CN2789926Y - ground fault circuit interrupter - Google Patents

Abstract

A ground fault circuit breaker comprises a base, a tripping mechanism and a control circuit, and also comprises a pair of static contact plates fixed on the base, a pair of load wiring terminal static contact plates fixed on the base, a pair of sliding frames and a pair of movable contact plates which are respectively fixed on the sliding frames and can elastically deflect, wherein one end of each movable contact plate is respectively connected with the corresponding conducting plate through a conducting strip, the conducting plates are respectively welded on a circuit board, and the sliding frames can be elastically and slidably arranged on a coil framework; the utility model discloses ground fault circuit breaker, it has when the reverse wiring protection, reverse wiring the panel jack of circuit breaker not electrified, the action is sensitive, the equipment is convenient, with low costs, interference immunity characteristics such as strong, and it makes whole ground fault circuit breaker's performance perfect more.

Description

Ground-fault interrupter

Technical field

The utility model relates to the device that a kind of the utility model relates to a kind of earth fault protection, especially a kind of uncharged ground-fault interrupter socket of panel jack when having backing protection function and reversal connection line.

Technical background

Because ground-fault interrupter can prevent effectively that the person from getting an electric shock and earth fault causes equipment and fire incident, thereby is subjected to extensive use.The ground-fault interrupter socket not only can connect load by the jack of panel; can connect load by the load wiring screw again; thereby in installing and using, tend to because of false wiring wiring of input power source end (Line) and load wiring end (Load) reversal connection; like this; if ground-fault interrupter does not have the function of reverse-connection protection; just be equivalent to one not with the common socket of creepage protection function, have influence on user's fail safe.Along with science and technology development, ground-fault interrupter is to high-performance, intellectuality, multifunctional direction development, and structurally all there is certain limitation in ground-fault interrupter in the past, thereby influences the performance of product or cause with high costs.Be that described ground-fault interrupter adopts electromagnetic release in the Chinese utility model patent of ZL.03243045. as the patent No., complex structure, the cost height, and utilize the tripping mechanism of magneto, aspect anti-interference, can be subjected to very big influence.As the patent No. is US 6; 813; though the described structurally simple relatively point of release unit in the United States Patent (USP) of 126 B2 with reverse-connection protection; but it is quite high that the hook manufacturing of its reset key both sides requires; do vibration after having deviation will cause hook incessantly can not reset or reset slightly slightly and will cause dropout; also have when making panel jack when not charged; the one end decide two moving contacts on the movable contact spring of other end resiliently deflectable be difficult to simultaneously with its described static contact on fixed contact contact simultaneously; produce the bigger electric arc influence life-span in the time of will causing break-make like this; or reset the back loose contact and have influence on the performance of product, even cause danger.

Summary of the invention

Main purpose of the present utility model provides a kind of also uncharged ground-fault interrupter of jack of panel when having reverse-connection protection and reversal connection line.

The technical solution of the utility model is: a kind of ground-fault interrupter, comprise pedestal, tripping mechanism, control circuit, it also comprises a pair of static contact that is fixed on the pedestal, the a pair of load wiring end static contact that is fixed on the pedestal, a pair of travelling carriage, the a pair of movable contact spring that is separately fixed at the resiliently deflectable on the travelling carriage, described movable contact spring one end links together by conductive strips and the conducting strip that passes magnetic test coil and neutral misconnection ground protection coil respectively, described conducting strip respectively by solid welding on circuit board, but described a pair of travelling carriage Elastic Sliding be positioned on the coil rack; At described static contact, when movable contact spring contacts, described static contact conducts respectively mutually with load wiring end static contact, and at described static contact, when movable contact spring is separated, described static contact disconnects respectively mutually with load wiring end static contact.

The utility model ground-fault interrupter, when it has reverse-connection protection, reversal connection line the panel jack of circuit breaker not charged, be active in one's movements, easy to assembly, characteristics such as cost is low, strong interference immunity; It makes the performance of whole ground-fault interrupter more perfect.

The reset lever bottom face is made planar end surface and is made its arc shaped opening greater than the locking plate in the described tripping mechanism, and when this ground-fault interrupter no power, reset lever just can't be passed locking plate and be realized the purpose that resets; And by a reset control circuit, when the ground-fault interrupter normal power-up, down by reset key, be about to touch when using locking plate in the reset lever bottom that links to each other with reset key, be arranged on the described reset control circuit of a spring conducting of reset key one side, make it add the controllable silicon that a triggering signal is come the energising of conducting control tripping coil artificially, allow tripping coil switch on and to produce an electromagnetic force and act on armature, overcome the elastic force of dropout spring after armature is stressed and move and drive coupled locking plate, make the bottom of reset lever pass locking plate, like this when the camber bayonet socket on the locking plate sticks in the draw-in groove on the reset lever, utilizing the elastic force of back-moving spring to drive reset lever moves with locking plate, locking plate drives balancing stand direction same with it again and moves, the elastic force ground that utilizes wedge surface on the balancing stand to drive to place its both sides and travelling carriage that movable contact spring is housed to overcome spring moves to make position, realizes the purpose that resets.

Disconnect mutually with load wiring end static contact by static contact, utilize separately the contact on it to come conducting, the also uncharged purpose of panel jack of ground-fault interrupter when realizing the reversal connection line.

When ground-fault interrupter of the present utility model is switched on, if with load end leak current fault occurs or add the test of fault current artificially, control circuit will trigger controllable silicon and make it conducting, the tripping coil energising that one end is linked to each other with controllable silicon, the electromagnetic force of utilizing tripping coil to produce acts on armature, realizes the purpose of rapid dropout open circuit.

Description of drawings

Fig. 1 is the stereo appearance figure of the utility model ground-fault interrupter;

Fig. 2 is the longitudinal sectional view of the utility model ground-fault interrupter when being in trip status;

Fig. 3 is a partial top view of the present utility model;

Fig. 4 is the cut-away view of the utility model ground-fault interrupter;

Fig. 5 is the part assembling exploded view of the utility model ground-fault interrupter;

Fig. 6 is the exploded view of the utility model ground-fault interrupter;

Fig. 7 is the utility model tripping mechanism rigging position exploded view;

Cross-sectional view when Fig. 8 is this real novel earthing fault breaker device trip status;

Partial sectional view when Fig. 9 is the utility model ground-fault interrupter trip status;

Cross-sectional view when Figure 10 is the utility model ground-fault interrupter closure state;

Partial sectional view when Figure 11 is this real novel earthing fault breaker closure state;

Figure 12 is the circuit theory diagrams of the utility model ground-fault interrupter; Wherein:

10, pedestal; 11, draw-in groove; 12, arc port; 13, travelling carriage; 14, travelling carriage; 15, static contact; 16, static contact; 17, load wiring end static contact; 18, load wiring end static contact; 19, power supply terminal; 20, central dividing plate; 21, power supply terminal; 22, movable contact spring; 23, movable contact spring; 24, conductive strips; 25, conductive strips; 26, conducting strip; 27, conducting strip; 28, lozenges; 29, lozenges; 30, loam cake; 31, load power source jack; 32, load earth jack; 33, reset key slide opening; 34, feeler switch slide opening; 35, annular groove; 40, installation sheet; 41, grounding base; 42, earthing screw; 50, feeler switch; 51, test spring; 52, test pieces; 53, test resistance; 60, reset key; 61, reset lever; 62, back-moving spring; 63, little spring; 64, lead-in wire; 70, radome; 71, coil rack; 72, tripping coil; 73, dropout spring; 74, armature; 75, locking plate; 76, balancing stand; 78, little spring; 79 wiring pin; 80, magnet ring skeleton; 81, neutral misconnection ground protection coil; 82, insulating barrier; 83, magnetic test coil; 90, circuit board; 101, fixed contact; 103, tension disc; 110, power supply wiring screw; 111, load wiring screw; 113, indicator-lamp cover; 114, indicating arm; 115, trip bolt; 701, moving contact;

Embodiment

Referring to each accompanying drawing, ground-fault interrupter comprises pedestal 10, tripping mechanism, control circuit, here, owing to pedestal 10, central dividing plate 20, loam cake 30 are fixed as one, therefore represents with pedestal 10 unifications.It also comprises a pair of static contact 15 that is fixed on the pedestal 10,16, the a pair of load wiring end static contact 17 that is fixed on the pedestal 10,18, a pair of travelling carriage 13,14, the a pair of travelling carriage 13 that is separately fixed at, the movable contact spring 22 of the resiliently deflectable on 14,23, described movable contact spring 22,23 1 ends are respectively by conductive strips 24,25 with the conducting strip 26 that passes magnetic test coil 83 and neutral misconnection ground protection coil 81,27 link together, described conducting strip 26,27 respectively by solid welding on circuit board 90, described a pair of travelling carriage 13, but 14 Elastic Sliding be positioned on the coil rack 71; At described static contact 15,16, when movable contact spring 22,23 contacts, described static contact 15,16 conducts respectively mutually with load wiring end static contact 17,18, at described static contact 15,16, when movable contact spring 22,23 is separated, described static contact 15,16 disconnects respectively mutually with load wiring end static contact 17,18.

