Bard 8402-143 Switch

The Bard 8402-143 Switch is a high-performance L155-30 limit control designed specifically for Bard HVAC equipment. This OEM replacement part features an exposed face and an automatic reset mechanism, making it critical for maintaining safe operating temperatures in industrial and commercial wall-mount units. Engineered with a temperature rating of 155°F to open and a 30°F differential to reclose, this primary limit switch ensures the heating circuit is interrupted before the heat exchanger reaches unsafe levels. Its rugged construction is built for longevity in demanding environments, preventing system overheating while reducing nuisance lockouts. For field technicians, the 8402-143 offers a direct-fit solution, ensuring electrical compatibility and reliable thermal protection in Bard air conditioning and heating systems. Using this genuine component restores original equipment specifications and maintains the thermal safety integrity required for professional HVAC maintenance and repair service calls.

• Precise Thermal Protection: Rated for an L155-30 fixed setpoint to accurately monitor supply air temperatures.
• Automatic Reset Functionality: Restores circuit continuity automatically once temperatures drop by 30°F, ensuring consistent airflow monitoring.
• OEM Compatibility: A genuine Bard replacement part designed for seamless installation in specific wall-mount and package units.
• Durable Exposed Face Design: Built to withstand commercial HVAC system stresses and provide long-term reliability.

What does the L155-30 rating on the Bard 8402-143 signify?
The L155-30 rating indicates a high-limit opening temperature of 155°F and a differential of 30°F. The switch will trip (open) if the temperature hits 155°F and will automatically reset (close) once the temperature falls to 125°F.

Can I use an 8402-143BX instead of an 8402-143?
Yes. In Bard HVAC parts nomenclature, the "BX" suffix typically refers to individual boxed packaging and does not indicate a difference in technical specs or physical dimensions. They are functionally identical.

Why is my Bard unit tripping this limit switch?
Frequent tripping usually points to restricted airflow, such as dirty filters, a failing blower motor, or blocked ductwork. Verification of HVAC system static pressure and temperature rise is recommended when installing a new 8402-143 switch.

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Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.