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230V AC Single Phase Adjustable Over and Under Voltage Protector with Over Current Protection Din rail mounting dual LED display Product Description Functions:1.Over-voltage protection 2.Under-voltage protection 3.Over-current protection 4.Automatic recovery 5.Voltage display(voltage measurement) 6.Current display (current measurement) 7. Voltage calibration: Voltage +-10% adjustable. A13 8. Restore factory settings: press the down button for more than 12s 9. Fault inquiry: