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The Bard 8402-116 is an OEM temperature limit switch used as a high-limit safety in Bard wall-mounted HVAC equipment, helping protect the heater section by opening the circuit if abnormal temperatures occur and allowing operation to resume after the unit cools. Identified as an L300-30 style limit with a blue label and 3/4 inch deep cup sensing design, this switch is selected for proper trip and reset behavior in factory-approved applications, so matching the exact Bard part number is the safest way to restore original protection and keep troubleshooting straightforward when a unit is cycling on limit.