KR100521502B1 - Electric leakage circuit breaker with latch type - Google Patents

Abstract

An earth leakage circuit breaker having a remote control mechanism in the present invention, comprising: a handle which is rotated through an axis to cut off or return power of a power source side and a load side; A solenoid generating a momentary electromagnetic force when a surge current is applied to the driving coil; A magnetic sensitive body partially inserted into the inner hollow of the solenoid and moving back and forth by the electromagnetic force of the solenoid; Handle latch means interlocked with the magnetic sensitive body to move the handle and temporarily latch the moved handle through gear operation, and repeat the latch operation according to the application of a surge current; And a terminal movable body which is interlocked according to the operation of the handle latch means to form a closed circuit by being in physical contact with the fixed contacts of adjacent fixed terminals, thereby interlocking with the mechanism of the latch type circuit breaker. Latch that prevents power accidents by monitoring and controlling the power status remotely by reducing the power consumption and providing the current state of the earth leakage breaker to the communication network because it does not require continuous driving current during trip operation. Type automatic return electronic earth leakage breaker.

Description

Latch Type Automatic Return Electronic Earth Leakage Circuit Breaker {ELECTRIC LEAKAGE CIRCUIT BREAKER WITH LATCH TYPE}

The present invention relates to an earth leakage breaker, and more particularly, a latch capable of automatically performing a power off and a power return by communicating with the outside and remote control from the outside to be applied to a home automation or a home network. It relates to a type automatic return electronic earth leakage breaker.

In general, a home earth leakage breaker is installed in a home distribution board that constitutes a low voltage circuit (15 to 30 A) of AC 110 / 220V to prevent a human electric shock, a fire caused by a short circuit, and a safety accident due to overcurrent and a short circuit. It is used as a device.

As shown in FIG. 1, the conventional ground fault circuit breaker, when there is a leakage current in a state in which the handle is turned on, first detects the leakage current in the zero current transformer (PCB) which is the ground fault detection unit and then prints a printed circuit (PCB). Board) The detection signal is transmitted to a circuit part composed of electronic components in the case 15.

In addition, the circuit part in the PCB case 15 compares and amplifies the detected signal to apply a voltage to the trip coil assembly 16 which is an electronic device part, and the trip coil assembly 16 to which the voltage is applied is provided with the voltage applied thereto. It converts into the suction force with respect to (17), and sucks the armature 17 instantly.

Accordingly, the armature 17 pushes the trip bar 18 of the mechanism part to rotate the trip bar 18 about the hinge pin 19 so that the locking jaw 20 at the bottom of the trip bar 18 is nailed 21. When out of the top, the nail 21 is rotated about the hinge pin 24 of the upper by the pressing force of the pushing bar 23 holding the support pin 22 installed on the lower portion of the nail 21. Thus, the tip of the pushing bar 23 is slipped from the support pin 22 and out of the support pin 22.

At the same time, by the act of toggling the link 30 and the handle 27 due to the restoring force of the torsion spring 29 installed on the compression spring 26 below the crossbar 25 and the hinge shaft 28 of the handle 27. By moving the handle 27 to the cutoff position, the movable contact of the movable contact 31 is separated from the fixed contact of the power supply terminal 12a, which is a fixed contact, and the power is cut off.

In the conventional ground fault circuit breaker, a control circuit of the trip coil assembly 16, which is operated to cut off the power supply line when a ground fault occurs, is mounted on the electronic circuit board 15 to detect the amount of the ground fault current by the image current transformer of the control circuit. The trip coil assembly 16 is controlled to operate based on the detection result.

On the other hand, the earth leakage breaker is installed in home or industrial facilities to prevent accidents due to overcurrent and short-circuit in advance, but there is no structural device that can provide the cause of the accident in the event of an accident. In addition, in recent years, power meter reading, remote control, etc. cannot be performed through the above-described mechanical mechanism, so that a system modification of the earth leakage breaker is urgently required.

For example, in case of an emergency such as a fire, it is necessary to cut off electricity from the outside. However, in order to perform such a function, an earth leakage breaker with an on-line connection function that detects a power state and performs remote control according to the detection result is required. will be. Therefore, it is true that current leakage circuit breakers provide only a function of shutting off power when overloaded, and are regarded as a system function that is not appropriate to the flow of time.

