Electric leakage protection switch with automatic detection and self-resetting functions and protection method

The invention relates to an electric leakage protection switch with automatic detection and self-resetting functions. The electric leakage protection switch comprises a control chip, a relay, a voltage reduction circuit, a power source circuit, an electric leakage detection circuit, a mains supply detection synchronous circuit and a driving circuit; the electric leakage detection circuit comprisesa mutual inductor coil HGQ1; two input lines of a mains supply penetrate through the mutual inductor coil HGQ1; one end of the mutual inductor coil HGQ1 is grounded, and the other end of the mutual inductor coil HGQ1 is connected with the pin of the control chip; the voltage reduction circuit comprises a first resistor module, a second resistor module and an electronic switch module; and the first resistor module and the second resistor module are connected in series. The protection switch has electric leakage protection and automatic resetting functions. In addition, the invention further discloses a corresponding e