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High ease of use, more space in the control cabinet, quicker production starts, more compact machines with shorter safety distances and reduced downtime: With the clever ReLy safety relay, you get even more out of your application, and that with high safety at performance level e. So don’t rely on just any safety relay – use the ReLy from SICK. Thanks to clearly defined areas of application, selecting the right variant is simple as can be.


  • Clever, user-friendly housing functions
  • Thin design with construction widths from 18 mm
  • Fast response times of under 10 ms (depending on the type)
  • Status LEDs and diagnostic interfaces
  • Variants for universal application and for safe series connection with Flexi Loop available


Applications Evaluation unit / output expansion module for OSSDs /
evaluation unit for stop category 1 applications
Safety integrity level SIL3 (IEC 61508)
SILCL3 (IEC 62061)
Category Category 4 (ISO 13849-1)
Performance level PL e (ISO 13849-1)
Sensor monitoring Discrepancy monitoring
Cross-circuit detection
Sequence monitoring
Typical response time 10 ms
12 ms
79 ms
Configuration method Hard wired / hard wired / DIP switch
Housing width 18 mm / 28 mm

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