Functions: 1.Over- protection 2.Under- protection 3.Over-current protection 4.Automatic 5. display( measurement). Current display (current measurement).Installation:35mm DIN rail Technical data: 1.Rated supply :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 / delay time:1-500s 10. measurement accuracy:2%(not exceeding 2% of the overall range) 11.Rated insulation :400V 12.Max.Loading power: 1-40A Adjustable(default:40A) 13.Over- protection value range:230V~300~OFF(default:270V) 14.Over- range:225V--295V(default:265V) 15.Over- protection action time:0.1s-30s(default value:1s) 16.Over- delay time:1s-500s(default:30s) 17.Under- protection value range:210V--140V(default:170V) 18.Under- range:215V--145V(default:175V) 19.Under- protection action time:0.1s-30s(default:1s) 20.Under- delay time:1s-500s(default:30s) 21.Over-current delay time:1-500s(default:30s) Material: PC colour: white Package Contents: 1 x 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 a little different from the real thing. The measurement allowed error is +/- 1-3cm.