Siemens 3SK1111-1AB30 SIRIUS 3SK1 Standard Safety Relay Basic Unit

Siemens SIRIUS 3SK1111-1AB30 is a standard safety relay basic unit for safety-related circuits. It features three NO relay enabling circuits (safety contacts) and one NC signaling contact. The unit monitors safety devices such as emergency stops, protective doors, light barriers, and laser scanners. Used for safe shutdown in hazardous conditions. No programming required; configuration via front selector switches. Positively driven relays with self‑check every ON/OFF cycle.

Applications:

• EMERGENCY OFF and EMERGENCY STOP monitoring (EN 60204-1)

• Protective door monitoring with electromechanical switches or safety door switches

• Light barrier, light array, and laser scanner monitoring

• Single‑channel or two‑channel safety circuits with cross‑circuit detection

• Autonomous safety applications (standalone or expandable)

Technical Specifications:

• Product type: SIRIUS safety relay basic unit (Standard series)

• Supply voltage: 24 V AC/DC

• Relay enabling circuits: 3 normally open (NO) contacts (positive‑guided)

• Signaling circuit: 1 normally closed (NC) contact (non‑safety related)

• Contact rating (NO): 5 A at 115/230 V AC, 5 A at 24 V DC (AC‑15/DC‑13)

• Starting/input: 2 sensor inputs (Ch1/Ch2), 1 feedback circuit/start button input

• Reset type: Monitored and autostart modes selectable via slide switch

• Cross‑circuit detection: Between sensor channels 1 and 2

• Safety integrity: SIL3 (IEC 61508 / IEC 62061), PL e (EN ISO 13849‑1), Category 4

• PFHD: 1.7 × 10⁻⁹ /h, PFDavg: 1 × 10⁻⁶, service life T1: 20 years

• Operating temperature: –25 °C to +60 °C

• Operating humidity: 10% to 95% (non‑condensing)

• Shock resistance: 10 g / 11 ms, vibration: 5–500 Hz / 0.75 mm

• Enclosure protection: IP20

• Dimensions (HxWxD): 100 mm x 22.5 mm x 121.6 mm (approx.)

• Weight: Approx. 0.15–0.26 kg

• Mounting: Snap‑on DIN rail (35 mm)

• Connection method: Screw terminals (removable)

• Certifications: CE, cULus, CCC, EAC, ATEX, IECEx, TÜV, RoHS compliant

Compatibility:

• SIRIUS 3SK1 safety relay system architecture

• Compatible with 3RM1 motor starters via 3ZY1212 connection adapter

• Mechanical and electronic safety sensors

Related Products:

• 3SK1112-1AB30 – Standard basic unit with solid‑state outputs (2 safe outputs + 1 signaling)

• 3SK1211-1BB00 – Advanced series basic unit, 24V DC, spring terminal

• 3RK1105-1AE04 – MSS expansion module for modular safety system

Product Status:
Active product. Successor for discontinued 3TK safety relay series. Requires external start/feedback circuit wiring.

PLC ERA is an independent industrial automation distributor. Products are sourced through established supply channels and inspected prior to shipment. International shipping available.