QPH31.050A00 Siemens Pressure Switch

Overview

The Siemens QPH31.050A00 is an automatic reset high-pressure switch designed to monitor gas or air pressures in industrial and commercial burner applications. Part of the QP series, this switch serves as a critical safety component by breaking the electrical circuit when the pressure increases above the manually adjusted setpoint. It is engineered for durability and precision, ensuring reliable performance in demanding HVAC and combustion environments.

Features

• Automatic reset functionality triggers once pressure returns to the safe operating range
• Adjustable pressure range from 2 to 20 inches water column (wc)
• UL listed for USA and Canada, FM approved, and ISO 9001 certified
• Ventless installation capability for simplified setup
• Built-in surge protection up to 15 psi to withstand momentary pressure spikes
• Transparent cover allows for easy viewing of the range scale and adjustment dial

Specifications

• Pressure Range: 2 to 20 inches water column (5 to 50 mbar)
• Reset Type: Automatic
• Maximum Operating Pressure: 6 psi (400 mbar)
• Maximum Surge Pressure: 15 psi (1 bar) for 2 seconds
• Electrical Rating: 10A @ 125 to 250 Vac; 1/3 HP @ 125 to 250 Vac
• Operating Temperature: -40 F to 140 F (-40 C to 60 C)
• Pressure Connection: 1/4 inch NPT female
• Weight: Approximately 1.0 lb

Applications

• High-pressure supervision for gas trains in gas-fired equipment and burners
• Monitoring of air or neutral gaseous media in commercial heating systems
• Integration into burner control systems to prevent overpressure conditions
• Use in industrial combustion processes requiring precise safety shut-off controls