The automatic over-voltage and under-voltage protector is designed for three-phase AC 380V, 50/60Hz circuits with a rated working current of 63A or less. It provides instantaneous power cutoff when over-voltage or under-voltage conditions occur, protecting connected electrical equipment from damage. The protector automatically restores power when circuit voltage returns to normal levels. Color: Gray White Material: PC Plastic Functions: 1. Over-voltage protection 2. Under-voltage protection 3. Automatic power restoration 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. Maximum loading current: 63A 4. Over-voltage protection range: 230V–300V (adjustable), default 270V Over-voltage trip range: 225V–295V, default 265V Over-voltage protection response time: 0.1–30 seconds (default 1 second) 5. Under-voltage protection range: 140V–210V (adjustable), default 170V Under-voltage trip range: 145V–215V, default 175V Under-voltage protection response time: 0.1–30 seconds (default 1 second) 6. Three-phase voltage unbalance protection setting: 5–95V (adjustable), or OFF 7. Power-on delay time: 1–500 seconds (default 10 seconds) 8. Power restoration delay time: 1–500 seconds (default 30 seconds) 9. Installation: 35mm DIN rail Package Contents: 1 x 3-Phase Voltage Relay Note: The package includes only the items listed above. Light and display differences may cause slight color variations between the product image and the actual item. Measurement errors of ±1–3cm may occur.