What this 400 A MCCB carries
The ABB XT5HU340ABFF000XXX is a SACE XT5H molded case circuit breaker rated for 400 A continuous at 600 VAC, with a 65 kA interrupting capacity that clears high-fault bolted faults without cascading upstream — critical for main or feeder positions in distribution panels where the available fault current is known to hit that level. Three poles, front terminal configuration, with a TMA (thermal-magnetic adjustable) trip unit.
Integration notes
Front terminal design suits panelboard or switchboard bus connections where rear-connect is not an option. TMA trip unit allows field adjustment of the thermal pickup and magnetic instantaneous settings — useful for coordinating with downstream branch breakers on a motor control center or lighting panel schedule.