The Siemens 3SK11212AB40 is a SIRIUS safety relay basic unit from the Advanced series, designed for safety-related control applications in industrial machinery and automation systems. It provides 3 NO relay enabling contacts along with 1 NC relay signaling contact, offering a compact solution for controlling safety-related circuits and providing additional status feedback.
The unit operates with a 24 V DC supply and features spring-type push-in terminals, making it suitable for modern industrial control panels where efficient and reliable wiring is required.
The 3SK11212AB40 safety relay is designed to process suitable safety-related input signals and control connected output circuits within an appropriately designed machine safety system.
Its 3 NO relay enabling contacts provide switching paths for external circuits, while the 1 NC relay signaling contact can be used for status or diagnostic signaling.
This configuration makes the device suitable for machinery where a safety relay needs to control multiple external circuits from a single safety-control unit.
Typical applications can include machine shutdown circuits, emergency-stop systems, protective-device monitoring and other safety-related machine-control functions.
The 3SK11212AB40 provides three normally open relay enabling contacts.
These relay contacts can be incorporated into suitable external circuits according to the machine's safety architecture.
Depending on the system design, the enabling outputs can interface with devices such as:
The actual safety function and permissible use of each output must be established as part of the complete machine safety design.
In addition to the three NO enabling contacts, the unit provides one normally closed (NC) relay signaling contact.
The signaling contact can be used to provide additional status information to a control or monitoring circuit.
Possible applications include:
The signaling contact should not automatically be considered a safety output. Its safety role, if any, depends on the complete system architecture and validation.
The Siemens 3SK11212AB40 is designed for a 24 V DC supply, a widely used control voltage in industrial automation systems.
This allows it to integrate conveniently into control panels where 24 V DC is already used for PLCs, sensors, safety devices and other control components.
The power supply and wiring should be installed according to the relevant Siemens documentation and the requirements of the complete safety system.
The device uses spring-type terminals with push-in technology.
This connection method can simplify installation in industrial control panels and reduce wiring effort compared with traditional screw-terminal arrangements.
Push-in terminals can also make maintenance and component replacement more convenient when compatible wiring practices are followed.
Panel builders should use the appropriate conductor types and follow the specified installation procedures.
The 3SK11212AB40 belongs to the Siemens SIRIUS 3SK safety relay family and is part of the Advanced series.
The Advanced series provides safety-control functionality for machinery where a dedicated safety relay is required to monitor appropriate safety inputs and control corresponding outputs.
The modular SIRIUS safety concept allows suitable safety components to be combined according to the requirements of different machine architectures.
Before installation, compatibility with the selected input devices, output circuits and overall safety architecture should be confirmed.
The Siemens 3SK11212AB40 safety relay can be considered for appropriately designed applications including:
For OEM machine builders, the 3SK11212AB40 provides a compact way to implement a suitable relay-based safety-control function.
The three NO enabling contacts can provide multiple switching paths, while the additional NC signaling contact can support status monitoring.
Its 24 V DC supply fits well into common machine-control architectures, and the push-in terminals can simplify panel assembly.
The 3SK11212AB40 is suitable for control-panel designs where efficient wiring and compact safety components are required.
Its push-in terminal technology can help panel builders streamline wiring, while the relay contact configuration provides multiple output paths for connected control circuits.
The module can be incorporated alongside suitable Siemens SIRIUS components and other compatible safety devices.
The 3SK11212AB40 should be used as part of a complete safety-related control system, not as an isolated safety solution.
The final safety performance depends on the complete system, including:
The complete safety function should be appropriately designed, verified and validated before commissioning.
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The 3SK11212AB40 is a Siemens SIRIUS Advanced series safety relay basic unit with 3 NO relay enabling contacts and 1 NC relay signaling contact.
It has 3 NO relay enabling contacts.
Yes. It provides 1 NC relay signaling contact.
The unit operates with a 24 V DC supply.
It uses spring-type push-in terminals.
It belongs to the Siemens SIRIUS Advanced safety relay series.
It can be integrated into appropriately designed industrial machinery, production lines, machine safety systems, automation equipment and safety-control panels.
No. It is a safety relay basic unit and must be incorporated into a properly designed and validated safety-related control system.
| Parameter | Specification |
|---|---|
| Product Series | Siemens SIRIUS 3SK1 Advanced |
| Model Number | 3SK1121-2AB40 |
| Variant | AB40 |
| Supply Voltage | 24V DC |
| Output Contacts | 3 NO safety outputs + 1 NC auxiliary output |
| Mounting Type | DIN rail |
| Width | 22.5 mm |
| Terminal Type | Spring / push-in terminals |
| Input Configuration | 1-channel / 2-channel safety devices |
| Safety Functions | E-stop, safety gate, light curtain monitoring |
| Protection Class | IP20 |
| Operating Temperature | -25°C to +60°C |
| Mechanical Life | ~10 million operations |
| Electrical Life | ~10 million cycles |
| Shock Resistance | 10 g / 11 ms |
| Vibration Resistance | Up to 0.75 mm (IEC 60068-2-6) |
| Compliance | IEC 61508, ISO 13849-1 |
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