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Safety coupling relays for process technology

08 December 2009

The PSR-FSP safety relay from Phoenix Contact is a safe coupling relay that is specifically harmonised to operate with fail-safe controls (F-PLC) in process technology. Here, all of the requirements for use in applications up to SIL 3 according to IEC 61508 are fulfilled. The coupling relay has a positively driven safety relay whose contacts have an optimised opening behavior when faults occur.

The specific requirements of a fail-safe control are taken into account using the integrated test pulse filter to extend the lifetime as well as a control circuit to adapt the current drawn.
The safe coupling relay is just 17.5 mm wide and offers users an NO and a signaling contact that can be externally connected.

The maximum switched current of the NO contact is 5 A. A 5 x 20 mm standard fuse, externally accessible, is also integrated in the device to protect the load contact. The wiring is simplified using pluggable and coded screw or spring cage terminals.