Described tripping mechanism comprises tripping coil 72, be arranged at armature 74 in the tripping coil 72, withstand on dropout spring 73 on the armature 74, balancing stand 76, locking plate 75, be arranged at reset lever 61 in the balancing stand 76 slidably, have annular groove 35 on the described armature 74, armature 74 is connected with locking plate 75 slidably by annular groove 35, having arc port 12 on the locking plate 75 also is contained on the balancing stand 76 slidably, the both sides of described balancing stand 76 have lozenges 28,29, and this lozenges 28,29 contacts with described travelling carriage 13,14; Under described reset lever 61 and the state that locking plate 75 is connected, described static contact 15,16, movable contact spring 22,23 contact, and under the state that described reset lever 61 and locking plate 75 are separated, described static contact 15,16, movable contact spring 22,23 are separated.Have draw-in groove 11 on the described reset lever 61, it is that described locking plate 75 is inserted in the described draw-in groove 11 that described reset lever 61 is connected with locking plate 75.

Fig. 1 is the outside drawing of the utility model ground-fault interrupter; Wherein 40 is that installation sheet, 31 is that load power source jack, 32 is that load earth jack, 60 is that reset key, 50 is that feeler switch, 30 is that loam cake, 42 is that earthing screw, 110 is that power supply wiring screw, 10 is that pedestal, 111 is that load wiring screw, 113 is an indicator-lamp cover.This ground-fault interrupter not only can connect load but also can connect load by load wiring screw 111 by the load jack 31 on the loam cake 30.This outside drawing is the outside drawing of the ground-fault interrupter of rated current 15A, the utility model also comprises the ground-fault interrupter of other types, and the ground-fault interrupter of these types has tape light and two kinds of structures of tape light not, its operation principle all is the same, here mainly press the ground-fault interrupter explanation of electric current 15A tape light, other just do not explain in addition.

Position relation by the whole as can be seen ground-fault interrupter of Fig. 2, Fig. 3 each parts when the trip status.Each parts mainly is to be located by pedestal 10, central dividing plate 20, loam cake 30.The tripping mechanism that ground-fault interrupter of the present utility model provided, one end of radome 70 abuts against on the boss of pedestal 10 1 distolateral walls, the other end abuts against on the end face of coil rack 71, and coil rack 71 is to be positioned on the circuit board 90 by two wiring pin; Dropout spring 73 1 ends abut against on the end face of coil rack 71, and the other end is pressed on the end face of armature 74; And armature 74 other ends are connected with locking plate 75 slidably by the annular groove 35 on it; The other end of locking plate 75 is shaped on arc port 12 and is contained in slidably in the respective card slot on the balancing stand 76; The bottom of reset lever 61 is made into the plane and greater than the arc port on the locking plate 75 12, when the undesired energising of this circuit breaker, the bottom face of this reset lever 61 just can not pass the arc port 12 on the locking plate 75, play the effect of reverse-connection protection, have only when normal power-up, allow tripping coil 72 switch on and produce a momentary action masterpiece artificially by reset key 60 down and be used for armature 74, make elastic force that armature 74 overcomes dropout spring 73 in tow locking plate 75 move to direction away from balancing stand 76, allow the bottom face of reset lever 61 pass the arc port 12 on the locking plate 75 and make its arc port 12 be stuck in 11 li of draw-in grooves on the reset lever 61, utilize the restoring force of back-moving spring 62 to drive locking plate 75 and on balancing stand 76, move, realize the purpose that resets; The elastic force that overcomes test spring 51 by feeler switch 50 makes test pieces 52 contact the continuity test circuit with test resistance 53 down, gives fault current of circuit breaker artificially, realizes the dropout of tripping mechanism; Utilize the elastic force jack-up feeler switch 50 of test pieces 52, make it just equal with the upper surface of loam cake 30.Magnet ring skeleton 80 is positioned on the circuit board 90 by four wiring pin, dress magnetic test coil 83 and the neutral misconnection ground protection coil 81 middle insulating barriers 82 that are separated with thereon.Magnetic test coil 83 is made up of high initial permeability soft magnetism punching lamination, by the silicone grease bonding, plastics protection box is arranged outward between every, forms with the enamelled wire coiling.Neutral misconnection ground protection coil 81 constitutes around enamelled wire by wide temperature coefficient, high μ value, be coated with the ferrite of plastics protective layer outward.When making the reversal connection line, load jack on the loam cake 30 is not charged yet, static contact 15,16 is disconnected with load wiring end static contact 17,18 respectively, it can not directly be electrically connected, can only be electrically connected by the moving contact 701 on fixed contact on it 101 and the movable contact spring 22,23 separately and conduct electricity.Power supply inserts by binding post, by conducting strip 26,27 to conductive strips 24,25 arrive movable contact spring 22 again, 23, wherein conducting strip 26,27 respectively an end pass the magnet ring center and be welded on the circuit board 90, and the other end respectively with conductive strips 24,25 weld together, conductive strips 24,25 the other end respectively with movable contact spring 22,23 weld together, movable contact spring 22,23 are positioned in travelling carriage 13 respectively, on 14, utilization is placed on the coil rack 71 and an end is pressed on travelling carriage 13, the elastic force of the little spring 78 on 14 makes travelling carriage 13,14 with the movable contact spring 22 of having moving contact 701,23 remain on the dropout position.

