CN205141288U - Convertible ground wire protected mode's leakage protection plug - Google Patents
Convertible ground wire protected mode's leakage protection plug Download PDFInfo
- Publication number
- CN205141288U CN205141288U CN201520552338.8U CN201520552338U CN205141288U CN 205141288 U CN205141288 U CN 205141288U CN 201520552338 U CN201520552338 U CN 201520552338U CN 205141288 U CN205141288 U CN 205141288U
- Authority
- CN
- China
- Prior art keywords
- ground wire
- resistance
- circuit
- change over
- over switch
- 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
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model provides a convertible ground wire protected mode's leakage protection plug is by the shell, the bolt, looks, zero ground wire, zero sequence current transformer, test circuit, the electromagnetism is threaded off and locking device, ground wire fault current detection circuit, ground wire fault voltage detection circuitry, the 1st, 2 change over switch, the unidirectional flux circuit is formed, the 1st of two outputs of zero sequence current transformer secondary and amplifier circuit, 2 input parallel connection, unidirectional flux circuit output is connected with amplifier circuit's the 3rd middle input. The secondary coil that electrification of ground wire detected the inductor is through 2 change over switch and the 1st diode and 2 controllable silicon control electrode return circuit parallel connection. This leakage protection plug can carry out the selectivity conversion to ground wire fault current protected mode and ground wire fault voltage mode, has solved the leakage protection plug unwanted tripping problem, has ensured that people's power consumption is safer.
Description
Technical field
The utility model relates to Electrical Safety resist technology field, especially relates to a kind of leakage protecting plug of convertible 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 kind of 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 is lower but occur causing leakage protecting plug mistrip when being greater than predetermined threshold values fault current because of ground wire at ground wire false voltage, causes people normally to use.
Chinese patent literature CN202142735U also discloses a kind of leakage protecting plug that can detect ground wire false voltage, and this kind of 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 kind of 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 kind of leakage protecting plug mistrip, cause people normally to use.
For this reason, in the urgent need to a kind of product of earth wire charged protecting that can adapt to various power utilization environment on electric heater market, thus the probability that minimizing returns goods after sale and keep in repair can be reached.
Summary of the invention
The purpose of this utility model is the leakage protecting plug providing a kind of convertible 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 earth wire charged protecting function of ground wire detection failure electric current and detection failure voltage; thus both solved leakage protecting plug and cause the problem that cannot normally use because of mistrip, again reduce product after-sales service rate and maintenance cost.
The technical solution that the utility model proposes is such:
A leakage protecting plug for convertible ground wire protected mode, includes 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, 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, and the drive circuit of described solenoid is primarily of the 1st rectification circuit, 1st controllable silicon, 1st resistance, amplifying circuit forms, and an output of described zero sequence current mutual inductor secondary winding and another output are connected in parallel with the 1st input of described amplifying circuit and the 2nd input respectively, are also provided with ground wire fault current detection circuit, ground wire false voltage testing circuit, 1st change over switch, 2nd change over switch, one-way conduction circuit, described ground wire fault current detection circuit is provided with ground wire electrified detection inductor, 2nd resistance, 1st diode, 2nd controllable silicon, 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, the 1st resistance one end and the 1st rectification circuit DC output end positive pole, 1st controllable silicon anode connects, the 1st resistance other end respectively with the power end of amplifying circuit, 2nd resistance one end, 3rd foot of the 1st change over switch connects, and the 2nd resistance other end is connected with the 1st diode cathode, the 1st diode cathode, the ground end of amplifying circuit, 1st controllable silicon negative electrode is connected with the 1st rectification circuit DC output end negative pole, and described 2nd ground wire passes ground wire electrified detection inductor, ground wire electrified detection inductor secondary winding one output and the 2nd resistance other end, 1st diode cathode connects, and another output of ground wire electrified detection inductor secondary winding is connected with the 3rd foot of the 2nd change over switch, and the 1st foot of the 2nd change over switch is connected with the 2nd SCR control pole, the 2nd controllable silicon anode, the positive pole of negative electrode the respectively with 1st rectification circuit DC output end, negative pole connects, 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, and 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 respectively, another output of photoelectrical coupler and the 4th resistance one end, 1st transistor base connects, and the 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, and the output of one-way conduction circuit is connected with the 3rd intermediate input end of amplifying circuit, described 1st change over switch and described 2nd change over switch link and open or close.
Also be provided with the 6th resistance and light-emitting diode, the 6th resistance one end is connected with the 2nd foot of the 1st change over switch, and the 6th 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 2nd diode.
Described one-way conduction circuit also can be made up of the 2nd triode.
Described 3rd Resistor-Capacitor Unit is made up of resistance.
Described 3rd Resistor-Capacitor Unit can 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 utility model has following beneficial effect:
(1) leakage protecting plug of a kind of convertible ground wire protected mode of the present utility model 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 utility model provides a kind of safer Electrical Safety guarantee than existing leakage protecting plug.
(2) leakage protecting plug of the present utility model can detect the false voltage that ground wire occurs; once the false voltage that ground wire surprisingly occurs 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 utility model provides a kind of safer Electrical Safety guarantee than existing leakage protecting plug.
(3) leakage protecting plug of the present utility model goes to select the different defencive functions to ground wire electrification by change over switch; so just can select suitable earth wire charged protecting function for concrete power utilization environment; both solve existing leakage protecting plug and caused the problem that cannot normally use because of mistrip, again reduce product after-sales service rate and maintenance cost.
(4) leakage protecting plug of the present utility model is due to the built-in stabilized voltage power supply of the current-limiting resistance and amplifying circuit that make use of amplifying circuit dexterously, therefore without the need to setting up stabilized voltage power supply and dropping resistor in addition, saves production cost.
(5) the ground wire fault current detection signal of leakage protecting plug of the present utility model is owing to can be added on the 1st diode; thus the requirement of the output characteristic to ground wire electrified detection inductor is reduced; simplify circuit structure, reduce small product size and reduce production cost.
The leakage protecting plug of a kind of convertible ground wire protected mode of the present utility model is mainly used in the earth leakage protective of various household electrical appliance, can make the power line of band leakage protecting plug.
Accompanying drawing explanation
Fig. 1 is the electrical block diagram of the leakage protecting plug of a kind of convertible ground wire protected mode of the utility model embodiment;
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 utility model is further elaborated.
Shown in Figure 1, a kind of leakage protecting plug of convertible ground wire protected mode, include shell, latch, 1st phase line 1 and the 2nd phase line 4, 1st zero line 2 and the 2nd zero line 5, 1st ground wire 3 and the 2nd ground wire 6, the zero sequence current mutual inductor 17 that described 2nd phase line 4 and the 2nd zero line 5 all pass, test loop 40, electromagnetic trip and locker, this electromagnetic trip and locker are by solenoid 13 and drive circuit thereof, phase line switch contacts 7, zero line switch contacts 8, ground wire switch contacts 9 forms, the drive circuit of described solenoid 13 is primarily of the 1st rectification circuit 14, 1st controllable silicon 15, 1st resistance 10, amplifying circuit 16 forms, one output of described zero sequence current mutual inductor 17 secondary winding and another output are connected in parallel with the 1st input 16-1 of described amplifying circuit 16 and the 2nd input 16-2 respectively.Also be provided with ground wire fault current detection circuit, 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 fault current detection circuit is provided with ground wire electrified detection inductor 18, the 2nd resistance 11, the 1st diode 12, the 2nd controllable silicon 27.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 is connected with the 1st rectification circuit 14 DC output end positive pole, the 1st controllable silicon 15 anode, 1st resistance 10 other end is connected with the 3rd foot 26-1-3 of the power end Vs1 of amplifying circuit 16, the 2nd resistance 11 one end, the 1st change over switch 26-1 respectively, 2nd resistance 11 other end is connected with the 1st diode 12 positive pole, and ground end GND, the 1st controllable silicon 15 negative electrode of the 1st diode 12 negative pole, amplifying circuit 16 are connected with the 1st rectification circuit 14 DC output end negative pole.Described 2nd ground wire 6 is through ground wire electrified detection inductor 18, ground wire electrified detection inductor 18 secondary winding one output and the 2nd resistance 11 other end, 1st diode 12 positive pole connects, 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 controls pole with the 2nd controllable silicon 27 and is connected, 2nd controllable silicon 27 anode, the positive pole of negative electrode the respectively with 1st rectification circuit 14 DC output end, negative pole connects, 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, 1st triode 24 base stage 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 is connected with the 1st triode 24 emitter, the 5th resistance 25 one end, and the output end vo 1 of one-way conduction circuit 30 is connected with the 3rd intermediate input end 16-3 of amplifying circuit 16.Described 1st change over switch 26-1 and described 2nd change over switch 26-2 links and opens or closes.
