The tomatic 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 power supply instantaneously to the electrical equipment from being damaged, besides,the protector can tomatically turn on the power 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.tomatic 4.Voltage display(voltage measurement) 5.Three-phase unbalance protection 6.Phase sequence protection (reverse phase protection) 7. 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~300 Adjustable (deflt:270V) Over-voltage value range:225V~295V (deflt 265V) Over-voltage protection action time:0.1~30 second (deflt 1) 5.Under-voltage protection value range:140V~210V Adjustable (deflt:170V) Under-voltage value range:145V~215V (deflt 175V) Under-voltage protection action time:0.1~30 second (deflt 1S) 6.3 phases volt unbalance protection value:5-95V adjustabe OFF 7.Delay time after power-on:1~500 second (deflt:10s) 8. delay time : 1~500s(deflt:30s) 9.Installation:35mm DIN rail Package Contents: 1 x 3 Phase Voltage Relay Only the above package content, other are not included. Note: Light and different displays may cse the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.