As Fig. 4, shown in Figure 5, a pair of static contact 15,16 that has fixed contact 101 is fixed on the central dividing plate 20; The installation sheet 40 that has grounding base 41 and terminal screw 42 is positioned on the central dividing plate 20, utilizes loam cake 30 to compress it; The back-moving spring 62 that utilization is placed on the reset key 60 comes the conducting reset control circuit with switch leads 64 Elastic Contact in the reset control circuit, gives immediate current of tripping coil artificially, realizes resetting.

Fig. 6 is the exploded view of whole ground-fault interrupter; By figure we as can be seen, whole ground-fault interrupter mainly by pedestal 10, central dividing plate 20, loam cake 30, the installation sheet 40 that has grounding base 41 and earthing screw 42, a pair of movable contact spring 22,23 that has a moving contact 701, a pair ofly have the static contact 15,16 of fixed contact 101, a pair of load wiring end static contact 17,18, tripping mechanism, mechanism for testing and the control circuit that has fixed contact 101 formed; 19,21 is that power supply terminal, 103 is that tension disc, 110 is that power supply wiring screw, 111 is that load wiring screw, 90 is circuit board; All parts utilize four trip bolts 115 fastening after pressing diagramatic way and position assembling.Utilize the reset key slide opening 33 of loam cake and the cooperation of reset key 60 to do circumferential location, same feeler switch is also located by feeler switch 50 and cooperating of feeler switch slide opening 34.Utilization scribbles the indicating arm 114 of distinctive mark and makes the indicative function that resets, and this indicating arm is positioned on the travelling carriage 14, when reset of breaker, drives it by travelling carriage 14 and rests on reset position, realizes resetting purpose of indicating.

Fig. 7 is the exploded view of part tripping mechanism of the present utility model; Tripping mechanism herein mainly comprises: shield cover 70, coil rack 71, tripping coil 72, dropout spring 73, armature 74, locking plate 75, balancing stand 76, travelling carriage 13,14, little spring 78, wiring pin 79, be placed in movable contact spring 22,23 on the travelling carriage, be riveted on the moving contact 701 of movable contact spring; Utilize the elastic force of little spring 78 to make moving contact remain on trip status, utilize radome to improve anti-interference of the present utility model; The rigging position of whole release as shown in the figure.

