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The Bard 8605-017BX crankcase heater wraparound is an OEM compressor accessory designed to keep the compressor crankcase warm during off cycles, which helps reduce refrigerant migration into the oil and supports reliable starts after long shutdowns or cold ambient conditions. This wraparound style heater mounts around the compressor body and is commonly used on Bard wall-mount HVAC equipment where factory specifications call for crankcase heat to protect the compressor and maintain proper lubrication at startup. If you are replacing a failed heater or restoring a unit that trips on cold start, 8605-017BX is the correct Bard replacement part referenced as the updated part number for 8605-017, and it is intended to match Bard fit and electrical performance requirements when installed per the unit wiring diagram and service literature.
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.