CSN® Thyristor control type STTR

Our CSN® thyristor control, consisting of a combination of microprocessor controllers and PLC controllers with thyristor actuators, guarantees precise and wear-free control.


Our CSN® thyristor controller impresses with its outstanding features: The use of microprocessor controllers and PLC controllers in combination with thyristor controllers ensures precise control without wear. The full oscillation cycle principle effectively eliminates mains feedback.

Product advantages

  • Simple controller output is sufficient, no step controller required
  • No mains feedback due to the use of the full oscillation cycle principle
  • Standard product range up to 300kW quickly available
  • 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 20 MW


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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