3SK1121-2AB40
The Siemens SIRIUS 3SK1121-2AB40 is a relay output type safety relay, providing 3 sets of normally open safety contacts and 1 set of normally closed signal contacts. It does not have a delay function, has spring-loaded (push-in) terminals, a rated voltage of 24VDC, and meets PL e, Cat.4 safety class. It is suitable for general safety interlock circuits.
Product Positioning
The 3SK1121-2AB40 is the basic model of the SIRIUS 3SK1 series relay-type safety relay. It does not have a time delay function and uses spring-loaded (push-in) terminals, making it suitable for quick installation in standard safety interlock applications.
Core Product Advantages and Features
Relay mechanical contact output
It provides a safety output using mechanical relay contacts and is suitable for general industrial safety interlocking circuits.
3 sets of normally open safety contacts
Provides 3 sets of normally open safety output contacts, which can correspond to multiple sets of safety loads or series circuits.
1 set of normally closed signal contacts
An additional normally closed contact can provide feedback on the safety status for use by the higher-level monitoring unit.
Spring-loaded push-in terminal
Screwless quick-connect wiring shortens installation and maintenance time and reduces the risk of loosening.
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3SK1121-2CB41
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3SK1121-1CB44
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3SK1121-1CB42
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