Functions: 1.Over-voltage protection 2.Under-voltage protection 3.Over-current protection 4.Automatic recovery 5.Voltage display(voltage measurement). Current display (current measurement).Installation:35mm DIN rail Technical data: 1.Rated supply voltage:AC 220V 2.Operation volatge:AC 80-400V(single phase) 3.Rated frequency:50/60HZ 4.Electric current ( A) setting range:1-40A 5.Overvoltage ( U)setting range:230-300V 6.Undervoltage ( Less than U) setting range:210-140V 7.Rated current:40A 8. U and Less than U trip delay time:0.1-30s 9.Reset /start delay time:1-500s 10.Voltage measurement accuracy:2%(not exceeding 2% of the overall range) 11.Rated insulation voltage:400V 12.Max.Loading power: 1-40A Adjustable(default:40A) 13.Over-voltage protection value range:230V~300~OFF(default:270V) 14.Over-voltage recovery voltage range:225V--295V(default:265V) 15.Over-voltage protection action time:0.1s-30s(default value:1s) 16.Over-voltage recovery delay time:1s-500s(default:30s) 17.Under-voltage protection value range:210V--140V(default:170V) 18.Under-voltage recovery voltage range:215V--145V(default:175V) 19.Under-voltage protection action time:0.1s-30s(default:1s) 20.Under-voltage recovery delay time:1s-500s(default:30s) 21.Over-current recovery delay time:1-500s(default:30s) Material: PC colour: white Package Contents: 2 x Voltage Protector Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.