The automatic over-voltage and under-voltage protector is suitable for three-phase AC 380V, 50/60Hz, rated working current 63A or less loads. main feature is when the circuit has over-voltage or under-voltage problems, the product can cut off the supply instantaneously to the electrical equipment from being , besides,the protector can automatically turn on the supply when the circuit voltage returns to the normal. Color: gray white Material: PC plastic Functions: 1.Over-voltage protection 2.Under-voltage protection 3.Automatic recovery 4.Voltage display(voltage measurement) 5.Three-phase ampere unbalance protection 6.Phase sequence protection (reverse phase protection) 7. line break protection 8.Phase failure protection Product Parameters: 1. number : TOVPD3 2. supply:3 x 230V / 400V AC 50/60Hz 3.Max.Loading :63A 4.Over-voltage protection value range:230V~300 Adjustable (default:270V) Over-voltage recovery value range:225V~295V (default 265V) Over-voltage protection action time:0.1~30 second (default 1) 5.Under-voltage protection value range:140V~210V Adjustable (default:170V) Under-voltage recovery value range:145V~215V (default 175V) Under-voltage protection action time:0.1~30 second (default 1S) 6.3 phases volt unbalance protection value:5-95V adjustabe OFF 7.Delay time after -on:1~500 second (default:10s) 8.Recovery delay time : 1~500s(default:30s) 9.Installation:35mm DIN rail Package Contents: 1 x 3 Phase Voltage Relay Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.