The present invention was created to solve the above problems, and an object of the present invention is to provide a remote control function to the earth leakage breaker to remotely in case of emergency such as fire through communication means such as home network, infrared ray, telephone, mobile phone, etc. The present invention provides a latch type self-recovering electronic earth leakage breaker having a mechanism that can cut off power or restore power.

Another object of the present invention is to provide a latch type self-recovering electronic earth leakage breaker that can reduce the power consumption when remote control by implementing a mechanism that can latch the handle without the continuous drive current of the solenoid when the earth leakage breaker is turned on.

It is still another object of the present invention to minimize the wasted power of air conditioners, refrigerators, etc., as well as to prevent additional losses due to the continuous shutdown of the power supply, as it is possible to remotely return the earth leakage breaker when a momentary power failure occurs. A return electronic circuit breaker is provided.

Technical means of the present invention for achieving the above object, the earth leakage breaker having a remote control mechanism: a handle (110) rotated through the shaft to cut off or return to the power supply side and the load side; A solenoid 120 generating a momentary electromagnetic force when a surge current is applied to the coil 121; A magnetic sensitive body 130 partially inserted into the inner hollow of the solenoid 120 and moving back and forth by the electromagnetic force of the solenoid 120; A sensitizer head 140 coupled to the magnetic sensitizer 130 to be interlocked with the front and rear, and to rotate the handle 110 by pushing the lower end of the handle 110 and the rotating protrusion 143 formed on one side thereof; Is fixedly mounted on the lower end of the rotary projection 143 through the rotary shaft 151 has a rotary blade 153 having a plurality of rotary jaw 155 and the rotary projection 143 in accordance with the movement of the rotary projection 143 and A rotary cam 150 that is rotated by the contacting rotary jaw 155; One side is fixedly installed at the lower end of the rotary cam 150 to be in close contact with the corner of the rotary cam 150 to push the handle 110, which is elastically pushed at a predetermined angle and temporarily moved to the locking step 165 formed on one side. A handle stopper 160; And a terminal movable body in which a movable contact 171 formed on one side of the movable contact 171 interlocked with the front and rear movement of the sensitive head 140 is in physical contact with the fixed contact 181 of an adjacent fixed terminal body 180 to form a closed circuit ( 170).

In addition, when the electromagnetic force of the solenoid 120 disappears by installing a first elastic body 135 between the solenoid 120 and the magnetic sensitive body 130 or the sensitive head 140, the magnetic sensitive body 130 Is configured to return to the original position, the magnetic force sensitive body 130 and the sensitive head 140 is fastened or formed integrally with each other by a connecting pin, the rotation on one side of the lower end of the sensitive head 140 The rotary protrusion 143 which contacts the rotary blade 153 of the cam 150 to rotate the rotary blade 153, and the handle push piece 145 which moves the handle 110 are formed, respectively.

In addition, the rotary cam 150 is formed in a polygonal plate shape, the rotary blade 153 for pushing the handle stopper 160 using the corner angle, and is formed at a predetermined angle intervals on one surface of the rotary blade 153 is It consists of a rotating jaw 155 in contact with the rotary projection 143 of the sensitive head 140 to rotate the rotary blade 153, the rotary jaw 155 is 45 ° on one surface of the rotary blade 153 It is preferable to install eight at intervals.

The handle stopper 160 is pushed to the lower end by the corner angle of the rotary blade 153 of the rotary cam 150, but is configured to latch the bottom surface of the handle 110 rotated by a predetermined angle to the locking step 165. .

Lastly, when the second elastic body 175 is installed between the terminal movable body 170 and the adjacent fixed terminal body 180, the handle 110 is latched on the latching jaw 165 of the handle stopper 160. The handle 110 remains latched even without the driving current of the solenoid 120. When the driving current is applied to the solenoid 120 again, the handle 110 is returned to its original position by the restoring force of the second elastic body 175. FIG. It is preferable to construct.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

Figure 2 is an internal coupling diagram showing the earth leakage breaker according to the present invention, Figure 3 is an exploded perspective view showing the main portion of the electronic earth leakage breaker according to the present invention.

The earth leakage breaker includes a handle 110, a solenoid 120, a magnetic sensitive body 130, a handle latch means 140 to 160, a terminal movable body 170 and a circuit board 200, the handle latch means Is composed of the sensitive head 140, the rotary cam 150, the handle stopper 160, the respective devices are mutually coupled and installed at a predetermined position in the case (101).

