The Resideo AT140B1214 Transformer is a dependable multi-voltage control transformer designed to supply a stable 24V output for HVAC systems. Operating from 120V, 208V, or 240V inputs, it provides consistent power for thermostats, zone valves, relays, and furnace or boiler controls. https://www.partshnc.com/at140b1214-resideo-120208240-24v-transformer