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CN101877474A - Intelligent arc-fault circuit interrupter - Google Patents

Intelligent arc-fault circuit interrupter Download PDF

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Publication number
CN101877474A
CN101877474A CN2010101911193A CN201010191119A CN101877474A CN 101877474 A CN101877474 A CN 101877474A CN 2010101911193 A CN2010101911193 A CN 2010101911193A CN 201010191119 A CN201010191119 A CN 201010191119A CN 101877474 A CN101877474 A CN 101877474A
Authority
CN
China
Prior art keywords
circuit
residual current
fault
current protecting
control circuit
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.)
Pending
Application number
CN2010101911193A
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Chinese (zh)
Inventor
李决龙
黄武杰
王旭
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huang Wujie
Li Juelong
Original Assignee
NAVAL ENGINEERING TECHNOLOGY MANAGEMENT PLA
BEIJING XIYU JIECHUANG TECHNOLOGY DEVELOPMENT Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NAVAL ENGINEERING TECHNOLOGY MANAGEMENT PLA, BEIJING XIYU JIECHUANG TECHNOLOGY DEVELOPMENT Co Ltd filed Critical NAVAL ENGINEERING TECHNOLOGY MANAGEMENT PLA
Priority to CN2010101911193A priority Critical patent/CN101877474A/en
Publication of CN101877474A publication Critical patent/CN101877474A/en
Pending legal-status Critical Current

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Abstract

The invention discloses an intelligent arc-fault circuit interrupter, which comprises a circuit interrupter, an electronic residual current protection module bottom shell, a standard residual current protection module shell upper cover, a tripping component fixed in an electronic residual current circuit interrupter module, a test component fixed in the electronic residual current circuit interrupter module, a detection component and a control circuit board, wherein the control circuit board mainly comprises a power circuit, a signal sampling circuit, an online programming interface circuit, a tripping component driving circuit, a resetting circuit, a reference voltage circuit and a special circuit module. In the invention, arc-fault circuit interrupter (AFCI) technology is modularized and then is implanted into the circuit interrupter, so an arc protection function is added on the basis that own functions of the circuit interrupter are preserved; and the intelligent arc-fault circuit interrupter performs tripping by a tripping device of the circuit interrupter, integrates the functions of arc fault detection, leakage fault detection, short-circuit fault detection, over-current fault detection and over-voltage detection, and can identify hazardous arcs and non-hazardous arcs by a software algorithm.

