CSN® thyristor step control type STSTR

Maximum control precision with our advanced thyristor stage control: PLC controllers, precise thyristor controllers and fixed contactor stages ensure optimum control quality.


Optimise your control processes with our advanced CSN® thyristor stage control. The combination of PLC controller, precise thyristor controllers and fixed contactor stages ensures outstanding control quality at all operating points. Trust in our reliable and efficient technology for a first-class control experience.

Product benefits

  • Coordinated complete package with heater from a single source
  • Detailed CAD design with E-Plan P8 and Pro Panel
  • PLC programming with Siemens Step 7 / TIA Portal
  • Design in accordance with Low Voltage Directive 2014/35/EU and IEC 61439 (low-voltage switchgear and controlgear assemblies)
  • In-house, digitalised production
  • Components from the market leaders (Siemens, ABB, Jumo, Phoenix Contact, Rittal,...)
  • Extensive coordination of heaters, actuators (valves, pumps, etc.), sensors and control technology or safety technology

Technical data


1 kW to 20MW


230V AC, 400V AC, 690V AC, all special voltages within the Low Voltage Directive (including DC)

Options / customisation options

  • Extended signal exchange (setpoint specification, releases, etc.)
  • Remote access to PLC via GSM router and VPN tunnel for commissioning support, maintenance and troubleshooting
  • Intrinsically safe circuits (Ex i) for connecting a heater in hazardous areas
  • BUS connection of the system
  • Commissioning by Schniewindt technicians with control optimisation, connection to customer control system and acceptance preparation
  • System visualisation and operation via touch panel (HMI)
  • Air conditioning units for high ambient temperatures
  • Frost protection heaters for low ambient temperatures
  • Outdoor equipment
  • Adaptation to railway, marine and nuclear technology regulations
  • Assembly / delivery on skids, on racks or in containers
  • Functional safety classification of the switchgear according to SIL (Safety Requirement Level / Safety Integrity Level) in accordance with IEC 61508/IEC61511

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