SIRIUS S3 power contactor for motor loads
The Siemens 3RT1045-1AR10 is a SIRIUS S3 power contactor rated 37 kW at 400 V AC-3 duty, meaning it switches three-phase induction motors up to that load in a standard control panel. Screw-type terminals on the main circuit accept up to 50 mm² stranded cable, so it integrates into panels where ring or fork lugs are preferred over spring-clamp connections. Mounts via screw or snap-on onto 35 mm and 75 mm standard mounting rail, with side-by-side mounting permitted for multi-contactor assemblies.
Ratings and what they mean for the panel
Rated for 1,000 switching operations per hour at AC-3. Operates between -25 °C and +60 °C, with storage down to -55 °C — suitable for unheated plant rooms or outdoor enclosures in temperate climates. IP20 on the front with cover or box terminal; the terminal body itself is IP00, so the contactor needs enclosure protection against dust and accidental contact in the panel. Pollution degree 3 rating means it tolerates conductive dust and humidity typical of industrial control cabinets without conformal coating.
Lifecycle and compliance
RoHS compliance dated 01.05.2012.