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Bard part 8401-006 is an OEM 2-pole, 20-amp contactor used in Bard wall-mounted HVAC equipment to switch line power to high-load components like the compressor and condenser fan using a low-voltage control signal. When a contactor is worn or pitted, it can cause intermittent starts, chattering, or no cooling, so replacing it with the correct Bard-rated part helps restore dependable operation and proper electrical control. This part number is commonly shown as discontinued and replaced by the boxed service version 8401-006BX or the updated S8401-006, so verify your unit model and the contactor coil and pole ratings before ordering to ensure an exact fit and correct operation.