The Siemens 5SL4450-6CC is a SENTRON 5SL miniature circuit breaker, 4-pole (4P), rated 50 A at AC with a B tripping characteristic. It breaks fault currents up to 10 kA per EN 60898 at 400 V AC — the standard for residential and light commercial distribution panels. The B-curve trips between 3 and 5 times rated current, so it's sized for lighting and general-purpose socket circuits where inrush is modest. Mounts on DIN rail, any position, and occupies 4 width units (72 mm).
What the ratings mean for fit
50 A at 400 V AC is the continuous current per phase — this breaker protects a 50 A feeder or submain. The 10 kA breaking capacity (Icn) per EN 60898 means it can safely interrupt a short-circuit fault up to 10,000 A at the rated voltage; that covers most residential and light commercial service entrances where the prospective fault current stays under that threshold. The B-curve (3–5× In) avoids nuisance trips on lighting or resistive loads but will trip faster than a C-curve on moderate inrush. Terminal capacity accepts solid or stranded conductors from 0.75 to 25 mm², with a tightening torque of 2.5 to 3 N·m — enough for 25 mm² tails on a 50 A feed.
Deployment context
Snaps onto DIN rail in any mounting position — panel builders can orient it vertically or horizontally without derating. The IP20 rating (with connected conductors) is standard for enclosed distribution boards; not rated for washdown or outdoor exposure. Ambient temperature range -25 to +55 °C operating, with storage from -40 to +75 °C. Halogen-free and silicon-free construction suits environments where outgassing must be minimized (data centers, clean manufacturing).