The Siemens 3SK1122-2CB41 is a SIRIUS 3SK1 Advanced safety relay basic unit designed for machine safety applications with time-delay functionality and solid-state outputs. It is used in emergency stop circuits, safety gate monitoring, and controlled shutdown systems (STOP Category 1) where a safe delayed stop is required.
This relay is part of Siemens’ modular 3SK1 safety system, which allows flexible expansion and parameterization for industrial safety circuits.
• Siemens SIRIUS 3SK1 Advanced series safety relay
• Part Number: 3SK1122-2CB41
• Supply voltage: 24V DC
• Time delay range: approx. 0.05 – 3 seconds
• Solid-state safety outputs (no mechanical relay contacts)
• 2 instantaneous safety outputs
• 2 time-delayed safety outputs
• Dual-channel input monitoring
• Cross-circuit detection & diagnostic monitoring
• DIN rail mounting (22.5 mm compact design)
• Screw / cage clamp terminals
• LED status & fault indication
• Suitable for Category 4 / PL e safety systems (system dependent)
• Designed for emergency stop and protective device circuits
| Parameter | Specification |
|---|---|
| Product Series | Siemens SIRIUS 3SK1 |
| Part Number | 3SK1122-2CB41 |
| Product Type | Safety Relay (Advanced, Solid-State Outputs) |
| Supply Voltage | 24V DC |
| Time Delay | 0.05 – 3 s |
| Output Type | Solid-state safety outputs |
| Safety Outputs | 2 instantaneous + 2 delayed |
| Input Type | Dual-channel safety inputs |
| Mounting Type | DIN rail |
| Width | 22.5 mm |
| Function | E-stop / safety gate / controlled stop |
| Standards | ISO 13849-1, IEC 61508, IEC 60204-1 |
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