The handle 110 is a switch bar that is rotated through the shaft 111 to cut off or return power of the power supply side and the load side, and the solenoid 120 is instantaneous when a surge current is applied to the driving coil 121. The coil is wound on the outer circumferential surface of the cylindrical metal generating the electromagnetic force, the magnetic sensitive body 130 is inserted into the inner hollow 125 of the solenoid 120 is configured to move back and forth by the electromagnetic force of the solenoid 120 The handle latch means 140 to 160 operates in conjunction with the magnetic force sensitive body 130 to move the handle 110 and to temporarily latch the moved handle 110 through gear operation to apply surge current. Therefore, the latch operation is repeated.

In addition, the handle latch means 140 to 160, coupled with the magnetic force sensitive body 130 is interlocked with the front and rear, while rotating the handle 110 by pushing one side of the handle 110 and the rotation projection 143 on one side The sensitizer head 140 formed and fixedly mounted to the case 101 through the rotating shaft 151 at the lower end of the rotating protrusion 143 have a plurality of radial rotating jaw 155 and the rotating protrusion 143. Rotating cam 150 is configured to rotate by the rotating jaw 155 in contact with the rotating projection 143 in accordance with the movement, and one side is fixed to the case 101 at the lower end of the rotating cam 150, but rotating blade ( The handle stopper 160 is configured to be fixed to the handle 110 which is in close contact with the edge of the 153 elastically rotated at a predetermined angle and temporarily moved to the locking jaw 165 formed on one side.

In addition, the terminal movable body 170 is interlocked according to the forward and backward movement of the sensitive head 140, and the movable contact formed on one side is physically contacted with the fixed contact of the adjacent fixed terminal body 180 so that the closed circuit is configured.

In addition, a first elastic body 135 is installed between the solenoid 120 and the magnetic sensitive body 130 or the sensitive head 140 so that the solenoid 120 and the magnetic sensitive body 130 interact with each other. When configured to be repulsed, the magnetic sensitive body 130 and the sensitive head 140 is fastened or integrally formed by a connecting pin 141, the lower side of the sensitive head 140 is the The rotary protrusion 143 which contacts the rotary blade 153 of the rotary cam 150 to rotate the rotary blade 153, and the handle push piece 145 for moving the handle 110 are formed, respectively.

In addition, the rotary cam 150 is formed in a polygonal plate shape, the rotary blade 153 for pushing the handle stopper 160 using the corner angle, and is formed at a predetermined angle intervals on one surface of the rotary blade 153 is It consists of a rotating jaw 155 that is in contact with the rotating projection 143 of the sensitive head 140 to rotate the rotary blade 153, it is preferable that the rotation jaw 155 is installed at intervals of 45 8 eight. The corner angle of the rotary blade 153 is formed between the adjacent rotary jaw 155 is formed higher than the rotary jaw 155.

The handle stopper 160 is pushed to the lower end by the corner angle of the rotary blade 153 of the rotary cam 150, so as to latch the lower end 115 of the handle 110 rotated by a predetermined angle to the locking step 165. When the handle 110 is latched to the latching jaw 165 of the handle stopper 160, the handle 110 is held in the latched state without the driving current of the solenoid 120, and the solenoid 120 is again provided. When the driving current is applied, the handle 110 is configured to return to its original position by the restoring force of the second elastic body 175.

Finally, a second elastic body 175 is provided between the terminal movable body 170 and the fixed terminal body 180.

That is, as shown in Figure 3, the handle 110 has a substantially rectangular shape, the solenoid 120 is inserted into the hollow portion 112 of the handle 110, the inserted solenoid 120 is the case 101 Fixed).

A handle knob 117 is formed at an upper end of the handle 110, a rotation shaft 111 is formed at an intermediate point of the handle 110, and the rotation shaft 111 is fixedly installed at the side of the solenoid 120. It is.

The inner surface of the solenoid 120 has a cylindrical hollow portion 125 is formed, the outer peripheral surface of the drive coil 121 is wound, the hollow portion 125 of the solenoid 120 cylindrical magnetic sensitive body 130 Will be inserted.

