What the breaking capacity ratings mean
The 3VA2110-5MN36-0AD0: This breaker punches 187 kA at 240 V, drops to 121 kA at 415 V and 440 V, then 75.6 kA at 500 V, and still holds 17 kA at 690 V. For a 100 A frame, that's a high-interrupting-capacity (HIC) device; it handles stiff utility feeds or transformer-secondaries where fault current runs hot.
Thermal derating and site conditions
At 55 °C it derates to 96 A, at 60 °C to 94 A, at 65 °C to 92 A, and at 70 °C to 90 A. If your panel sits near a hot motor or a sunny wall, that derating curve tells you exactly where the trip threshold lands — no guessing. Max power loss is 75 W, so account for that heat in your enclosure sizing.