The Siemens QBM81-3 differential pressure switch is designed for use in ventilation and air conditioning systems to monitor air filters, airflow, and fan belts. It can also be used in clean rooms and kitchens to monitor differential, underpressure, and overpressure conditions. With a pressure range of 0.2–3 mbar, this switch is ideal for ensuring system efficiency and preventing malfunctions. The QBM81-3 offers precise switching, long-term stability, and over 1 million switching cycles, making it highly reliable for long-term use.

Key Features:

• Pressure range: 0.2–3 mbar (20–300 Pa)
• Over 1 million switching cycles
• Suitable for air and non-aggressive gases
• Ideal for HVAC systems, clean rooms, and kitchens
• Easy installation with duct adaptors and 2-meter tubing included

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