Bard HVAC 8406-037BX Switch

The Bard 8406-037BX is a critical safety component designed for high-limit temperature monitoring in HVAC blower assemblies and heat sections. This 220F manual reset temperature switch serves as a direct functional replacement for the 8406-037, ensuring seamless integration into existing Bard wall-mount units and furnace configurations. Operating as a normally closed (NC) contact, this limit control switch interrupts the 24V or line voltage circuit to the heating elements if the discharge air or internal heat exchanger temperature exceeds the 220-degree Fahrenheit threshold. The manual reset feature is essential for diagnostic purposes, requiring a technician to physically inspect the unit for airflow obstructions, motor failure, or evaporator coil issues before restoring operation. Constructed with a durable bimetal sensing element and a robust mounting flange, the Bard 8406-037BX HVAC switch provides precise thermal protection, preventing equipment damage and ensuring adherence to safety protocols in commercial and industrial climate control applications.

• Precise Thermal Trip Point: Calibrated to 220°F specifically for high-limit protection in Bard climate control systems.
• Manual Reset Mechanism: Facilitates troubleshooting by ensuring the HVAC safety switch remains open until the underlying fault is addressed.
• Direct OEM Interchange: Fully compatible where Bard part number 8406-037 is specified, maintaining original equipment specifications.
• Simple Installation: Standard two-wire terminal configuration allows for rapid field replacement during emergency service calls.

Is the 8406-037BX an exact replacement for the standard 8406-037?
Yes, the 8406-037BX is technically identical to the 8406-037 in form, fit, and function, including the 220F trip point and manual reset button.

What causes this high-limit switch to trip frequently?
Repeated tripping usually indicates low airflow caused by a clogged filter, a failing blower motor, or restricted ductwork, triggering the manual reset temperature switch to prevent overheating.

Can this switch be used in 24V and 120V circuits?
This Bard limit switch is rated for standard control circuit voltages common in Bard wall-mount and HVACR units.

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.