Variant CB42 | Advanced Safety Relay Basic Unit, 24V DC, Time-Delayed Outputs
The Siemens 3SK1121-2CB42 is an advanced safety relay basic unit from the SIRIUS 3SK1 Series, designed for complex machine safety applications where both instantaneous and time-delayed safety outputs are required. It is used in systems like emergency stop circuits, safety gates, and automated machinery requiring controlled safe stop sequences.
This model is part of Siemens’ Advanced 3SK112 platform, offering flexible configuration, diagnostics, and expandable safety architecture for industrial automation systems.
| Parameter | Specification |
|---|---|
| Product Series | Siemens SIRIUS 3SK1 Advanced |
| Model Number | 3SK1121-2CB42 |
| Variant | CB42 |
| Supply Voltage | 24 V DC |
| Output Contacts | 2 NO instantaneous + 2 NO delayed |
| Time Delay Range | ~0.5 to 30 seconds (series dependent) |
| Mounting Type | DIN rail |
| Width | 22.5 mm |
| Terminal Type | Push-in / spring terminals |
| Safety Inputs | 1-channel / 2-channel configurable |
| Feedback Monitoring | Yes (EDM) |
| Cross-circuit Detection | Yes |
| Protection Class | IP20 |
| Operating Temperature | -25°C to +60°C |
| Standards | IEC 61508, ISO 13849-1 |
| Safety Level | SIL 3 / PL e capable system design |
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