The ABB XT4HU3150AYJ000XXX is a NEXT4H 250 TMF 150-1500 3P F F UL/CSA molded case circuit breaker. It carries a fixed thermal-magnetic trip unit adjustable from 150 A to 1500 A, three-pole, with line and load terminals on the front face. The UL/CSA listing means it meets North American panelboard and switchboard requirements — no additional fuse block or supplementary protector needed for most distribution feeds.
The TMF 150-1500 trip unit gives you a continuous current range from 150 A up to 1500 A via a single adjustment dial. That's a wide band — useful for a feeder that might get re-tapped for a different load without swapping the breaker body. Three-pole front-face terminals make it a straightforward swap into an existing ABB NEXT4H panelboard bucket.