The Siemens SENTRON 5SL4208-7CC is a 2-pole miniature circuit breaker rated 8 A with a C tripping characteristic and a 10 kA breaking capacity per EN 60898 at 400 V AC. It occupies 2 modular width units (36 mm) on a DIN rail, with a depth of 76 mm and height of 90 mm. The C-curve means it trips between 5 and 10 times rated current — standard for general-purpose branch-circuit protection in residential and light commercial panels where moderate inrush from motor starters or capacitor banks might otherwise nuisance-trip a B-curve device.
Breaking capacity and coordination
The 10 kA rated short-circuit capacity at 400 V AC (per EN 60898) is the figure that governs selectivity in a residential or infrastructure distribution board. At this level the breaker safely interrupts a fault up to 10 kA without welding its contacts or cascading upstream — provided the upstream device (main breaker or fuse) is coordinated per the manufacturer's selectivity tables. The 2-pole design switches both phase conductors simultaneously, so it suits single-phase 230 V line-to-neutral circuits as well as two-phase 400 V line-to-line loads. Rated for overvoltage category III and pollution degree 2, the 5SL4208-7CC is specified for fixed installations inside a distribution enclosure where transient overvoltages (e.g., from utility switching) are within category III limits. The IP20 rating with connected conductors means the breaker itself is finger-safe only when wired into a closed panel — it is not intended for exposed or wet locations.
Mounting and integration
Snap-on mounting to 35 mm DIN rail per EN 60715. The 36 mm width (2 MW) and 70 mm installation depth leave room for adjacent devices in a crowded distribution board. Mounting position is unrestricted — the breaker operates correctly in any orientation. The sealable design allows the installer to lock the toggle position with a lead seal or padlock, preventing unauthorized reset after a trip.
Environmental and compliance
Rated for ambient temperatures from -40 °C to 75 °C, the 5SL4208-7CC covers cold storage and rooftop enclosure installations. Halogen-free and silicon-free construction avoids corrosive outgassing in sensitive environments (e.g., data centers, medical facilities). Vibration resistance to 50 m/s² at 25–150 Hz per IEC 60068-2-6 means it holds up on machinery or in transport applications.