What it is and what it does
The Siemens 5SL6132-6YA is a SENTRON miniature circuit breaker, 1-pole, B-curve, rated 32 A at 230/400 V AC with a 6 kA breaking capacity per EN 60898. It's the sort of part you grab for general-purpose branch circuit protection in residential or light commercial panels — one modular width (18 mm) on the DIN rail, so it fits tight enclosures without eating space.
What the ratings mean on the van
The B-curve means it trips magnetically between 3 and 5 times rated current (so 96–160 A for this 32 A unit). That's your go-to for resistive loads and general wiring where you don't expect big inrush — lighting circuits, socket outlets, small heaters. The 6 kA breaking capacity (per EN 60898) tells you it can safely interrupt a fault current up to 6,000 A at 400 V; fine for most domestic and light commercial service entrances where the prospective short-circuit current stays under that. Rated 32 A at 30 °C ambient, but if the panel is running hot — say 45 °C — it derates to 28.8 A. The 40 °C figure (0.93 A) looks like a data anomaly; in practice, use the 45 °C derate as your real-world limit when the enclosure is packed. Mechanical life is 10,000 cycles typical, which is fine for a distribution board that sees maybe a few operations a year. IP20 with a distribution board cover — that's expected for a DIN-rail MCB inside a closed panel. Not for wet or dusty environments without an enclosure.
Panel fit and mounting
Snaps onto standard 35 mm DIN rail. One modular width (18 mm) — 1 MW. Depth is 76 mm (70 mm installation depth behind the rail). Mounting position is any, so you can lay it sideways in a shallow enclosure if needed. Sealable, halogen-free, silicon-free — relevant if your spec calls for low-corrosion materials in a clean-room or marine panel.