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Bard 8402-025 is an OEM thermal cut off (manufacturer reference 4K9208H) used as a safety temperature limit in Bard HVAC equipment, commonly in wall-mount heater and electric heat applications. When abnormal heat conditions occur, this one-time protective device opens the circuit to help prevent overheating damage to the heater assembly and surrounding components. Replace it with the correct Bard part number to maintain proper safety operation and ensure the replacement matches your unit’s wiring and temperature rating specified in the Bard service literature.