Imagine a cold winter night with your family gathered around a warm fireplace, enjoying the comfort of home. Yet lurking in the background could be invisible dangers like flue gas leaks that silently threaten your family's safety. Thermal safety switches provide peace of mind by guarding against these potential hazards.

Thermal safety switches are electromechanical devices that respond to temperature changes to control electrical circuits. When environmental temperatures reach predetermined thresholds, internal contacts open or close to interrupt or restore circuit connections. In gas appliances, these devices are often called "thermal cutoff switches" and play a critical safety role.

These electrical safety devices interrupt current when temperatures rise to specific levels. They may be single-use or feature manual/automatic reset functions. Their operation relies on heat-sensitive components that trigger switch actions when temperatures exceed safe limits, preventing potential dangers.

The company offers various thermal safety switches designed for different applications. All models undergo rigorous testing and certification to ensure stable, reliable performance in protecting both gas appliances and personal safety.

• WMO-1: Designed for oil burner applications in forced-air and chimney venting systems (10A/120V, manual reset at 200°F/93°C)
• FTS-4: For draft hood or vent damper installations (12A/120V, manual reset at 140°F/60°C)
• FTS-6: For equipment exceeding 400,000 BTU/hr (12A/120V, manual reset at 180°F/82°C)
• GSK-3: Gold-contact switch for gas millivolt or 24 VAC applications (manual reset at 180°F/82°C)
• LS-550A: For Type B vent applications with automatic reset (15A/120V at 550°F/288°C)

Field Controls offers two primary switch configurations:

• SPST (Single Pole Single Throw): Features one input and one output for basic circuit control
• SPDT (Single Pole Double Throw): Includes one input and two outputs for more complex switching applications

Professional installation by licensed contractors is essential for proper thermal safety switch operation and compatibility with gas appliances. Incorrect installation may create safety hazards or potentially dangerous situations.