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Voltage Monitor Relays provide protection to equipment where an over or under voltage condition is potentially damaging. They monitor either AC single phase (50−400Hz) or DC voltages. No supply (input) voltage is required.
The pick−up voltage setting is user−adjustable from 85−115% of the nominal voltage rating. As standard, the drop−out voltage setting is fixed at 3% below the pick−up voltage setting. The relay is energized when the monitored voltage is above the pick−up setting. The relay de−energizes when the monitored voltage is below the drop−out setting.