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Safe Coupling Relays

In the process industry safe coupling relays are often used for coupling safety related signals, for example output signals of a safe control system to the periphery. The use of simple relays would result in the interruption of the safety chain and therefore a safe shutdown in case of failure could not be guaranteed.

This problem can be solved by using safe coupling relays. Redundantly built, self-monitoring coupling relays allow the standardized coupling of safety related signals up to SIL 3 / PL e.

Typical fields of application:

  • Galvanically isolated coupling of digital 24V and 230V signals
  • Safe coupling of sensor signals, e.g. pressure switch to control unit
  • Contact multiplication with limited output power of the used contoller
  • Filtering of test pulses sent by the safety controller

The safe coupling relays SK3D and SD1K are especially designed for this application and enable the coupling of safety-related signals up to SIL 3 / PL e applications with a minimum width of 6.8 mm or 22.5 mm.

Aside from the use according to IEC61508 and IEC 61511, the recognised standards for furnaces were also taken into account. Both relays are type approved for the use in furnaces in continous operation according to EN 50156-1 and EN 746-2.

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