The utility model can also be equipped with the 6th resistance 29 and light-emitting diode 28 in the collector loop of the 1st triode 24, as shown in Figure 1,6th resistance 29 one end is connected with the 2nd foot 26-1-2 of the 1st change over switch 26-1, the 6th resistance other end 29 is connected with light-emitting diode 28 positive pole, light-emitting diode 28 negative pole is connected with the 1st rectification circuit 14 DC output end negative pole, and 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 2nd 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 directly connected with the input Vi1 of one-way conduction circuit 30, the emitter of the 2nd triode 30-2 is directly connected with the output end vo 1 of one-way conduction circuit 30, and the collector electrode Vc1 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, leakage protecting plug reset key 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 using, 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, amplifying circuit 16 outputs signal the conducting of triggering the 1st controllable silicon 15 and solenoid 13 is worked phase line switch contacts 7, zero line switch contacts 8, ground wire switch contacts 9 all disconnected immediately, thus has ensured the Electrical Safety of people.
If when leakage protecting plug of the present utility model 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, so, 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 and 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 outputs signal to the 2nd controllable silicon 27, when the ground wire fault current detected is greater than predetermined current threshold, triggering the 2nd controllable silicon 27 conducting after the signal that ground wire electrified detection inductor 18 secondary winding exports superposes with the clamper pressure drop of the 1st diode 12 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 utility model 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 29 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 to one-way conduction circuit 30 conducting and signal is sent into the 3rd intermediate input end 16-3 of amplifying circuit 16 and impels amplifying circuit 16 to output signal the conducting of triggering the 1st controllable silicon 15 to make 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.
Claims (9)
1. the leakage protecting plug of a convertible 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, 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, 1st controllable silicon, 1st resistance, amplifying circuit forms, one output of described zero sequence current mutual inductor secondary winding and another output are connected in parallel with the 1st input of described amplifying circuit and the 2nd input respectively, it is characterized in that: be also provided with ground wire fault current detection circuit, ground wire false voltage testing circuit, 1st change over switch, 2nd change over switch, one-way conduction circuit, described ground wire fault current detection circuit is provided with ground wire electrified detection inductor, the 2nd resistance, the 1st diode, the 2nd controllable silicon, and 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 and the 1st rectification circuit DC output end positive pole, 1st controllable silicon anode connects, the power end of the 1st resistance other end and amplifying circuit, 2nd resistance one end, 3rd foot of the 1st change over switch connects, the 2nd resistance other end is connected with the 1st diode cathode, 1st diode cathode, the ground end of amplifying circuit, 1st controllable silicon negative electrode is connected with the 1st rectification circuit DC output end negative pole, described 2nd ground wire is through ground wire electrified detection inductor, ground wire electrified detection inductor secondary winding one output and the 2nd resistance other end, 1st diode cathode connects, another output of ground wire electrified detection inductor secondary winding is connected with the 3rd foot of the 2nd change over switch, 1st foot of the 2nd change over switch is connected with the 2nd SCR control pole, 2nd controllable silicon anode, the positive pole of negative electrode the respectively with 1st rectification circuit DC output end, negative pole connects, 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 intermediate input end of amplifying circuit, described 1st change over switch and described 2nd change over switch link and open or close.
