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ATC Diversified Electronics VBA-110-DLA is part of the VBA series family of voltage monitors. The VBA series features single phase monitoring relays designed to monitor supply voltage for a preselected under and over voltage limit. With normal operating voltage applied, the internal relay will energize (or pick up). When the voltage falls outside the preset over/under trip points for longer than release delay, the relay will de-energize (or drop out). The hysteresis feature in each unit on the under/over limits provides a differential between the pick up and drop out trip points.