Schmersal – SRB 324ST/R‑24 V (V.3) – PROTECT Series 24 V AC/DC Safety‑Monitoring

Main Features

• Series: PROTECT SRB family, Device version SRB 324ST/R‑24 V, revision 3  

• Safety Contacts:

  • 3 safety contacts for “STOP 0” circuit

  • 2 safety contacts for “STOP 1” circuit (adjustable delay 1–30 s)  

• Signal Outputs: 4 auxiliary signaling outputs for diagnostics/status  

• Safety Ratings:

  • SIL 3 & PL e (STOP 0), SIL 2 & PL d (STOP 1), Cat. 4 (enabling path)  

  • Diagnostic coverage ≥ 99% / > 60%; PFHd ≈ 2×10⁻⁸/h  

• Reset Modes:

  • Automatic reset or manual reset with edge detection; includes short-circuit detection  

• Power Supply: 24 V AC/DC (−15 %/+10 %)  

• Mechanical Data:

  • DIN-rail mounting (EN 60715), width 45 mm, depth 121 mm, height 100 mm; weight ≈480 g  

• Environment & Safety Approvals:

  • Ambient temperature −25 °C to +60 °C; IP40 enclosure (terminals IP20); EN IEC 62061, IEC 61508, ISO 13849-1 compliant  

• Protection Features:

  • Electronic fuse, wire‑break & cross‑circuit detection, earth-fault detection, system diagnostics present