What ships in the carton
The Siemens SENTRON 5SY4480-7CC is a 4-pole miniature circuit breaker (MCB) with C-curve tripping characteristic, rated 80 A at 400 V AC. It carries a 10 kA breaking capacity per IEC 60947-2 — enough for most commercial and light industrial distribution boards where the prospective fault current stays under that threshold. The C-curve (5–10× In) handles motor inrush and moderate transformer loads without nuisance tripping, while still clearing fast on hard faults. The unit occupies 4 modular width units (72 mm wide) on a DIN rail, with a depth of 76 mm and height of 90 mm. It mounts in any position — no derating needed for horizontal or inverted orientation. The IP20 rating (with connected conductors) means it belongs inside a closed panel, not exposed to washdown or dust.
Key ratings and what they mean for fit
The 10 kA breaking capacity at 400 V AC (per IEC 60947-2) is the fault-clearing rating that governs selectivity in a distribution board. Below that fault level, the breaker clears without upstream devices needing to trip — useful for coordinating a sub-panel fed from a larger MCCB. Under UL 1077 and CSA C22.2 No. 235, the rating drops to 5 kA, so verify the applicable standard for your jurisdiction. Power loss per pole is 5.6 W at rated current in hot operating state — 22.4 W total across four poles. This matters for thermal budgeting inside a sealed enclosure; adjacent devices should be derated if the panel ambient exceeds 40 °C. The breaker is rated for ambient temperatures from -40 °C to 75 °C, with humidity derating above 55 °C. Mechanical service life is 10 000 operating cycles typical — sufficient for routine switching in a distribution role, but not designed for frequent motor starting duty where a contactor handles the cycling. The breaker accepts supplementary devices (auxiliary contacts, shunt trips, undervoltage releases) via the product extension interface.
Panel integration checklist
Snap-on mounting to DIN rail via the quick assembly system. Combined terminal at both top and bottom accepts busbar or cable. Installation depth is 70 mm, leaving 6 mm clearance behind the 76 mm overall depth for wiring. Sealable — the toggle can be locked in the OFF position for LOTO compliance. Halogen-free and silicon-free construction, suitable for clean-room or food-processing environments where outgassing is restricted.