That 80 A holds flat up to 50 °C — at 55 °C it derates to 76.8 A, and at 70 °C it still carries 72 A, so the thermal curve is generous for a warm panel. The interrupting ratings are the headline: 220 kA at 240 V, 154 kA at 415 V, 121 kA at 440 V, and 17 kA at 690 V. The 690 V rating at 17 kA is the one to watch if you are on a 600 V class system; the gap from 440 V to 690 V is steep.
That 76.2 mm width is three 25.4 mm pole spaces — standard for a 3-pole MCCB on a DIN rail or panel-mount footprint. IP40 on the front — no gasket seal, so not for washdown zones, but fine for a dry indoor panel. The 15 000-cycle mechanical endurance is the latching count; for a main breaker that cycles a few times a year that is effectively lifetime, but if this is used as a disconnect that sees daily operation, factor that into maintenance planning.