It also includes phase failure detection, so if one leg drops on a three-phase motor, the breaker trips before single-phasing cooks the winding. Rated continuous current Iu is 100 A, and the thermal derating is published: it holds 100 A from 40 °C through 50 °C, then drops to 96 A at 55 °C, 94 A at 60 °C, 92 A at 65 °C, and 90 A at 70 °C. The breaker itself dissipates up to 75 W at full load, so that heat contributes to the internal ambient. At 240 V it's rated 187 kA; at 415 V and 440 V it's 121 kA; at 500 V it drops to 75.6 kA; at 690 V it's 17 kA. If your transformer secondary can push 100 kA at 480 V, this breaker covers it.
Footprint is 105 mm wide, 181 mm tall, 86 mm deep — standard 3-pole MCCB form factor for a 100 A frame. If this goes into a refrigerated warehouse or an outdoor cabinet in a northern climate, the cold-end spec is fine. The 80 °C storage max means it can sit in a hot shipping container without damage.