CN205051332U - Earth leakage detection device - Google Patents
Earth leakage detection device Download PDFInfo
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- CN205051332U CN205051332U CN201520857057.3U CN201520857057U CN205051332U CN 205051332 U CN205051332 U CN 205051332U CN 201520857057 U CN201520857057 U CN 201520857057U CN 205051332 U CN205051332 U CN 205051332U
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Abstract
The utility model provides an earth leakage detection device can be through reducing part messenger equipment miniaturization in addition. The disequilibrium of the electric current that earth leakage detection device (10) are flow past in according to AC circuit (2) detects the electric leakage, and wherein, this earth leakage detection device (10) have: ZCT (11), its disequilibrium that detects the electric current that flows past in AC circuit (2), relay (14), its series connection is on AC circuit (2), relay operation controlling element (22), it detects out when uneven at ZCT (11), makes relay (14) move and cuts AC circuit (2), rise time tester (28), and rise time decision circuit (29).
Description
Technical field
The utility model relates to a kind of earth detector, and this earth detector detects the electric leakage of AC circuit, and blocks AC circuit when detecting electric leakage.
Background technology
In the electronic device, when AC circuit creates electric leakage, the malfunction of equipment may be caused or cause electric shock.Therefore, install earth detector on an electronic device sometimes, this earth detector detects the electric leakage of AC circuit, and blocks AC circuit (for example, referring to patent documentation 1) when detecting electric leakage.
As shown in Figure 1, earth detector 10a in the past has ZCT (Zero-Phase-Current-Transformer: zero phase current transformer) 11, this ZCT11 detects the imbalance different toward the current value in road and loop of the AC circuit 2 connected from AC power supplies 1, is connected with the noise filter 19 of the noise for removing AC circuit 2 between ZCT11 and control circuit 20a.And, this earth detector 10a also has relay 14, rectification diode 15, smmothing capacitor 16, LED12, regeneration diode 18 and reset switch 13, wherein, described relay 14 detects electric leakage according to the output of ZCT11, and accepts to block output to block AC circuit 2 from control circuit 20a.
ZCT11 is made up of the magnetic 11b of the ring-type being wrapped coil 11a, and AC circuit 2 is applied in the ring of magnetic 11b.When causing the past road of AC circuit 2 and the current value in loop to create difference there is electric leakage, the coil 11a that magnetic 11b is wound around can produce electromotive force, and the both end voltage of coil 11a exports as ZCT and is input to ZCT input terminal T1, T2 of control circuit 20a.
The noise overlapped on AC circuit 2 is input to control circuit 20a by ZCT11, when exceeding detection of electrical leakage reference voltage (V1) 25, be judged to be electric leakage.When being judged to be electric leakage, exporting truncated signal from the lead-out terminal T4 of control circuit 20a, relay contact 14a, 14b of relay 14 being opened, thus blocks AC circuit 2.When AC circuit 2 is truncated, stop carrying out AC supply to device, the action of arresting stop.In order to tackle the malfunction caused by noise, as shown in Figure 1, the output of ZCT11 is connected with noise filter 19.
Control circuit 20a is the integrated circuit (IC) with ZCT input terminal T1, T2, lead-out terminal T3, Vcc terminal T4, earth terminal T5 and reseting terminal T6.The output being imported into the ZCT11 between ZCT input terminal T1-T2 is compared by noise filter 19 and detection of electrical leakage reference voltage (V1) 25.When the output of the ZCT11 that have passed noise filter 19 exceedes detection of electrical leakage reference voltage (V1) 25, from the truncated signal of lead-out terminal T4 output relay 14.
One at AC circuit 2 is connected in series with rectification diode 15 and smmothing capacitor 16 between line and earth terminal.The Vcc terminal T3 of control circuit 20a is connected on the tie point of rectification diode 15 and smmothing capacitor 16.Another connecting terminals of smmothing capacitor 16 is connected on the earth terminal T5 of control circuit 20a.Thus, make the voltage of AC circuit 2 level and smooth by smmothing capacitor 16, be input to the Vcc terminal T3 in control circuit 20a as power source voltage Vcc.
