The 100 A rating holds flat from 40 °C through 50 °C; above that it derates to 96 A at 55 °C, 94 A at 60 °C, 92 A at 65 °C, and 90 A at 70 °C — so in a warm panel you lose headroom, not the full rating. The interrupting capacity tells you where this breaker can sit in the fault-current hierarchy: 121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at 690 V. Those are the SCCR values the breaker can clear without welding or rupturing; match them against your transformer or utility fault study.
This is a 3-pole MCCB with a width of 76.2 mm, height of 130 mm, and depth of 70 mm. It ships without an auxiliary contact block or undervoltage release; the shunt trip (STL) is the only integrated auxiliary release. No communication function, no phase failure detection, no ground fault monitoring — this is a straight line-protection breaker, not a multifunction power monitor.