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The Bard 8551-004BX motor starting device is an OEM start component used in Bard wall mounted HVAC equipment to help the motor start reliably under load and reduce hard starting issues that can show up as slow starts, humming, or nuisance trips. This boxed Bard replacement is typically used as a factory specified motor start device on applicable units and is also listed as the direct replacement for Bard 8551-004, making it a solid choice when you need the correct OEM part for proper fit, wiring compatibility, and dependable system operation. Confirm the part number from your unit wiring diagram or service literature before ordering to ensure correct application.
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.