That 100 A holds flat from 40 °C to 50 °C — no derating needed in a typical warm panel — then steps down to 96 A at 55 °C, 94 A at 60 °C, 92 A at 65 °C, and 90 A at 70 °C. The 187 kA breaking capacity at 240 V is what interrupts a massive fault without the arc flashing upstream — at 415 V it's still 121 kA, at 440 V it's 75.6 kA, and at 690 V it drops to 17 kA. This is a straight thermal-magnetic breaker — no electronics to fail, no settings to lose on a power cycle.
The 130 mm height and 70 mm depth leave room for cable entry below the line terminals. Latching endurance is 15 000 operations — that's the mechanical life, not the electrical switching life under load.