2. the leakage protecting plug of a kind of convertible ground wire protected mode according to claim 1, is characterized in that: be also provided with the 6th resistance and light-emitting diode; 6th resistance one end is connected with the 2nd foot of the 1st change over switch, and the 6th 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. the leakage protecting plug of a kind of convertible 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. the leakage protecting plug of a kind of convertible 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. the leakage protecting plug of a kind of convertible ground wire protected mode according to claim 1, is characterized in that: described one-way conduction circuit is made up of the 2nd diode.
6. the leakage protecting plug of a kind of convertible 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. the leakage protecting plug of a kind of convertible ground wire protected mode according to claim 1, is characterized in that: described 3rd Resistor-Capacitor Unit is made up of resistance.
8. the leakage protecting plug of a kind of convertible ground wire protected mode according to claim 1, is characterized in that: described 3rd Resistor-Capacitor Unit is made up of electric capacity.
9. the leakage protecting plug of a kind of convertible 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 |
|---|---|---|---|
| CN201520552338.8U CN205141288U (en) | 2015-07-28 | 2015-07-28 | Convertible ground wire protected mode's leakage protection plug |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520552338.8U CN205141288U (en) | 2015-07-28 | 2015-07-28 | Convertible ground wire protected mode's leakage protection plug |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205141288U true CN205141288U (en) | 2016-04-06 |
Family
ID=55627046
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520552338.8U Active CN205141288U (en) | 2015-07-28 | 2015-07-28 | Convertible ground wire protected mode's leakage protection plug |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205141288U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108199239A (en) * | 2018-02-26 | 2018-06-22 | 浙江双鸿新能源科技有限公司 | A kind of 3D printing supply line double back circuit switching device and its application method |
-
2015
- 2015-07-28 CN CN201520552338.8U patent/CN205141288U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108199239A (en) * | 2018-02-26 | 2018-06-22 | 浙江双鸿新能源科技有限公司 | A kind of 3D printing supply line double back circuit switching device and its application method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102544930B (en) | Leakage protection plug | |
| CN102324717B (en) | Leakage protection device | |
| CN205141289U (en) | Convertible ground wire protected mode's leakage protection plug | |
| CN102354869B (en) | Electricity leakage protection plug with alarm device | |
| CN101872957B (en) | Leakage current detection protection circuit | |
| CN202817702U (en) | Current leakage protection device | |
| CN105006708A (en) | Protection-mode-convertible electric leakage protection plug | |
| CN204927704U (en) | Convertible ground wire protected mode's leakage protection plug | |
| CN205029118U (en) | Convertible protected mode's leakage protection plug | |
| CN205029117U (en) | Current leakage protection plug | |
| CN103762557B (en) | The anti-open-circuit-protection method of current transformer | |
| CN205753342U (en) | Earth leakage protective device | |
| CN205141288U (en) | Convertible ground wire protected mode's leakage protection plug | |
| CN202183530U (en) | Electric leakage protection plug with alarming device | |
| CN205141287U (en) | Can change ground wire protected mode's leakage protection plug | |
| CN205122902U (en) | Can change ground wire protected mode's leakage protection plug | |
| CN201466675U (en) | Leakage detection protection circuit | |
| CN204905588U (en) | Electric leakage protection plug | |
| CN105006710A (en) | Ground-wire-protection-mode-convertible electric leakage protection plug | |
| CN205029116U (en) | Can change protected mode's leakage protection plug | |
| CN101944716A (en) | Electricity leakage detection protective circuit | |
| CN101895088A (en) | Leakage detection protection circuit | |
| CN205029115U (en) | Can change protected mode's leakage protection plug | |
| CN201422009Y (en) | Leakage detection and protection circuit | |
| CN105006711A (en) | Leakage protection plug capable of converting ground wire protection mode |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |