The Trane CNT05176 3-Phase Line Monitor Control is an electrical protection device designed to monitor voltage conditions in compatible three-phase HVAC equipment operating within its 180–632VAC range. It detects electrical irregularities, such as voltage imbalance or phase loss, and helps protect connected equipment by signaling when unsafe conditions occur. This control is commonly ... https://www.partshnc.com/trane-cnt05176-3-phase-line-monitor-control-180-632vac