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Bard part number 8401-002 is an OEM 3 pole 25 amp contactor with a 24V coil used to switch high voltage loads in Bard wall mounted packaged air conditioners and heat pumps, commonly controlling the compressor circuit so the unit can start and run reliably when the thermostat calls. Replacing a worn or pitted contactor can resolve intermittent cooling, chattering, or no start issues while helping protect other electrical components from nuisance overheating. Match the pole count and amp rating to your original part and confirm your unit model and wiring layout before installation to ensure proper fit and safe operation.