CN203521788U - Leakage and overcurrent protection socket - Google Patents

Abstract

The utility model discloses a leakage overcurrent protection socket in the field of circuit components, including socket panel and the circular telegram subassembly that the lock is fixed in socket panel bottom, socket panel surface is equipped with the button that resets, test button and a set of socket more than, this circular telegram subassembly comprises the protecting sheathing of taking accommodation space and the detection circuitry board that holds in the protecting sheathing inside, resetting means and trip gear, electric leakage detection IC, overcurrent protector, the silicon controlled rectifier, solenoid and two sets of mutual-inductors are connected to the electric property on this detection circuitry board, it is accurate sensitive to detect the leakage current signal when electric leakage appears, the precision improves greatly, can set up the range value of leakage current and overcurrent value respectively as required, can guarantee completely within the safety range; the tripping reaction time is fast and is not more than 0.08S at most, so that the personal and property safety is effectively protected; a plurality of jacks are arranged on the same socket, so that independent power utilization of a plurality of electric appliances is met, mutual interference is avoided, and the normal use of other circuits is not influenced by the circuit fault of a single line.

Description

Leakage and overcurrent protection socket

technical field

The utility model relates to the field of circuit components, in particular to a socket, in particular to a leakage and overcurrent protection socket.

Background technique

Socket refers to the insertable seat of one or more circuit connections, can insert various wiring by it, is convenient to connect with other circuits. The power socket is an electrical device that provides a power interface for household appliances, and it is also an electrical accessory that is used more in residential electrical design. It has a very close relationship with people's lives. The traditional socket is used for connecting multiple electrical appliances, and the leakage protection value is generally 30MA. If the value is too small, the sum of the leakage current of multiple electrical appliances is easily greater than the protection value of the protector, and it will be disconnected frequently, affecting normal power consumption, but it is safe If the leakage current is below 6mA, traditional protectors cannot effectively protect personal and property safety, and electrocution often occurs. The traditional over-current relay switch reacts slowly. When the current in the line just exceeds the rated value of the over-current relay, the over-current relay will not be triggered. Usually, the current in the line needs to be much greater than the rated value of the over-current relay. The overcurrent relay is activated to disconnect the circuit. Because of its slow response, the circuit cannot be disconnected after more accidents occur, and it cannot really play a protective role; the traditional short-circuit switch has a slow response time and all power is cut off in the event of a short-circuit fault. , it is difficult to find out the cause of the failure. Therefore, there is a need for a socket that can realize leakage, overcurrent, short circuit protection and guarantee one-to-one power consumption to realize safe power consumption.

Utility model content

The purpose of this utility model is to provide a socket that realizes leakage, short circuit, and overcurrent protection in view of the deficiencies of the prior art, through the cooperation of the overcurrent protector and the tripping device to quickly disconnect the circuit and improve the response accuracy, a pair of One power consumption can effectively identify the faulty circuit, which is convenient for repair and maintenance.

In order to effectively solve the above problems, the technical scheme adopted by the utility model is as follows:

The products of this utility model include similar products such as wall sockets, ground plugs and row plugs.

