SUCO Pressure Switches PLUS with NAMUR Resistor

At bauma 2019, SUCO will introduce its pressure switches PLUS with NAMUR resistor which enables additional features such as fail-safe and diagnostic functions.


Under the brand name 'Pressure switches PLUS', SUCO offers the second generation of its integrated pressure switches.

  • PLUS stands for additional electronic functions that can be integrated as needed to meet customer or application requirements 
  • Additional functions include NAMUR diagnostic function, protective function via varistor, NTC/PTC thermistor or LED stating switching status
  • Features high IP protection class (IP67 to IP6K9K)
  • Resistor circuit according to NAMUR offers additional diagnostic function (fail-safe) with short-circuit and cable break detection
  • According to DIN EN 60947-5-6 (VDE 0660 part 212), NAMUR is a switching contact with two resistors that can act as a normally closed (NC) or normally open (NO) contact
  • Additional wiring makes it possible to query not only the states ON and OFF, but also a line break (LB) or short circuit (SC) 
  • Typical current thresholds according to NAMUR are 1.2 mA for the off state and 2.1 mA for the on state
  • Potential-free and supplied directly via measuring circuit (operating current IB)
  • Live parts are electrically isolated from housing, i.e. there is no electrical connection between switching contact and housing
  • Current level is permanently present at output of pressure switch, irrespective of whether the contact is activated or not, due to resistor circuitry
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