The Insulation Resistance Monitoring Relay is designed to monitor insulation resistance in unearthed AC, DC, or AC/DC systems. It can handle voltages up to 400V AC and 600V DC. The measuring range for insulation resistance is 1-200 kO, and it has a system leakage capacitance of 20 mF. The relay features 2 changeover contacts with SPDT configuration and a supply voltage range of 24-240V AC/DC. It comes in a compact form factor with a width of 22.5mm per module.