Minilec ALV D2 Phase Failure Relay operates when there is phase failure unbalance phase sequence under voltages over voltages in the circuit Has auto reset and Fixed unbalance settings Adjustable UV OV Settings Equipped with 2 CO Output Contacts Suitable for monitoring 3 Ph System supply from MAINS amp used by motor load -AC amp R Chiller compressor motors AHU Fan Pump Motors Machinery using multiple small motors MAIN powers supply distribution panel board DG Set application UPS Submersible Pumps Hoist amp Crane Buy Minilec ALV D2 DIN Rail Mounted Voltage Sensing Phase Failure Relay with under amp over Voltage Variable online at https www electrikals com product minilec-alv-d2-din-rail-mounted-voltage-sensing-phase-failure-relay-with-under-over-voltage-variable- id 25597