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The Bard 8407-068BX is an OEM control transformer used in Bard wall mounted HVAC equipment to step down 208/240 VAC line power to 24 VAC for the low voltage control circuit. This 50 VA transformer supports stable operation of key components such as contactors, relays, and control boards, helping prevent nuisance shutdowns caused by weak or fluctuating control voltage. Bard lists this part as the boxed service replacement and it supersedes earlier transformer part numbers used on some units, so it is a solid choice when you need the correct OEM fit and output for a 208/240-to-24V control system.
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.