What this part is and what the ratings mean
The Siemens 5SU1356-0DV10 is an FI/LS protector — a combined residual-current device (RCD) and miniature circuit breaker (MCB) in one 1+N-pole unit. Type AC detection means it trips on sinusoidal AC residual currents only; the 30 mA sensitivity is the standard for personal shock protection in final circuits. The 6 kA breaking capacity (Icn) at the rated voltage tells you it can safely interrupt a short-circuit fault up to that level without welding contacts or cascading damage upstream. B-curve 10 A means the magnetic trip releases at 3 to 5 times rated current (30–50 A), sized for resistive and general-purpose loads — lighting, small appliances, control transformers — where inrush is modest.
Deployment context
This is a DIN-rail mounted unit for distribution boards and sub-distribution panels. The pigtail neutral connection (N-pole switched) suits it for single-phase final circuits where the neutral is distributed. The 70 mm depth (D=70MM) fits standard shallow enclosures, but watch the gland plate clearance if you're packing multiple units in a row — the pigtail adds a few extra millimeters behind the rail.