Further, between two terminals of smmothing capacitor 16, be connected in series with relay coil 14c, LED12 and the actuating of relay control element 22 of relay 14.When causing the output of the ZCT11 be input between T1-T2 to exceed detection of electrical leakage reference voltage (V1) 25 when there is electric leakage, exporting high level from latch cicuit 23, actuating of relay control element 22 is connected.Actuating of relay control element 22 continues on-state by the latch cicuit 23 in control circuit 20a.When actuating of relay control element 22 is switched on, electric current can flow through relay coil 14c and LED12 of the relay 14 be connected in series.Thus, relay contact 14a, 14b of being connected in series with AC circuit 2 are opened and make relay 14 become operate condition, thus block AC circuit 2.Further, light by LED12 the detection and the blocking of AC circuit 2 that notify to leak electricity.In addition, the relay coil 14c of relay 14 is connected in parallel to regeneration diode 18, the counter electromotive force produced in this regeneration diode 18 couples of relay coil 14c regenerates.
Control circuit 20a is connected with reset switch 13.Make the latch cicuit 23 in control circuit 20a carry out reset by connection reset switch 13 and carry out cutoff relay action control element 22.Thus, relay 14 becomes halted state, and blocking of relay 14 pairs of AC circuits 2 is removed, and LED12 extinguishes.
[patent documentation 1] Japanese Unexamined Patent Publication 2000-217245 publication
In the prior art, in order to prevent the error detection being caused electric leakage by the noise of AC circuit, the efferent of ZCT is connected with the noise filter be made up of the discrete part of capacitor or resistance.Due to noise filter, can suppress miniaturized or the operating lag of generation detection of electrical leakage.
Utility model content
The purpose of this utility model puts in view of the above problems and solves the problem of conventional art, the utility model provides a kind of earth detector, this earth detector by reducing outer tape member and miniaturization of the apparatus, and can reduce the operating lag of detection of electrical leakage.
The utility model provides a kind of earth detector, and this earth detector detects electric leakage according to the imbalance of the electric current flow through in AC circuit, and when detecting described electric leakage, block described AC circuit, it is characterized in that, this earth detector has:
Relay, it is connected in series on described AC circuit;
Zero phase current transformer, it detects the imbalance of the electric current flow through in described AC circuit, and is converted to voltage;
Rise time tester, it measures the rise time of described voltage; And
Decision circuit, it is according to the rise time described in threshold determination,
This earth detector blocks described relay according to the decision content of described decision circuit.
According to the utility model, can establish in the function identical with noise filter in integrated circuits simply.Further, following effect is obtained: can by reducing outer tape member and miniaturization of the apparatus, and operating lag when can reduce electric leakage.
Accompanying drawing explanation
Fig. 1 shows the circuit structure diagram of the structure of earth detector in the past.
Fig. 2 shows the circuit structure diagram of the structure of the first execution mode of earth detector of the present utility model.
Fig. 3 shows the circuit structure diagram of the structure of the second execution mode of earth detector of the present utility model.
Fig. 4 shows the circuit structure diagram of the structure of the 3rd execution mode of earth detector of the present utility model.
The figure of the waveform of the lead-out terminal T4 of voltage (between T1-T2) between the ZCT input terminal that Fig. 5 shows the control circuit shown in Fig. 2, the output (Co1) of detection of electrical leakage comparator, the output (Co2) of noise measuring comparator and control circuit.
The figure of the waveform of voltage (between T1-T2), the output (Co1) of detection of electrical leakage comparator, the lead-out terminal T4 of control circuit between the ZCT input terminal that Fig. 6 shows the control circuit shown in Fig. 3.
Label declaration
1:AC power supply; 2:AC circuit; 10a, 10b, 10c, 10d: earth detector; 11:ZCT (zero phase current transformer); 11a: coil; 11b: magnetic; 12:LED; 13: reset switch; 14: relay; 14a: relay contact; 14b: relay contact; 14c: relay coil; 15: rectification diode; 16: smmothing capacitor; 17: control circuit; 18: noise filter; 19: regeneration diode; 20a, 20b, 20c, 20d: control circuit; 21: interior power supply circuit (Reg); 22: actuating of relay control element; 23: latch cicuit; 24: detection of electrical leakage comparator; 25: detection of electrical leakage is with reference voltage (V1); 26: noise measuring comparator; 27: noise measuring is with reference voltage (V2); 28: rise time tester; 29: rise time decision circuit; 30: overtime tester; 31: overtime decision circuit; 32:OR circuit; T1:ZCT input terminal; T2:ZCT input terminal; T3:Vcc terminal; T4: lead-out terminal; T5: earth terminal; T6: reseting terminal.