The magnetic sensitive body 130 inserted into the hollow portion 125 of the solenoid 120 is moved back and forth in response to the electromagnetic force of the solenoid 120, integrally or connected to the magnetic sensitive body 130 or the connecting pin 141 The sensitive head 140 is fastened as well.

Then, when the first elastic body 135 is a spring is inserted into the outer peripheral surface of the magnetic sensitive body 130 and the magnetic sensitive body 130 is moved to the solenoid 120 side and the magnetic force is lost in the solenoid 120 It is configured to return the sieve 130 to its original position.

The sensitive head 140 coupled to one side of the magnetic sensitive body 130 has a variety of functions are installed at the lower end, the sensitive head 140 is the lower end of the body coupled with the magnetic sensitive body 130 Rotating projection 143 for rotating the rotary cam 150, and the rotation projection 143 is spaced apart from the predetermined interval but the handle push piece 145 for pushing the lower end of the handle 110, the handle 110 The lower end is formed with a terminal push piece 113 in contact with the terminal movable body 170 to move the terminal movable body 170 back and forth according to the movement of the sensitive head 140.

In addition, the rotating cam 150 which is rotated in contact with the rotating protrusion 143 of the sensitive head 140 is fixed to the case 101 through the rotating shaft 151, and on one side of the rotating cam 150 There is a rotary blade 153, one side of the rotary blade 153 is formed with a rotary jaw 155 radiated from the center at a predetermined angle. Therefore, as the rotary jaw 155 of the rotary blade 153 and the rotary projection 143 of the sensitive head 140 are in contact with each other and the rotary jaw 155 moves and rotates according to the forward and backward movement of the rotary protrusion 143. Rotating blade 153 is to be rotated.

The rotary blade 153 is formed in an octagonal plate shape having an octagonal corner angle is configured to push the lower edge of the corner by pressing the handle stopper 160 when the rotary blade 153 is rotated.

The rotating shaft 161 formed at one side of the handle stopper 160 is fixed to the case 101, and the other side of the handle stopper 160 has a locking jaw 165 formed thereon. When moving to the top handle stopper 160 is pushed to the bottom by the corner angle of the rotary blade 153, when the corner angle of the rotary blade 153 passes the handle stopper 160, the handle stopper 160 back to the top In this case, the locking step 165 of the handle stopper 160 is latched by walking the lower end 115 of the handle 110.

In addition, as the handle 110 moves, the terminal movable body 170 moves to physically contact the terminals of the fixed terminal body 180, and is configured to be in an on state.

Therefore, even when the driving current is not applied to the solenoid 120, the handle 110 is caught on the locking step 165, and the ground circuit breaker is maintained on.

On the other hand, the circuit board 200 is mounted on the inside of the circuit breaker, the circuit board 200 is composed of the circuits as shown in Figure 4, but is not limited to this application example. An external current transformer 201 mounted inside the circuit breaker for detecting the video current of the primary power supply line, and a remote trip drive for turning on / off the mechanical open circuit and the closed circuit of the ground fault circuit breaker with a momentary current according to an external command. A coil 123 and a trip driving coil 121 for operating a remote trip driving coil 123 to sense an unbalanced current change from the image current transformer 201 and to control power interruption of the ground fault circuit breaker in response thereto; And a trip operation detecting unit 207 for detecting an operation state of the remote trip driving coil 123 and converting it into a signal for remote transmission, and in case of disconnection or surge voltage of the primary power line. A switching unit 209 for transmitting a trip control signal to a remote trip driving coil 123, a brain surge removing unit 217 for removing surges from AC power applied from the outside, and the brain surge removing unit 217 Rectification unit 215 for rectifying the power output through the DC power source, a high voltage generator 213 for boosting the low voltage output through the rectifier 215, and is output through the high voltage generator 213 After charging the voltage, the high voltage charging unit 211 for providing the driving voltage of the switching unit 209 and power supply to the input side of the high voltage generation unit 213 are detected and remotely controlled even when the system is out of power. Transmission for receiving the operation state of the switching unit 209 including the power failure detection unit 221, the tripping operation detection unit 207 and the power failure detection unit 221 for transmission to a predetermined protocol. Communication to signal A fisherman 223 and a communication unit 225 for wirelessly transmitting the detection information of the communication control unit 223. Here, the video current transformer 201 uses an annular troidle, and implements the present invention. For example, 10mA ~ 100mA current is detected in response to the inflow current amount of 30A ~ 60A of the annular troidle. In addition, the charging unit 219 is configured in parallel between the output terminal of the rectifying unit 215 and the input terminal of the high voltage generating unit 213, and the charging unit 219 is configured as a secondary battery (secondary battery) or the charging unit ( When the power supply is connected to the auxiliary power supply 219, the same function as the UPS is performed, and the state of the power failure, short circuit, over current, and leakage is notified to the outside through the communication unit 225, and the driving coil 123 for the remote trip even during a power failure. Is to make this work.

