SIRIUS contactors

Switching with SIRIUS means high contact reliability, prolonged endurance and usability in extreme conditions. The integration of SIRIUS contactors in engineering and selection tools support you in digitalization.

SIRIUS contactors portfolio

Power contactors for motors

Power contactors for switching motors

Switching of electric drives or motors: a classic product with a decades-old functional principle interpreted in a modern and future-oriented way: these are our contactors, a generalist for switching motors.


Whether switching normal motors or high-efficiency motors (IE3), whether reversing or star-delta starting from the smallest to the largest power range, whether classic screwing or connecting using spring-cage technology or direct digital control. Our motor contactors can do all this and much more. No drive is too small or no motor start-up too heavy.

Contactors with certified F-PLC input

Contactors with certified F-PLC input

SIRIUS contactors with certified F-PLC input are available for your application for triggering from failsafe controllers, standard controllers and safety switchgear from 18.5kW up to and including 250kW.

The fail-safe inputs make it possible to achieve SIL 2 (IEC 62061) or PL c (ISO 13849-1) with only one contactor. SIL 3 or PL e can be achieved by using two contactors in series.

The Safety Evaluation integrated in the TIA Selection Tool (TST) helps you to evaluate your machine quickly and safely, taking into account its safety functions (evaluation according to IEC 62061 and ISO 13849-1).

Contactors for other loads

Contactor relays and miniature contactors

Contactor relays and miniature contactors

Auxiliary contactors for control and auxiliary circuits.

Contactor combinations

Contactor combinations

Star-delta combinations

Star-delta combinations are the reliable solution for the staged startup of asynchronous machines. The starting current is reduced by one third compared to a delta startup. The required ramp-up time up to the rated speed in star startup can be set via a timing relay.


Reversing contactor assemblies

For safe and reliable changes in the direction of rotation of asynchronous motors, the pre-assembled SIRIUS reversing combinations from 3 kW to 55 kW (self-assembly kit from 3 kW to 250 kW) are available. They consist of two contactors of the same rating with an NC contact from 3 kW to 7.5 kW or an NO contact and an NC contact from 5.5 kW to 55 kW in the basic unit.

Highlights at a glance

Rugged and reliable

SIRIUS 3RT contactors Thanks to their extreme ruggedness and outstanding contact reliability, our contactors switch supremely and reliably.  In addition, they enable compact control cabinets with high packing density. With integrated ranges of accessories for sizes S00 to S3 as well as S6 to S12, individual function expansions can be implemented with no great effort. In sizes S00 to S3, the contactors even have the auxiliary switches integrated into the enclosure.

Reliable switching and protection of large currents

SIRIUS 3RT contactors up to 2,650 A - the perfect combination for wind turbines or converters.

Efficient wiring of switchgear

Which connection technology do you use for your switchgear? Have you already tried out spring-cage technology? Now compare conventional screw technology with modern spring-cage technology. We will show you how to connect and install your switchgear quickly and without errors.

SIRIUS contactors with failsafe control input – innovative and powerful

Downloads, Tools and Support for SIRIUS contactors

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