The ETU320 electronic trip unit gives adjustable protection curves, so it's not a fixed-thermal breaker; you can dial in the trip settings to match the downstream load.
Breaking capacity — the number that decides the fault rating
Breaking capacity varies sharply with system voltage: 121 kA at 240 V, 75.6 kA at 415 V and 440 V, 52.5 kA at 500 V, and 3.7 kA at 690 V. At 415 V it handles 75.6 kA, which covers most industrial secondary distribution.
That's a 4-pole MCCB footprint — wider than a 3-pole unit by about one pole pitch. The 86 mm depth fits standard distribution panelboards; no special deep enclosure needed.
Insulation voltage rated 800 V, so it's suitable for 690 V systems (the insulation holds).