The communication control unit 223 and the communication unit 225 may be provided with a connector (not shown) to be connected from the outside of the earth leakage breaker, the identification code '227' is a test switch, the rectifier 215 is Of course, the driving coil 121 for the trip and the driving coil 123 for the remote trip are the driving coils 121 wound around the outer circumferential surface of the solenoid 120.

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Looking at the operation of the earth leakage breaker of Figures 2 to 3 configured as described above are as follows.

When the surge current is instantaneously applied to the drive coil 121 wound on the outer circumferential surface of the solenoid 120, the solenoid 120 generates a strong electromagnetic force to attract the magnetic sensitive body 130, at this time the magnetic sensitive body 130 The sensitive head 140 connected to starts moving in the direction of movement of the magnetic sensitive body 130, that is, the solenoid 120 side.

The sensitizer head 140 moves in the direction of movement of the magnetic sensitizer 130, and the rotation protrusion 143 formed at the lower end of the sensitizer head 140 is connected to the rotary jaw 155 of the rotating cam 150. While pushing the rotary cam 150 to rotate at a predetermined angle (about 45 °), the handle push piece 145 formed at one end of the sensitive head 140 pushes the lower end 115 of the handle 110 to handle 110 Rotated).

As the handle 110 is rotated, the handle 110 pushes the terminal movable body 170, and the terminal movable body 170 pushes on the handle 110 to fix the movable contact 171 attached to the terminal movable body 170. In close contact with the fixed contact 181 of the terminal body 180 to make a closed circuit state to switch the earth leakage breaker to the on state (power supplied to the load is cut off).

In addition, the handle stopper 160 is pushed to the bottom by the corner angle of the rotary blade 153 according to the rotation angle of the rotary cam 150, in order to maintain the sanction operation, the octagonal by the tension spring force of the handle stopper 160 By maintaining a horizontal angle parallel to the rotation angle of the cam to fix the lower end of the rotated handle 110 to the locking jaw 165 to form a continuous closed circuit even without the drive current of the solenoid 120.

This operation is all strokes are made when the magnetic sensitive body 130 of the solenoid 120 is pulled once, the magnetic sensitive body 130 and the sensitive head 140 of the solenoid 120 is the electromagnetic force of the solenoid 120 If there is no, the return to the original position due to the restoring force of the first elastic body 135 attached to the magnetic sensitive body 130 again.

On the other hand, the operation of turning off the earth leakage breaker again pulls the magnetic sensitive body 130 with the instantaneous surge current to move the rotating cam 150 one space while moving the magnetic sensitive body 130, the rotary cam 150 When the corner angle of the rotary blade 153 reaches the handle stopper 160 when it is rotated, the handle stopper 160 is pushed by the corner angle formed on the rotary blade 153 of the rotary cam 150 to move down, accordingly Due to the restoring force of the second elastic body 175 installed on the terminal movable body 170 as the locking jaw 165 of the handle stopper 160 is released from the handle 110, the handle 110 is momentarily pushed to attach the terminal movable body 170. The movable contact 171 is separated from the terminal 181 of the fixed terminal body 180 to maintain the circuit breaker off state (power supply to the load).

Although specific embodiments of the present invention have been described and illustrated above, it is obvious that the functions of each component may be the same, but may be variously modified. Such modified embodiments should not be understood individually from the technical spirit or the prospect of the present invention, but should fall within the claims appended to the present invention.

Therefore, the electronic earth leakage breaker according to the present invention is capable of remote monitoring and remote control to prevent power failure in advance, and implements a mechanism to latch the handle without the continuous driving current of the solenoid when the earth leakage breaker is turned on. The power consumption in remote control can be reduced.

