The 80 A setting handles typical feeder and branch-circuit protection on 480 V systems, with the 400 A magnetic pickup and 800 A instantaneous override giving you selectivity headroom downstream. The 3-pole, 3-phase fixed-front (3PFF) format is common in UL/CSA panelboards and switchboards — the fixed front means the breaker mounts directly to the bus without a plug-in cradle.
The XT2L 125 frame is a compact MCCB — about 90 mm wide per pole — so it fits standard DIN-rail or panel-mount enclosures without hogging space. The TMA trip is field-adjustable for the thermal (Ir) and magnetic (Im) thresholds, which matters when you're coordinating with downstream feeders on a mixed-load panel.