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The Bard 8201-149 solid state relay is an OEM 5A switching component used on Bard wall mounted HVAC equipment control panels to reliably control electrical loads without mechanical contacts, helping maintain consistent operation where a fast, dependable relay is required. This relay is specified in Bard parts lists for the control panel assembly, making it a correct-fit replacement when diagnosing relay related failures such as intermittent operation or a load that will not energize. Confirm the part number 8201-149 against your unit model and wiring diagram before ordering to ensure proper match and safe installation.