The Resideo AT150A1007 Transformer delivers reliable low-voltage power for HVAC control systems by converting 120V, 208V, or 240V input to a stable 27V output at 50VA. It supports thermostats, relays, zone valves, and furnace or boiler controls, ensuring consistent system performance. https://www.partshnc.com/at150a1007-resideo-50va-transfmr-120208240-27v