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Bard part number 8407-056 is an OEM step down transformer used in select Bard HVAC equipment to convert incoming 460V or 575V power to 230V where the unit requires a 230V feed for specific circuits or components. If your Bard wall mount or packaged unit is wired for 460/575V and needs a correct 230V supply point, this transformer helps restore proper voltage for safe, stable operation and prevents nuisance electrical issues caused by incorrect line voltage. Confirm primary tap and secondary wiring match your unit schematic before installation, and always verify compatibility by model and serial number to ensure the correct Bard replacement part is being used.