1Standard modular construction, rail mounted. 2LCD display shows voltage value, fault status, parameter setting. 3Real-time monitoring of three-phase overvoltage, undervoltage, phase error, phase loss, voltage imbalance faulty. 4Powered by the measuring circuit, no additional auxiliary power required. 5Adjustable overvoltage value, undervoltage value, voltage imbalance rate and action time.Features:Standard modular construction, rail mounted. LCD display shows voltage value, fault status, parameter setting. Real-time monitoring of three-phase overvoltage, undervoltage, phase error, phase loss, voltage imbalance faulty. Powered by the measuring circuit, no additional auxiliary power required. Adjustable overvoltage value, undervoltage value, voltage imbalance rate and action time. Fault record function.Specification: Rated Voltage: 300-500VAC, 50Hz Protection Function: Overvoltage, Undervoltage, Phase Failure, Phase Error, Voltage Imbalance, Fault Record Parameter Setting: Overvoltage: 390-490V Undervoltage: 300-370V Overvoltage Delay: 0.1-25s Undervoltage Delay: 0.1-25s Unbalance Rate: 5-29% Unbalance Delay: 1-25s Phase Sequence: ON/OFF Reset: AU/HA Contact Form: A group of NO, a group of NC Contact Capacity: 6A AC250V (resistive) Mount Method: 35mm DIN rail