The Siemens 3SK1111-1AW20 is a SIRIUS 3SK1 safety relay basic unit designed for machine safety applications such as emergency stop circuits, safety gate monitoring, and safety interlocking systems. It ensures that machines shut down safely when a hazardous condition is detected.
This device is widely used in industrial automation and machine safety systems to meet functional safety standards like PL e (Category 4) and SIL 3 depending on the circuit design.
• Siemens SIRIUS 3SK1 series safety relay
• Part Number: 3SK1111-1AW20
• Supply voltage: 110–240V AC/DC
• 3 safety enabling outputs (NO contacts)
• 1 auxiliary signaling output (NC contact)
• Suitable for emergency stop and safety gate monitoring
• Two-channel input monitoring with cross-fault detection
• DIN rail mounting design (22.5 mm compact width)
• Screw terminal connection
• Category 4 / PL e capable safety system design
• LED status indication for diagnostics
• High reliability for machine safety applications
• Conforms to IEC 61508 / ISO 13849-1 / IEC 62061 safety standards
| Parameter | Specification |
|---|---|
| Product Series | Siemens SIRIUS 3SK1 |
| Part Number | 3SK1111-1AW20 |
| Product Type | Safety Relay (Basic Unit) |
| Supply Voltage | 110–240V AC/DC |
| Safety Outputs | 3 × NO (safety contacts) |
| Auxiliary Output | 1 × NC |
| Function | Emergency stop / safety gate monitoring |
| Mounting Type | DIN rail |
| Width | 22.5 mm |
| Input Type | Dual-channel safety inputs |
| Standards | ISO 13849-1, IEC 61508, IEC 60204-1 |
| Safety Level | Up to PL e / SIL 3 (system dependent) |
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