The Siemens 3SK12111BB40 is a SIRIUS safety relay output expansion module designed to extend the output capability of compatible Siemens SIRIUS safety relay systems. It provides 4 relay enabling circuits with 4 NO contacts along with 1 NC relay signaling circuit, making it suitable for machine safety and industrial automation applications where additional relay outputs are required.
With a 24 V DC supply and screw-terminal connection, this output expansion module is designed for integration into suitable industrial control and safety architectures. It can help OEM machine builders, panel manufacturers and system integrators expand relay output functions while maintaining a modular safety-control arrangement.
Important: The 3SK12111BB40 is a component of a complete safety-related control system. Its suitability for a particular safety function depends on the complete system architecture, wiring, connected devices, risk assessment and applicable safety requirements.
The Siemens 3SK12111BB40 safety relay output expansion module is used when a compatible safety relay system requires additional relay switching outputs.
The module provides four relay enabling circuits with 4 normally open (NO) contacts. These contacts can be incorporated into appropriate external control circuits according to the machine's safety architecture.
It also includes one normally closed (NC) relay signaling contact, which can be used for suitable status or diagnostic signaling functions.
This makes the module useful in industrial machinery where a safety-related control function needs to interface with multiple external circuits.
The primary output function of the 3SK12111BB40 is provided by its four relay enabling circuits with 4 normally open contacts.
These outputs provide additional switching paths that can be incorporated into compatible external circuits.
Depending on the complete machine design, the relay outputs may be used for functions associated with:
The exact purpose and safety classification of each output must be established as part of the complete machine safety design.
In addition to the four NO relay enabling contacts, the Siemens 3SK12111BB40 includes one NC relay signaling circuit.
The signaling contact can be used to communicate the operating or switching state of the module to an appropriate control or indication circuit.
Possible uses can include:
The signaling contact should only be used for a safety-related function when the complete architecture has been appropriately designed and validated for that purpose.
The 3SK12111BB40 is designed for a 24 V DC supply, a widely used control voltage in industrial automation and machine-control systems.
Using 24 V DC can make the module suitable for control panels where other automation components, sensors, PLCs and control devices are also supplied from a 24 V DC control circuit.
The supply and wiring should be installed according to the applicable Siemens documentation and the requirements of the complete control system.
The module features screw-terminal connections, providing a conventional wiring solution for industrial control cabinets.
Screw terminals allow individual conductors to be connected directly and can simplify installation and maintenance.
Panel builders should use suitable conductors and follow the specified wiring, terminal tightening and installation requirements for reliable operation.
The 3SK12111BB40 belongs to the Siemens SIRIUS 3SK safety system and is intended as an output expansion component for compatible safety relay configurations.
A modular safety-control system can allow machine builders to expand the number of available output circuits according to the requirements of the application.
The 4RO configuration provides four relay enabling outputs, while the additional NC signaling circuit provides a separate status-related switching path.
Compatibility with the existing safety relay and system architecture should be verified before installation.
The Siemens 3SK12111BB40 safety relay output expansion module can be considered for appropriately designed applications including:
For OEMs and machine manufacturers, the 3SK12111BB40 can provide additional relay output capability without requiring a completely different safety-control arrangement.
Its four NO enabling contacts allow multiple external circuits to be controlled from a compatible safety architecture, while the NC signaling contact can provide an additional status or monitoring path.
This modular approach can be useful when machine designs require different numbers of output circuits across various equipment configurations.
Panel builders can integrate the 3SK12111BB40 into suitable SIRIUS safety relay systems where additional relay outputs are needed.
The 24 V DC supply is particularly convenient for industrial control panels that use 24 V DC as the standard control voltage.
The screw-terminal connection also provides a familiar wiring arrangement for control-panel assembly and maintenance.
The 3SK12111BB40 should not be treated as a standalone safety system. Its safety performance depends on the complete safety-related control architecture.
Before commissioning a machine, the system should be appropriately assessed and validated, considering:
The module should be selected and installed according to the relevant Siemens documentation and applicable machinery safety requirements.
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The Siemens 3SK12111BB40 is a SIRIUS safety relay output expansion module with 4 relay enabling circuits and an additional relay signaling circuit.
It provides 4 NO relay enabling contacts.
Yes. It has 1 NC relay signaling contact.
The module uses a 24 V DC supply.
It uses screw-terminal connections.
4RO refers to the output expansion configuration providing four relay outputs/enabling circuits.
It can be integrated into compatible machine safety systems, industrial machinery, production lines, automation equipment and safety-control panels.
No. It is an output expansion component and must be incorporated into a properly designed and validated safety-related control system.
| 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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