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Bard part number 8402-203 is an OEM thermal cutoff (thermal fuse) used in Bard wall mounted HVAC equipment to protect the unit from unsafe overheating by opening the electrical circuit when the cutoff temperature is reached. This is a one time, non resettable safety device, so if it has opened due to an overtemperature event it must be replaced rather than reset, and the root cause of overheating should be addressed before returning the unit to service. If your service literature calls out THERMAL CUTOFF G5AM0600093C, 8402-203 is the correct Bard replacement part to restore the factory designed temperature protection and wiring compatibility.
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