3SK1121-2CB41

The Siemens SIRIUS 3SK1121-2CB41 is a relay output type safety relay that provides two sets of instantaneous and two sets of delayed (0.05~3 seconds) normally open safety contacts. It features spring-loaded (push-in) terminals for quick wiring, a rated voltage of 24VDC, and complies with PL e and Cat.4 safety classes. It is suitable for safety circuits that require short-delay shutdown.

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Product Positioning

The 3SK1121-2CB41 is a SIRIUS 3SK1 series relay-type safety relay with a built-in short delay function of 0.05 to 3 seconds and a spring-loaded (push-in) terminal, suitable for safety circuits that require rapid buffer stop.

Core Product Advantages and Features

Relay mechanical contact output

It provides safety output using mechanical relay contacts and is suitable for general industrial safety interlock circuits.

Adjustable delay from 0.05 to 3 seconds

The delayed enable output range is relatively short, making it suitable for machine applications that require rapid buffer shutdown.

Spring-loaded push-in terminal

Screwless quick-connect wiring shortens installation and maintenance time and reduces the risk of loosening.

High security level certification

Compliant with ISO 13849-1 PL e, Cat.4 and IEC 62061/61508 SIL3 level

project	Specification
Security level	PL e (ISO 13849-1) / Category 4 / SIL 3 (IEC 62061, IEC 61508)
Rated voltage	Us = 24 V DC
Delay range	0.05 ~ 3 seconds (adjustable)
Safe output	2 instantaneous normally open relays + 2 delayed normally open relays
Wiring method	Spring-loaded (push-in) terminal

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