Siemens 3SK11111AB30 SIRIUS Safety Relay – Standard Series, 3 NO + 1 NC, 24 V AC/DC

The Siemens 3SK11111AB30 is a SIRIUS safety relay basic unit from the Standard series, designed for safety-related control applications in industrial machinery, automation systems, and electrical control panels. It provides 3 NO relay enabling contacts together with 1 NC relay signaling contact, allowing multiple external circuits to be controlled within an appropriately designed machine safety architecture.

The unit operates with a 24 V AC/DC supply and uses screw-terminal connections, providing a conventional and practical wiring solution for industrial control cabinets. Its relay-based output configuration makes it suitable for OEM machinery, panel builders, system integrators, and industrial automation applications.

What Is Siemens 3SK11111AB30 Used For?

The Siemens 3SK11111AB30 safety relay is designed to monitor suitable safety-related input signals and control connected output circuits as part of a complete machine safety system.

The 3 NO relay enabling contacts provide multiple switching paths for external circuits, while the 1 NC relay signaling contact can be used for appropriate status, diagnostic, or auxiliary signaling functions.

The device can be incorporated into machine safety functions involving suitable emergency-stop devices, protective guards, safety switches, and other compatible safety inputs.

The exact safety function depends on the complete system architecture, wiring, connected components, risk assessment, and applicable safety requirements.

Key Features & Benefits

• Siemens SIRIUS safety relay
• Standard series basic unit
• Model 3SK11111AB30
• 3 NO relay enabling contacts
• 1 NC relay signaling contact
• 24 V AC/DC supply
• Screw-terminal connection
• Suitable for machine safety applications
• Suitable for industrial automation
• Suitable for electrical control panels
• Suitable for OEM machinery
• Relay-based safety-control solution
• Suitable for multiple enabling circuits
• Additional signaling contact for status or monitoring
• Suitable for industrial machine-control systems

3 NO Relay Enabling Circuits

The 3SK11111AB30 provides three normally open relay enabling contacts.

These contacts can be incorporated into suitable external circuits according to the machine's safety-control design.

Depending on the application, the outputs may be used for:

• Contactor control
• Machine shutdown
• Motor-control circuits
• Actuator control
• External enabling circuits
• Machine-control functions
• Safety-related switching circuits

The actual purpose and safety classification of each output must be determined by the complete safety architecture.

1 NC Relay Signaling Circuit

In addition to the three NO enabling contacts, the Siemens 3SK11111AB30 includes one normally closed relay signaling contact.

This contact can provide an additional switching path for status and diagnostic purposes.

Potential uses include:

• Control-panel status indication
• PLC monitoring
• Diagnostic feedback
• Auxiliary signaling
• Safety-system status indication

The signaling contact should not automatically be treated as a safety output. Its role within a safety function depends on the complete system design and validation.

24 V AC/DC Supply

The 3SK11111AB30 is designed for a 24 V AC/DC supply, providing flexibility for industrial control systems using either AC or DC control voltage.

This can be useful in control panels where 24 V AC or 24 V DC is already used for other control components.

The supply connection should be made according to the applicable Siemens documentation and the requirements of the complete electrical system.

Screw-Terminal Connection

The device features screw-terminal connections, providing a conventional wiring method for industrial control panels.

Screw terminals allow individual conductors to be connected directly and can be convenient for installation, maintenance, and replacement work.

Panel builders should follow the specified conductor, terminal, and wiring requirements to ensure correct installation.

SIRIUS Standard Safety Relay

The 3SK11111AB30 belongs to the Siemens SIRIUS Standard safety relay series.

The SIRIUS safety relay family is intended for safety-related control applications in machinery and industrial automation. The Standard series provides relay-based safety-control functionality for suitable safety input and output configurations.

The unit can be integrated with compatible safety devices and external switching components to implement an appropriate machine safety architecture.

Compatibility with the intended safety inputs, output devices, and system configuration should be verified before installation.

Typical Applications

The Siemens 3SK11111AB30 safety relay can be considered for appropriately designed applications including:

• Industrial machinery
• Machine safety control panels
• Production lines
• Manufacturing equipment
• Packaging machinery
• Conveyor systems
• Material-handling equipment
• Machine tools
• Industrial automation systems
• OEM machinery
• Electrical control cabinets
• Emergency-stop circuits
• Protective-device monitoring

Benefits for OEM Machine Builders

For OEM machine manufacturers, the 3SK11111AB30 provides a practical relay-based solution for implementing suitable machine safety functions.

The three NO enabling contacts provide multiple output paths, while the NC signaling contact can support status or diagnostic monitoring.

Its 24 V AC/DC supply provides flexibility for different machine-control architectures, while the screw-terminal design offers a familiar wiring solution.

Benefits for Panel Builders

For control-panel manufacturers, the 3SK11111AB30 can be incorporated into safety-control panels alongside compatible Siemens safety components, contactors, emergency-stop devices, and other industrial control products.

The screw-terminal connection provides a straightforward wiring arrangement for panel assembly and maintenance.

Its compact relay output configuration can help organize multiple safety-related control circuits within a suitable panel design.

Safety Considerations

The 3SK11111AB30 should be used as part of a complete safety-related control system.

Its overall safety performance depends on the complete architecture, including:

• Safety input devices
• Safety logic
• Relay outputs
• Contactors
• Feedback circuits
• Emergency-stop devices
• Protective devices
• Wiring
• Restart behavior
• Machine risk assessment

The complete safety function should be appropriately designed, verified, and validated before commissioning.

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Frequently Asked Questions

Q1. What is Siemens 3SK11111AB30?

The 3SK11111AB30 is a Siemens SIRIUS Standard series safety relay basic unit with 3 NO relay enabling contacts and 1 NC relay signaling contact.

Q2. How many NO relay enabling contacts does it have?

It provides 3 NO relay enabling contacts.

Q3. Does it have an NC signaling contact?

Yes. It provides 1 NC relay signaling contact.

Q4. What is the supply voltage?

The unit operates with a 24 V AC/DC supply.

Q5. What type of terminal connection does it use?

It uses screw-terminal connections.

Q6. What series does this safety relay belong to?

It belongs to the Siemens SIRIUS Standard safety relay series.

Q7. Where can it be used?

It can be integrated into appropriately designed industrial machinery, machine safety systems, production lines, automation equipment, and safety-control panels.

Q8. Is the 3SK11111AB30 a complete safety system?

No. It is a safety relay basic unit and must be integrated into a properly designed and validated safety-related control system.