The Siemens SENTRON 5SL3250-7 is a 2-pole miniature circuit breaker rated 50 A at 400 V AC, with a C tripping characteristic and a 4.5 kA breaking capacity per EN 60898.
Panel fit and wiring constraints
Terminal torque spec is 2.5–3 N·m, and the terminals accept solid or stranded copper from 0.75 mm² up to 25 mm², so you can land a 6 mm² feeder or a 16 mm² submain without adapters.
