The ABB XT4NU3150FFF000XXX is a TMAX molded case circuit breaker, rated 250 A, 3-pole, designed for main or feeder protection in commercial and industrial distribution panels. The 250 A frame covers heavy branch circuits, large motor loads, or incoming mains in a sub-panel — the kind of duty where you need selective coordination downstream and a single interrupting device that doesn't leave half the plant dark when a fault clears.
Lifecycle stage is current — ABB still lists this order code as an active catalog number. No phase-out notice or last-time-buy date exists.
Deployment context
Mounts in a standard panel with busbar or cable connections — no special adapter needed. The TMAX family is a common fit in ABB's SACE switchgear lineup, so it coordinates with upstream SACE breakers and downstream terminal blocks without a mismatch in mounting or termination.