Digital display self-recovery over-voltage protector is mainly used for photovoltaic grid-connected, household, and similar low-voltage distribution lines. It can automatically disconnect when there is over voltage, under voltage or voltage loss in the line, and automatic detection of wire voltage. It is a protector that can automatically be closed when the line of electricity back to normal. Features: The over-voltage and under-voltage protection threshold is adjustable, which is convenient for the user to set the voltage protection range in real-time according to the power consumption environment. It can cut off the line in time when the overvoltage occurs, and automatically connect the line after a delay when the line is restored to normal without manual operation. Display range of effective voltage 70-400V Withstand lightning surge voltage:5KV Technical Parameters Electrical parameters Rated working voltage : AC230V/50Hz Rated working current :40A and 63A Maximum short-circuit withstand current:3000A below 40A,4500A above 50A Overvoltage protection value:AC230V-AC275V,factory default 275V Ambient temperature Action time :0-30S Power off time :2S(set 0-180S) Recovery time: 2S(set 0-30s) Uses: Protecting home and industrial appliances. Voltage safety for motors and pumps. Electrical panel protection systems. Preventing damage from power fluctuations. Use in residential and commercial power lines. Package Include: 1 x Over and Under Voltage Relay Protective Device V-Protector Protector VP-40A