The Siemens 5SL4208-6 is a SENTRON 5SL4 miniature circuit breaker — 2-pole, B-curve, rated 8 A at 400 V AC with a 10 kA breaking capacity certified to both EN 60898 and IEC 60947-2. That 10 kA SCCR means it can safely interrupt fault currents up to that level in a residential or light commercial distribution board without cascading upstream. The B characteristic trips between 3–5× rated current, so it's sized for resistive and general-purpose loads where inrush is modest — lighting circuits, socket outlets, control transformers — not motor starting.
Integration and mounting
Snaps onto standard DIN rail — 36 mm wide (2 width units), 90 mm tall, 76 mm deep with a 70 mm installation depth. Mounting position is unrestricted, which helps when the panel layout is tight. IP20 with connected conductors, so it's meant for enclosed distribution boards, not wet environments. Rated for overvoltage category III and pollution degree 2, which is the standard for fixed-installation switchgear in residential and commercial buildings. Touch protection is built in, and the enclosure is sealable — useful for panel builders who need to lock out tampering after commissioning.
Environmental and compliance notes
Halogen-free and silicon-free construction, which matters for panels in environments sensitive to corrosive off-gassing (data centers, medical facilities). Rated for ambient temperatures from -40 °C to +75 °C, with a derating note at +55 °C and 95% humidity. Mechanical endurance is 10,000 switching cycles typical.