Westinghouse 112D631H04 AC Control Transformer

The Westinghouse 112D631H04 AC Control Transformer is a 0.150 kVA (150 VA) single‑phase machine tool/control transformer that steps 240/480V AC down to 120V AC to supply isolated control power for industrial automation. It provides reliable low‑voltage power for relays, contactors, timers, pilot lights, PLCs, and other machine control devices in motor control centers, industrial control panels, and automation equipment, with 50/60 Hz operation and panel‑mounted installation. As part of the MTC Series, it is designed to isolate control circuits from higher‑voltage power, enhancing safety and reliability in industrial facilities, conveyors, packaging lines, HVAC systems, and other automation applications. Verified use cases include motor control, PLC systems, and general industrial control panels requiring stable 120V control power. Common replacements include Eaton MTC Series, Siemens Industrial Control Transformer, and Schneider Electric Square D equivalents; this model is a discontinued Westinghouse part that remains commonly available as surplus or replacement stock.