Embodiment
Next, with reference to accompanying drawing, execution mode of the present utility model is specifically described.In addition, in the various figures, give identical label to identical structure and omit the explanation of its part.
(the first execution mode)
With reference to Fig. 2, the earth detector 10b of the first execution mode has: ZCT (Zero-Phase-Current-Transformer: zero phase current transformer) 11, and it detects the imbalance different with the current value in loop from the past road of the AC circuit 2 that AC power supplies 1 connects; Control circuit 20b, it detects electric leakage according to the output of ZCT11 and makes relay 14 carry out action; Relay 14, it blocks AC circuit 2; Rectification diode 15; Smmothing capacitor 16; LED12; And reset with switch 13.
ZCT11 is made up of the magnetic 11b of the ring-type being wrapped coil 11a, and AC circuit 2 is applied in the ring of magnetic 11b.When causing the past road of AC circuit 2 and the current value in loop to create difference there is electric leakage, the coil 11a that magnetic 11b is wound around can produce electromotive force, the both end voltage of coil 11a as ZCT11 output and be input to ZCT input terminal T1, T2 of control circuit 20b.
Relay 14 has relay contact 14a, 14b of being connected in series with AC circuit 2 and the relay coil 14c driving relay contact 14a, 14b.This relay 14 by flowing through the electric current of regulation and make relay contact 14a, 14b become the operate condition opened in relay coil 14c, thus blocks AC circuit 2.
Control circuit 20b is the semiconductor integrated circuit (IC) with ZCT input terminal T1, T2, Vcc terminal T3, lead-out terminal T4, earth terminal T5 and reseting terminal T6.Further, control circuit 20b has interior power supply circuit (Reg) 21, rise time tester 28, rise time decision circuit 29, detection of electrical leakage comparator 24, detection of electrical leakage reference voltage (V1) 25, noise measuring comparison circuit device 26, noise measuring reference voltage (V2) 27, latch cicuit 23 and actuating of relay control element 22.
Rectification diode 15 and smmothing capacitor 16 is connected in series with between a line and earth terminal T5 of AC circuit 2.The Vcc terminal T3 of control circuit 20b is connected on the tie point of rectification diode 15 and smmothing capacitor 16.Another connecting terminals of smmothing capacitor 16 is connected on the earth terminal T5 of control circuit 20b.Thus, make the voltage of AC circuit 2 level and smooth by smmothing capacitor 16, be input to the Vcc terminal T3 of control circuit 20a as power source voltage Vcc.
Further, between the tie point and the lead-out terminal T4 of control circuit 20b of rectification diode 15 and smmothing capacitor 16, be connected in series with relay coil 14c and LED12 of relay 14.In addition, the relay coil 14c of relay 14 is connected in parallel to regeneration diode 18, the counter electromotive force produced in this regeneration diode 18 couples of relay coil 14c regenerates.
As shown in Figure 5, the rise time overlapping the voltage of the noise on AC circuit 2 is short, and generation time is also short.In the first embodiment, by the rise time of the voltage of (between T2-T1 terminal) between measurement ZCT input terminal, the voltage of (between T2-T1 terminal) has exceeded detection of electrical leakage reference voltage (V1) 25 when between ZCT input terminal, judge it is electric leakage or noise by rise time decision circuit 29.
Between ZCT input terminal, the voltage of (between T2-T1 terminal) and detection of electrical leakage reference voltage (V1) 25 are compared by detection of electrical leakage comparator 24.The voltage ratio detection of electrical leakage reference voltage (V1) 25 of (between T2-T1 terminal) is high when between ZCT input terminal, export high level from the output (Co1) of detection of electrical leakage comparator 24.Further, between ZCT input terminal, the voltage of (between T2-T1 terminal) and noise measuring reference voltage (V2) 27 are also compared by noise measuring comparator 26.The voltage ratio noise measuring reference voltage (V2) 27 of (between T2-T1 terminal) is high when between ZCT input terminal, export high level from the output (Co2) of noise measuring comparator 26.Risen to the time difference (t1) of high level by measurement Co1 and Co2, the rise time of the voltage of (between T2-T1 terminal) between ZCT input terminal can be measured.
