HD LCD Display 40A 63A 80A 220V Digital Adjustable Low High Voltage Protection Circuit Breaker with Home Surge 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 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 30 seconds, when the power returns to normal. We have the manual in English,Ruian and Portuguese,tell us your e-mail addre then we will send it to you. Functions:1.Over-voltage protection2.Under-voltage protection3.Automatic recovery4.Volt-meterProduct Parameters:1.Model number:SVP-915-63A2.Power supply:230VAC 50/60Hz 3.Max.Loading power:40A,63A,80A4.Overvoltage protection value range:221V~290~OFF(default:275V) Over-voltage recovery voltage range:216V--285V(default:245V)Over-voltage protection action time:0.1s~3.0s(default value:0.2s)5.Undervoltage protection value range:219V--150V --OFF(default:170V) Under-voltage recovery voltage range:155V--224V (default:185V) Under-voltage protection action time:0.1s~30s(default:0.2s) 6.Power consumption : <2W 7.Electric machinery life : 100,000 times 8.Dimensions : 65*35*85mm 9.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.