The 3VA1220-4EE32-0AA0: The interrupting ratings step down with system voltage: 121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, 17 kA at 500 V, and 11.9 kA at 690 V. That 121 kA figure at 240 V is the one that matters for North American 240/120 V split-phase or 240 V delta services — it gives plenty of headroom above typical available fault currents, so selectivity with downstream breakers is easier to achieve. The 200 A rating holds from 40 °C through 50 °C, then derates to 194 A at 55 °C, 188 A at 60 °C, 182 A at 65 °C, and 176 A at 70 °C.
That 105 mm width is three 35 mm DIN-module slots if you are thinking about rail space in a packed enclosure — it will occupy three full positions on the DIN rail. The 70 mm depth keeps it from projecting far past the backpanel, which helps when the enclosure has a shallow gland plate or a rear-mounted busbar system.