At 240 V it's rated 121 kA — that's a very high interrupt rating for an 80 A frame, so it's meant for installations with high available fault current, like a transformer secondary close to the service entrance. At 415 V it's still 75.6 kA, and it drops to 52.5 kA at 440 V, then 11.9 kA at 500 V and 690 V. That steep drop above 500 V tells you this frame is optimized for 240–480 V systems; if you're on a 600 V or 690 V line, the 11.9 kA rating will limit where you can place it in the coordination study.
Current rating and thermal behavior
At 55 °C it drops to 78 A, then 77 A at 60 °C, 75 A at 65 °C, and 74 A at 70 °C. The maximum power loss is 19.2 W, which is modest for an 80 A MCCB with a shunt trip — helps keep the enclosure heat rise manageable.