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ATC Diversified Electronics SLC-120-ALE is part of the SLC series family of voltage monitors. The SLC series is designed to protect 3-phase equipment against phase unbalance and phase loss conditions. With normal operating voltages applied to all three phases, the internal relay will remain de-energized. However, when a phase loss or phase unbalance exceeding the preselected trip point occurs, the relay will energize. The SLC series is typically used in conjunction with a shunt trip breaker.