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The Bard 8407-069BX is an OEM control transformer used in Bard wall mount HVAC equipment to step down incoming high voltage (400/480V primary) to 24VAC for the unit’s low-voltage control circuit. Rated at 50VA and commonly supplied with an integral 3 amp breaker, this transformer helps power critical components like contactors, relays, and safety controls while providing dependable control voltage under normal operating loads. Use this part when you have confirmed a failed transformer, nuisance low-voltage dropouts, or damage from a control-side short, and verify primary voltage and mounting compatibility against your Bard unit wiring diagram before ordering.
Bard uses suffixes like "BX" to manage parts internally. These do not change the physical form or function of the part.
A part number ending in "BX" simply means it is packaged in a box for shipping, rather than for internal assembly use.
Example: 8406-142BX is physically identical to 8406-142.