What this 3VA2 MCCB brings to a 400 A feeder
That matters when you need selectivity downstream or want to dial in coordination with a transformer inrush or motor starting profile. No derating curve to chase inside a hot panel. The interrupting capacity runs 440 kA at 240 V, 330 kA at 415/440 V, 220 kA at 500 V, and 52.5 kA at 690 V (–) — that's serious fault-clearing headroom for a 400 A frame, especially on a 480 V or 600 V class distribution board where SCCR requirements climb. This is a straight feeder breaker — no frills, no auxiliary electronics to fail. The 63.5 W maximum power loss is the heat you need to vent; factor it into the enclosure sizing if the panel is tight.
Panel fit and footprint
The 3VA2440-8HN32-0AA0 measures 248 mm tall, 138 mm wide, and 110 mm deep. No condensation allowed during operation — standard MCCB practice.