Fig. 8, Figure 10 are represented is that ground-fault interrupter of the present utility model is in and threads off and the cross-sectional view during closure state, Fig. 9, shown in Figure 11 be that the utility model ground-fault interrupter is in and threads off and the partial sectional view when closed; Produce the effect of electromagnetic force during by tripping coil 72 energisings, can make armature 74 flexibly drive locking plate 75 and move around armature 74; Instantly by reset key 60 when reset lever 61 is about to touch locking plate 75, little spring 63 is electrically connected two lead-in wires 64 of the switch of reset control circuit, make the reset control circuit conducting, act on armature for artificially 72 1 immediate currents generation moment electromagnetic forces of tripping coil, making armature 74 tow out locking plate 75 allows reset lever 61 bottoms pass through, elastic force by dropout spring 73 makes the arc port 12 of 75 one ends of lock be stuck in 11 li of draw-in grooves on the reset lever 61 tightly, and utilize the restoring force of back-moving spring 62, driving locking plate 75 and balancing stand 76 moves on together, utilize the lozenges 28 of balancing stand 76 both sides, 29 promote travelling carriage 13,14 move to two side directions respectively, contact with fixed contact 101 until moving contact 701, i.e. breaker closing; One end of test pieces 52 is inserted in the central dividing plate 20 corresponding draw-in grooves, and its inboard abuts against the outside of static contact 16, the other end can be flexibly be installed in correspondence position on test resistance 53 contact; Instantly press feeler switch 50, when test pieces 52 is contacted with test resistance 53, give a fault current of ground-fault interrupter of the present utility model artificially, perhaps load end earth fault and fault current occur and reaches and establish when reaching threshold value, control circuit will allow tripping coil 72 moments energising produce an electromagnetic force and act on armature 74, allow armature 74 drag locking plate 75 rapidly, make the draw-in groove 11 of the arc port 12 disengaging reset lever 61 on the locking plate 75, utilize the elastic force of little spring 78 to push moving contact 701 rapidly open, realize the purpose of threading off rapidly.

Figure 12 is the typical ground-fault interrupter control circuit of a utility model schematic diagram; Diode D1～D4 constitutes rectification circuit, the alternating current of input is become the direct current of output, thereby usually also be referred to as DC circuit.The DC power supply anode is connected with filter resistance R2, and the R2 other end is connected with filter capacitor C5 one end, and the C5 other end is connected with ground, and the direct voltage about capacitor C5 two ends 26V is the DC power supply of electronic circuit.

Reset switch RESET, disconnect K, resistance R 4, capacitor C 6, resistance R 5, capacitor C 7, controllable silicon SCR 1, tripping coil J etc. constitute a reset control circuit; Wherein disconnect K links to each other with R2, and the disconnect K other end links to each other with R4, C6, and R4, the C6 other end link to each other with C7 with the controllable silicon SCR 1 control utmost point, R5, and in capacitor C in parallel with R5 7 of controllable silicon SCR 1 control utmost point serial connection, this electric capacity plays anti-interference effect; Controllable silicon SCR 1 anode links to each other with the end of tripping coil J, and the other end of tripping coil J links to each other with the ground-fault interrupter power end.Reset switch RESET one end is connected with power end Line, the other end is connected with load end Load, the contact that this reset switch RESET is connected with power end is ground-fault interrupter moving contact 701, and the contact that is connected with load end is ground-fault interrupter fixed contact 101; The power supply of control circuit links to each other with the power end of ground-fault interrupter, and when ground-fault interrupter was charged, the ground-fault interrupter control circuit was simultaneously charged.When disconnect K was switched on, DC power supply produced a triggering signal by capacitor C 6 chargings at R4, and this signal makes controllable silicon SCR 1 conducting, and tripping coil J is switched on artificially, and the electromagnetic force that produces a moment acts on armature 74.Cause reset switch RESET closure, promptly ground-fault interrupter is in reset mode.

The integrated circuit (this sentences RV4145 and illustrates) that integrated IC amplifying circuit is the ground-fault interrupter special use.

Pass the output shunt capacitance C0 of the magnetic test coil N1 of two power lines simultaneously, one end series capacitance C1, the C1 other end is connected in series with resistance R 3, the other end of R3 is connected with input 1 pin of IC, and another input 3 pin of the other end of magnetic test coil N1 and IC connect and compose transformer coupled differential input circuit.Wherein, R1 is that feedback resistance one end is connected with IC pin 1, and the other end is connected with IC output 7 pin, and R1 resistance size determines the IC multiplication factor, promptly determines the size of ground-fault interrupter dropout action failure current value.

Neutral misconnection ground protection coil N2, capacitor C 2, the capacitor C 3 of passing two power lines simultaneously constitute a neutral misconnection ground protective circuit; Neutral coil N2 two ends are in parallel with capacitor C 2, and the one end is connected with capacitor C 3, other end ground connection, and capacitor C 3 other ends are connected with IC output 7 pin.The sine-wave oscillator that is made of transformer coupled and corresponding frequency of oscillation N1, N2 is protected on neutral misconnection ground, when neutral misconnection ground phenomenon takes place, and this oscillator starting of oscillation; when amplitude reaches the IC threshold values; the 5 pin output triggering signal of IC, the release action, ground-fault interrupter disconnects.

