Breaking capacity is 187 kA at 240 V, dropping to 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 17 kA at 690 V — the 415 V figure governs most European industrial distribution panels; the 690 V rating is the limiting case for 690 V line-ups. Temperature derating is minimal up to 50 °C (full 400 A), then drops to 384 A at 55 °C, 376 A at 60 °C, 368 A at 65 °C, and 360 A at 70 °C — the 55 °C step is where you lose headroom; plan the enclosure ventilation if ambient exceeds 50 °C.
Dimensions are 110 mm deep, 138 mm wide, 248 mm tall — the 138 mm width is standard for 400 A frame MCCBs on DIN-rail or backplate mounting; verify the gland plate cutout against the existing panel layout if retrofitting into a tight enclosure.
The ETU350 trip unit is a fixed-configuration electronic release; there is no communication module or phase-failure detection on this variant — the basic switch base is 3VA2440-5HN32-0AA0, and the integrated auxiliary trip is 3VA9608-0BB24.