Safety relays
ReLy / Evaluation unit

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    • Features
      ApplicationsEvaluation unit
      Compatible sensor types

      Safety sensors with OSSDs

      Safety sensors with test input

      Safety sensors with potential-free outputs

      Safety pressure mats

    • Safety-related parameters
      Safety integrity level

      SIL3 (IEC 61508)

      SILCL3 (IEC 62061)

      CategoryCategory 4 (ISO 13849-1)
      Performance levelPL e (ISO 13849-1)
      PFHD (mean probability of a dangerous failure per hour)1.5 × 10-9
      TM (mission time)20 years (ISO 13849-1)
      Stop category0 (IEC 60204-1)
    • Functions
      Sensor monitoring

      Discrepancy monitoring

      Sequence monitoring

      Cross-circuit detection

      Restart interlock



      External device monitoring (EDM)
    • Interfaces
      Connection typeFront connector with spring terminals

      2 safety inputs

      1 input for reset pushbutton or external device monitoring (EDM)


      3 enabling current paths (safe)

      2 application diagnostic outputs (not safe)

      2 test pulse outputs (not safe)

      Display elementsLEDs
      Configuration method

      Hard wired

      DIP switch

    • Electrical data - Operating data
      Voltage supplyPELV or SELV
      Supply voltage VS24 V DC (16.8 V ... 30 V)
      Residual ripple≤ 2.4 V
      Power consumption≤ 2.5 W (DC)
    • Electrical data - Safety inputs
      Input voltage
      HIGH24 V DC (11 V ... 30 V)
      LOW0 V DC (–3 V ... 5 V)
      Input current4 mA ... 6 mA
      Test pulse width≤ 1 ms
      Test pulse rate≤ 10 Hz
      Activation time tolerance between the two start buttons≤ 3 s
    • Electrical data - Reset pushbutton or external device monitoring (EDM) input
      Input voltage
      HIGH24 V DC (11 V ... 30 V)
      LOW0 V DC (–3 V ... 5 V)
      Input current4 mA ... 6 mA
    • Electrical data - Enabling current paths
      Response timeDepends on the configured sensor type, for details see operating instructions
      Type of outputN/O contacts, positively guided
      Contact materialSilver alloy, gold flashed
      Switching voltage

      10 V AC ... 230 V AC

      10 V DC ... 230 V DC

      Switching current10 mA ... 6 A
      Total current12 A
      Mechanical life1 x 107 switching cycles
      Overvoltage categoryIII (EN 60664-1)
      Rated impulse withstand voltage Uimp6 kV (EN 60664-1)
    • Electrical data - Application diagnostic outputs
      Type of outputPush-pull semiconductor output, short-circuit protected
      Output voltage
      HIGH≥ Vs – 3 V
      LOW≤ 3 V
      Input current (NPN)≤ 15 mA
      Output current (PNP)≤ 120 mA
    • Electrical data - Test pulse outputs
      Type of outputPNP semiconductors, short-circuit protected
      Output voltage≥ Vs – 3 V
      Test pulse widthDepends on the configured sensor type 1)
      Test pulse intervalDepends on the configured sensor type, for details see operating instructions
      • 1) For details see operating instructions.
    • Mechanical data
      Dimensions (W x H x D)18 mm x 124.6 mm x 85.5 mm
      Weight160 g
    • Ambient data
      Enclosure ratingIP20 (IEC 60529)
      Ambient operating temperature–25 °C ... +55 °C
      Storage temperature–25 °C ... +70 °C
      Air humidity≤ 95 %, Non-condensing
      Interference emissionAccording to IEC 61000-6-4
      Interference resistance

      According to IEC 61326-3-1

      According to IEC 61000-6-2

      According to IEC 60947-5-1

    • Classifications
      eCl@ss 5.027371990
      eCl@ss 5.1.427371990
      eCl@ss 6.027371819
      eCl@ss 6.227371819
      eCl@ss 7.027371819
      eCl@ss 8.027371819
      eCl@ss 8.127371819
      eCl@ss 9.027371819
      eCl@ss 10.027371819
      eCl@ss 11.027371819
      eCl@ss 12.027371819
      ETIM 5.0EC001449
      ETIM 6.0EC001449
      ETIM 7.0EC001449
      ETIM 8.0EC001449
      UNSPSC 16.090141113704

    Technical drawings

    Dimensional drawing EMSS3, LOOP1, MULT1, OSSD3
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