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Siemens 3SK1121-1AB40 SIRIUS Advanced Safety Relay

Siemens 3SK1121-1AB40: SIRIUS advanced safety relay, 3 NO + 1 NC, 24V DC, screw terminals.

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ManufacturerSiemens

Part number3SK1121-1AB40

Series SIRIUS

Type Advanced Unit

Enabling Circuits 3 NO

Signaling Circuit 1 NC

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3 enabling circuits (NO) 1 signaling circuit (NC) 24 V DC operation Screw terminals Advanced safety functions SIRIUS series

Product description

The Siemens 3SK1111-1AB40 is an advanced unit within the SIRIUS safety relay series, offering enhanced capabilities for industrial safety control. This relay is powered by 24 V DC and features three normally open (NO) contacts for enabling safe machine operation and one normally closed (NC) contact for feedback or signaling. It uses standard screw terminals for reliable and familiar electrical connections.

This advanced safety relay is suitable for more complex safety functions beyond basic emergency stops, such as interlocking devices and safety mats, across various industries like food and beverage, pharmaceuticals, and general manufacturing. Its robust design ensures high availability and performance in demanding environments.

Stanlo Automation, your trusted veteran-owned surplus parts distributor, provides the Siemens 3SK1111-1AB40. We are committed to offering quality industrial automation components at competitive prices, ensuring your safety systems are both effective and economical. Procure your advanced safety relays from Stanlo Automation.

Technical specifications

Series	SIRIUS
Type	Advanced Unit
Enabling Circuits	3 NO
Signaling Circuit	1 NC
Supply Voltage	24 V DC
Terminals	Screw

Common applications

Machine guarding

Safety mat monitoring

Interlocking devices

Emergency stop circuits

Safety gate controls

Compatible systems

SIRIUS control components Safety input devices (e.g., E-stops, light curtains) PLC safety I/O Advanced machine control panels

Also known as

Siemens SIRIUS Advanced Safety Module 3SK11 Advanced Safety Relay Siemens 24V DC Safety Relay

Replaces / compatible with

Replaces older Siemens safety relays with 3 NO + 1 NC contact configurations and 24V DC input, suitable for applications requiring advanced safety logic.

Technical note

Expert tip

For advanced safety functions, ensure the input devices connected to the enabling circuits meet the required safety integrity level (SIL) and performance level (PL) standards.

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Frequently asked questions

Can the 3SK1121-1AB40 be used for monitoring safety mats?

Yes, the Siemens 3SK1121-1AB40 is suitable for monitoring safety mats. Its advanced capabilities and reliable 3 NO + 1 NC contact configuration allow it to be integrated into safety circuits designed to detect presence and initiate machine shutdown when a safety mat is triggered.