That 250 A holds steady from 40 °C all the way up to 50 °C, then starts a gentle slope: 241 A at 55 °C, 232 A at 60 °C, 222 A at 65 °C, and 213 A at 70 °C. If your panel runs hot — and most MCC buckets do — that derating curve is what you need for the BOM, not the nameplate number.
Interrupting duty — what those kA numbers mean
This MCCB punches a 187 kA interrupting rating at 240 V, 121 kA at 415 V and 440 V, 79 kA at 500 V, and 5.1 kA at 690 V. The sharp drop to 5.1 kA at 690 V is normal for a 250 A frame; at that voltage the arc extinction physics changes, so you coordinate downstream breakers accordingly.
What's on the side — auxiliary releases and dimensions
If your safety circuit needs a shunt trip or a signal contact, you'll add those externally. The base switch module is 3VA2225-5HN32-0AA0, which is the same frame without the UVR.
Environmental limits and power loss
If you're packing several of these in a row, the cumulative heat load matters for the panel cooling calc.