3SK1121-1AB40

The Siemens SIRIUS 3SK1121-1AB40 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, uses screw terminal wiring, has a rated voltage of 24VDC, meets PL e and Cat.4 safety classes, and is suitable for general safety interlock circuits.

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Siemens SIRIUS 3SK1121-1AB40 basic model relay-type safety relay product photo

Product Positioning

The 3SK1121-1AB40 is the basic model of the SIRIUS 3SK1 series relay-type safety relay. It does not have a time delay function, uses screw terminal wiring, and is suitable for standard safety interlocking 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.

Screw terminal wiring

Standard screw terminal wiring method, compatible with existing wiring installation habits.

project	Specification
Security level	PL e (ISO 13849-1) / Category 4 / SIL 3 (IEC 62061, IEC 61508)
Rated voltage	Us = 24 V DC
Safe output	The relay has 3 sets of normally open contacts + 1 set of normally closed signal contacts.
Wiring method	Screw terminals

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