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Bard part number 8201-045 is an OEM time delay relay with a 24 volt coil and SPDT contacts, used in Bard wall mounted HVAC equipment to introduce a controlled delay before a circuit changes state. In the field, this type of relay is commonly used to sequence components like blower and compressor circuits so the unit starts and transitions smoothly, helping reduce nuisance trips and contact wear compared to an incorrect substitute. Use it when troubleshooting symptoms like short cycling, out of sequence operation, or a delay function that no longer times consistently, and match the wiring to the original SPDT terminal arrangement to maintain proper control logic.