Integrator's terse spec recap
The Siemens 5SL3150-7 is a 1-pole SENTRON miniature circuit breaker with a C-curve tripping characteristic, rated 50 A at 400 V AC. Breaking capacity is 4.5 kA per both EN 60898 and IEC 60947-2 — that's the fault current it can safely interrupt without welding contacts or cascading upstream. Single-module width (18 mm) on the DIN rail; any mounting position works. Terminal accepts 0.75 to 25 mm² solid or stranded, torqued to 2.5–3 N·m.
What the ratings mean for fit
The C-curve means the magnetic trip activates at 5–10× rated current — standard for lighting panels, small motor circuits, and general distribution where moderate inrush is expected. At 50 A, this is a main or feeder breaker for a sub-panel, not a final subcircuit. The 4.5 kA SCCR is typical for residential and light commercial panels; if the available fault current at the installation point exceeds 4.5 kA, you need an upstream current-limiting device or a higher-rated breaker. Rated voltage of 400 V AC covers 3-phase line-to-line in most European TN systems; maximum operating voltage with multi-phase operation is 440 V. Ambient temperature range of -25 to +45 °C with storage down to -40 °C — derate if the panel interior runs hot.
Panel integration notes
Snap-on DIN rail mount, 18 mm wide (1 module). IP20 with connected conductors — protected against finger contact but not washdown; keep inside an enclosed panel. Sealable for lockout/tagout compliance. Halogen-free and silicon-free — suitable for environments sensitive to outgassing, like clean rooms or sealed enclosures.