The automatic over-voltage and under-voltage protector is suitable for three-phase AC 380V, 50/60Hz, rated working current 63A or less loads. Its main feature is when the circuit has over-voltage or under-voltage problems, the product can cut off the power supply instantaneously to protect the electrical equipment from being damaged. 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 recovery 4. Voltage display (voltage measurement) 5. Three-phase ampere unbalance protection 6. Phase sequence protection (reverse phase protection) 7. Zero line 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 recovery value range: 225V~295V (default: 265V) Over-voltage protection action time: 0.1~30 seconds (default: 1 second) 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 seconds (default: 1 second) 6. Three-phase voltage unbalance protection value: 5-95V adjustable, OFF option available 7. Delay time after power-on: 1~500 seconds (default: 10 seconds) 8. Recovery delay time: 1~500 seconds (default: 30 seconds) 9. Installation: 35mm DIN rail Package Contents: 1 x 3 Phase Voltage Relay Note: Light and different displays may cause the color of the item in the picture to be slightly different from the real thing. Measurement allowed error is +/- 1-3cm.