When (between T2-T1 terminal) applies voltage between to ZCT input terminal, rise time tester 28 measures the time difference (t1) that Co1 and Co2 rises to high level.Rise time decision circuit 29 is provided with the threshold value of rise time poor (t1), is judged to be noise when t1 is below threshold value, is judged to be electric leakage time more than threshold value.When being judged to be noise, the output of rise time decision circuit 29 maintains low level, and relay 14 does not block.When being judged to be electric leakage, the output of rise time decision circuit 29 exports high level and is input to by high level and makes the output of latch cicuit 23 export high level in latch cicuit 23.When exporting high level from latch cicuit 23, actuating of relay control element 22 becomes operate condition and makes electric current flow through relay coil 14c.When electric current flows through relay coil 14c, relay contact 14a, 14b open, thus block AC circuit 2.Further, light by LED12 the detection and the blocking of AC circuit 2 that notify to leak electricity.
Even if remove the reason of electric leakage and make the low level that is output into of detection of electrical leakage comparator 24, the electric current flowing into lead-out terminal T4 also can be latched circuit 23 and latches and continue flowing, thus maintain AC circuit 2 block state.The reset of latch cicuit 23 is undertaken by the reset switch 13 be connected between the reseting terminal T6 of control circuit 20b and earth terminal.When reset switch 13 is connected, be electronegative potential by the current potential of the reseting terminal T6 making latch cicuit 23, thus latch cicuit 23 is resetted.After latch cicuit 23 resets, from the output of latch cicuit 23, low level is input to actuating of relay control element 22 and blocks the electric current flow through actuating of relay control element 22.Thus, relay 14 becomes halted state, and blocking of relay 14 pairs of AC circuits 2 is removed, and LED12 is extinguished.This state is the initial condition before electric leakage is detected.
In the earth detector 10a in the past shown in Fig. 1, between ZCT11 and control circuit 10, be connected with noise filter 19, make the noise error detection overlapped on AC circuit 2 to be become electric leakage.The parts such as electric capacity, resistance of noise filter 19 to dispersion combine and form.Due to noise filter 19, can suppress miniaturized or the operating lag of generation detection of electrical leakage.
Be directed to this, in the earth detector 10b of the present embodiment shown in Fig. 2, judge that the voltage of (between T2-T1 terminal) between ZCT input terminal is noise or electric leakage by the rise time of the voltage of (between T2-T1 terminal) between measurement ZCT input terminal, do not need noise filter 19.Thereby, it is possible to realize the miniaturization of earth detector and improve operating lag.
(the second execution mode)
With reference to Fig. 6, the rise time overlapping the voltage of the noise on AC circuit 2 is short, and generation time is also short.In this second embodiment, the voltage measuring (between T2-T1 terminal) between ZCT input terminal by overtime tester 30 has exceeded the time (t2) of detection of electrical leakage reference voltage (V1) 25.In the earth detector 10c of the second execution mode, by being judged that by overtime decision circuit 31 t2 judges that the voltage of (between T2-T1 terminal) between ZCT input terminal is electric leakage or noise.
From the earth detector 10b of the first execution mode, remove noise measuring comparator 26, noise measuring reference voltage (V1) 25, rise time tester 28, rise time decision circuit 29 and added overtime tester 30 and overtime decision circuit 31 with reference to Fig. 3, the earth detector 10c of the second execution mode.
Between the detection of electrical leakage comparator 24 pairs of ZCT input terminals being positioned at control circuit 20c, the voltage of (between T2-T1 terminal) and detection of electrical leakage reference voltage (V1) 25 compare.The voltage ratio detection of electrical leakage reference voltage (V1) 25 of (between T2-T1 terminal) is high when between ZCT input terminal, export high level from the output (Co1) of detection of electrical leakage comparator 24.The output (Co1) of detection of electrical leakage comparator 24 is imported into overtime tester 30.
When (between T2-T1 terminal) applies voltage between to ZCT input terminal, overtime tester 30 measures the time (t2) of the high level of Co1.Overtime decision circuit 31 is provided with the threshold value of overtime, is judged to be noise when t2 is below threshold value, is judged to be electric leakage time more than threshold value.When being judged to be noise, the output of overtime decision circuit 31 maintains low level, and relay 14 does not block.On the other hand, when being judged to be electric leakage, the output of rise time decision circuit 29 exports high level and is input to by high level and makes the output of latch cicuit 23 export high level in latch cicuit 23.When exporting high level from latch cicuit 23, making actuating of relay control element 22 become operate condition, making electric current flow through relay coil 14c.When electric current flows through relay coil 14c, relay contact 14a, 14b are opened, thus blocks AC circuit 2.Further, light by LED12 the detection and the blocking of AC circuit 2 that notify to leak electricity.Action after electric leakage releasing is identical with the first execution mode.
