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The Bard 8401-003 contactor assembly is a 1-pole, 30 amp OEM switching device used in Bard wall-mounted air conditioners and related packaged equipment to let a low-voltage call from the thermostat energize the coil and safely route line voltage power to key loads such as the compressor and fan circuit. Replacing a worn or pitted contactor helps resolve common no-cool or intermittent operation issues caused by chattering, burned contacts, or a weak coil, while maintaining the correct fit and electrical characteristics Bard equipment is designed around. Confirm pole count, amp rating, coil voltage, and terminal style against your unit wiring diagram before ordering to ensure a direct match.