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 that when the circuit experiences over-voltage or under-voltage issues, the product can instantly cut off the power supply to protect electrical equipment from damage. Additionally, the protector automatically restores power 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. 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: 1 second) 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: 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. 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 to appear slightly different from the real thing. Measurement allowed error is +/- 1-3cm.