The Trane TRR00664 Transformer is a 350 VA HVAC transformer designed to convert 460–575V primary power to 115–230V secondary power for reliable electrical operation. It uses electromagnetic induction between internal windings to provide the required voltage for HVAC control circuits and components. This transformer is commonly used in Trane commercial rooftop units, packaged units, fu... https://www.partshnc.com/trane-trr00664-transformer-460-575v-pri-115-230v-sec-350-va