225 A thermal-magnetic MCCB for panel-mount distribution
The ABB XT3NU3225AFF000XXX is a 225 A, 3-pole molded case circuit breaker from the Tmax XT3 family, rated 480 VAC with an 18 kA interrupting capacity at that voltage. Panel-mount construction with front flat terminals suits fixed-mount distribution panels where the breaker is wired directly into the bus rather than plug-in or drawout chassis.
Sourcing and fit verification
The 225 A fixed thermal-magnetic trip unit is non-interchangeable on this variant — the trip setting is factory-set and not field-adjustable, so confirm the continuous load current matches the 225 A rating before specifying. For a panel originally specified around the lower-rated XT1NU3090AFF000XXX (90 A), the XT3NU3225AFF000XXX shares the same Tmax XT platform but uses a larger frame size (XT3 vs XT1) — the mounting footprint and bus connections differ, so a direct drop-in without rewiring is not possible.