Leakage and overcurrent protection socket, including the socket panel and the energized components fastened and fixed on the bottom of the socket panel. The surface of the socket panel is provided with a reset button, a test button and more than one set of sockets. The detection circuit board 1, the detection circuit board 2, the reset device and the tripping device are formed inside the protective shell, and a middle cover is arranged above the detection circuit board, and the middle cover is located between the detection circuit board 2 and the socket panel, and the detection circuit board One is located on the surface of the middle cover, and the surface of the detection circuit board is provided with a test switch, a rectifier diode and a drop resistor, and the bottom of the test button is provided with a test return spring and a test conduction metal sheet for conducting the test switch, so that the test The return spring is located between the detection circuit board 1 and the test button. After the test button is pressed, the test conduction metal sheet is in contact with the test switch. After the test button is released, the test conduction metal sheet is tested under the resilience of the test return spring. It is separated from the test switch; a pair of socket copper sheets corresponding to the socket are fixed on the middle cover, a pair of fixed contacts are riveted at the middle end of the socket copper sheet, and input live wire terminals that are connected to the socket copper sheet are respectively provided on the side of the protective shell and the output zero line terminal; the reset device includes a reset button, a reset spring and a reset link. At the bottom of the middle cover, the return spring is located between the reset button and the middle cover. The detection circuit board 2 is electrically connected with leakage detection IC, rectifier diode 2, resistors, capacitors, varistors, overcurrent protectors, thyristors , electromagnetic coil and two sets of mutual inductors, and a switch plate for triggering the conduction of the silicon controlled rectifier is provided on the second surface of the detection circuit board to make the electromagnetic coil work. The transformer is used to detect the leakage current signal and send it to the leakage detection IC after rectification and filtering For analysis, the central hole of the transformer is pierced with a pair of input moving pieces with resilience, and the input moving pieces extend forward to both sides of the reset connecting rod, and a moving contact corresponding to the fixed contact is riveted at the end of the input moving piece, so that The moving contact is located directly below the static contact; the leakage detection IC is used to analyze and compare the size standard of the leakage current signal value. When the leakage current signal value is less than the set value of 4.0mA, the output is low level, and the leakage current signal value is Output high level at 5mA-6mA, trigger the conduction of the thyristor; the thyristor is used to control the power on and off of the electromagnetic coil, and when the thyristor is on, the electromagnetic coil is energized to generate a magnetic field; the center of the electromagnetic coil is installed with a magnetic field The push rod of force action, the push rod is parallel to the detection circuit board 2. When the electromagnetic coil is energized, a magnetic field force is generated to push the push rod forward, and the trip piece advances to separate the trip piece from the reset connecting rod, and the movable contact of the input moving piece It is disconnected from the static contact of the copper sheet of the socket to achieve the purpose of leakage protection; the overcurrent protector is composed of an overcurrent detection coil and a normally open reed switch, and the normally open reed switch passes through the center hole of the overcurrent detection coil. The current detection coil is connected in series to the input live wire terminal of the main circuit, one end of the dry reed switch is connected to the input live wire terminal of the main circuit, and the other end is connected to the output neutral wire terminal after a resistor is connected in series; the tripping device includes The release device and the release plate inserted in the middle waist of the release device, the release A return spring is installed between the tripping piece and the tripping device. The tripping piece is parallel to the detection circuit board two. The front surface of the tripping piece is provided with an arc-shaped long hole for penetrating and fastening the reset connecting rod. The rear end is provided with a baffle plate for contact with the push rod, so that the push rod is pushed forward under the action of the magnetic field force and at the same time drives the trip piece to move forward in the middle waist of the release, and resets under the action of the return spring; At the bottom of the release, there is a bimetal sheet in contact with the switch sheet on the second surface of the detection circuit board. After the bimetal sheet contacts the switch sheet, it triggers the conduction of the silicon controlled rectifier to energize the electromagnetic coil to generate a magnetic field force. The two ends of the release There is a support block for supporting, the support block is connected with the movable contact, and a limit spring is provided under the support block to prevent the contact between the movable contact and the detection circuit board. Insert the center through hole of the reset connecting rod. The bottom of the reset connecting rod is provided with a snap ring for clamping the trip piece. In the process of rebounding and rising under the elastic force of the return spring, the moving contact is driven to rise to make the moving contact contact with the static contact.

When the load current is greater than the set value or the load terminal is short-circuited, the reed switch is closed, generating a leakage current greater than 6mA, the transformer detects the leakage current, the leakage detection IC outputs a high level, the thyristor is turned on, and the electromagnetic coil is energized The push rod moves forward to push the buckle piece to move forward and the connecting rod is separated from the trip piece, the contact of the moving piece is separated from the static contact, and the output is powered off. The disconnection current value can be accurate to more than 0.1A, and the disconnection time is less than 0.08S.

As a preference, the outer periphery of the overcurrent protector is provided with an insulating shell for accommodating the overcurrent detection coil and the reed switch. The magnetic field generated by the change of the current flowing through the energized coil is used to turn on the reed switch, so as to realize the safe disconnection of the circuit. Due to the simple structure, small size, fast closing speed and long working life of the reed switch used, it is different from the electronic Compared with the switch, it has the characteristics of strong load impact resistance and high reliability, which can improve the disconnection speed and response accuracy of the circuit due to short-circuit or over-current faults, and ensure the personal safety of the operator.

Preferably, the reed switch includes two parallel magnetizable reeds at the ends and a glass tube for encapsulating the reeds, the glass tube is filled with inert gas, and the two reed ends are provided with contacts, and the contacts are separated A gap is left to make the two reeds a normally open structure.

