It carries 80 A continuously at 40 °C — the rating holds flat through 50 °C, then derates to 74 A at 70 °C, which matters if you are stuffing it into a warm cabinet with other heat sources. The interrupting capacity tells you where it can go: 121 kA at 240 V AC, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at both 500 V and 690 V. That 121 kA figure at 240 V is what you need for high-fault utility feeds or transformer secondaries in North American panels; the 75.6 kA at 415 V covers European 400 V distribution with a solid margin.
The 76.2 mm width (3 inches) is the standard 3-pole MCCB footprint for SENTRON 3VA. Comes factory-fitted with 2 auxiliary switches HP (high-performance) — that is the switching capacity for signaling the breaker state back to a PLC or status lamp.