What it is and what it does
The Siemens 5SL4550-6CC is a 1+N-pole miniature circuit breaker rated 230 V with a 10 kA breaking capacity and a B tripping characteristic at 50 A. The B curve means it trips between 3 and 5 times rated current — standard for resistive and general-purpose loads where inrush isn't a concern. It protects a single phase plus neutral in a compact DIN-rail footprint, sized for distribution boards and sub-panels where you need coordinated overcurrent and short-circuit protection on lighting, socket circuits, or small equipment.