For reversing or inching duty (AC-4), it's rated 35 A at 400 V — enough for frequent plugging or jogging on a conveyor or hoist. The coil draws 10 A at 24 V (inrush) and holds at 2 A at 60 V, with a drop-out time of 7 to 20 ms and arcing time of 10 to 15 ms. That arc time matters for coordination with upstream fuses or breakers — short enough to let a fast semiconductor fuse clear a fault without welding the main contacts.
Occupies 55 mm width on the rail, 112 mm tall, 164 mm deep — the depth is the dimension that often catches panel layouts when replacing an older contactor with a deeper arc chamber. Main circuit terminals accept 2x (0.5 to 1.5 mm²) solid, 2x (0.75 to 2.5 mm²) solid, or up to 4 mm² solid per clamp. Stranded goes up to 2x (0.75 to 25 mm²) — plenty for the 16 mm² minimum at 40 °C. Screw-type terminals, so torque to the value on the nameplate.
The 3RT1044-1FB46 is a larger frame (S3 vs S2) with higher motor ratings — typically 30 kW AC-3 at 400 V. The 3RT1035-1AP08-0MA0 tops out at 18.5 kW AC-2. If your BOM calls for the S3 frame, the S2 won't fit the same mounting hole pattern or busbar spacing. Stick with the S2 if your load is under 18.5 kW and you want the narrower 55 mm width.