The IR425-D4-1 insulation monitoring device (Isometer) operates with a nominal system voltage range of 0-300 VAC/DC (15-460 Hz), featuring a power supply range of 9.6-94 VDC or 16-72 VAC (15-460 Hz). It supports insulation resistance measurement from 1-200 kΩ and comes with screw-type terminals for secure connections.