It carries a 100 A rating at 40 °C (holds the same 100 A through 50 °C, then derates to 98 A at 55 °C, 96 A at 60 °C, 94 A at 65 °C, and 91 A at 70 °C), so in a warm enclosure you lose less than 10 % of capacity even at the top of the operating range. Breaking capacity is the headline number for an MCCB: this unit delivers 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 at 240 V covers high-fault utility feeds in North American panels; the 75.6 kA at 415 V handles most European industrial service entrances. The 11.9 kA at 690 V is the ceiling for the insulation voltage of 800 V — the breaker is rated for the full 690 V line, not just a 480/277 V system.
Width is 3 in. Maximum power loss is 25 W at rated load. That's modest for a 100 A breaker, but in a densely packed panel with multiple breakers side by side, the cumulative heat matters — the derating curve above 50 °C is the real-world limit to watch. The storage low-end matters for unheated warehouses in cold climates — the breaker can sit at -40 °C without damage.