1.Over-voltage protection 2.Under-voltage protection 3.Voltage display (separate ABC phase volt measurement) 4.Three-phase Volt unbalance protection 5.Phase Sequence protection (reverse phase protection) 6.Zero line break protection 7.Phase Failure protection 8.Over-voltage protection value adjustable 9.Over-voltage recovery value adjustable 10.Over-voltage protection action time adjustable 11.Under-voltage protection value adjustable 12.Under-voltage recovery value adjustable 13.Under-voltage protection action time adjustable 14. 3 phases Volt unbalance protection value adjustable 15. 3 phases Volt unbalance protection action time adjustable 16.Delay time after power-on adjustable 17.Fault recovery delay time adjustable 18.Reset mode selection 19.Fault inquiry 20.Factory data Reset Product Parameters: 1.Model number : STVP-932 2.Power supply:3*230V / 400V AC 50/60Hz 3.Max.Loading power: 50A or 63A or 80A 4.Over-voltage protection value range:221V~300-OFF 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-OFF Adjustable (default:160V) model: 80A Colour:white Material:ABS+electronic components Size:72 x 65 x 80mm Package Contents: 1 * Overvoltage protector 1 * English manual Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.