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Bard part 8407-027 is an OEM control transformer used to supply safe, stable 24 volt power for low voltage circuits in compatible Bard wall mounted HVAC equipment. Rated at 48 VA with a 480 volt primary and 24 volt secondary, this transformer is commonly used to power controls such as contactors, relays, and circuit boards, helping restore proper system operation when a transformer is open, overheating, or delivering low output. Verify your unit voltage and the part number from the Bard wiring diagram or service literature before ordering, since primary voltage and VA rating must match for correct fit and reliable performance.