Variant BB40 | Modular Output Expansion Unit, 4 NO + 1 NC Outputs, 24V DC
The Siemens 3SK1211-1BB40 is a modular output expansion unit from the SIRIUS 3SK1 Safety Series, designed to increase the number of safe switching outputs in a safety control system. It is not a standalone safety controller; instead, it works together with a 3SK1 safety relay basic unit, extending its output capacity for controlling more contactors or safety loads.
This module is commonly used in machine safety systems, automation panels, and industrial control cabinets where additional safety outputs are required.
| Parameter | Specification |
|---|---|
| Product Series | Siemens SIRIUS 3SK1 |
| Model Number | 3SK1211-1BB40 |
| Variant | BB40 |
| Product Type | Output Expansion Module |
| Supply Voltage | 24V DC |
| Output Contacts | 4 NO + 1 NC |
| Function | Safety relay output expansion |
| Mounting Type | DIN rail |
| Connection Type | Screw terminals |
| Operating Temperature | -25°C to +60°C |
| Protection Class | IP20 |
| Switching Type | Electromechanical relay outputs |
| Compatibility | Works with 3SK1 basic/advanced safety relays |
| Mechanical Life | Up to ~10 million operations (system dependent) |
| Electrical Life | ~1 million cycles (load dependent) |
| Standards | IEC 61508, ISO 13849-1 compliant system use |
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