This accessory belongs to the Vigilohm range designed to monitor ungrounded/IT electrical networks at feeder level, in accordance to installation and products standards. This accessory is a voltage adaptor connected between the monitored network, and the insulation monitoring device. It allow to monitor insulation level of networks with a higher voltage level than what the devices can natively stand. This product can be used in industrial environement. For use with a IM400 insulation monitoring device on a 830V AC to 1700V AC network, between phases if neutral is accessible. Or on a 480V AC to 1000V AC network, between phases if neutral is not accessible. Compaitble with 480V DC to 1000V DC networks as well. The dimensions of this voltage adaptor are 90mm in height, 71mm in width, 67.5mm in depth for a product weight of 200 grams.