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The Bard 8201-153 is an OEM 3-way isolation relay used in Bard HVAC equipment to interface a 0 to 10 VDC control signal with system control circuitry while keeping control and load circuits electrically separated for stable, noise-resistant operation. This relay is commonly applied where a building automation or analog output needs to safely command equipment functions without feeding interference back into sensitive controls. If you are replacing a failed relay, match the part number exactly and confirm your unit model and wiring application, since isolation relays are often tied to specific control sequences and board outputs on Bard wall-mount systems.