The 3-pole construction handles three-phase systems; the interrupting ratings climb to 330 kA at 240 V AC and hold at 242 kA through 440 V, then drop to 187 kA at 500 V and 9 kA at 690 V.
Key features for panel integration
Physical footprint is 248 mm high, 138 mm wide, 110 mm deep; verify the mounting pattern against the existing panel cutout, but the 3VA family shares a common bolt-hole layout across the frame sizes, so a panel specified around a smaller 3VA2116 frame will accept this 400 A unit without re-drilling.
Selectivity and coordination
The instantaneous trip setting starts at 600 A (minimum) and goes to 6 000 A (maximum), with a short-time withstand of 5 kA limited to 1 second. The full-scale current rating is 400 A, and the initial value for the long-time pickup is 80 A. The trip indicator confirms the breaker has opened on a fault, which saves troubleshooting time on a multi-feeder panel.
The design is line-protection (not motor-protection), so it is suited for feeder and main breaker duty rather than individual motor branch circuits.