Schneider Electric C11B6TM100B is a 4-pole ComPacT NSXm moulded-case circuit breaker rated 100 A at 40 °C with a 25 kA breaking capacity at 415 V AC — that's the interrupting rating you need for a distribution board fed from a transformer of that size, not a motor branch. The thermal-magnetic TM-D trip unit handles overloads and short-circuits in one package, no add-on module needed.
Mount it in a warmer enclosure or next to other heat sources and you'll need to derate — the TM-D thermal element responds to ambient temperature, so a crowded panel at 50 °C might knock that down to 90 A or so. Plan your fill factor accordingly.
The 108 mm width spans 12 module pitches at 9 mm each, so it'll occupy about the same space as twelve single-pole MCBs side by side. Connection terminals accept compression lugs or busbars; front-facing connections on both top and bottom keep the wiring plane accessible for panel builders. Neutral is on the left, which matches the standard busbar layout for most distribution boards. The toggle control gives clear mechanical on/off indication, and the green flag signals when auxiliary contacts are present — handy for a quick visual check without opening the panel door.