What this 13 A B-curve MCB does on the rail
The Siemens 5SL4113-6 is a 1-pole miniature circuit breaker from the SENTRON family, rated 13 A at 30 °C with a B tripping characteristic and a 10 kA breaking capacity tested to EN 60898. At 40 °C the continuous rating derates to 12.01 A, and at 55 °C it drops to 10.35 A — so if the panel runs hot, size up one step or account for the thermal curve. It occupies a single modular width (18 mm) on the DIN rail, installs in any mounting position, and has an IP20 rating with conductors connected — standard for enclosed distribution boards.
The 10 kA rated short-circuit capacity per EN 60898 (also 10 kA per IEC 60947-2) tells you this breaker can safely interrupt fault currents up to that level at 400 V AC without welding its contacts or failing catastrophically. The single-pole rating covers 250 V AC phase-to-neutral; multi-phase operation goes to 440 V AC. DC rating is 72 V maximum — usable for DC sub-circuits but not for 110 V DC battery banks.