3-phase 380V LCD Self-resetting Adjustable Surge Voltage Protector Features: 1. Overvoltage protection 2. Under voltage protection 3. Voltage display (voltage measurement ABC Separate Phase Voltage) 4. Three-phase voltage unbalance protection 5. Phase sequence protection (reverse phase protection) 6. Zero break protection 7. Phase failure protection 8. Overvoltage protection value is adjustable 9. Overvoltage recovery value is adjustable 10. Overvoltage protection action time is adjustable 11. Undervoltage protection value is adjustable 12. Undervoltage recovery value is adjustable 13. Undervoltage protection action time is adjustable 14. Three-phase voltage unbalance protection value is adjustable 15. Three-phase voltage unbalance protection action time is adjustable 16. The power-on delay time is adjustable 17. Fault recovery delay time is adjustable 18. Reset mode selection 19. Troubleshooting 20. Restore factory settings Parameter: 1. Rated voltage: three-phase four-wire 230V400VAC 5060Hz 2. Rated current: 50A, 63A, 80A 3. Overvoltage protection value range: 221V-300V-OFF (default value 280V) 4. Overvoltage recovery value range: 220V-299V (default value 250V) 5. Overvoltage protection action time is adjustable: 0.1 seconds-10 seconds (default value 0.2 seconds) 6. Undervoltage protection value range: 219V-150V-OFF (default value 160V) 7. Undervoltage recovery value range: 220V-151V (default value 180V) 8. Undervoltage protection action time is adjustable: 0.1 seconds-10 seconds (default value 0.2 seconds) 9. Three-phase voltage unbalance protection value range: 10%-50%-OFF 10. Phase voltage unbalance protection action time: 0.1 seconds-10 seconds (default value 1.0 seconds) 11. Power-on delay connection time: 2-255 seconds (default value 2 seconds) 12. Failure recovery delay time: 2-512 seconds (default value 60 seconds) 13. Display mode: LCD 14. Fault indication: segment code characters 15. Sampling method: pha