Preferably, the two sets of transformers include one set of live wire-neutral wire transformers for detecting live wire and neutral wire leakage current signals, and the other group is neutral wire-ground transformers for detecting neutral wire and ground wire leakage current signals. line transformer.

As a preference, an indicator light is provided on the surface of the socket panel, and the indicator light is installed on one surface of the detection circuit board. The indicator light is off when there is leakage or overcurrent tripping, and the indicator light is on when the socket is working normally.

The specific working principle of the utility model is as follows:

A) Reset process: Press the reset button, the reset spring is compressed, and the reset link is pressed down. During the process of pressing down the reset link, the reset link penetrates through the center hole of the release and reaches the surface of the release plate. At the same time, press down the release to make the bimetal at the bottom of the release contact with the switch piece on the surface of the detection circuit board, thereby conducting the electromagnetic coil and the thyristor, and the electromagnetic coil is energized to generate a magnetic field force to push the rod forward, and the Push it forward to contact with the baffle plate of the tripping piece, so that the tripping piece moves forward. At this time, the reset link will penetrate into the arc-shaped long hole on the surface of the tripping piece. After releasing the reset button, the reset link will reset and push The lever resets, and the trip piece resets under the action of the reset spring at the same time, so that the snap ring at the bottom of the reset connecting rod is fastened to the arc-shaped long hole, the reset connecting rod rises and resets under the rebound force of the reset spring, and The release moves up, and the supporting blocks at both ends of the release also drive the moving contacts to rise up, so that the moving contacts and the static contacts are tightly combined, and the socket copper plate is powered on and the indicator light is on.

B) Test process: Press the test button to make the test conduction metal sheet contact with the test switch, thereby generating a leakage current greater than 6mA, the electromagnetic coil is energized to generate a magnetic field force to push the rod forward, and the push rod is pushed forward and released The baffle plate of the buckle contacts to make the trip piece move forward. At this time, the trip piece is separated from the reset link. The static contact is open.

C) When there is leakage between the live wire and the neutral wire, the 1000:1 live wire-neutral wire transformer detects the leakage current signal, and after rectification and filtering, it is sent to the leakage detection IC for processing. When the leakage current is greater than 4mA-6mA, the leakage detection IC outputs High level, after the high level signal conducts the thyristor, the electromagnetic coil is energized, and the electromagnetic coil is energized to generate a magnetic field force to push the rod forward, and the push rod is pushed forward to contact the baffle plate of the tripping piece, so that The trip piece moves forward, and the snap ring is separated from the arc-shaped long hole, so that the reset link and the trip piece complete the tripping. Under the resilience of the input moving piece, the input moving piece drives the moving contact down, so that the moving contact Separated from the static contact, the copper sheet of the socket loses power, and the indicator light goes out, which protects personal and property safety.

D) When the neutral wire and the ground wire leak electricity, the 200:1 neutral wire-ground wire transformer detects the leakage current signal, and after rectification and filtering, it is sent to the leakage detection IC for processing. When the leakage current is greater than 4mA-6mA, the leakage detection IC outputs High level, after the high level signal conducts the thyristor, the electromagnetic coil is energized, and the electromagnetic coil is energized to generate a magnetic field force to push the rod forward, and the push rod is pushed forward to contact the baffle plate of the tripping piece, so that The trip piece moves forward, and the snap ring is separated from the arc-shaped long hole, so that the reset link and the trip piece complete the tripping. Under the resilience of the input moving piece, the input moving piece drives the moving contact down, so that the moving contact Separated from the static contact, the copper sheet of the socket loses power, and the indicator light goes out, which protects personal and property safety. Among them, the 4mA current is a current that does not endanger the safety of the human body, then the leakage detection IC outputs a low level, the thyristor is not conductive, the electromagnetic coil cannot be powered, and the push rod does not move, so the reset link and the buckle cannot be tripped.

E) In case of short circuit or overcurrent, when the load current exceeds the rated current, the magnetic field generated by the current coil of the overcurrent protector is enough to pull the normally open reed, and one end of the reed is connected to the terminal of the input fire line above 6mA , the other end of which is connected in series with a 15kΩ resistor and connected to the output zero line terminal. At this time, the leakage current will be generated. When the leakage detection IC detects the leakage current, it will output a high level. After the high level signal turns on the thyristor , the electromagnetic coil is energized, and the electromagnetic coil is energized to generate a magnetic field force to push the rod forward, and the push rod is pushed forward to contact the baffle plate of the trip piece, so that the trip piece moves forward, and the snap ring is separated from the arc-shaped long hole. Make the reset connecting rod and the trip piece complete the tripping, and under the rebound force of the input moving piece, the input moving piece drives the moving contact down, so that the moving contact is separated from the static contact, the copper piece of the socket loses power, and the indicator light goes out. To protect personal and property safety.