Description

A kind of intelligent arc-fault circuit interrupter
Technical field
This patent relates to a kind of release unit, is applied in the low-voltage power supply and distribution system.Can play forewarning function to the arc fault that produces because of loose contact, defective insulation in the power and distribution supply cable, also have short-circuit protection, overload protection, earth leakage protective, overvoltage protection and surge inhibit feature simultaneously.It belongs to low pressure for distribution safeguard protection field.
Background technology
At present; in the low-voltage distribution feed system, generally circuit breaker and the leakage protection module that can cut off the electricity supply automatically is installed all, its effect is: when short circuit, overload or leak current fault appear in the electric wiring rear end; but the trigger protection device is cut off the electricity supply, protection power consumption equipment and personal safety.Yet the arc fault that produces owing to contact or defective insulation in the electric wiring can not trigger these GPF (General Protection False device actions.Along with demands of social development, the continuous increase of power consumption, electric wiring are complicated day by day various, because of aging circuit, loosening insulation and the loose contact that produces happen occasionally, owing to the increase year by year of the event of fire that causes arc fault to cause.
Summary of the invention
The purpose of this invention is to provide a kind of with universal DZ47 type circuit breaker appearance similar; the protective device of the comprehensive more novel power supply-distribution system of function; it not only is short-circuited at loaded line, transships, can in time cuts off the electricity supply when leaking electricity; and overvoltage can take place in loaded line, during the arc fault that causes because of loose contact or defective insulation; also can in time cut off the electricity supply, be a kind of innovation of existing low pressure power and distribution supply cable safeguard protection means.
For achieving the above object, the present invention is realized by the following technical solutions:
A kind of intelligent arc-fault circuit interrupter comprises circuit breaker, electronic type residual current protecting module drain pan, standard residual current protecting module housing loam cake, is fixed on the interior trip assembley therefor of electronic type residual current circuit breaker module, is fixed on test suite, detection components, control circuit board in the electronic type residual current circuit breaker module; Described control circuit board mainly comprises power circuit, signal sample circuit, online programming interface circuit, trip assembley therefor drive circuit, reset circuit, reference voltage circuit and a specialized. circuit modules; Described intelligent arc-fault circuit interrupter, it with the AFCI technology modulesization after, implant circuit breaker, on the basis that keeps the function of circuit breaker own, increase the arc protection function; And utilize the circuit breaker tripping device to thread off.
Described standard DZ47 shape case circuit breaker, standard DZ47 type electronic type residual current protecting module drain pan, standard DZ47 type electronic type residual current protecting module loam cake connects by screw to each other; Described control circuit board and detection components are installed between electronic type residual current protecting module loam cake and the electronic type residual current protecting module drain pan; Test suite, trip assembley therefor are fixed in the drain pan.
Connect by wire bonds between described control circuit board and detection components, test suite, the trip assembley therefor.
Described standard circuit breaker power supply phase line lead-out terminal, zero line lead-out terminal link to each other with residual current protecting modular power source phase line lead-out terminal, zero line lead-out terminal respectively by two heavy gauge wires; heavy gauge wire passes residual current protecting module housing window; and pass the magnetic test coil of load module drain pan inner chamber, link to each other respectively with residual current protecting modular power source phase line lead-out terminal, zero-power line lead-out terminal from the residual current protecting inside modules again.
Between two thin wires of described connection power supply phase terminal and circuit breaker power output terminal that is connected the zero-power line terminal and control circuit board, a piezo-resistance in parallel; Described piezo-resistance is fixed on the control circuit board.
Described standard circuit breaker power supply phase line lead-out terminal, zero line lead-out terminal link to each other with control circuit board by thin wire, and described lead passes residual current protecting module housing window.
The signal output part of the magnetic test coil of described detection components links to each other by lead with the signal input part of control circuit board; The signal output part of described control circuit board links to each other by lead with trip assembley therefor; Test suite links to each other by lead with control circuit board, and described lead is all in the residual current protecting module housing.
Whether described control circuit partial failure, do not influence the operate as normal of standard circuit breaker.
Described detection components comprises difference mode signal magnetic test coil, common-mode signal magnetic test coil, detection of electrical leakage coil and and be connected the circuit breaker power output terminal and two heavy gauge wires of residual current protecting module terminals power output terminal, is connected two thin wires of circuit breaker power output terminal and control circuit board; The heavy gauge wire of described connection circuit breaker power supply output phase terminal and residual current protecting modular power source output phase terminal passes common-mode signal magnetic test coil and detection of electrical leakage coil; The heavy gauge wire of described connection circuit breaker power supply output zero terminal and residual current protecting modular power source output zero terminal passes common-mode signal magnetic test coil, detection of electrical leakage coil and difference mode signal magnetic test coil.
