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The Bard 8401-038BX is an OEM 2-pole, 40 amp contactor with a 24V coil used in many Bard wall-mounted air conditioners and related HVAC packages to reliably switch high-voltage power to major loads like the compressor and condenser fan when called by the control circuit. This contactor style includes an auxiliary contact for additional control or monitoring functions, which is commonly used for sequenced operation and safety interlocks depending on the unit configuration. If you are diagnosing a no-cool or intermittent operation issue tied to chattering, pitted contacts, or a weak pull-in, replacing with the correct Bard 8401-038BX helps restore proper electrical switching and dependable equipment operation when matched to your model and wiring diagram.
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.