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Bard part 8402-200 is a 150 degree one-shot limit control used as a safety temperature cutout in Bard HVAC equipment, commonly applied in wall-mounted units with electric heat where overheating protection is required. When the sensed temperature reaches its set point, this OEM limit opens the circuit to help protect heaters and surrounding components from excessive heat conditions. For a reliable repair, match this limit control to the exact Bard model and wiring configuration listed on your unit documentation, since one-shot limits typically require replacement after they trip rather than resetting.