What it is and what it does
The Siemens SIRIUS 3RT1017-1AU62 is a size S00 power contactor with three normally-open main contacts, designed for switching motor loads in industrial control panels. It is rated for AC-2 duty at 5.5 kW at 400 V, which means it handles wound-rotor motor starting and reversing up to that power level, and delivers 8.5 A in AC-4 duty for plugging and inching applications. The 45 mm wide footprint and screw-and-snap-on mounting to 35 mm DIN rail per EN 50022 mean it fits standard panel layouts without extra bracketing. Front protection is IP20, so it is safe for finger contact inside an enclosed panel but not for washdown environments.
Key ratings and what they mean
The AC-2 rating at 5.5 kW at 400 V governs motor switching for slip-ring or wound-rotor motors — the contactor makes and breaks the current at full load, so this is the number to match against your motor nameplate. The AC-4 rating of 8.5 A at 400 V is lower than the AC-3 equivalent would be, reflecting the higher electrical wear from inching or reversing duty. Main circuit termination is screw-type terminals accepting 2x (0.5 to 1.5 mm²) solid, 2x (0.75 to 2.5 mm²) solid, or up to 2x (0.75 to 4 mm²) stranded. For AWG, that's 2x (20 to 16), 2x (18 to 14), or 1x 12. Type 1 coordination requires a 35 A gL/gG fuse; Type 2 coordination requires a 20 A gL/gG fuse. Operating temperature range is -25 to +60 °C, with a maximum operating altitude of 2,000 m. The contactor is rated for pollution degree 3, meaning it tolerates conductive pollution in typical industrial enclosures.
Panel integration
Mounts via screw and snap-on onto 35 mm standard mounting rail per DIN EN 50022. Side-by-side mounting is permitted with a minimum 6 mm spacing to adjacent devices. Depth is 72 mm, height 57.5 mm, so it fits compactly in a 45 mm-wide DIN slot.