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Bard part 8402-107 is an OEM high temperature limit control designed to protect the heater section by opening the safety circuit if the unit overheats, helping prevent damage to electric heat components and reducing nuisance shutdowns when the correct rating is used. This L155-30 limit is supplied with a 3 inch standoff for proper sensing position and mounting depth in Bard wall mount and related commercial HVAC equipment. When replacing a limit, always match the exact temperature rating and mounting style shown on your unit data label or service manual to ensure correct operation and safe cycling.