QPH31.280A00 Siemens Pressure Switch

Overview

The Siemens QPH31.280A00 is a high-performance automatic reset pressure switch specifically engineered for the supervision of gas or air pressures in industrial and commercial burner applications. Designed to enhance system safety, this switch breaks the electrical circuit when the pressure rises above the user-adjusted setpoint. It is a critical component for monitoring high-pressure conditions in gas trains and combustion systems, offering reliable performance with a compact and durable design.

Features

• Automatic reset functionality ensures the switch returns to its normal state once pressure falls back below the setpoint
• Adjustable pressure range allows for precise field settings to meet specific application requirements
• Surge protection up to 15 psi prevents damage from sudden pressure spikes
• Ventless installation capability simplifies setup and reduces the need for additional piping
• Durable construction featuring a 1/4-inch NPT female pressure connection
• UL listed for the USA and Canada, FM approved, and ISO 9001 certified for high quality and safety standards

Specifications

• Part Number: QPH31.280A00
• Pressure Range: 28 to 112 inches water column (70 to 280 mbar)
• 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
• Enclosure Rating: Typically NEMA 1 (suitable for indoor use)

Applications

• Supervision of high gas or air pressures in industrial burner gas trains
• Monitoring and control of high-pressure conditions in commercial HVAC systems
• Integration into safety limit circuits for boilers and furnaces
• Use in various combustion systems where automatic reset high-pressure protection is required