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The Bard 8401-027BX is an OEM 24V coil, 3 pole, 30 amp contactor used in Bard wall-mounted air conditioners and heat pump units to reliably switch high-voltage power to loads like the compressor, condenser fan, and electric heat circuits when the control board calls for operation. If you are troubleshooting a unit that will not start, is chattering, or has burned or pitted contacts, replacing the contactor is a common corrective step, and using the correct Bard part number helps ensure proper coil voltage, contact configuration, and electrical fit within the factory control panel.
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.