QPH31.050M00 Siemens Pressure Switch

Overview

The Siemens QPH31.050M00 is a manual reset high-pressure switch designed to monitor gas or air pressure in industrial and commercial burner applications. Part of the Siemens QP series, this safety device is engineered to break the electrical circuit when the pressure rises above a pre-set value, ensuring the system remains within safe operating limits. It is a critical component for preventing hazardous conditions in HVAC and combustion systems.

Features

• Manual reset mechanism requires human intervention to restore the circuit after a high-pressure trip
• Adjustable pressure range allows for precise setpoint selection
• High-pressure limit functionality breaks the circuit on pressure rise
• Durable construction suitable for demanding industrial environments
• UL listed for the USA and Canada, FM approved, and ISO 9001 certified
• Integrated surge protection capable of handling up to 15 psi for brief periods
• Ventless installation design for simplified mounting

Specifications

• Model: QPH31.050M00
• Pressure Range: 2 to 20 inches Water Column (WC)
• Reset Type: Manual
• Electrical Rating: 10A @ 125 to 250 Vac; 1/3 HP @ 125 to 250 Vac
• Maximum Operating Pressure: 6 psi (400 mbar)
• Maximum Surge Pressure: 15 psi (1 bar) for 2 seconds
• Operating Temperature Range: -40 F to 140 F (-40 C to 60 C)
• Pressure Connection: 1/4-inch NPT female

Applications

• High-pressure supervision for gas and air in industrial burner systems
• Monitoring gas trains in commercial gas-fired equipment
• Integration into HVAC safety control circuits to prevent over-pressure conditions
• Use in boiler and combustion systems to ensure safe and efficient operation