The Siemens 3SK1211-2BB40 is a SIRIUS 3SK1 series output expansion module used with Siemens safety relay systems. It is designed to increase the number of safety outputs in a machine safety circuit when the main safety relay does not have enough contacts.
This module is not a standalone safety relay, it works only as an extension unit for 3SK1 safety controllers.
• Siemens SIRIUS 3SK1 series expansion module
• Part Number: 3SK1211-2BB40
• Type: Output expansion (4RO module)
• Supply voltage: 24V DC
• 4 safety relay outputs (NO contacts)
• 1 auxiliary signaling contact (NC)
• Used for extending safety relay output capacity
• DIN rail mounting (22.5 mm compact design)
• Push-in / spring terminal connection
• LED status indication
• Suitable for high safety integrity systems (up to PL e / Cat. 4 depending on system design)
• Designed for SIRIUS 3SK1 modular safety architecture
| Parameter | Specification |
|---|---|
| Product Series | Siemens SIRIUS 3SK1 |
| Part Number | 3SK1211-2BB40 |
| Product Type | Output Expansion Module |
| Supply Voltage | 24V DC |
| Safety Outputs | 4 × NO (relay outputs) |
| Auxiliary Output | 1 × NC |
| Function | Output expansion for safety relay |
| Mounting Type | DIN rail |
| Width | 22.5 mm |
| Application | Machine safety systems |
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