The interrupting ratings are the headline: 440 kA at 240 V, 330 kA at 415 V and 440 V, 220 kA at 500 V, and 52.5 kA at 690 V. The 690 V rating (52.5 kA) means it can sit on a 690 V line without cascading upstream, which is rare for a 25 A MCCB.
Trip unit and thermal performance
The ETU320 electronic trip unit allows adjustable overload and short-circuit settings — not a fixed thermal element. Minimum trip setting is 38 A, maximum 300 A, so the same breaker frame can be tuned for different load sizes by swapping the trip unit or adjusting the dial. Power loss is a low 0.5 W maximum — negligible for panel thermal calculations.