Described difference mode signal magnetic test coil is that epoxy shaped framework coil unshakable in one's determination, common-mode signal magnetic test coil are the permalloy shaped framework coil; Described electric leakage coil is a zero sequence current mutual inductor; Described coil is two pins, and described pin links to each other with control circuit board by lead respectively.
Described specialized. circuit modules comprises signal conditioning circuit, signal amplification circuit, signal processing circuit, voltage detecting circuit, internal storage and CPU circuit.Compared with the prior art, the present invention has following beneficial effect:
Because the present invention adopts above technical scheme,, and, can differentiate dangerous electric arc and non-dangerous electric arc by software algorithm so it has current collection arc fault, leak current fault, short trouble, over current fault, overvoltage fault detection capability characteristics.
It can automatic fault detection when normal power supply, and be implemented in the utmost point and cut off the electricity supply automatically in the short time.The present invention does not need under the situation of extra power supply when the electric power system normal power supply, with online mode above-mentioned fault message is discerned processing automatically after, directly drive the electromagnetic trip assembly, make its action, cut off the electricity supply rapidly, avoid the expansion of failure effect; After fault is got rid of, can the system restoration power supply according to the closing operation of normal circuit breaker.Installation method of the present invention is identical with the DZ47 type circuit breaker installation method of popularizing, and does not need additional power supply.When control circuit board all lost efficacy under limiting case, short circuit, the overload protection function of circuit breaker were unaffected.The present invention is an electromechanical integral switch assembly, can detect the generation of various faults in the power and distribution supply cable, and avoids reducing the loss of lives and properties because the burning that electric arc causes enlarges.
Description of drawings:
Fig. 1 is a contour structures schematic diagram of the present invention;
Fig. 2 is a decomposition texture schematic diagram of the present invention;
Fig. 3 is the physical circuit figure of control circuit board of the present invention;
Fig. 4 is an operation principle block diagram of the present invention;
Fig. 5 is a software flow pattern of the present invention.
Embodiment
As shown in Figure 1 and Figure 2; intelligent arc-fault circuit interrupter of the present invention mainly carries trip assembley therefor 204, DZ47 type residual current protecting module housing by DZ47 shape case circuit breaker 100, DZ47 type residual current protecting module housing 200, DZ47 type residual current protecting module housing and carries test suite 203, control circuit board 400, detection components 300, DZ47 type residual current protecting module housing loam cake 500 and constitute.
Described circuit breaker 100 is a standard DZ47 type circuit breaker; Comprise power output terminal 104,105, window 103, disconnect connecting rod 102.
Described residual current protecting module drain pan 200 is a standard DZ47 type residual current protecting module housing; Comprise carry trip assembley therefor 204, trip assembley therefor lead-in wire 209 and 210, carry that test suite forms 203, test suite lead-in wire 207 and 208, to keep dropout drive rod 202, power output terminal 205 and 206 is formed.Test suite and trip assembley therefor are fixed in the housing, link to each other with control board by lead.
Described detection components 300 is made up of heavy gauge wire 304 and 305, thin wire 306 and 307, detection of electrical leakage coil 301, common-mode signal magnetic test coil 302, difference mode signal magnetic test coil 303.Three magnetic test coils are installed in housing 211 inner chambers, between housing 211 and control circuit board 400.One end 304-2 of the heavy gauge wire 304 of described detection components links to each other with residual current protecting modular power source lead-out terminal 205 from housing 211 inside, and other end 304-1 passes housing window 201 and links to each other with circuit breaker power output terminal 104; One end 305-2 of the heavy gauge wire 305 of described detection components links to each other with residual current protecting modular power source lead-out terminal 206 from housing 211 inside, and other end 304-1 passes housing window 201 and links to each other with circuit breaker power output terminal 105; The thin wire 306 1 end 306-2 of described detection components 300 link to each other with the wiring board 402 of control circuit board 400, and other end 306-1 passes housing window 201 and links to each other with circuit breaker power output terminal 104; The thin wire 307 1 end 307-2 of described detection components 300 link to each other with the wiring board 402 of control circuit board 400, and other end 307-1 passes housing window 201 and links to each other with circuit breaker power output terminal 105.
Described control circuit board 400 is made up of circuit module 401, wiring board 402, online programming interface circuit 403, power circuit, reset circuit, reference voltage circuit, trip assembley therefor drive circuit.
Described residual current protecting module loam cake 500 is a standard DZ47 type residual current protecting module housing loam cake.
