The Siemens SENTRON 3VA2110-5HN32-0JA0 is a 3-pole molded case circuit breaker rated for 100 A continuous current and an interrupting capacity of 187 kA at 240 V AC. That interrupting figure drops to 121 kA at 415 V and 440 V, then to 79 kA at 500 V, and 4.25 kA at 690 V — so the voltage class of your distribution panel dictates the available fault current this breaker can safely clear.
Rated 100 A from 40 °C to 50 °C ambient; above that the continuous current derates — 96.25 A at 55 °C, 92.5 A at 60 °C, 88.75 A at 65 °C, and 85 A at 70 °C.
The ETU350 electronic trip unit is the brains — it provides LSI protection (long-time, short-time, instantaneous) with adjustable pickups and time delays, which is what you need for selective coordination on a distribution board. If you need those, the basic switch (3VA2110-5HN32-0AA0) and the integrated auxiliary trip (3VA9688-0BL32) are the building blocks to add them. Mechanical endurance is rated at 20,000 operations — typical for a 100 A frame in panelboard duty.