The Siemens SENTRON 5SY6280-7CC is a 2-pole miniature circuit breaker with a C tripping characteristic, rated 80 A and a breaking capacity of 6 kA per IEC 60947-2 at 400 V AC.
For a panel fed from a transformer or a distribution board with a prospective fault current up to 6 kA, this MCB clears the fault without external fusing. The C-curve (5–10× In) is sized for moderate inrush loads — motor starters, small transformers, banks of LED drivers — where the magnetic trip must not nuisance-trip on startup. The 80 A rating on a 2-pole format suits larger subfeeds or high-current single-phase loads.