EN 60898 is the residential/commercial standard for MCBs, so this part is sized for distribution boards and sub-panels, not high-fault industrial mains. Three poles (3P) with no switched neutral — it breaks all three phases but leaves the neutral through. The 55 mm depth and 3 width units fit a standard DIN rail.
Snap-on DIN rail mount, 3 module widths. The 55 mm installation depth leaves clearance in a standard enclosure. Overvoltage category 3 and energy limiting class 3 indicate it's designed for fixed-installation distribution boards.