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Bard part 8201-133 is an OEM time delay relay used in Bard wall mounted HVAC equipment to add a controlled delay to a circuit during startup or shutdown sequences. In the field, this type of relay is commonly used to help prevent nuisance short cycling and to allow loads like compressors, blowers, or control circuits to energize in the proper order, which improves reliability and protects components. Because timing and wiring style matter on these controls, confirm the correct Bard part number from your unit model and serial tag or the unit parts list before ordering, then replace one for one to restore normal timed operation.