At 415/440 V it still holds 187 kA, and at 690 V it's 40 kA, so the part scales across voltage levels without swapping frames. The ETU320 release offers adjustable thermal-magnetic or electronic protection curves depending on configuration — this is the same trip platform used across the 3VA2 frame family, so settings and accessories carry over.
At 55 °C it drops to 384 A, at 60 °C to 376 A, and at 70 °C to 360 A. If the enclosure runs hot (stacked breakers, poor airflow), the 55 °C and above figures are the ones to size against, not the 400 A nameplate.