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Bard part 8407-050 is an OEM control transformer that steps 480 VAC line voltage down to 24 VAC at 75 VA to supply stable low-voltage power for HVAC control circuits such as contactor coils, relays, and thermostat inputs on compatible Bard equipment. If your unit has weak or intermittent control power, nuisance dropouts, or a burned transformer, replacing it with the correct Bard transformer helps restore proper operation and protects downstream components by delivering the intended 24-volt control power. Confirm primary voltage and VA requirements, then match the part number 8407-050 to your unit’s model and serial to ensure proper fit and wiring compatibility.