The ABB XT2NU3030AFF000XXX is a molded case circuit breaker (MCCB) from the XT2N series, rated 125 A frame with a TMF (thermal-magnetic fixed) trip unit adjustable from 30 A to 400 A. The 3-pole configuration with line and load lugs (F F) makes it ready for panel wiring without additional accessories. UL/CSA listing confirms acceptance in North American industrial panels.
The 125 A frame fits standard MCCB cubicle cutouts; the TMF trip unit is field-adjustable between 30 A and 400 A, so one part covers a wide branch-circuit range.