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The Bard 8401-038 is an OEM 2-pole 40 amp contactor with lugs used to switch high-voltage power to key loads in Bard wall-mount air conditioners and heat pumps, most commonly for compressor control. When a contactor is pitted, buzzing, chattering, or sticking, replacing it with the correct Bard part helps restore reliable starts and proper system operation while keeping the low-voltage call for cooling safely isolated from the line side. Match this part to your unit model and wiring diagram to confirm pole count, amp rating, and coil/control voltage before installation.