The Factory-set Pressure Switch 903

Designed for Lower Switching Values

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.

Applications of 903 low-pressure Switch

  • Wastewater technology
  • Liquid level measurement
  • Pump control
  • Medical technology and many more.

Technical Data of the Factory-set Pressure Switch 903

Temperature range

Ambient temperature –20° C to 85° C

Diaphragm material


Electrical rating

Standard version:

max. 6 (1.5) A / 250 VAC
max. 10 (2) A / 250 VAC
max. 2 A / 24 VDC

Low-voltage version :

max. 100 mA / 24 VAC
max. 30 mA / 24 VDC

Electrical connection:

Tab terminal 6.3 mm x 0.8 mm in accordance with DIN 46244

Pressure connection

Combined hose and threaded connection: 6.5 mm and G1/4, PPS


Restrictors alternatively with 0.3/0.5/0.8 mm diameter


IP00 without protection cap
IP 54 / IP 65 depending on the used protection cap

Protection class

Protection class II is only met by using a protection cap from our accessories program.

The pressure switch without the protection cap is provided for installation in equipment. The construction of the equipment and the type of installation determine the protection class.


Please do read instructions before use. This regulating and control unit must be installed in compliance with the applicable regulations


EU Low Voltage Directive EU RoHS Directive


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