Description:  Automatic over-voltage and under-voltage protector is suitable for three-phase AC 380V, 50/60Hz, rated working current 50A or less loads.   Its main feature is when the circuit has over-voltage or under-voltage, over-current problems, the product can cut off the power supply instantaneously to protect the electrical equipment from being damaged, besides,the protector can automatically turn on the power supply when the circuit voltage returns to the normal.    Functions:  1.Over-voltage protection;  2.Under-voltage protection;  3.Over-current protection;  4.Automatic recovery;  5.Voltage display(voltage measurement);  6.Current display (current measurement);  7.Three-phase ampere unbalance protection;  8.Reverse phase protection;  9.Zero line break protection;  10.Phase failure protection;  11.Fault inquiry;  It will rotation display voltage and current for each phase.    Product Parameters:   2.Power supply: 3*230V / 400V AC 50/60Hz;  3.Max. Loading power:  1~50A  Adjustable（default:50A）;  1~63A Adjustable（default:63A）;  1~80A  Adjustable（default:80A）;  4.Over-voltage protection value range: 221V~300  Adjustable (default:280V);  Over-voltage recovery value range: 220V~299V (default 250V);  Over-voltage protection action time: 0.1~10 second （default 0.2s）;  5.Under-voltage protection value range: 150V~219V Adjustable (default:160V);  Under-voltage recovery value range: 151V~220V (default 180V);  Under-voltage protection action time: 0.1~10 second （default 0.2s）;  6.3 phases volt unbalance protection value: 10%~50%~0FF （default 20%）;  7.3 phases volt unbalance protection action time: 0.1~10 second（default:1s）;  8.Delay time after power-on: 2~255 second (default:2s);  9.Recovery delay time : 2~600s(default:60s);  10.Display model: LCD;  11.Dimensions : 70*65*95mm;  12.Installation: 35mm DIN rail;    Package included:  1 x 50/63/80A Automatic Recovery Voltage Relay