Field Controls 46086400 Safety Switch

The Field Controls 46086400, also designated as the Model GSK-3, is a high-reliability thermal safety switch engineered for installation on residential and light commercial gas furnaces, boilers, and water heaters. This SPST manual reset switch acts as a critical fail-safe by monitoring for flue gas spillage caused by blocked flues, continuous downdrafts, or inadequate draft conditions. When the sensing element reaches 180 degrees Fahrenheit, the normally closed circuit opens, immediately de-energizing the burner or burner control to prevent carbon monoxide infiltration.

Built with standard gold contacts, the GSK-3 ensures low-resistance connectivity in both millivolt (30mV) and 24VAC control circuits. This versatility makes it a staple for technicians servicing sidewall venting systems or power-vented appliances. Because it is a manual reset device, it requires a professional inspection of the venting system before the burner can be restarted, ensuring that the root cause of the spillage is addressed. The robust design and precise temperature calibration provide the technical accuracy required for HVAC safety compliance and peak system performance.

• Enhanced System Safety: Specifically designed to detect hazardous flue gas spillage and shut down the heat source.
• Universal Compatibility: Works seamlessly with 24VAC systems and millivolt-controlled fireplaces or water heaters.
• Reliable Switching: Features gold-plated contacts to prevent oxidation and ensure reliable signal transfer in low-voltage applications.
• Manual Intervention: Ensures a technician must inspect the appliance after a thermal trip, preventing repeated cycling under unsafe conditions.
• Rugged Temperature Sensitivity: Pre-calibrated 180°F trip point optimized for detecting spillage at the draft hood or barometric control.

What causes a GSK-3 thermal switch to trip?
A trip usually indicates a venting failure, such as a bird's nest in the chimney, a blocked flue pipe, or excessive negative pressure in the mechanical room causing the flue gases to spill back into the space.

Can the GSK-3 be used in series with other safety limits?
Yes, this switch is designed to be wired in series with the burner's 24V or millivolt thermal circuit, providing an additional layer of protection alongside high-limit or roll-out switches.

Is the 46086400 compatible with oil applications?
While primarily used in gas-fired applications, this thermal safety switch is rated for use in various burner circuits requiring a manual-reset thermal cutout.

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.