The K curve is the key spec here — it's designed for motor and transformer circuits where inrush current can be several times the rated load, so it holds through the start-up spike without nuisance tripping on a pump or conveyor drive.
Snap-on DIN rail mount, standard 2-pole width (36 mm). The K characteristic means the magnetic trip threshold is roughly 8–12× In, so for a 32 A breaker the instantaneous trip point sits between 256 A and 384 A — wide enough to pass the inrush of a 7.5 kW motor direct-on-line but still fast enough to clear a bolted fault. Panel builders should verify the upstream selectivity with the 15 kA rating; it coordinates cleanly with a 63 A SENTRON NH fuse or a SIRIUS 3RV motor-protective breaker in the same distribution board.