What this 400 A MCCB carries
That ETU320 gives you adjustable thermal and magnetic trip curves, which is what you want when coordinating downstream feeders in a distribution panel.
Breaking capacity — where it clears faults
Short-circuit rating hits 121 kA at 240 V, drops to 75.6 kA at 415 V and 440 V, then 52.5 kA at 500 V, and 7.5 kA at 690 V. At 400 V class (415/440 V) the 75.6 kA still covers most industrial service-entrance duty.
That means a panel running hot near the top of its thermal envelope still gets 340 A out of this frame. Dimensions are 248 mm high, 138 mm wide, 110 mm deep — standard SENTRON 3VA2 footprint, so it swaps into an existing 3VA2 panel cutout without reworking the bus bars. IP40 on the front face only; the body is open for heat shedding inside the enclosure.