SENTRON 5SN4316-7CN — 16 A C-curve MCB, 3-pole, 400 V
The Siemens SENTRON 5SN4316-7CN is a 3-pole miniature circuit breaker with C-curve tripping characteristic, rated 16 A at 400 V AC and 10 kA breaking capacity per EN 60898. It occupies 3 modular width units (54 mm) on the DIN rail and is sealable, halogen-free, and silicon-free — suited for panels requiring clean-room or food-grade material restrictions. The C-curve trips between 5× and 10× rated current, so it handles motor inrush and transformer energization without nuisance opening on typical branch circuits. Rated for overvoltage category III and pollution degree 2, the 5SN4316-7CN fits distribution panels in residential, commercial, and industrial infrastructure. The 10 kA SCCR at 400 V matches the typical fault level at the service entrance or sub-distribution board; upstream coordination with a higher-rated main breaker or fuse is the standard selectivity practice.
Thermal derating and ambient range
Rated 16 A at 30 °C ambient, the 5SN4316-7CN derates to 15.15 A at 40 °C, 14.71 A at 45 °C, 14.26 A at 50 °C, and 13.79 A at 55 °C. In a sealed enclosure or near heat-generating equipment, the 40 °C figure governs the practical load — a 15 A continuous load is the safe limit in a 40 °C panel. The operating range spans -40 °C to 75 °C, covering outdoor cabinets in cold climates and hot attic or rooftop installations.
Mounting and integration
Snap-on DIN rail mount, any position. Installation depth 70 mm, overall depth 76 mm — the extra 6 mm accounts for the terminal screws and wire bend radius. IP20 with connected conductors, so it belongs inside a closed panel, not exposed to washdown. Vibration resistance to 50 m/s² at 25–150 Hz per IEC 60068-2-6, adequate for machine-mounted sub-panels on conveyors or compressors.