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Siemens QBM81 Series Differential Pressure Switch

KSh 4790

Siemens QBM81 Series Differential Pressure Switch specifically designed for monitoring under an overpressure in ventilation.

Application: In ventilation and air conditioning plants to Monitor differential pressure, under pressure and overpressure, Monitor air filters and airflows, Recognize torn fan belts and Differential pressure switches can be used in cleanrooms, kitchens,, etc.


Siemens QBM81 Series Differential Pressure Switch measures air and non-aggressive gases which are easy to mount also feature switching cycles, highly precise setting, and long-term stability. For ventilation and air conditioning plants. This siemens pressure switch with single pole change over output has a pressure range of 20 to 5000 Pa. Siemens Pressure Switch has an IP54 protection class and a temperature range of 0 to 70 °C.

  • To monitor air filters, airflow, fan belts
  • To monitor the pressure in clean rooms, kitchens, etc.
  • Siemens Pressure Switch is easy to mount
  • >1 Mio switching cycles
  • Highly precise setting
  • Siemens Pressure Switch has Long-term stability.

Additional information



Model No

QBM81-10 : 1 to 10 mbar, QBM81-10 : 100 to 1000 Pa, QBM81-20 : 5 to 20 mbar, QBM81-20 : 500 to 2000 Pa, QBM81-3 : 0, 2 to 3 mbar, QBM81-3 : 20 to 300 Pa, QBM81-5 : 0, 5 to 5 mbar.

Type Of Switch

Single-pole change-over, multi-layer contact

Electrical Connection

3 screw terminals


Sheet-steel (galvanized)

Operating Temperature

–30 °C to 85 °C

Operating Humidity

Less than 90 % RH (non-condensing)

Storage Temperature

–40 °C to 85 °C


EN 61326-x Electrical equipment involved in measurement, control,and laboratory use; EMV requirements; general requirements

Cable Entry

PG11 cable gland


Fiber-glass reinforced polycarbonate


Provided alongwith and valid for 1 year, traceable to National Standards.


250 Grams

Weight N/A
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Siemens QBM81 Series Differential Pressure Switch

KSh 4790

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