The automatic over-voltage and under-voltage protector is suitable for three-phase AC 380V, 50/60Hz, rated working current 63A or less loads. When the circuit has over-voltage or under-voltage problems, the product can cut off the power supply instantaneously to prevent electrical equipment from being damaged, besides, the protector can automatically turn on the power supply when the circuit voltage returns to normal. Color: gray white Material: PC plastic Functions: 1. Over-voltage protection 2. Under-voltage protection 3. Automatic reset 4. Voltage display(voltage measurement) 5. Three-phase unbalance protection 6. Phase sequence protection (reverse phase protection) 7. Phase break protection 8. Phase failure protection Product Parameters: 1. Model number : TOVPD3 2. Power supply:3 x 230V / 400V AC 50/60Hz 3. Max. Loading power:63A 4. Over-voltage protection value range:230V~300V Adjustable (default:270V) Over-voltage value range:225V~295V (default 265V) Over-voltage protection action time:0.1~30 seconds (default 1s) 5. Under-voltage protection value range:140V~210V Adjustable (default:170V) Under-voltage value range:145V~215V (default 175V) Under-voltage protection action time:0.1~30 seconds (default 1S) 6. 3 phases volt unbalance protection value:5-95V adjustable OFF 7. Delay time after power-on:1~500 seconds (default:10s) 8. Recovery delay time : 1~500s(default:30s) 9. Installation:35mm DIN rail Package Contents: 1 x 3 Phase Voltage Relay