The Siemens SENTRON 5SL4450-7RC is a 4-pole miniature circuit breaker with a C-tripping characteristic, rated at 50 A and 415 V AC, with a 10 kA breaking capacity according to EN 60898. It's a current-production part from the SENTRON family, designed for residential and infrastructure branch-circuit protection.
What the ratings mean for fit
The 10 kA breaking capacity at 415 V AC per EN 60898 means this MCB can safely interrupt a fault current up to 10,000 A without welding its contacts or rupturing the case — that's the standard for most residential and light commercial distribution boards in IEC markets. The C-curve trips between 5 and 10 times rated current, so it's the right choice for circuits with moderate inrush, like groups of fluorescent lighting or small motor loads; a B-curve would nuisance-trip on the same startup surge, and a D-curve would let a fault ride through too long. At 4.5 W power loss per pole in hot operating state, four poles dissipate 18 W total inside the enclosure. In a crowded DIN-rail panel with limited airflow, that heat adds up — derating the adjacent breakers or leaving a slot's worth of ventilation gap is standard practice.
Panel integration and mounting
Snap-on mounting to DIN rail, any position. At 18 mm width — one modular unit — this 4-pole breaker occupies four consecutive 18 mm slots. Installation depth is 70 mm, total depth 76 mm. The IP20 rating means it's protected against finger contact but not water ingress; it belongs inside a distribution board or enclosure, not exposed to washdown. Sealable, halogen-free and silicon-free. Accepts supplementary devices — shunt trip, auxiliary contacts, under-voltage release — for remote tripping or status feedback.