The Siemens SENTRON 3VA2110-6HN32-0AE0 is a 3-pole molded case circuit breaker (MCCB) rated for 100 A continuous current at 40 °C, with an ETU350 electronic trip unit. It's built for line protection — meaning it sits at the feeder or main distribution point, not on a motor branch. The interrupting ratings tell you where it can go: 242 kA at 240 V AC, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 5 kA at 690 V. The ETU350 trip unit is electronic, not thermal-magnetic, so it gives you adjustable long-time, short-time, and instantaneous pickup settings — that's the kind of curve shaping you need for selective coordination downstream. The breaker carries a 20 000-cycle latching endurance — that's the mechanical life for the latching mechanism, not the electrical switching life under load. For a main breaker that sees maybe a few operations a year, that's effectively lifetime; for a frequently switched load, you'd want to check the electrical endurance curve.
Above that it steps down: 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 maximum power loss is 10 W, which is modest for a 100 A frame.