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Bard 8201-015 is an OEM 24-volt control relay used in Bard wall-mounted HVAC equipment to let a low-voltage call safely switch a higher-voltage circuit. With a 24 V coil and a 1P normally open plus 1P normally closed contact arrangement rated 3A at up to 277V, this relay is commonly applied for functions such as emergency heat staging or similar control logic where both NO and NC outputs are needed. Replacing a weak or intermittent relay with the correct Bard part helps prevent nuisance lockouts and inconsistent operation, and it ensures proper electrical fit and dependable switching in the factory control circuit.