The 5SL4408-8CC: The 10 kA breaking capacity at 400 V means this MCB can safely interrupt fault currents up to 10,000 amps without welding its contacts or cascading damage upstream — critical for panel SCCR compliance under IEC 60947-2. The D-curve (10–20× In magnetic trip) is sized for high-inrush loads like motor starters, transformers, or discharge lighting; it won't nuisance-trip on the starting surge of a small motor or a control transformer bank.
Snap-on DIN-rail mount for standard 35 mm rail. The 4-pole width (72 mm, 4 modules) fits standard distribution boards. Rated for 400 V phase-to-phase, so it works in 230/400 V TN and TT systems common across Europe and Asia. No special derating needed for 50/60 Hz — the breaking capacity holds at both frequencies.