The interrupting rating is 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. These figures define where this breaker can be applied in a selective coordination study — at 415 V it clears a 75.6 kA fault without upstream devices needing to open.
Thermal performance and panel fit
Rated 80 A from 40 °C through 50 °C ambient, then derates to 78 A at 55 °C, 77 A at 60 °C, 75 A at 65 °C, and 74 A at 70 °C. In a warm enclosure — say 55 °C inside a non-ventilated panel — you lose 2 A of headroom.