At 415 V and 440 V it still holds 187 kA, dropping to 121 kA at 500 V and 4.5 kA at 690 V, so the interrupting rating follows the voltage curve as expected for this class. Thermal derating matters when you're packing breakers into a warm enclosure: at 40 °C ambient it carries the full 250 A, but at 55 °C it's 241 A, at 70 °C it's 213 A. The breaker also carries 2 auxiliary switches plus a trip alarm switch (HQ design), which gives remote status indication without needing an external relay.
That 105 mm width for a 3-pole 250 A frame is typical for the SENTRON 3VA2 platform — it'll drop into a standard MCCB cutout pattern. If you're swapping an older 3VA2 variant, the footprint is the same; the wiring lugs and bus-bar connections are in the same positions. No re-drilling the backplate.