The Siemens SENTRON 5SN4350-7CN is a 3-pole miniature circuit breaker with a C tripping characteristic, rated 50 A and 400 V AC. Its 10 kA breaking capacity per EN 60898 covers the majority of commercial and light industrial panel applications where fault levels stay under that threshold. The C-curve means it tolerates moderate inrush — think motor starters, banks of LED drivers, or small transformer primaries — without nuisance tripping, while still clearing fast on a hard short.
Fit and panel integration
At 54 mm wide (3 modular width units) and 76 mm deep, it occupies standard DIN-rail space. The 70 mm installation depth leaves room behind a 100 mm deep enclosure for wiring. Solid conductors up to 25 mm² land on the terminals — enough for a 50 A feed on a sub-main or feeder breaker. Mounting position is unrestricted, so it works in vertical or horizontal panel layouts without derating the thermal trip. IP20 with connected conductors means it's intended for enclosed panels only — no exposed installation. The sealable design lets a panel builder or inspector lock the breaker in the OFF position for lockout/tagout compliance.
Environmental range and materials
Rated for ambient temperatures from -40 °C to +75 °C, with a derating influence noted at +55 °C and 95% humidity. Halogen-free and silicon-free construction matters for installations in clean rooms, semiconductor fabs, or areas where outgassing can't contaminate optics or contacts.