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The Bard 8402-219 limit control is an OEM temperature safety switch used in Bard wall mounted HVAC equipment to help prevent overheating by opening the circuit when the sensed temperature reaches its trip point, then allowing operation to resume once temperatures return to a safe range. Listed as Limit Control 155-50F/185BU, this control is commonly used in heating sections and airflow temperature monitoring locations where reliable high limit protection is required for safe operation and to reduce nuisance shutdowns caused by incorrect substitutions. For best fit, confirm your unit model and original limit control specifications before ordering Bard part 8402-219.