Its interrupting capacity hits 330 kA at 240 V, dropping to 242 kA at 415 V and 187 kA at 500 V — numbers that matter when coordinating with upstream gear in high-fault industrial feeds.
The 250 A rating holds steady from 40 °C up to 50 °C, then derates to 241 A at 55 °C and 213 A at 70 °C — so in a warm enclosure without forced cooling, you lose about 15% of headroom. That 330 kA at 240 V is the maximum short-circuit current the breaker can safely interrupt; at 690 V it drops to 4.5 kA, reflecting the arc-quenching limits at higher voltage.
Physical integration
No DIN-rail mounting; it bolts directly to the backplate or mounting pan.