Supco SHL519 Plenum Limit Switch 155-125°F Thermostat

The Supco SHL519 is a plenum-mounted limit switch designed to protect HVAC systems from overheating. This safety control thermostat automatically cuts power to the heating system when plenum temperatures exceed safe operating limits, then restores power once temperatures return to normal.

Key Features:

• Temperature range: 155°F cut-out, 125°F cut-in (automatic reset)
• Snap-disc bimetal design for reliable operation
• Mounts directly in furnace plenum for accurate temperature sensing
• SPST switching action for simple wiring integration
• Protects against damage from blocked airflow, dirty filters, or blower failure
• UL recognized component for safety compliance

This limit switch is essential safety equipment for residential and light commercial furnaces, providing automatic temperature protection to prevent heat exchanger damage and potential fire hazards. The automatic reset feature eliminates the need for manual intervention once the problem is corrected and temperatures normalize.