Short-circuit breaking capacity is the headline: 330 kA at 240 V, 242 kA at 415 V and 440 V, 187 kA at 500 V, and 4.5 kA at 690 V. At 690 V the SCCR drops sharply to 4.5 kA, so it's not a 690 V main breaker unless the fault current is very low. Thermal derating is published: full 250 A from 40 °C to 50 °C, then linearly down to 213 A at 70 °C ambient. That 250 A rating holds in a 50 °C panel — good for a hot enclosure. At 70 °C you lose about 15% capacity, which matters when the breaker is in a sealed, non-vented box near other heat sources.
It's an active catalog item in the 3VA2 family, so you can spec it into a new BOM without worrying about a looming EOL.