Breaking capacity is the headline here: 220 kA at 240 V AC, 154 kA at 415 V, 75.6 kA at 440 V, and 17 kA at both 500 V and 690 V. That 220 kA figure at 240 V means this breaker can safely interrupt a fault current up to 220,000 A without welding its contacts or rupturing the case — critical for high-fault installations like transformer secondaries or large motor control centers where the available fault current is well above what a standard 65 kA or 100 kA MCCB could handle.
Above that it drops: 122 A at 55 °C, 120 A at 60 °C, 117 A at 65 °C, 114 A at 70 °C.