It carries a 42 kA Icu at 12-60 VAC (EN/IEC 60947-2) and 10 kA Icn at 230 VAC (EN/IEC 60898-1), so it's built to handle high fault currents on a lighting or motor branch without upstream coordination headaches. The D-curve magnetic trip at 12× In (±20 %) means it tolerates the inrush of small motors or transformers — you won't get nuisance trips on start-up.
Snaps onto a standard DIN rail — 18 mm width (2×9 mm pitches), 91 mm tall, 78.5 mm deep. IP20 rated, so it lives inside an enclosure, not out in the weather.
