The XT5HU440ABFF000XXX: The 400 A frame and TMA trip unit mean this MCCB is sized for main feeder or large branch-circuit protection in industrial switchboards and motor control centers. The TMA trip provides adjustable thermal (overload) and fixed magnetic (short-circuit) protection curves, so the same breaker can be dialed in for cable protection or motor starting duty without swapping the trip unit. That adjustability saves panel space and reduces spare-part count on site.
The 400 A frame size dictates busbar and cable lug dimensions — verify the line-side lug kit matches your copper cross-section before terminating. In a typical industrial MCC lineup, this breaker occupies a single draw-out cassette position.
Lifecycle stage is current. No PCN or EOL notice is on record for this order code.