Pressure Switch – Beck 903 Series


  • For lower switching values
  • Conformity
    EU Low Voltage Directive
    EU RoHS Directive

Pressure switch 903 factory-set from -5 to 5 mbar.

Factory-set pressure switch monitoring overpressure of liquid and gaseous media. Pressure setting and switching differential are factory set by the manufacturer.


  • Wastewater technology
  • liquid level measurement
  • pump control
  • medical technology
  • and many more


Temperature range Ambient temperature from –20°C to 85°C
Temperature of media up to 85°C or 130°C depending on diaphragm and pressure connection material..
Diaphragm material NBR
Pressure connection Material: PPS
Combined hose and threaded connection:
Hose nipple: 6,5mm
Thread: G1/4
Electrical rating Standard version:
max. 6 (1,5) A / 250 VAC
max. 10 (2) A / 250 VAC
Low voltage version:
max. 100 mA / 24 VAC
max. 30 mA / 24 VDC
Electrical connection AMP flat plug 6.3 x 0.8 mm according to DIN 46244
Protection class IP54 / IP65 depending on the used protection cap. IP00 without protection cap.
Type Factory-set switching points between Maximum positive working pressure Maximum negative working pressure
Standard/extended Standard/extended
903.1 2 mbar and 5 mbar 300 mbar -80 mbar
903.20 -2 mbar and -5 mbar 300 mbar -80 mbar


Beck 903 Pressure switch factory-set from -5 to 5 mbar–DpstarGroup