Lightning protection device for power supply

The utility model provides a detection, warning circuit are connected with back level lightning protection circuit between zero line and the live wire that lightning protection device for power supply is equipped with zero line lightning protection circuit, live wire lightning protection circuit and links to each other with it in the casing back level lightning protection circuit includes the fuse of one end connection on the live wire, and two parallelly connected piezo -resistor VR5, VR6 are connected to the fuse other end to the zero line is connected to the piezo -resistor VR5, the VR6 other end that ally oneself with. The protection method of the parallelly connected ground connection of the piezo -resistor that compares, there is corresponding fuse protection on each grade lightning protection circuit, after certain one -level protection was lost efficacy, fusing of metal, can not be influential to the power route, make system's normal operating, especially, be connected with back level lightning protec