That 250 A holds steady up to 50 °C ambient; at 55 °C it derates to 241 A, at 60 °C to 232 A, and at 70 °C to 213 A — so if your panel runs hot near the top of a dense enclosure, use the 55 °C or 60 °C column for sizing, not the nameplate.
Breaking capacity — where the numbers matter
Short-circuit ratings here are not one-size-fits-all. At 240 V it interrupts 187 kA; at 415 V and 440 V it holds 121 kA; at 500 V it drops to 79 kA; at 690 V it's 5.1 kA. For a 480 V panel in North America (common industrial distribution), the relevant figure is the 500 V column at 79 kA — that's the one your coordination study needs.
Dimensions are 181 mm high, 105 mm wide, 86 mm deep — a standard 3-pole MCCB footprint for the 250 A frame class. The undervoltage release is wired separately; the two HQ auxiliary switches give you position feedback for your PLC or status lamp without needing an add-on module.