1.Over-voltage protection 2.Under-voltage protection 3.Over-current protection 4.Automatic recovery 5.Voltage display(voltage measurement) Current display (current measurement) Voltage calibration: Voltage +-10% adjustable. A13 Restore factory settings: the down button for more than 12s Fault inquiry: the UP button from more than 12S Power supply:230VAC 50/60Hz Max.Loading power:1-40A Adjustable(default:40A) 1-63A Adjustable(default:63A) Over-voltage protection value range:220V-300-OFF(default:270V) Over-voltage recovery voltage range:220V--295V(default:250V) Over-voltage protection action time:0.1s-30s(default value:0.5s) Over-voltage recovery delay time:1s-500s(default:30s) Under-voltage protection value range:140V--210V --OFF(default:170V) Under-voltage recovery voltage range:145V--215V (default:190V) Under-voltage protection action time:0.1s-30s(default:0.5s) Under-voltage recovery delay time:1s-500s(default:30s)Over-current adjustment range:1-40A (default:20A) 1-63A (default:40A) Over-current action range:0.1-30 second (default:0.5s) Over-currentrecovery delay time:1s-500s(default:30s) Power-on delay time:1s-500s(default:10s) Power consumption: Less than 2W Electric machinery life: 100,000 times Color: As Shown Material: plastic Package Contents: 1 x household switch 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.