Pilz PNOZ s3 750103 | Safety Relay 24V DC, 2 NO + 1 NC Aux, DIN Rail, EN ISO 13849-1 PL e, SIL CL 3
Pilz PNOZ s3 (Art. No. 750103) configurable safety relay — 24 V DC supply, 2 NO safety contacts + 1 NC auxiliary, manual/auto reset, EN ISO 13849-1 PL e, SIL CL 3. For E-STOP, guard monitoring, light curtain.
Product Overview
The Pilz PNOZ s3 (Article No. 750103) is a compact configurable safety relay from the PNOZ sigma (PNOZ s) series, designed for monitoring emergency stop (E-STOP) pushbuttons, safety gates, light curtains, and two-hand controls. It operates from a 24 V DC supply (20.4–26.4 V DC) and provides 2 positively driven safety output contacts (NO — make on safe state) plus 1 auxiliary NC contact (signaling). The unit supports manual reset (default) or automatic reset (selectable via DIP switch) and includes semiconductor short-circuit detection (EDM — External Device Monitoring). It achieves EN ISO 13849-1 Category 4 / PL e and IEC 62061 SIL CL 3 / IEC 61508 SIL 3. Width is 22.5 mm — mounts on a standard 35 mm DIN rail.
Technical Specifications (Electrical & Safety)
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Parameter
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Specification
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Article / Order No.
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750103 — PNOZ s3 C 24VDC 2n/o
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Series
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Pilz PNOZ sigma (PNOZ s) — Compact Safety Relays
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Supply Voltage (Us)
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24 V DC (Range 20.4 … 26.4 V DC, reverse-polarity protected)
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Current Consumption (typ.)
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≈ 60 mA @ 24 V DC (no load, relays de-energized)
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Safety Inputs
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1 × dual-channel (A1/A2 start; S11/S12+S21/S22 safety loop) — accepts N/C contact inputs
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Safety Outputs (Positively Driven)
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2 × NO (make contacts) — rated 6 A @ 230 V AC / 24 V DC (resistive)
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Auxiliary Output
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1 × NC (break contact) — for diagnostic signaling, 6 A max.
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Reset Type
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Manual Reset (default) / Automatic Reset — selectable via DIP switch
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EDM (External Device Monitoring)
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Yes — configurable via DIP switch
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Start-Up / Response Time
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≤ 30 ms (safety circuit closed → outputs pick up)
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Performance Level (EN ISO 13849-1)
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Category 4 / PL e
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SIL Rating (IEC 62061 / IEC 61508)
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SIL CL 3 / SIL 3
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Technical Specifications (Mechanical & Environmental)
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Parameter
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Specification
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Width (per DIN module)
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22.5 mm (compact sigma format)
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Height / Depth
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98 mm / 114 mm (behind DIN rail)
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Mounting
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35 mm DIN Rail (EN 60715 / TS 35) — snap-on with release latch
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Terminals
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Cage-clamp spring terminals — solid 0.2–2.5 mm² / stranded 0.2–1.5 mm²
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Degree of Protection
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IP20 (finger-safe when installed in enclosure)
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Operating Temperature
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-10 … +55 °C
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Storage Temperature
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-25 … +85 °C
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Humidity
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5–95 % RH, non-condensing
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Weight (Approx.)
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0.16 kg
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Certifications
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CE, cULus (NRTL), TÜV, CCC, EAC, KOSHA
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Conformance Standards
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EN ISO 13849-1, IEC 61508, IEC 62061, EN 60204-1
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Key Features
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PL e / SIL 3 Certified: Suitable for highest-demand safety functions — E-STOP, guard interlocking, muting, light curtain with OSSD.
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Dual-Channel Input with Cross-Fault Detection: Monitors for short between input channels and wiring faults — forces unsafe state if detected.
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Manual / Auto Reset + EDM: Flexibly matches machine start-up philosophy; EDM verifies correct functioning of downstream contactors.
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Compact 22.5 mm Width: Saves DIN rail space vs. classic PNOZ 1/2 series (45 mm).
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LED Diagnostics: Power (green), Safe State / Channel 1&2 (green), Fault (red) — quick troubleshooting.
Typical Applications
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Emergency Stop Circuits: Monitoring E-STOP pushbuttons per EN ISO 13850 — ensures controlled machine stop.
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Safety Gate / Interlock Monitoring: With positively guided door switches (e.g. PSENmag / PSENmech) — prevents access until hazard cleared.
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Light Curtain / Laser Scanner Interface: Evaluating OSSD outputs from type 2/4 optoelectronic ESPE via external test pulse evaluation.
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Two-Hand Control (Type III A/C): When used with appropriate input wiring and validation — see Pilz application note for Type III C with PNOZ s3 + PITgate.
PNOZ s3 variants: 750103 = 24V DC, 2 n/o + 1 NC aux (this item). Other common versions: 750104 = 24V DC 3 n/o, 750110 = 115V AC/DC 2 n/o, 750111 = 230V AC/DC 2 n/o. For configurable PNOZ s5/s6/s7 (more inputs/outputs, time delay, logic) see the PNOZ sigma modular range. PNOZ s3 is the direct successor to the classic PNOZ 1 (751001 etc.) in narrower 22.5 mm housing.
