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The Bard 8407-063 is an OEM control transformer used in Bard wall mounted HVAC equipment to step down a 400VAC supply to 24VAC control power with a 50 VA rating, helping deliver stable low voltage for relays, contactors, and control boards. When a transformer is weak, open, or overheating, it can cause intermittent control issues, nuisance shutdowns, or a completely dead low voltage circuit, so replacing it with the correct Bard part helps restore dependable operation and proper control voltage under load. Verify your unit voltage and wiring connections match the 400VAC primary and 24VAC secondary before ordering to ensure correct fit and safe installation.
* Orders less than $50 may incure a minimum order fee.