The ABB XT4NU3200AYJ000XXX is a NEXT4N molded case circuit breaker rated 250 A with a TMF 200-2000 thermal-magnetic trip unit, three-pole, fixed front terminals, UL/CSA listed. The TMF trip block gives a fixed thermal pickup with adjustable magnetic short-circuit pickup from 200 to 2000 A — meaning you set the instantaneous trip threshold to match the inrush of a motor or transformer without nuisance tripping on start-up, while the thermal element stays fixed for overload protection.
The UL/CSA listing means the breaker carries third-party certification for North American panel builds — a requirement for UL 508A industrial control panels and CSA C22.2 No. 14 installations. The three-pole fixed front terminal configuration suits front-connected switchboards or panelboard feeder sections where you land cable lugs directly on the breaker line and load terminals.