In addition, when the momentary power failure occurs, the earth leakage breaker can be remotely restored, thereby minimizing the power consumption of air conditioners and refrigerators, and preventing additional losses such as food corruption due to the continuous interruption of the power supply. .

1 is a cross-sectional view showing a conventional earth leakage breaker,

Figure 2 is an internal coupling diagram showing an electronic earth leakage breaker according to the present invention,

Figure 3 is an exploded perspective view showing the main portion of the electronic earth leakage breaker according to the present invention,

4 is a circuit block diagram showing a control device of an earth leakage breaker according to the present invention.

Explanation of symbols on the main parts of the drawings

100: earth leakage breaker 110: handle

111: rotating shaft 112: hollow part

115: handle lower portion 120: solenoid

121: driving coil (trip coil) 125: hollow part

130: magnetic sensitive body 135: first elastic body (spring)

140: induction head 143: rotating projection

145: handle push piece 150: rotary cam

151: rotating shaft 153: rotary blade

155: rotary jaw 160: handle stopper

165: locking step 170: terminal movable body

171: movable contact (terminal) 175: second elastic body (spring)

180: fixed terminal 181: fixed contact (terminal)

200: circuit board

Claims (9)

In a circuit breaker with a remote control mechanism: A handle which is rotated through the shaft to shut off or return power of the power supply side and the load side; A solenoid generating a momentary electromagnetic force when a surge current is applied to the driving coil; A magnetic sensitive body partially inserted into the inner hollow of the solenoid and moving back and forth by the electromagnetic force of the solenoid; Handle latch means interlocked with the magnetic sensitive body to move the handle and temporarily latch the moved handle through gear operation, and repeat the latch operation according to the application of a surge current; And A latch-type automatic return electronic leakage breaker comprising: a terminal movable body which is interlocked according to the operation of the handle latch means to form a closed circuit by physically contacting a fixed contact of an adjacent fixed terminal body. . The method according to claim 1, The handle latch means, A sensitizer head which is coupled to the magnetic sensitizer and is interlocked with the front and rear, and rotates the handle by pushing a lower end of the handle, and a rotating protrusion is formed at one side; A first elastic body for returning the magnetic sensitive body to its original position when the electromagnetic force of the solenoid disappears; A rotating cam fixedly mounted on a lower end of the rotating protrusion through a rotating shaft, the rotating cam having a plurality of rotating jaws and rotating by a rotating jaw in contact with the rotating protrusion according to the movement of the rotating protrusion; A handle stopper having one side fixedly installed at a lower end of the rotating cam, which is in close contact with an edge of the rotating cam and is elastically pushed at a predetermined angle to hang the handle temporarily moved to a locking jaw formed at one side; And And a second elastic body for returning the handle latched to the handle stopper to its original position when a surge current is applied to the solenoid. The method according to claim 2, The first elastic body is a latch type automatic return electronic circuit breaker, characterized in that the spring is installed on the outer peripheral surface of the magnetic sensitive body between the solenoid and the sensitive head. The method according to claim 2, The magnetic sensitive body and the sensitive head is latched type automatic return electronic circuit breaker, characterized in that fastened or integrally formed by a connecting pin. The method according to claim 2, A rotary protrusion on one side of the lower end of the sensitive head, in contact with the rotary blade of the rotary cam to rotate the rotary blade; And a handle push piece for contacting the lower end of the handle to rotate the handle. 2. The method according to claim 2, The rotary cam is formed in a polygonal plate shape, the rotary blade for pushing the handle stopper using the corner angle; And a rotating jaw formed on one surface of the rotary blade at a predetermined angle interval to be in contact with the rotary protrusion of the sensitive head to rotate the rotary blade. The method according to claim 6, The rotary jaw is a latch-type automatic return electronic circuit breaker, characterized in that eight installed at intervals of 45 °. The method according to claim 2, The handle stopper is pushed to the lower end by the corner angle of the rotary blade latch-type automatic return electronic leakage breaker, characterized in that configured to latch the lower surface of the handle rotated by a predetermined angle. The method according to claim 2, The second elastic body is installed between the terminal movable body and the fixed terminal body, when the handle is latched on the latching jaw of the handle stopper is a spring to return the handle to its original position by the elastic force when the drive current is applied to the solenoid again Latch type self-recovering electronic earth leakage breaker.