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Bard part number 8401-025 is an OEM 2-pole, 40 amp HVAC contactor with a 24V coil that serves as the heavy-duty switching relay for high-voltage loads like the compressor, condenser fan, or electric heat circuits in many Bard wall-mount and packaged systems. When a contactor becomes pitted, noisy, or intermittently drops out, it can cause hard-starting, nuisance shutdowns, and overheating at the contacts, so replacing it with the correct Bard-specified contactor helps restore reliable call-for-cooling or call-for-heat operation and proper electrical performance. This part number is widely shown as discontinued and commonly superseded by a boxed replacement, so confirm the exact replacement part number and application by model and serial before ordering.