63 A D-curve MCB for high-inrush loads
The Siemens 5SL4163-8 is a SENTRON 5SL4 miniature circuit breaker rated 63 A with a D tripping characteristic, meaning it tolerates the high inrush currents typical of motor starters, transformers, and welding equipment without nuisance tripping — the magnetic trip operates at 10–20× rated current, so it passes the start-up spike and clears only a sustained overload or hard short. Single-pole (1P) construction, rated 400 V AC phase-to-neutral, with a maximum of 440 V for multi-phase operation — sized for a single-phase branch circuit or one leg of a three-phase panel.
Screw terminals accept solid or stranded copper from 0.75 mm² up to 25 mm², with a tightening torque of 2.5–3 N·m — enough for the 16–25 mm² tails a 63 A circuit usually needs.
Same part, different passport: this genuine Siemens MCB moves through independent cross-border channels. Genuine is genuine — the warranty geofencing is a manufacturer policy, not a quality difference.