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The Bard 8201-123BX solid state relay (boxed) is an OEM electrical control component used to switch loads in Bard wall mount HVAC equipment using solid state electronics for consistent, reliable operation. When a relay begins to fail, symptoms can include intermittent component operation, no-start conditions, or erratic heating and cooling calls, so replacing it with the correct Bard relay helps restore proper control response and protects the rest of the circuit. Because solid state relays are application specific by rating and wiring, confirm compatibility by matching the full part number 8201-123BX to your unit model and the service literature before ordering.
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.