The Functional Devices TR300VA002 480/240/208/120-24V 300Va Xfrm is a versatile transformer that can efficiently convert electrical power for a variety of HVAC equipment. Reducing higher voltage inputs (480V, 240V, 208V, or 120V) to a lower, simpler-to-handle 24V output is how this device operates. https://www.partshnc.com/tr300va002-functional-devices-480240208120-24v-300va-xfrm