It protects a single-phase 230 V AC final circuit against arc faults, earth leakage (30 mA, Type A), and overload/short-circuit (B-curve, 16 A).
The B-curve means the magnetic trip operates at 3–5× In (48–80 A for this 16 A unit), so it's the right choice for resistive and general-purpose loads with low inrush — lighting, socket outlets, small appliances. For motor or transformer circuits with higher inrush, a C-curve sibling would be needed.
The 68.5 mm depth plus 70 mm installation depth means it clears most enclosure doors with a 70 mm minimum internal depth. The pigtail neutral conductor requires connection to the neutral busbar — not a plug-in neutral bar.