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The Bard 8402-213BX limit control is an OEM temperature safety switch used in Bard wall mount HVAC equipment to help prevent overheating by opening or closing a control circuit when a set temperature is reached. This control is commonly applied in the heat section or supply air path where reliable temperature sensing is critical to protect heaters, wiring, and surrounding components during abnormal operating conditions such as restricted airflow. Because limit controls can vary by cutout and reset characteristics across Bard model families, match 8402-213BX to your unit model and existing control before ordering to ensure proper fit and correct system protection.
Bard uses suffixes like "BX" to manage parts internally. These do not change the physical form or function of the part.
A part number ending in "BX" simply means it is packaged in a box for shipping, rather than for internal assembly use.
Example: 8406-142BX is physically identical to 8406-142.