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Bard part 8401-016 is an OEM 1-pole 35 amp contactor used in Bard wall-mounted air conditioners and heat pumps to switch high-voltage power to major loads such as the compressor or condenser fan when the low-voltage control circuit calls for operation. A properly functioning contactor helps prevent intermittent starts, overheating at the contacts, and nuisance shutdowns by providing a clean, reliable electrical connection under load. Because 8401-016 has been superseded in many parts lists, confirm the exact replacement part number for your specific Bard model and serial before ordering to ensure correct coil voltage, mounting, and terminal configuration.