Variant BW20 | Modular Output Expansion Unit, 4 NO + 1 NC Outputs, 110–240V AC/DC
The Siemens 3SK1211-1BW20 is a modular safety relay output expansion unit from the SIRIUS 3SK1 Series, designed to increase the number of safety switching outputs in a machine safety system. It is used together with a 3SK1 safety basic unit, allowing safe control of multiple contactors, drives, or safety loads from a single safety controller.
This module is widely used in industrial automation panels, machine safety systems, and large production lines where more safe outputs are required than the base relay provides.
| Parameter | Specification |
|---|---|
| Product Series | Siemens SIRIUS 3SK1 |
| Model Number | 3SK1211-1BW20 |
| Variant | BW20 |
| Product Type | Output Expansion Module |
| Supply Voltage | 110–240V AC/DC |
| Output Contacts | 4 NO + 1 NC |
| Function | Safety output expansion |
| Mounting Type | DIN rail |
| Width | 22.5 mm |
| Height | ~100 mm |
| Depth | ~121.6 mm |
| Terminal Type | Screw terminals |
| Operating Temperature | -25°C to +60°C |
| Protection Class | IP20 |
| Switching Capacity | Up to ~5–10 A (AC-15 dependent) |
| Standards | IEC 61508, ISO 13849-1 compliant system use |
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