As shown in Figure 3, the concrete control circuit of intelligent arc-fault circuit interrupter of the present invention is: capacitor C 1 is connected across two links of described two thin wires 306,307 and wiring board 402; Piezo-resistance R1 is connected across two links of described two thin wires 306,307 and control circuit board; The link of resistance R 3 one termination thin wires 306 and wiring board 402, the ac input end of a termination rectifier bridge D1; The link of resistance R 2 one termination thin wires 307 and wiring board 402, another ac input end of a termination rectifier bridge D1; Capacitor C 2 one terminates at the direct current output cathode of rectifier bridge D1, an end ground connection; Rectifier bridge D1 direct current output negative pole ground connection; The direct current output cathode end of resistance R 4 one termination rectifier bridge D1,20 pins of a termination circuit module; The direct current output cathode of resistance R 5 one termination rectifier bridge D1, the collector electrode of a termination triode D2; Resistance R 6 one termination rectifier bridge D1 direct current output cathodes, a termination triode D2 base stage; Capacitor C 3 positive poles connect triode D2 emitter, an end ground connection; Capacitor C 4 one termination triode D2 emitters; 12 pins of triode D2 emitter connection circuit module.
Described thin wire 306 links to each other with an ac input end that meets rectifier bridge D5 with wiring board 402 links; Another ac input end of rectifier bridge D5 connects trip assembley therefor lead-in wire 210, rectifier bridge D5 direct current output negative pole ground connection; Trip assembley therefor lead-in wire 209 links to each other with the link of wiring board 402 with described thin wire 306; Voltage stabilizing didoe D6 negative pole connects the direct current output cathode of rectifier bridge D5, plus earth; One-way SCR D7 negative pole connects rectifier bridge D5 direct current output cathode, D7 plus earth; One-way SCR D7 control utmost point connecting resistance R8, R7, C5; R8 other end ground connection, C5 other end ground connection; Another terminating diode of R7 D3, D4 negative pole; Diode D3 cathode circuit module 7 pins; The anodal connection circuit module of diode D4 17 pins.
Described difference mode signal magnetic test coil follows lead-in wire to link to each other 1 pin of a termination circuit module 401,2 pins of other end connection circuit module 401 with wiring board 402 for 303 liang; 302 two lead-in wires of described common-mode signal magnetic test coil link to each other with wiring board 402,3 pins of a termination circuit module 401,4 pins of other end connection circuit module 402; Two lead-in wires of described detection of electrical leakage coil 301 link to each other with wiring board 402,19 pins of a termination circuit module 401,21 pins of other end connection circuit module 401.
Resistance R 13 is connected across between 19 and 21 pins of circuit module 401; 8 pins of resistance R 9 one termination circuit modules 401, another termination LED positive pole; The LED minus earth; Resistance R 12 is connected across between 11 and 10 pins of circuit module 401; Resistance R 10 is connected across between 11 and 6 pins of circuit module 401; 6 pins of resistance R 11 1 termination circuit modules 401, other end ground connection.
Resistance R 14 1 termination thin wires 306 link to each other with control circuit board, a termination test assembly lead 207, and test lead 208 and thin wire 307 link to each other on circuit board number.
5,6,10,11,22 of circuit module 401 links to each other with 1,2,3,4,5 pins of online programming interface 403 respectively.
14 pins of circuit module 401 link to each other with wiring board 402 links with described thin wire 306; 15 pins of circuit module 401 and described thin wire 307 and wiring board connect 402 and connect end and link to each other; 12 pins of circuit module 401 link to each other with triode D2 emitter; 18 pins of circuit module 401 link to each other with the direct current output cathode of rectifier bridge D1; 22 pin ground connection of circuit module 401.
As shown in Figure 4, the operation principle of intelligent arc-fault circuit interrupter of the present invention is: civil power 220V phase line of power and zero line insert the power input terminal of circuit breaker, the intelligent arc-fault circuit interrupter power output terminal connects loaded line, circuit breaker hand switch closure, when described intelligent arc-fault circuit interrupter is the loaded line power supply, be the control circuit board power supply, control circuit board is started working.Under the normal operation, the thin wire in the detection components is sent power supply into control circuit board, and in the time of for circuit supply, for circuit module provides voltage signal, the voltage detecting circuit in the circuit module is to voltage signal analysis, processing; Differentiate whether overvoltage of circuit by software, send the instruction of threading off, dropout drive circuit works to the dropout drive circuit if the overvoltage fault takes place, drive the tripping coil action and make the displacement of dropout drive rod, interlock short switch connecting rod makes circuit breaker tripping, cuts off the electricity supply.Three coils of detection components detect the load current signal of the heavy gauge wire of flowing through in real time, are sent to control circuit board by connecting lead-in wire, send into circuit module.The internal circuit of circuit module is done amplification to the signal of telecommunication of gathering; Analyze; Handle, by in computed in software, comparison, the judgement loaded line whether electric arc or leak current fault taking place.If have electric arc or leak current fault to take place in the judgement circuit, then send the instruction of threading off to the dropout drive circuit, the dropout drive circuit works drives the tripping coil action and makes the displacement of dropout drive rod, and interlock short switch connecting rod makes circuit breaker tripping, cuts off the electricity supply.When power input generation surge fault, the piezo-resistance part impulse current of can releasing fast, electrical equipment and equipment in the protection loaded line.Short circuit, overload protection function that circuit breaker itself has are not described in detail in this.
Be illustrated in figure 5 as intelligent arc-fault circuit interrupter software flow of the present invention.
The above is specific embodiments of the invention only, and protection scope of the present invention is not limited thereto, and any equivalent transformation based on technical solution of the present invention all belongs within protection scope of the present invention.

