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ATC Diversified Electronics CDU-120-ALE-20 current monitor is part of the CDU series family.  It is designed to detect under current conditions.  The internal relay for the CDU series is energized (or pick up) when the monitored current is above the preset trip point. The relay will de-energize (or drop out) when the current falls below the trip point for longer than the adjustable delay.  The delay is important to prevent tripping caused by momentary line dips.