Description:  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 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. The device will re-supply in 1 minute, when the power returns to normal.    Functions:  1. Over-voltage protection;  2. Under-voltage protection;  3. Voltage meter;  4. Automatic recovery;    Product Parameters:  Power supply: 230Vac 50/60Hz;  Max.Loading power: 40A;  Over-voltage action cut-off value : 275Vac +/- 5V;  Normal-voltage value: 175~270Vac;  Under-voltage action cut-off value : 170Vac +/- 5V;  Over voltage and under voltage cut off : <1s;  Relay recovery time : 60s;  Power consumption : <2W;  Electric machinery life : 100,000 times;  Dimensions : 77*36*45mm;  Installation: 35mm DIN rail;     Noted: When you first connect the product, you have to wait about 1 minute, after the red light turn off, then the product will work.    Package included:  1 x Automatic Recovery Over Under Voltage Protector