What this MCB does on the rail
The Siemens 5SL4415-7 is a 4-pole miniature circuit breaker from the SENTRON 5SL4 series, rated 1.6 A with a C tripping characteristic. It clears faults up to 10 kA per both EN 60898 and IEC 60947-2, which means it handles typical residential and light commercial short-circuit levels without needing an upstream current-limiting device. The 400 V AC rating covers standard three-phase panel feeds; the 440 V maximum on multi-phase operation gives a little headroom for lightly loaded transformers or long feeders.
Panel fit and wiring
Occupies 4 width units (72 mm) on a DIN rail, with a depth of 76 mm and 70 mm installation depth behind the panel. The screw terminals accept solid or stranded conductors from 0.75 to 25 mm², torqued to 2.5–3 N·m. Mounting position is any orientation, which simplifies layout in crowded enclosures. IP20 with connected conductors — standard for dry indoor panels, not for washdown zones.
What the C-curve and ratings mean for your load
The C-curve trips at 5–10 times rated current, so the 1.6 A breaker holds through motor inrush or capacitive loads up to about 16 A before opening. That makes it a fit for general-purpose branch circuits feeding small motors, contactor coils, or lighting banks — not for purely resistive loads where a B-curve would be tighter. The 10 kA SCCR at 400 V means it safely interrupts faults up to that level without cascading upstream; the energy limiting class 3 keeps let-through energy low enough to protect downstream wiring.