The leakage and overcurrent protection socket provided by the utility model mainly has the following advantages:

1. When a leakage occurs, the detection leakage current signal is accurate and sensitive, and the accuracy is greatly improved. The range values of the leakage current and the overcurrent value can be set separately according to the needs, which can be guaranteed to be within the safe range;

2. The tripping response time is fast, no more than 0.08S at most, which effectively protects personal and property safety;

3. It solves the problem that the leakage current prevention and protection current value of the total circuit are too large, which cannot protect the safety of each branch. It is easy to exceed the set leakage current value and protection current value, which affects the contradictions in normal use. Realized one-to-one protection.

4. There are multiple sockets on the same socket, which can meet the independent power consumption of multiple electrical appliances without mutual interference, and the circuit failure of a single line will not affect the normal use of other circuits;

5. One-to-one power consumption can effectively identify faulty circuits for easy maintenance, not only easy to use but also the fault location is clear at a glance.

Description of drawings

Fig. 1 is the overall structure schematic diagram of the utility model embodiment;

Fig. 2 is a schematic diagram of the overall structure of another angle of the embodiment of the utility model;

Fig. 3 is a schematic diagram of the internal structure of the utility model embodiment;

Fig. 4 is a schematic structural diagram of a tripping device according to an embodiment of the present invention;

In the figure, (1) socket panel, (2) power-on component, (3) reset button, (4) socket, (5) detection circuit board 2, (6) middle cover, (7) reset link, (8) Socket copper sheet, (9) fixed contact, (10) input live wire terminal, (11) output neutral wire terminal, (12) overcurrent protector, (13) electromagnetic coil, (14) transformer, (15) ) input moving piece, (16) moving contact, (17) overcurrent detection coil, (18) dry reed switch, (19) indicator light, (20) test button.

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment, the utility model is described in further detail.

In this embodiment, referring to FIGS. 1 to 4 , the leakage and overcurrent protection socket includes a socket panel 1 and an electrified component 2 fastened and fixed on the bottom of the socket panel 1 . The surface of the socket panel 1 is provided with a reset button 3 , a test button 20 and a The socket 4 above the group, the surface of the socket panel is provided with an indicator light 19, the indicator light 19 is installed on the surface of the detection circuit board, when there is leakage or overcurrent tripping, the indicator light goes out, and when the socket works normally, the indicator light turns on. Bright. The energization component 2 is composed of a protective shell with accommodating space and a detection circuit board 1, a detection circuit board 2 5, a reset device and a tripping device contained in the protection shell, and a middle cover 6 is arranged above the detection circuit board. The cover 6 is located between the detection circuit board 2 5 and the socket panel 1, the detection circuit board 1 is located on the surface of the middle cover 6, and the detection circuit board 1 surface is provided with a test switch, a rectifier diode 1 and a drop-down resistor, and a test button 20 is provided at the bottom of the test button 20. The return spring and the test conduction metal sheet for conducting the test switch make the test return spring between the detection circuit board one and the test button 20, and the test conduction metal sheet contacts the test switch after the test button 20 is pressed , after releasing the test button 20, under the resilience of the test return spring, the test conduction metal sheet is separated from the test switch; a pair of socket copper sheets 8 corresponding to the socket 4 are fixed on the middle cover 6, and the socket copper sheets 8. A pair of fixed contacts 9 are riveted at the middle end, and the side of the protective shell is respectively provided with an input live wire terminal 10 and an output neutral wire terminal 11 that conduct with the socket copper sheet 8; the reset device includes a reset button 3, a reset spring and a reset button. The connecting rod 7 and the reset button 3 are installed on the top of the reset connecting rod 7, the reset spring penetrates the reset connecting rod 7, the reset connecting rod 7 passes through the middle cover 6 and extends down to the bottom of the middle cover 6, so that the reset spring is located on the reset button 3 and between the middle cover 6.

