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Bard 8407-065 is an OEM control transformer designed to step down 208/240-volt primary power to 24 volts for the low-voltage control circuit in Bard wall-mount HVAC equipment, supplying up to 75 VA to reliably power items like contactor coils, relays, and other 24V controls. This transformer assembly is commonly listed with an integral protective breaker, helping safeguard the control circuit during faults or overload conditions, and it is a direct-fit replacement that supports proper control voltage and stable operation when the original transformer is weak, overheated, or open. Confirm the part number on your unit’s wiring diagram or parts list and match primary voltage and VA rating before ordering to ensure correct fit and performance.