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ATC Diversified Electronics SLD-120-ASA is part of the SLD series family of voltage monitors. The SLD Series is designed to protect 3 phase equipment against phase unbalance, phase loss, under voltage, and phase reversal conditions. With normal operating voltage present on all three phases in the proper phase sequence, the internal relay will energize. When an incorrect phase sequence or phase loss occurs or the three phase line voltages fall outside the preset unbalance or under voltage settings, the internal relay will de-energize. When all conditions return to normal, the relay will reset.