of the 1st change over switch 26-1 is separated; connect between the 2nd foot 26-1-2 of the 1st change over switch 26-1 and the 3rd foot 26-1-3 of the 1st change over switch 26-1, light-emitting diode 28 luminescence is lighted instruction leakage protecting plug and is in ground wire false voltage protected mode.Meanwhile, due to linkage action between the 1st change over switch 26-1 and the 2nd change over switch 26-2, so, also disconnect between the 1st foot 26-2-1 of the 2nd change over switch 26-2 and the 3rd foot 26-2-3 of the 2nd change over switch 26-2, also connect between the 2nd foot 26-2-2 of the 2nd change over switch 26-2 and the 3rd foot 26-2-3 of the 2nd change over switch 26-2.When grounding system generation exception causes the 1st ground wire 3 and the 2nd ground wire 6 accident is charged, photoelectrical coupler 22 on ground wire false voltage testing circuit outputs signal to the 1st triode 24, when the ground wire false voltage detected is greater than predetermined threshold voltage, 1st triode 24 exports high level signal and makes its conducting to the 1st diode 30-1 positive pole of one-way conduction circuit 30 and send into the 3rd latch input terminal 16-3 of amplifying circuit 16 and then make the conducting of the trigger output end 16-4 of amplifying circuit 16 output signal triggering controllable silicon 15 that solenoid 13 is worked, phase line switch contacts 7, zero line switch contacts 8, ground wire switch contacts 9 all disconnects immediately, thus ensured the Electrical Safety of people better.
Claims (9)
1. can change the leakage protecting plug of ground wire protected mode for one kind, include shell, latch, 1st phase line and the 2nd phase line, 1st zero line and the 2nd zero line, 1st ground wire and the 2nd ground wire, the zero sequence current mutual inductor that described 2nd phase line and the 2nd zero line all pass, the ground wire electrified detection inductor that described 2nd ground wire passes, test loop, electromagnetic trip and locker, this electromagnetic trip and locker are by solenoid and drive circuit thereof, phase line switch contacts, zero line switch contacts, ground wire switch contacts forms, the drive circuit of described solenoid is primarily of the 1st rectification circuit, controllable silicon, 1st resistance, amplifying circuit forms, it is characterized in that: be also provided with ground wire false voltage testing circuit, 1st change over switch, 2nd change over switch, one-way conduction circuit, described ground wire false voltage testing circuit is provided with the 1st electric capacity, the 2nd rectification circuit, the 3rd Resistor-Capacitor Unit, photoelectrical coupler, the 4th resistance, the 1st triode, the 5th resistance, 1st resistance one end is connected with the 1st rectification circuit DC output end positive pole, controllable silicon anode, the 1st resistance other end is connected with the power end of amplifying circuit, the 3rd foot of the 1st change over switch, ground end, the controllable silicon negative electrode of amplifying circuit are connected with the 1st rectification circuit DC output end negative pole, and the trigger output end of amplifying circuit is connected with SCR control pole, one output, an output of described ground wire electrified detection inductor secondary winding of described zero sequence current mutual inductor secondary winding are connected with the 2nd input of described amplifying circuit, and another output of described zero sequence current mutual inductor secondary winding is connected with the 1st input of described amplifying circuit, described another output of ground wire electrified detection inductor secondary winding is connected with the 3rd foot of the 2nd change over switch, is connected after the 1st foot series connection the 6th resistance of the 2nd change over switch with the 1st input of amplifying circuit, by described 1st electric capacity, the ac input end of the 2nd rectification circuit, the loop that 3rd Resistor-Capacitor Unit is in series successively is connected between the 1st described ground wire and the 1st zero line, the DC output end of the 2nd rectification circuit and the input of photoelectrical coupler are connected in parallel, photoelectrical coupler one output, 1st transistor collector is connected with the 2nd foot of the 1st change over switch, another output of photoelectrical coupler and the 4th resistance one end, 1st transistor base connects, 1st transistor emitter is connected with the 5th resistance one end, the 5th resistance other end, the 4th resistance other end is connected with the 1st rectification circuit DC output end negative pole, the input of one-way conduction circuit and the 1st transistor emitter, 5th resistance one end connects, the output of one-way conduction circuit is connected with the 3rd latch input terminal of amplifying circuit, described 1st change over switch and described 2nd change over switch link and open or close.
