QPL31.075A00 Siemens Pressure Switch

Overview

The Siemens QPL31.075A00 is an automatic reset low-pressure switch designed for monitoring gas or air pressure in commercial and industrial burner applications. As part of the QP Series, this switch provides a critical safety function by breaking the electrical circuit when the pressure drops below the user-defined setpoint. Its robust design and high-precision monitoring make it a reliable component for ensuring safe combustion processes in HVAC and boiler systems.

Features

• Automatic reset functionality ensures the switch restores the circuit once pressure returns to safe levels
• Adjustable pressure range from 5 to 30 inches water column (WC)
• Ventless installation capability simplifies mounting and reduces setup costs
• Surge protection up to 15 psi protects the internal diaphragm from momentary pressure spikes
• Durable construction suitable for demanding industrial environments
• Versatile mounting options allow for horizontal or vertical installation

Specifications

• Model: QPL31.075A00
• Pressure Range: 5 to 30 inches WC (12.5 to 75 mbar)
• Reset Type: Automatic
• 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: -40 F to 140 F (-40 C to 60 C)
• Pressure Connection: 1/4-inch NPT female
• Protection Rating: IP54

Applications

• Gas or air pressure supervision for industrial and commercial burners
• Low-pressure limit monitoring in gas trains of gas-fired equipment
• Integration into HVAC and boiler safety control systems
• Use in air flow monitoring for ventilation and industrial process air systems
• Compatible with a wide range of gas families (I, II, and III)