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The Bard 8407-064 transformer is a genuine OEM step-down control transformer used in Bard wall-mounted HVAC equipment to convert 575 VAC line power to a stable 24 VAC supply for low-voltage controls such as contactor coils, relays, and control circuits. Rated at 100 VA, it is sized to handle typical control loads while helping prevent nuisance control dropouts that can occur with weak or overheated transformers. Use Bard part 8407-064 when you need an exact-fit replacement to restore proper low-voltage power delivery and reliable unit operation, and confirm primary voltage and wiring match your unit’s schematic before installation.