The detection circuit board 2 5 is electrically connected with a leakage detection IC, a rectifier diode 2, a resistor, a capacitor, a piezoresistor, an overcurrent protector 12, a silicon controlled rectifier, an electromagnetic coil 13 and two groups of transformers 14. The surface of the circuit board 25 is provided with a switch plate for triggering the conduction of the thyristor to make the electromagnetic coil 13 work. The transformer 14 is used to detect the leakage current signal and send it to the leakage detection IC for analysis after rectification and filtering. The center of the transformer 14 A pair of input moving pieces 15 with resilience are pierced through the hole, and the input moving pieces 15 extend forward to both sides of the reset connecting rod 7, and a moving contact 16 corresponding to the fixed contact 9 is riveted at the end of the input moving piece 15, so that the moving The contact 16 is located directly below the static contact; the leakage detection IC is used to analyze and compare the magnitude of the leakage current signal value, and output a high level; the thyristor is used to conduct the electromagnetic coil 13 to make the electromagnetic coil 13 energized Generate a magnetic field; the center of the electromagnetic coil 13 is equipped with a push rod that is moved by a magnetic field force, and the push rod is parallel to the detection circuit board 25. When the electromagnetic coil 13 is energized, a magnetic field force is generated to push the push rod forward; the overcurrent protector 12 is activated by the overcurrent The detection coil 17 is composed of a normally open reed switch 18, the normally open reed switch 18 passes through the central hole of the overcurrent detection coil 17, and the overcurrent detection coil 17 is connected in series with the input fire wire terminal 10 of the main circuit, and the reed switch 18 One end of the main circuit is connected to the input live wire terminal 10 of the main circuit, and the other end is connected to the output neutral wire terminal 11 after a resistor is connected in series; the tripping device includes a tripper and a tripping piece inserted in the middle of the tripper , a return spring is installed between the tripping piece and the tripping device, the tripping piece is parallel to the detection circuit board 25, and the front surface of the tripping piece is provided with an arc-shaped long hole for penetrating and fastening the reset connecting rod 7 , the rear end of the release piece is provided with a baffle plate for contacting the push rod, so that the push rod is pushed forward under the action of the magnetic field and at the same time drives the release piece to move forward in the middle waist of the release, and the return spring Reset under the action of the tripper; at the bottom of the tripper, there is a bimetallic sheet in contact with the switch sheet on the surface of the detection circuit board 25. After the bimetallic sheet contacts the switch sheet, the electromagnetic coil 13 is turned on to generate a magnetic field force. Both ends are provided with support blocks for supporting, the support block is connected with the movable contact 16, and a limit spring is provided under the support block to prevent the contact between the movable contact 16 and the detection circuit board 25, and the top of the release The center is provided with a central through hole for penetrating the reset connecting rod 7, and the bottom of the reset connecting rod 7 is provided with a snap ring for clamping the trip piece, and the reset connecting rod 7 penetrates through the central through hole to make the snap ring fasten Shaped elongated hole, reset connecting rod 7 rebounds and rises under the elastic force effect of back-moving spring, drives movable contact 16 to rise and makes movable contact 16 contact with static contact.

The above content is a further detailed description of the utility model in conjunction with specific preferred embodiments, and it cannot be determined that the specific implementation of the utility model is only limited to these descriptions. For those of ordinary skill in the technical field to which the utility model belongs, on the premise of not departing from the concept of the utility model, some simple deduction or replacement can also be made, which should be regarded as the protection scope of the utility model.

Claims (5)

