1. The automatic over - voltage and under - voltage protector is suitable for three - phase AC 380V, 50/60Hz loads with a rated operating current of 63A and below. Its main feature is that when an over - voltage or under - voltage problem occurs in the circuit, the product can instantly cut off the power supply to protect electrical equipment from damage. In addition, when the circuit voltage returns to normal, the protector can automatically turn on the power supply. 2. Color: Off - white 3. Material: PC plastic 4. Functions: 1. Over - voltage protection 2. Under - voltage protection 3. Automatic recovery 4. Voltage display (voltage measurement) 5. Three - phase current imbalance protection 6. Phase sequence protection (reverse phase protection) 7. Neutral line open - circuit protection 8. Phase loss protection 5. Product parameters: 1. Model: TOVPD3 2. Power supply: 3 x 230V / 400V AC 50/60Hz 3. Maximum load power: 63A 4. Over - voltage protection value range: Adjustable from 230V to 300V (default value: 270V). Over - voltage recovery value range: 225V - 295V (default value: 265V). Over - voltage protection action time: 0.1 - 30 seconds (default value: 1 second). 5. Under - voltage protection value range: Adjustable from 140V to 210V (default value: 170V). Under - voltage recovery value range: 145V - 215V (default value: 175V). Under - voltage protection action time: 0.1 - 30 seconds (default value: 1 second). 6. Three - phase voltage imbalance protection value: Adjustable from 5 to 95V (off). 7. Delay time after power - on: 1 - 500 seconds (default value: 10 seconds). 8. Recovery delay time: 1 - 500 seconds (default value: 30 seconds). 9. Installation method: 35mm rail installation 6. Package contents: 1. One three - phase voltage relay Only the above - mentioned items are included in the package, and no other products are included. Note: Light and different monitors may cause slight differences between the color of the items in the picture and the actual product. The allowable measurement error is +/- 1 - 3cm.