The Type IAV relays are single phase induction disk relays designed to respond, with time delay, to either an increasing or a decreasing voltage, or both. Some models are frequency compensated, and some include an instantaneous unit (hinged armature type). Most models listed in the Selection Guide include a target seal-in unit on all contacts.

Applications 

• AC generators (including Hydro)
• Distribution feeder

Protection and Control 

• Generator overvoltage
• Feeder under and overvoltage

Available IAV models:

• IAV51, IAV52, IAV53, IAV54 & IAV55
• IAV69
• IAV70, IAV71 & IAV74

Manufacturing for the following models have been discontinued:

• IAV57
• IAV63
• IAV72
• IAV73
• IAV99