(the 3rd execution mode)
The rise time overlapping the voltage of the noise on AC circuit 2 is short, and generation time is also short.The voltage that the earth detector 10d of the 3rd execution mode measures (between T2-T1 terminal) between the rise time (t1) of the voltage of (between T2-T1 terminal) between ZCT input terminal and ZCT input terminal has exceeded time (t2) these both sides of detection of electrical leakage reference voltage (V1) 25, thus judges it is electric leakage or noise.
On the earth detector 10b of the first execution mode, added the overtime tester 30 and overtime decision circuit 31 that OR circuit 24 and the second execution mode have with reference to Fig. 4, the earth detector 10d of the 3rd execution mode.The input of OR circuit 32 is connected with the output of rise time decision circuit 29, and another input of OR circuit 32 is connected with the output of overtime decision circuit 31.In the third embodiment, the t1 measured in the first embodiment and these two times of t2 measured in this second embodiment are measured.
Between ZCT input terminal, the voltage of (between T2-T1 terminal) and detection of electrical leakage reference voltage (V1) 25 are compared by detection of electrical leakage comparator 24.The voltage ratio detection of electrical leakage reference voltage (V1) 25 of (between T2-T1 terminal) is high when between ZCT input terminal, export high level from the output (Co1) of detection of electrical leakage comparator 24.Further, between ZCT input terminal, the voltage of (between T2-T1 terminal) and noise measuring reference voltage (V2) 27 are also compared by noise measuring comparator 26.The voltage ratio noise measuring reference voltage (V2) 27 of (between T2-T1 terminal) is high when between ZCT input terminal, export high level from the output (Co2) of noise measuring comparator 26.Risen to the time difference (t1) of high level by measurement Co1 and Co2, the rise time of the voltage of (between T2-T1 terminal) between ZCT input terminal can be measured.
When (between T2-T1 terminal) applies voltage between to ZCT input terminal, rise time tester 28 measures the time difference (t1) that Co1 and Co2 rises to high level.Rise time decision circuit 29 is provided with the threshold value of rise time poor (t1), is judged to be noise when t1 is below threshold value, is judged to be electric leakage time more than threshold value.
Further, between ZCT input terminal, the voltage of (between T2-T1 terminal) and detection of electrical leakage reference voltage (V1) 25 are compared by detection of electrical leakage comparator 24.The voltage ratio detection of electrical leakage reference voltage (V1) 25 of (between T2-T1 terminal) is high when between ZCT input terminal, export high level from the output (Co1) of detection of electrical leakage comparator 24.The output (Co1) of detection of electrical leakage comparator 24 is imported into overtime tester 30.
When (between T2-T1 terminal) applies voltage between to ZCT input terminal, overtime tester 30 exceedes the time of detection of electrical leakage reference voltage (V1) 25 by the voltage that the measurement of the time (t2) of the high level of Co1 measures (between T2-T1 terminal) between ZCT input terminal.Overtime decision circuit 30 is provided with the threshold value of overtime, is judged to be noise when t2 is below threshold value, is judged to be electric leakage time more than threshold value.
The input of OR circuit 32 is connected with the output of rise time decision circuit 29, and another input of OR circuit 32 is connected with the output of overtime decision circuit 31.Between to ZCT input terminal (between T2-T1 terminal) apply voltage and any one in rise time decision circuit 29 or overtime decision circuit 31 outputs high level, the output of OR circuit 32 exports high level.Latch cicuit 23 accepts the output of OR circuit 32 and is transfused to high level, and the output of latch cicuit 23 exports high level.When exporting high level from latch cicuit 23, actuating of relay control element 22 becomes operate condition, thus makes electric current flow through relay coil 14c.When electric current flows through relay coil 14c, relay contact 14a, 14b open, thus block AC circuit 2.Further, light by LED12 the detection and the blocking of AC circuit 2 that notify to leak electricity.Action after electric leakage releasing is identical with the first execution mode.
