1-phase AC/DC over or undervoltage monitoring relay, nominal range 2-500 V AC/DC, SPDT relay output, 36 mm plug-in housing Specifications Supply Voltage 115/230 V AC Mounting Plug-in 1-phase ac/dc voltage function Overvoltage; Undervoltage; Over or undervoltage Monitored voltage Monitoring external voltage 1-phase voltage range 24-240 Vac/dc; 208-480 Vac; 2-500 Vac/dc Output 1 relay Time delay Delay on alarm