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The Bard S8401-006 is an OEM 2-pole contactor rated 20 amps with a 24V coil, used in Bard wall-mounted HVAC equipment to reliably energize and isolate high-voltage loads like the compressor and condenser fan when the control circuit calls for operation. When a contactor starts chattering, pitting contacts, or intermittently dropping out, replacing it with the correct Bard part helps restore proper electrical switching and protects connected components from low-voltage control issues and overheating at the contact points. Match ratings and wiring to your unit schematic and verify coil voltage and pole configuration before installation, since contactors are a critical safety and reliability component in the control circuit.