It combines a 30 mA residual current device (RCD) with a Type B MCB in a single 18 mm wide module — one modular width unit. That means it fits a standard DIN-rail enclosure and takes up the same slot as a single-pole MCB, which matters when panel space is tight and you need both earth-leakage and overcurrent protection on a final subcircuit. Rated 16 A at 30 °C ambient, it derates to 12.8 A at 70 °C — the full thermal curve is listed, so you can size it for the actual cabinet temperature without guessing. The tripping characteristic is B (3-5 In), the standard for general-purpose socket circuits and lighting in residential and commercial panels where inrush is modest.
If you're looking at a panel originally built around the 5SY4116-7CV (a Siemens MCB-only, no RCD), the 5SV1316-0KK16 won't drop in without rewiring — the RCBO adds the residual-current module and requires the neutral connection that a plain MCB doesn't. But if the spec calls for combined protection in one module width, this is the direct fit.
Mounts in any position on DIN rail. Depth is 77 mm overall, installation depth 70 mm — that 7 mm difference is the front projection of the toggle and test button. IP20 with connected conductors in an installed distribution board, so it's for enclosed panels, not open washdown areas. The 4 kV surge voltage rating (impulse withstand) aligns with overvoltage category III for fixed installations.