Voltage Sensing Relays and Monitors: Type - Voltage Monitor; Operation - Solid State; Phase - 3-Phase; Detection - Phase Failure/Reversal, Voltage Unbalance, Undervoltage; Protection - Transient Surge; Line Voltage - 480V AC; Voltage Range - 380-480V; Frequency - 60 Hz; Contact Configuration - SPDT; Contact Rating - 10A @ 240V; Mounting - 8 Pin Plug-in; Reset - Automatic; Enclosure - Dust Cover, ABS Plastic, Yellow; Manufacturer Series - 258