Claims (11)

1. an intelligent arc-fault circuit interrupter comprises circuit breaker, electronic type residual current protecting module drain pan, standard residual current protecting module housing loam cake, is fixed on the interior trip assembley therefor of electronic type residual current circuit breaker module, is fixed on test suite, detection components, control circuit board in the electronic type residual current circuit breaker module; Described control circuit board mainly comprises power circuit, signal sample circuit, online programming interface circuit, trip assembley therefor drive circuit, reset circuit, reference voltage circuit and a specialized. circuit modules; It is characterized in that: described intelligent arc-fault circuit interrupter, it with the AFCI technology modulesization after, implant circuit breaker, on the basis that keeps the function of circuit breaker own, increase the arc protection function; And utilize the circuit breaker tripping device to thread off.
2. ask 1 described intelligent arc-fault circuit interrupter according to right, it is characterized in that: described standard DZ47 shape case circuit breaker, standard DZ47 type electronic type residual current protecting module drain pan, standard DZ47 type electronic type residual current protecting module loam cake connects by screw to each other; Described control circuit board and detection components are installed between electronic type residual current protecting module loam cake and the electronic type residual current protecting module drain pan; Test suite, trip assembley therefor are fixed in the drain pan.
3. intelligent arc-fault circuit interrupter according to claim 1 is characterized in that: connect by wire bonds between described control circuit board and detection components, test suite, the trip assembley therefor.
4. intelligent arc-fault circuit interrupter according to claim 1; it is characterized in that: described standard circuit breaker power supply phase line lead-out terminal, zero line lead-out terminal link to each other with residual current protecting modular power source phase line lead-out terminal, zero line lead-out terminal respectively by two heavy gauge wires; heavy gauge wire passes residual current protecting module housing window; and pass the magnetic test coil of load module drain pan inner chamber, link to each other respectively with residual current protecting modular power source phase line lead-out terminal, zero-power line lead-out terminal from the residual current protecting inside modules again.
5. intelligent arc-fault circuit interrupter according to claim 4 is characterized in that: between two thin wires of described connection power supply phase terminal and circuit breaker power output terminal that is connected the zero-power line terminal and control circuit board, and a piezo-resistance in parallel; Described piezo-resistance is fixed on the control circuit board.
6. intelligent arc-fault circuit interrupter according to claim 1; it is characterized in that: described standard circuit breaker power supply phase line lead-out terminal, zero line lead-out terminal link to each other with control circuit board by thin wire, and described lead passes residual current protecting module housing window.
7. intelligent arc-fault circuit interrupter according to claim 1 is characterized in that: the signal output part of the magnetic test coil of described detection components links to each other by lead with the signal input part of control circuit board; The signal output part of described control circuit board links to each other by lead with trip assembley therefor; Test suite links to each other by lead with control circuit board, and described lead is all in the residual current protecting module housing.
8. according to claim 1 or 7 described intelligent arc-fault circuit interrupters, it is characterized in that: whether described control circuit partial failure, do not influence the operate as normal of standard circuit breaker.
9. according to claim 1 or 7 described intelligent arc-fault circuit interrupters, it is characterized in that: described detection components comprises difference mode signal magnetic test coil, common-mode signal magnetic test coil, detection of electrical leakage coil and and be connected the circuit breaker power output terminal and two heavy gauge wires of residual current protecting module terminals power output terminal, is connected two thin wires of circuit breaker power output terminal and control circuit board; The heavy gauge wire of described connection circuit breaker power supply output phase terminal and residual current protecting modular power source output phase terminal passes common-mode signal magnetic test coil and detection of electrical leakage coil; The heavy gauge wire of described connection circuit breaker power supply output zero terminal and residual current protecting modular power source output zero terminal passes common-mode signal magnetic test coil, detection of electrical leakage coil and difference mode signal magnetic test coil.
10. intelligent arc-fault circuit interrupter according to claim 9 is characterized in that: described difference mode signal magnetic test coil is that epoxy shaped framework coil unshakable in one's determination, common-mode signal magnetic test coil are the permalloy shaped framework coil; Described electric leakage coil is a zero sequence current mutual inductor; Described coil is two pins, and described pin links to each other with control circuit board by lead respectively.
11. intelligent arc-fault circuit interrupter according to claim 1 is characterized in that: described specialized. circuit modules comprises signal conditioning circuit, signal amplification circuit, signal processing circuit, voltage detecting circuit, internal storage and CPU circuit.
CN2010101911193A 2010-06-04 2010-06-04 Intelligent arc-fault circuit interrupter Pending CN101877474A (en)