Tripping coil J, controllable silicon SCR 2, capacitor C 4 etc. constitute a dropout control circuit; Wherein, the end of tripping coil J is connected with power supply (Line) end of ground-fault interrupter, the other end is connected with the anode of controllable silicon SCR 1, SCR2, the trigger electrode of controllable silicon SCR 2 is connected with IC triggering signal output 5 pin, controllable silicon SCR 2 minus earths, anti-interference capacitor C4 in parallel between controllable silicon SCR 2 trigger electrodes and ground.Magnetic test coil N1 detect two power lines that pass its center by electric current vector and, this vector and be zero during the fault-free electric current at ordinary times, when fault current, this vector and non-vanishing, when fault current increases to the 5mA left and right sides, the magnetic test coil secondary can induce the voltage signal about about 10mV, this signal amplifies through IC, when this signal reaches setting threshold (this threshold value is determined by resistance R 1), the 5 pin output triggering signal of IC makes controllable silicon SCR 2 conductings, and tripping coil J is charged, release is threaded off at the appointed time, and ground-fault interrupter disconnects.

Feeler switch (TEST), test resistance R0 constitute a test circuit; Wherein, test resistance R0 is connected with power end, and the R0 other end is connected with feeler switch (TEST), and the feeler switch other end is connected with the other end of load (Load).Test circuit is to provide fault current about 8mA to ground-fault interrupter, makes regular check on the ground-fault interrupter operating state.

Power end piezo-resistance Mov in parallel, when suddenly high voltage being arranged in the power supply, but the transient absorption high voltage plays a protective role.

When the reversal connection line, power supply links to each other with load (Load) end, like this before reset switch RESET does not have closure, control circuit is uncharged, again because the reset lever bottom face in this ground-fault interrupter is made the plane, and control circuit just can not pass the locking plate energising when not charged, and disconnect just can not closure.That is to say that in this case tripping coil can not produce a corresponding electromagnetic force and act on armature, so ground-fault interrupter just can not switch on, thereby reach backing protection function.

When in sum, ground-fault interrupter that the utility model provides has backing protection function, reversal connection line panel jack not charged, thread off rapidly, strong interference immunity, easy to operate, rational in infrastructure, low cost and other advantages.

Above-described only is essential characteristic of the present utility model, and the technical staff in this field can make multiple modification and/or change and should be considered as belonging to protection range of the present utility model described embodiment.

Claims (3)

1, a kind of ground-fault interrupter, comprise pedestal (10), tripping mechanism, control circuit, it is characterized in that: it also comprises a pair of static contact (15 that is fixed on the pedestal (10), 16), the a pair of load wiring end static contact (17 that is fixed on the pedestal (10), 18), a pair of travelling carriage (13,14), the a pair of travelling carriage (13 that is separately fixed at, the movable contact spring (22 of the resiliently deflectable 14), 23), described movable contact spring (22,23) end is respectively by conductive strips (24,25) with the conducting strip (26 that passes magnetic test coil (83) and neutral misconnection ground protection coil (81), 27) link together, described conducting strip (26,27) respectively by solid welding on circuit board (90), described a pair of travelling carriage (13,14) but Elastic Sliding be positioned on the coil rack (71); At described static contact (15,16), movable contact spring (22,23) when contacting, described static contact (15,16) conducts respectively mutually with load wiring end static contact (17,18), when being separated, described static contact (15,16) disconnects respectively mutually with load wiring end static contact (17,18) at described static contact (15,16), movable contact spring (22,23).

2, ground-fault interrupter according to claim 1, it is characterized in that: described tripping mechanism comprises tripping coil (72), be arranged at the armature (74) in the tripping coil (72), withstand on the dropout spring (73) on the armature (74), balancing stand (76), locking plate (75), be arranged at the reset lever (61) in the balancing stand (76) slidably, have annular groove (35) on the described armature (74), armature (74) is connected with locking plate (75) slidably by annular groove (35), having arc port (12) on the locking plate (75) also is contained on the balancing stand (76) slidably, the both sides of described balancing stand (76) have lozenges (28,29), this lozenges (28,29) with described travelling carriage (13,14) contact; Under described reset lever (61) and the state that locking plate (75) is connected, described static contact (15,16), movable contact spring (22,23) contact, under the state that described reset lever (61) and locking plate (75) are separated, described static contact (15,16), movable contact spring (22,23) are separated.

3, ground-fault interrupter according to claim 2, it is characterized in that: have draw-in groove (11) on the described reset lever (61), it is that described locking plate (75) is inserted in the described draw-in groove (11) that described reset lever (61) is connected with locking plate (75).

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