ATC Diversified CMU Series – AC Under Current Relay

The CMU series from the ATC Diversified Electronics division of Marsh Bellofram is an AC under current monitoring relay with adjustable time delay, designed to prevent damage and premature equipment failure in pumps, motors and other critical machinery and equipment. The internal relay is energized (pick-up) when monitored AC current is above the preset trip point. The relay de-energizes (drop-out) when the current falls below the trip point for longer than the adjustable delay. The delay is incorporated to prevent nuisance tripping caused by momentary line dips. The relay, which includes an automatic reset feature, re-energizes when the current rises 5% above the drop-out trip point for longer than 0.1 seconds.  An external CT may be used to extend the range of the current monitor.

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