GE Consumer & Industrial is offering Single -Phase voltage operated Induction-Disk Time Delay Relay , type IFV. These relays are specially designed and developed to respond, with time delay, to an increasing voltage. These are available in various models, of which some models are frequency compensated and some incorporates an instantaneous unit. These Single -Phase voltage operated Induction-Disk Time Delay Relays are mainly used in AC generators and Ungrounded three-phase distribution system.