The 187 kA breaking capacity at 240 V tells you it can interrupt a fault up to that level without the arc re-striking; at 415 V that figure is 121 kA, at 440 V it's 75.6 kA, and at 500 V or 690 V it holds at 17 kA. That's a high-interrupting rating for a frame this size — it's built for high-fault locations like a transformer secondary or a service entrance.
The 80 A rating is the nominal frame current, but the breaker's actual continuous current depends on ambient temperature. At 55 °C it's 158 A, at 60 °C it's 155 A, at 65 °C it's 153 A, and at 70 °C it's 150 A. The maximum power loss is 38 W, which is modest for a 4-pole breaker at this current; helps keep the internal temperature rise manageable.
That's a 4-inch wide footprint on the DIN rail or panel-mount plate — standard for a 4-pole MCCB in this frame class. Keep it simple: wire it, torque it, move on.