The Siemens 5SJ4113-7HG42 is a SENTRON 5SJ4 miniature circuit breaker — 1-pole, C-curve, rated 10 kA breaking capacity per EN 60898 and 15 kA per IEC 60947-2 at 400 V AC. That 15 kA IEC rating is the one that governs industrial panel coordination: it tells you this MCB can clear a fault up to 15 kA without welding its contacts or venting arc gas into the enclosure, which matters when you're sizing the upstream backup fuse or breaker.
What the ratings mean for fit
C-curve trips between 5× and 10× In — standard for motor-starting and moderate inductive loads where you need inrush headroom without nuisance tripping. At 18 mm width (1 modular unit), it snaps onto standard DIN rail and occupies one slot in any SENTRON distribution board or industrial panel. Pollution degree 3 and overvoltage category 3 mean it's rated for the conductive-dust and transient environment you get in a real factory panel, not just a clean residential loadcenter.