Ac voltage protection relays provide voltage monitoring and protection in both single and three phase systems. They are used in main failure, regulation of power supplies and to protect voltage sensitive equipment. The relay operates when the externally adjustable trip point is reached. They are available in different units like under, over and combined over/under units to use in different positions. Voltage monitor relays provide protection to equipment where an over or under voltage condition is potentially damaging. They monitor both ac and dc phase.

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