2. a kind of leakage protecting plug changing ground wire protected mode according to claim 1, is characterized in that: be also provided with the 2nd resistance and light-emitting diode; 2nd resistance one end is connected with the 2nd foot of the 1st change over switch, and the 2nd resistance other end is connected with light-emitting diode positive pole, and light-emitting diode negative pole is connected with the 1st rectification circuit DC output end negative pole.
3. a kind of leakage protecting plug changing ground wire protected mode according to claim 1, is characterized in that: on described 1st change over switch and the integrated drain pan being arranged on described shell of the 2nd change over switch.
4. a kind of leakage protecting plug changing ground wire protected mode according to claim 2, is characterized in that: described light-emitting diode is arranged on the face-piece of described shell.
5. a kind of leakage protecting plug changing ground wire protected mode according to claim 1, is characterized in that: described one-way conduction circuit is made up of the 1st diode.
6. a kind of leakage protecting plug changing ground wire protected mode according to claim 1, is characterized in that: described one-way conduction circuit is made up of the 2nd triode.
7. a kind of leakage protecting plug changing ground wire protected mode according to claim 1, is characterized in that: described 3rd Resistor-Capacitor Unit is made up of resistance.
8. a kind of leakage protecting plug changing ground wire protected mode according to claim 1, is characterized in that: described 3rd Resistor-Capacitor Unit is made up of electric capacity.
9. a kind of leakage protecting plug changing ground wire protected mode according to claim 1, is characterized in that: described 3rd Resistor-Capacitor Unit is made up of the assembly of resistance and electric capacity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510479997.8A CN105024240A (en) | 2015-08-07 | 2015-08-07 | Earth leakage protection plug capable of converting ground wire protection modes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510479997.8A CN105024240A (en) | 2015-08-07 | 2015-08-07 | Earth leakage protection plug capable of converting ground wire protection modes |
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| Publication Number | Publication Date |
|---|---|
| CN105024240A true CN105024240A (en) | 2015-11-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510479997.8A Pending CN105024240A (en) | 2015-08-07 | 2015-08-07 | Earth leakage protection plug capable of converting ground wire protection modes |
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| CN1350352A (en) * | 2001-11-01 | 2002-05-22 | 刘锦泰 | Leakage protection plug |
| US20060198066A1 (en) * | 2005-03-02 | 2006-09-07 | Zhejiang Dongzheng Electrical Co., Ltd | Permanent-magnet ground fault circuit interrupter plug and its permanent-magnet mechanism therein |
| CN202094431U (en) * | 2011-06-23 | 2011-12-28 | 刘睿刚 | Leakage protection plug |
| CN102544930A (en) * | 2012-03-07 | 2012-07-04 | 佛山市新基德电子厂有限公司 | Leakage protection plug |
| CN104577977A (en) * | 2014-12-26 | 2015-04-29 | 余姚市嘉荣电子电器有限公司 | Voltage and current switchable type electric leakage protection device |
| CN104767173A (en) * | 2015-03-20 | 2015-07-08 | 余姚市嘉荣电子电器有限公司 | IC-free optical-coupler detection ground wire voltage abnormity electricity leakage protection device |
| CN205122902U (en) * | 2015-08-07 | 2016-03-30 | 深圳市良辉科技有限公司 | Can change ground wire protected mode's leakage protection plug |
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2015
- 2015-08-07 CN CN201510479997.8A patent/CN105024240A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1350352A (en) * | 2001-11-01 | 2002-05-22 | 刘锦泰 | Leakage protection plug |
| US20060198066A1 (en) * | 2005-03-02 | 2006-09-07 | Zhejiang Dongzheng Electrical Co., Ltd | Permanent-magnet ground fault circuit interrupter plug and its permanent-magnet mechanism therein |
| CN202094431U (en) * | 2011-06-23 | 2011-12-28 | 刘睿刚 | Leakage protection plug |
| CN102544930A (en) * | 2012-03-07 | 2012-07-04 | 佛山市新基德电子厂有限公司 | Leakage protection plug |
| CN104577977A (en) * | 2014-12-26 | 2015-04-29 | 余姚市嘉荣电子电器有限公司 | Voltage and current switchable type electric leakage protection device |
| CN104767173A (en) * | 2015-03-20 | 2015-07-08 | 余姚市嘉荣电子电器有限公司 | IC-free optical-coupler detection ground wire voltage abnormity electricity leakage protection device |
| CN205122902U (en) * | 2015-08-07 | 2016-03-30 | 深圳市良辉科技有限公司 | Can change ground wire protected mode's leakage protection plug |
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Application publication date: 20151104 |