Insulation monitor, product range: EMR measuring and monitoring relay, status display via LED, open-circuit principle, test or reset with button on the device or via control input, error memory/memory function configurable, zero-voltage-proof error memory configurable, monitoring of: insulation resistance in unearthed alternating current networks (2-, 3-, 4-phase system), adjustable response value: 1 - 100 k¿, supply voltage: 24 - 240 V AC, 50/60 Hz, 24 - 240 V DC, nominal voltage of the network to be monitored: 0 - 400 V AC, installation position: any, fastening: snap-on fastening DIN rail IEC/EN 60715, width: 22.5 mm, standards and regulations: IEC/EN 60255-6, EN 61557, UL, CSA, GL