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The Bard S8401-007 is a genuine OEM 1 pole, 25 amp contactor with a 24 VAC coil used in many Bard wall mount and packaged HVAC units to reliably switch high voltage power to loads like the compressor and outdoor fan when the thermostat calls. If your unit is chattering, failing to pull in, or showing pitted contacts, replacing the contactor is a common repair that restores dependable start and run operation while keeping the control circuit working as designed. Match the coil voltage and amp rating, then confirm the part number S8401-007 against your unit’s wiring diagram or parts list to ensure correct fit and terminals before ordering.