What it is and what it does
The Siemens SENTRON 5SL6313-7CC is a 3-pole miniature circuit breaker (MCB) with a C-curve tripping characteristic, rated 13 A at 400 V AC. Its 6 kA breaking capacity per EN 60898 covers residential and light commercial infrastructure branch circuits — think distribution boards feeding lighting, general-purpose sockets, or small HVAC units. The C-curve means it holds through mild inrush (5–10× rated current) and trips fast on hard shorts, so it's the standard choice for mixed resistive-inductive loads where you don't want nuisance trips from transformer or motor starts.
Ratings that matter for fit
At 54 mm wide (3 modular width units), it occupies three standard 18 mm DIN-rail slots — a common footprint for 3-pole MCBs in a Siemens SENTRON sub-distribution board. The 76 mm depth plus 70 mm installation depth means it clears most enclosure backplates without forcing a deeper can. Mounting position is unrestricted, so you can orient it vertically or horizontally in a tight gland-plate layout. The 6 kA breaking capacity at 400 V AC per EN 60898 is the standard domestic/infrastructure rating. If your fault loop impedance at the board is higher than 0.067 Ω (400 V / 6 kA), this breaker clears the fault within its rated limit. For industrial panels with higher prospective fault current, you'd step up to the 10 kA variant (5SL4363-7). Power loss is 2.3 W per pole in hot operating state at rated current — 6.9 W total for the 3-pole assembly. That's low enough to ignore derating in a standard 12-module enclosure, but worth checking if you're packing 24+ breakers in a sealed box. Rated for overvoltage category III (distribution board level) and pollution degree 2 (non-conductive dust, occasional condensation). IP20 with connected conductors — fine inside a closed panel, not for wet or outdoor exposure without an enclosure.