1. electric leakage over current is protected socket, comprise socket panel and be fastened at the energising assembly of socket panel bottom, socket panel surface is provided with reset key, test button and more than one group socket, this energising assembly is by the protecting sheathing with spatial accommodation and be contained in the testing circuit plate one of protecting sheathing inside, testing circuit plate two, resetting means and trip gear form, and be provided with middle cover above testing circuit plate, middle cover is between testing circuit plate two and socket panel, testing circuit plate one is arranged in cap surface, testing circuit plate one surface is provided with Test Switchboard, rectifier diode one and dropping resistor, test button bottom is provided with test return spring and for the test conduction sheet metal of this Test Switchboard of conducting, make to test return spring between testing circuit plate one and test button, after pressing test button, test conduction sheet metal contacts with Test Switchboard, after decontroling test button, testing under the resilience force effect of return spring, test conduction sheet metal is separated with Test Switchboard, in cover and be fixed with a pair of copper sheet of socket corresponding with socket, the riveted joint of copper sheet of socket middle-end has a pair of fixed contact, protecting sheathing side to be respectively equipped with input hot terminal and the output zero line terminals with copper sheet of socket conducting, this resetting means comprises reset key, back-moving spring and restoring link, reset key is arranged on the top of restoring link, back-moving spring penetrates restoring link, restoring link down extends to middle cover bottom through middle cover, make back-moving spring between reset key and middle cover, it is characterized in that: on this testing circuit plate two, be electrically connected with detection of electrical leakage IC, rectifier diode two, resistance, electric capacity, piezo-resistance, overcurrent protector, controllable silicon, solenoid and two groups of instrument transformers, and be provided with for triggering the switch plate of controlled silicon conducting on testing circuit plate two surfaces, make solenoid work, instrument transformer is delivered to detection of electrical leakage IC after for detection of leakage current signal rectifying and wave-filtering and is analyzed, the centre bore of instrument transformer is installed with a pair of input moving plate with resilience force, input moving plate extends to restoring link both sides forward, and there is the moving contact corresponding with fixed contact in the riveted joint of input moving plate end, make moving contact be positioned at fixed contact under, detection of electrical leakage IC, for analyzing and contrast the size criteria of leakage current signal value, is output as low level when leakage current signal value is less than set point 4.0mA, exports high level when leakage current signal value is 5mA-6mA, triggers controlled silicon conducting, controllable silicon is used for controlling solenoid power on/off, makes solenoid obtain electric rear generation magnetic field during controlled silicon conducting, solenoid center is provided with the catch bar of magnetic field force induced action, and catch bar is parallel to testing circuit plate two, when solenoid energising produces magnetic field force, catch bar is released forward, overcurrent protector consists of over-current detection coil and Chang Kai tongue tube, often open tongue tube through the centre bore of over-current detection coil, over-current detection coil tandem is in the input hot terminal of main circuit, one end of tongue tube is connected with the input hot terminal of main circuit, after its other end series resistor, is connected with output zero line terminals, described trip gear comprises release and is interspersed in the dropout sheet of position, the release middle part of the side, between dropout sheet and trip gear, return spring is installed, dropout sheet is parallel with testing circuit plate two, the front end surface of dropout sheet is provided with for penetrating the long arc-shaped holes with fastening restoring link, the rear end of dropout sheet is provided with the plate washer for contacting with catch bar, when catch bar is promoted under magnetic field force effect, drive dropout sheet to move in the middle part of the side of release forward forward, and reset under the effect of return spring, in release bottom, be provided with the bimetal leaf contacting with the switch plate on testing circuit plate two surfaces, after bimetal leaf contacts with switch plate, triggering controlled silicon conducting makes solenoid energising produce magnetic field force, the two ends of release are provided with for passive back-up block, back-up block is connected with moving contact, and below back-up block, be provided with the limit spring that prevents that moving contact from contacting with testing circuit plate two, the top center of release is provided with for penetrating the central bore of restoring link, this restoring link bottom is provided with for clamping the snap ring of dropout sheet, restoring link makes the snap ring long arc-shaped holes that links closely from central bore penetrates, in the restoring link process that resilience is risen under the elastic force effect of back-moving spring, after driving moving contact to rise, moving contact is contacted with fixed contact.

2. electric leakage over current protection socket according to claim 1, is characterized in that: described overcurrent protector is arranged with outward for holding the insulation crust of over-current detection coil and tongue tube.

3. electric leakage over current according to claim 2 is protected socket; it is characterized in that: described tongue tube comprises magnetizable reed that two end points places are parallel and for encapsulating the glass tube of reed; in glass tube, be filled with inert gas; two reed end points are provided with contact, and contact is separated and to be left gap to make two reeds be normal opening structure.

4. according to the electric leakage over current protection socket described in claim 1～3 any one; it is characterized in that: two groups of instrument transformers comprise that one group for the live wire-zero line mutual inductor for detection of live wire and zero line leakage current signal, and another group is the zero line-ground wire instrument transformer for detection of zero line and ground wire leakage current signal.

5. according to the electric leakage over current protection socket described in claim 1～3 any one, it is characterized in that: described socket panel surface is provided with indicator light, this indicator light is arranged on testing circuit plate one surface, and when there is electric leakage or overcurrent tripping, indicator light extinguishes.

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