The best way to switch with SIRIUS Contactors

Four SIRIUS 3RV2 motor starter protectors/circuit breakers aligned after size


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  • and counting … Siemens has sold over 200 million SIRIUS contactors world-wide. SIRIUS is the most comprehensive portfolio available on the market, providing an extensive breath of performance capabilities making them the most flexible and scalable products on the market. SIRIUS contactors offer real flexibility and are easy to use with simple tool and error free installation with either screw or spring-cage connection technology. SIRIUS contactors are also featured in Siemens’ digital engineering and selection tools for virtual planning and design, allowing digital twin “Proof of Concept Testing”.

Technical specifications for Contactors

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SIRIUS Contactor 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 for other loads

Contactor relays and miniature contactors

Contactor relays and miniature contactors

Auxiliary contactors for control and auxiliary circuits.

Highlights at a glance

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.

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