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Application Number Priority Date Filing Date Title
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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102856887A (en) * 2011-06-28 2013-01-02 西门子公司 Resetting of disturbance arc protection device
CN102916415A (en) * 2011-08-05 2013-02-06 西门子公司 Arc fault protective switch with excess voltage protection
CN103376372A (en) * 2012-04-23 2013-10-30 福建俊豪电子有限公司 Three-phase AFCI detecting device
CN104067471A (en) * 2011-11-22 2014-09-24 施耐德电器工业公司 Device and method for protection from an electric arc
CN104782012A (en) * 2012-10-11 2015-07-15 本德尔有限两合公司 Differential current monitoring device with arc detection
CN105448617A (en) * 2014-09-18 2016-03-30 西门子公司 Low voltage circuit breaker
CN105845514A (en) * 2016-05-19 2016-08-10 上海电科电器科技有限公司 Arc fault detection circuit breaker
CN108400072A (en) * 2017-02-04 2018-08-14 西门子公司 Single-stage breaker
CN110729158A (en) * 2018-10-20 2020-01-24 陈泽 Hybrid arc ground fault circuit interrupter
TWI693763B (en) * 2018-11-06 2020-05-11 陳錫瑜 Improvement of dc control circuit breaker tripping system
CN112954987A (en) * 2021-04-12 2021-06-11 南通通明集团有限公司 Emergency cut-off device

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Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102856887B (en) * 2011-06-28 2016-12-21 西门子公司 The reset of interference arc preventer
CN102856887A (en) * 2011-06-28 2013-01-02 西门子公司 Resetting of disturbance arc protection device
CN102916415A (en) * 2011-08-05 2013-02-06 西门子公司 Arc fault protective switch with excess voltage protection
CN102916415B (en) * 2011-08-05 2017-03-01 西门子公司 There is the arc fault protective switch of overvoltage protection
CN104067471A (en) * 2011-11-22 2014-09-24 施耐德电器工业公司 Device and method for protection from an electric arc
CN103376372A (en) * 2012-04-23 2013-10-30 福建俊豪电子有限公司 Three-phase AFCI detecting device
CN104782012A (en) * 2012-10-11 2015-07-15 本德尔有限两合公司 Differential current monitoring device with arc detection
CN105448617A (en) * 2014-09-18 2016-03-30 西门子公司 Low voltage circuit breaker
CN112614749A (en) * 2014-09-18 2021-04-06 西门子公司 Low-voltage circuit breaker
CN105845514A (en) * 2016-05-19 2016-08-10 上海电科电器科技有限公司 Arc fault detection circuit breaker
CN108400072A (en) * 2017-02-04 2018-08-14 西门子公司 Single-stage breaker
CN108400072B (en) * 2017-02-04 2020-01-03 西门子公司 Single-stage circuit breaker
CN110729158A (en) * 2018-10-20 2020-01-24 陈泽 Hybrid arc ground fault circuit interrupter
CN110729158B (en) * 2018-10-20 2022-02-25 陈泽 Hybrid arc ground fault circuit interrupter
TWI693763B (en) * 2018-11-06 2020-05-11 陳錫瑜 Improvement of dc control circuit breaker tripping system
CN112954987A (en) * 2021-04-12 2021-06-11 南通通明集团有限公司 Emergency cut-off device
CN112954987B (en) * 2021-04-12 2022-11-11 南通通明集团有限公司 Emergency cut-off device

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Application publication date: 20101103