The Siemens SIRIUS 3RT1046-1BB40-0UA0 is a Size S3 power contactor designed for switching motor loads in industrial control panels. Its AC-3 rating of 55 kW at 500 V means it handles standard squirrel-cage motors up to that power — the rating that typically governs the selection for pump, fan, and conveyor duty. The 80 A AC-4 rating at 400 V covers the more demanding reversing or inching applications where the contactor makes and breaks stalled rotor current.
Mounting and Integration
Snaps onto standard 35 mm or 75 mm DIN rail — no tools needed for the rail mount, though the screw-type main circuit terminals (accepting up to 2x 50 mm² stranded) will need a screwdriver. The 70 mm width and 146 mm height fit a standard S3 footprint, so it drops into existing panel layouts sized for that frame. Side-by-side mounting is permitted, which saves rail space when grouping multiple contactors.
Environmental and Protection
Rated IP20 on the front with the cover or box terminal fitted — sufficient for enclosed panel use where operators don't contact live parts. The terminal itself is IP00 (no finger protection at the wiring point), so the panel door or enclosure provides the outer safeguard. Operating temperature range of -25 to +60 °C covers most indoor industrial environments; storage range extends to -55 to +80 °C. Pollution degree 3 means it's suited for environments with conductive pollution or dry non-conductive pollution that becomes conductive due to condensation — typical for factory floors without climate control.