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Bard part 8401-011 is an OEM 3 pole 30 amp definite-purpose contactor used in Bard wall-mounted HVAC equipment to switch higher-voltage loads from a low-voltage control signal, helping reliably start and stop components like compressors and fan motors when the thermostat or control board calls. Replacing a worn contactor can address symptoms such as chattering, intermittent operation, or a unit that will not start, and using the correct Bard OEM contactor helps maintain proper electrical fit, coil control compatibility, and safe, consistent operation. Before ordering, confirm the pole count, amp rating, coil voltage, and terminal style match your existing contactor and your Bard model requirements.