No earth-leakage module fitted, so this is a straight distribution breaker, not an RCCB. Rated at 100 A, it feeds a sub-distribution board or a heavy load like a large HVAC unit or a welding bank. The 3-pole form suits three-phase systems; for single-phase tap-offs you'd land on one pole and track the neutral separately. Mounts on a backplate (not DIN rail — note the 9-module pitch at 9 mm per module means 81 mm width, so it fills a standard 9-module cutout in a panel).
Front connection top and bottom — compression lug or busbar. Connection pitch is 35 mm with spreaders, 27 mm without. That matters for busbar alignment: if you're running a common busbar across a row of breakers, the 35 mm pitch with spreaders matches standard distribution busbar spacing. The toggle handle gives positive visual indication of trip state; the green flag signals presence of auxiliary contacts if you fit them later. Mechanical durability is 20 000 cycles, electrical durability 20 000 cycles at rated current and 10 000 cycles at 2× In — both adequate for a distribution breaker that opens infrequently (not a switching device for motor starts).