What the ratings mean for fit
The Siemens 3RT2035-1AL20-Z W97 is a SIRIUS 3RT power contactor rated 41 A in AC-3e/AC-3 duty, switching three-phase motor loads up to 18.5 kW at 400 V. The 230 V AC coil at 50/60 Hz matches standard control-voltage transformers in most European and Asian panels.
Integration into the panel
Size S2 snaps onto a standard DIN rail (35 mm) and occupies about 114 x 55 x 130 mm of enclosure space. The 3-pole power circuit lands on the top and bottom screw terminals; the coil and auxiliary contacts are on the front face, clearly marked. If you're replacing an older SIRIUS 3RT or a 3TF contactor, the footprint and terminal layout are the same — no re-drilling the backplate. Multi-unit packaging means this order code ships six contactors in one carton, so for a panel with multiple motor starters you get consistent parts in one bin.