Din Rail Adjustable 63A 230V Over Under Voltage Protective Device Protector Relay with Over Current for Protection The automatic recovery over voltage and under voltage protective device complies with modular design standards. the circuit boards of products adopt good quality electronic components with reliable performance. when the power situation is unstable. It's for protection function will be automatically activated. once the voltage exceeds the limited range of products, it will automatically cut off so as to protect the safely of electrical equipment and persons. Parameter Over voltage protecition: Range( 230V-300VAC) , Defatult(270VAC) Under voltage protection: Range( 145V-210VAC), Defatult(170VAC) Over current protection: Range (1A-63A), Defatult(40A) Recovery Delay Time: Range(3s-300s), Defatult(30s) Pacage included 1 * Over Under Voltage Protector