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Operating Mechanism

Flexball – flexible transmission / drive rod

Flexball – flexible transmission / drive rod



  • Ideal for railways tunnel installation: flexible transmission system perfectly suits tunnel wall and complex installations, allowing safe circulation of rolling stock.
  • SDCEM is the world reference of switches with flexible transmission since 1990 (more than 12 million hours without any failure).
  • It can be spatially laid on all the three dimensions (up to 180° in one loop).
  • It can operate in severe environmental conditions such as moisture, condensation or icing, without impact on performance.
  • Temperature variations have no effect on flexible transmission.


  • Robust and reliable: stainless steel components.
  • Easy installation: ideal for tunnels or complex HV switch metallic structure (mast, portals).
  • High mechanical efficiency.
  • Maintenance free: no maintenance or lubrication is necessary.

caracteristics of flexible transmission


From project design through disconnectors installation and after sales customer service, SDCEM SERVICES specialists provide worldwide customer services to maintain quality and reliability throughout equipment’s service life: