Overview
The Siemens QPH32.020M00 is a manual reset high gas pressure switch designed for commercial and industrial burner applications. This high-precision device is engineered to detect high-pressure conditions by monitoring gas or air pressure and breaking the electrical circuit when the pressure rises above the adjusted setpoint. Built with a NEMA 4 rating, it is suitable for both indoor and outdoor installations, providing reliable safety supervision for various gas-fired equipment.
Features
- Manual reset mechanism requires physical intervention once the pressure exceeds the setpoint
- Designed for use with natural gas, propane, butane, hydrogen, biogas, and air
- NEMA 4 rated enclosure for protection against harsh outdoor environments
- Ventless operation capability up to 7 psig for streamlined installation
- Built-in side test connection for easy manometer or pressure gauge integration
- cULus and FM approved for safety and performance compliance
Specifications
- Pressure Range: 2 to 20 inches water column (wc)
- Maximum Operating Pressure: 15 psig
- Ventless Pressure Rating: 7 psig
- Temperature Rating: -40 F to 140 F (-40 C to 60 C)
- Electrical Rating: 24 VAC to 125 VAC, 24 VDC to 48 VDC
- Connection: 1/4 inch NPT (+) pressure connection
- Materials: Die-cast aluminum lower body with a fiberglass-reinforced plastic upper body
Applications
- High gas pressure supervision in gas trains for industrial and commercial burners
- Safety shut-off monitoring in heating, ventilation, and air conditioning (HVAC) systems
- Pressure monitoring for specialized gas mixtures including hydrogen and biogas
- Integration into OEM burner control systems requiring manual reset safety features


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