The 1618113-7 is a WOUVT series combination over/undervoltage protective relay designed to provide band-pass voltage protection for single or three-phase AC applications. It operates over a line frequency of 50-400 Hz and features screwdriver-adjustable trip points for undervoltage (70-100% of nominal) and overvoltage (100-125% of nominal). An adjustable time delay from 0.5 to 20 seconds prevents nuisance tripping from momentary voltage transients. This relay, which includes one set of normally open and one set of normally closed contacts, is suitable for protecting sensitive equipment by ensuring operation within a specified voltage range.