Protective circuit for electric leakage detection

The present invention provides a leakage detection and protection circuit, comprising power input, power output, normally open main circuit switch, a reset button reset successfully driven to lift the main circuit switch is closed, and with the mechanical structure of the main circuit switch is turned off the trip coil, controlling a trip coil power supply circuit of the thyristor off, the leakage current through the induction coil and the detection result of the driving-off thyristor control chip, further comprising a reset button is pressed following the operation of the analog momentary closure of the drain generating a switching current, leakage current analog switch is a trip coil power supply and the two input terminals of the induction coil formed through the test loop, two power input terminal is provided with a pair of discharge sheet and metal sheet serves as the heat sink. Advantageous effects of the invention: while with leakage protection, end of life detection and anti-wiring protection, safe; metal sheet is provided with a pair of sheet discharge and also serves as a heat sink to effectively reduce the temperature rise and prevent lightning damage, and long service life.