The automatic over-voltage and under-voltage protector is suitable for three-phase AC 380V, 50 or 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 damaged, 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 or 400V AC 50 or 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.