The Siemens 3RT1017-1BD41 is a SIRIUS power contactor in the compact size S00 frame, with a 24 VDC solenoid coil drawing 3.3 W for both pick-up and hold. It is rated for motor switching in AC-3 duty up to 5.5 kW at 400 V, and carries the same power rating at 500 V and 690 V per the datasheet.
The AC-3 rating of 5.5 kW at 400 V tells you this contactor handles a standard 3-phase induction motor up to that shaft power under starting conditions — the contacts are sized for the inrush and the breaking of the running load. For AC-4 duty (plugging, inching, reversing), the rated operational current is 8.5 A at 400 V, which is the figure to use when the motor sees frequent reversals or jogging. The DC coil consumes 3.3 W continuously, so the control transformer or PLC output needs to supply that without voltage drop below the 0.85 x 24 V pick-up threshold. This lets the panel builder size the branch protection correctly for the required selectivity. The screw terminals accept solid or stranded conductors: 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), and up to 2x (0.75 to 4 mm²) maximum. AWG equivalents are 2x (20 to 16), 2x (18 to 14), and 1x 12. IP20 on the front and terminals means finger-safe but not protected against moisture — install inside a panel with at least IP54 enclosure.