Ratings and fit for the panel
The 5SL4350-6CC is a 3-pole miniature circuit breaker rated at 50 A with a B tripping characteristic, operating at 400 V with a 10 kA breaking capacity. The B curve means it trips at 3–5 times rated current, making it a good fit for resistive and general-purpose loads where inrush is moderate — think lighting banks, distribution subfeeds, or control transformers. The 10 kA interrupting rating at 400 V is the standard domestic and light-commercial fault level; it handles a hard short without welding contacts or cascading upstream.