The Siemens 5SY6580-7CC is a SENTRON miniature circuit breaker (MCB) from the 5SY6CC design family, rated at 80 A with a C tripping characteristic. It is a 2-pole unit (1P+N) that switches the line and switches the neutral, rated for 230 V AC at 50/60 Hz. The breaking capacity is 6 kA per IEC 60947-2, which covers most industrial branch-circuit fault levels up to that threshold without needing an upstream current-limiting device.
What the ratings mean for fit
The 80 A rating is the continuous current the breaker carries without tripping in a 40 °C ambient. The C-curve (magnetic trip between 5× and 10× In) means it handles moderate inrush from motor starters or transformer banks without nuisance trips, while still clearing hard faults. The 6 kA SCCR at 230 V AC is the maximum prospective fault current the breaker can safely interrupt — if your panel's available fault current exceeds that, you need a current-limiting upstream device or a higher-rated breaker. Terminals accept solid or stranded conductors from 0.75 mm² up to 35 mm², with a tightening torque range of 2.5 to 3.5 N·m. The combined top and bottom terminals (box lug style) accept the full wire range at both ends, so you can feed-through or loop without extra terminals. The breaker is IP20 with connected conductors — protected against finger contact but not against moisture. It mounts on a DIN rail via the quick-assembly system, occupies 2 width units (36 mm), and can be installed in any position. Depth is 76 mm, installation depth 70 mm.
Where it is used
This MCB is designed for mechanical engineering and industrial panel applications — think machine control cabinets, conveyor distribution boards, or HVAC branch circuits. The C-curve suits mixed resistive and moderate inductive loads. The neutral-switching function (1P+N) is common in single-phase sub-distribution where you want to isolate both poles for maintenance. The operating ambient range is -25 °C to +55 °C, with storage from -40 °C to +75 °C. Humidity tolerance is derated above 55 °C: max 95% RH at 55 °C, dropping to 35% at 75 °C. That covers most indoor industrial environments but not sealed washdown zones.