In the first embodiment, the rise time of the voltage being applied to ZCT input terminal is measured.In this second embodiment, the time that the voltage being applied to ZCT input terminal exceedes threshold value is measured.In the third embodiment, the time that the rise time of voltage and voltage that are applied to ZCT input terminal exceed threshold value is measured.By importing first, second, third execution mode, do not need in the past be connected to noise filter on ZCT input terminal, that use in electric-leakage detection circuit in the past.Thereby, it is possible to miniaturization of the apparatus tackle the operating lag of detection of electrical leakage.
In addition, the utility model is not limited to the respective embodiments described above, in the scope of technological thought of the present utility model, obviously can carry out suitable change to each execution mode.Further, the quantity, position, shape etc. of said structure parts are not limited to above-mentioned execution mode, and enforcement the utility model can use suitable quantity, position, shape etc.In addition, in the various figures, identical label is given to identical structure member.
Claims (3)
1. an earth detector, this earth detector detects electric leakage according to the imbalance of the electric current flow through in AC circuit, and when detecting described electric leakage, block described AC circuit, it is characterized in that, this earth detector has:
Relay, it is connected in series on described AC circuit;
Zero phase current transformer, it detects the imbalance of the electric current flow through in described AC circuit, and is converted to voltage;
Rise time tester, it measures the rise time of described voltage; And
Rise time decision circuit, it is according to the rise time described in threshold determination,
This earth detector blocks described relay according to the judgement of the threshold value of described rise time decision circuit.
2. an earth detector, this earth detector detects electric leakage according to the imbalance of the electric current flow through in AC circuit, and when detecting described electric leakage, block described AC circuit, it is characterized in that, this earth detector has:
Relay, it is connected in series on described AC circuit;
Zero phase current transformer, it detects the imbalance of the electric current flow through in described AC circuit, and is converted to voltage;
Overtime tester, its more described voltage and reference voltage, measure the time that described voltage exceedes described reference voltage; And
Overtime decision circuit, it is according to threshold determination overtime,
This earth detector blocks described relay according to the judgement of the threshold value of described overtime decision circuit.
3. earth detector according to claim 2, is characterized in that,
This earth detector has rise time decision circuit,
This earth detector blocks described relay according to the judgement of the threshold value of described rise time decision circuit or described overtime decision circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520857057.3U CN205051332U (en) | 2015-10-30 | 2015-10-30 | Earth leakage detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520857057.3U CN205051332U (en) | 2015-10-30 | 2015-10-30 | Earth leakage detection device |
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| Publication Number | Publication Date |
|---|---|
| CN205051332U true CN205051332U (en) | 2016-02-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520857057.3U Expired - Fee Related CN205051332U (en) | 2015-10-30 | 2015-10-30 | Earth leakage detection device |
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| CN (1) | CN205051332U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20170288390A1 (en) * | 2016-04-01 | 2017-10-05 | Rohm Co., Ltd. | Electrical leakage detection circuit and electrical leakage breaker |
| CN107453322A (en) * | 2017-10-10 | 2017-12-08 | 沈阳市中兴防爆电器总厂有限公司 | A kind of explosion-proof controlling switch of local strange land double reset test self-insurance electric leakage |
| CN109524942A (en) * | 2017-09-18 | 2019-03-26 | 空中客车运营简化股份公司 | Electric link including electrical protection systems |
-
2015
- 2015-10-30 CN CN201520857057.3U patent/CN205051332U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20170288390A1 (en) * | 2016-04-01 | 2017-10-05 | Rohm Co., Ltd. | Electrical leakage detection circuit and electrical leakage breaker |
| CN107271827A (en) * | 2016-04-01 | 2017-10-20 | 罗姆股份有限公司 | Electric-leakage detection circuit and RCCB |
| US10658832B2 (en) * | 2016-04-01 | 2020-05-19 | Rohm Co., Ltd. | Electrical leakage detection circuit and electrical leakage breaker |
| CN109524942A (en) * | 2017-09-18 | 2019-03-26 | 空中客车运营简化股份公司 | Electric link including electrical protection systems |
| CN107453322A (en) * | 2017-10-10 | 2017-12-08 | 沈阳市中兴防爆电器总厂有限公司 | A kind of explosion-proof controlling switch of local strange land double reset test self-insurance electric leakage |
| CN107453322B (en) * | 2017-10-10 | 2019-12-24 | 沈阳市中兴防爆电器总厂有限公司 | Local-remote dual reset-test self-protection electric leakage explosion-proof control switch |
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Granted publication date: 20160224 |