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Bard part number 8620-041 is an OEM isolation relay kit used in Bard wall-mount and packaged HVAC equipment to electrically separate a control signal from the load it operates, helping protect sensitive controls while ensuring reliable switching of connected accessories or external circuits. If you are troubleshooting intermittent operation or need to interface a Bard unit with third-party controls, alarms, or other field wiring, replacing the relay with the correct Bard kit helps restore proper control logic and reduces the risk of nuisance issues caused by mismatched coil or contact ratings. Because relay applications vary by model and control scheme, confirm the correct placement and wiring using your unit wiring diagram or service manual before ordering.