What this 400 A MCCB carries
That 400 A holds flat from 40 °C up to 50 °C; above that it derates to 384 A at 55 °C, 376 A at 60 °C, 368 A at 65 °C, and 360 A at 70 °C. For a panel builder, that means the breaker can sit in a warm enclosure without losing headroom until the ambient passes 50 °C. Breaking capacity runs 242 kA at 240 V, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 40 kA at 690 V.
The 3VA2440-6HN32-0CA0 measures 248 mm high by 138 mm wide by 110 mm deep.
What the ETU350 release does
No communication function, no phase-failure detection, no voltage trigger. The trip indicator is also absent, so fault isolation relies on the breaker position or a separate auxiliary contact (not included).