Supco SHL511 Plenum Thermostat 140-160°F Temperature Range Limit Switch

The Supco SHL511 is a plenum thermostat limit switch designed for HVAC heating systems to prevent overheating in furnace plenums. This safety control automatically opens the circuit when the temperature exceeds safe operating limits and closes when the temperature returns to normal range.

Key Features:

• Temperature range: 140°F to 160°F with automatic reset functionality
• Compact dimensions: 3.12" length × 1.625" width × 1.44" height for easy installation in tight spaces
• L160-20F limit switch configuration for reliable overheating protection
• Direct replacement for compatible residential and light commercial furnaces
• Automatic operation eliminates manual intervention after temperature normalization

This plenum thermostat is commonly used as a safety device in forced air heating systems to protect the heat exchanger and ductwork from excessive temperatures. The automatic reset feature allows the system to resume normal operation once the temperature drops below the setpoint, minimizing service calls and downtime.