Insulation monitoring relays, Product range: EMR Measuring and monitoring relays, Status indication via LEDs, Open-circuit principle, Test or reset with button on device or with control input, Configurable fault memory/memory function, Configurable non-volatile fault memory, Monitoring of: Insulation resistance in non-earthed AC supply systems (two-phase, three-phase, four-phase systems), Insulation resistance in non-earthed DC supply systems (two-phase, three-phase systems), adjustable sensitivity range: 1 - 100 kΩ, Supply voltage: 24 - 240 V AC, 50/60 Hz, 24 - 240 V DC , Rated operating voltage for the supply system being monitored: 0 - 250 V AC, 0 - 300 V DC, Mounting position: As required, Fixing: Snap fixing, top-hat rail IEC/EN 60715, Width: 22.5 mm, Standards: IEC/EN 60255-6,