It carries interrupting ratings of 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 7.5 kA at 690 V — so it handles high-fault utility feeds and large motor branch circuits without cascading upstream. The 400 A frame means it's sized for main or heavy feeder duty, not sub-feed or lighting panels.
Continuous current holds 400 A from 40 °C through 50 °C, then derates linearly to 340 A at 70 °C — so in a warm enclosure you still have margin, but above 50 °C you lose 15 A per 5 °C step. Maximum power loss is 96 W, which matters for thermal coordination inside a sealed cabinet. That means it reports status and can be remotely tripped without adding external relays.