What the 400 A frame means for panel integration
The XT5HU330AEFF000XXX: The 400 A frame (XT5H) determines the physical footprint and busbar connection pattern — it mounts in the standard ABB XT5 drawout or fixed version, with the EKI trip unit providing adjustable thermal-magnetic or electronic protection curves. In a panel, this frame size typically requires a minimum enclosure depth of around 300 mm for cable bending radius and arc-flash clearance. The EKI trip unit supports LSIG protection (long-time, short-time, instantaneous, ground fault) configurable via the front keypad.