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. It occupies 2 modular width units (36 mm) on a DIN rail, making it a standard panel-building component for branch-circuit protection in industrial control cabinets.
Ratings and what they mean for fit
The 6 kA breaking capacity at 400 V AC per IEC 60947-2 is the short-circuit current the breaker can safely interrupt. 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. The 5.6 W power loss per pole at rated current in hot state matters for thermal management inside a sealed enclosure; adjacent devices should be derated per the manufacturer's grouping rules.
Deployment context
Rated for mechanical engineering and industry applications per the specification, this MCB mounts in any position on a DIN rail via the quick-assembly system. The IP20 rating (with connected conductors) is standard for dry indoor panels; the pollution degree 3 and overvoltage category III ratings confirm it is designed for fixed installations inside an enclosure where transient overvoltages from the mains are expected.