This is the part you spec into a panel when you need a compact MCCB with a fixed thermal-magnetic curve — no interchangeable trip unit to lose or mis-match on site.
The 125 A frame with TMF trip gives you a fixed instantaneous pickup and thermal overload curve; no dials to seal or settings to verify after commissioning. Wire it, torque it, close the cover.
The XT2L series is ABB's compact MCCB line, sized between the smaller S-series and the full-frame Tmax. The 125 A TMF variant covers motor branch circuits, feeder protection, and panelboard mains where you want a fixed-trip breaker that doesn't rely on an operator to set the dial correctly.