Laars E2074501 0.3"wc SPST Pressure Switch

The Laars E2074501 is a Single Pole Single Throw (SPST) pressure switch designed for use in residential and commercial heating systems. This safety control is calibrated to activate at 0.3 inches water column ("wc), making it ideal for monitoring air pressure in combustion air systems and vent systems.

Key Features:

• SPST (Single Pole Single Throw) electrical configuration for simple on/off switching
• Factory-set activation point at 0.3 inches water column pressure differential
• Designed for use with Laars boilers and water heaters
• Functions as a safety interlock to ensure proper air flow before burner operation
• Reliable mechanical pressure sensing mechanism
• Compact design for easy installation in tight spaces

This pressure switch is commonly used as a combustion air proving switch or vent pressure switch, ensuring that adequate air flow or draft is present before allowing the heating system to operate. It helps prevent unsafe operating conditions by monitoring pressure differentials in the system.