What this 5SL6315-8CC is and what the ratings mean for fit
The Siemens 5SL6315-8CC is a SENTRON miniature circuit breaker (MCB) from the 5SL series, designed for residential and infrastructure branch-circuit protection. It is a 3-pole unit rated 1.6 A at 400 V AC with a D tripping characteristic and a 6 kA breaking capacity per EN 60898. The D-curve means this breaker is sized for loads with high inrush current — typically motor starters, small transformers, or discharge lighting — where the magnetic trip threshold is 10 to 20 times the rated current. At 1.6 A, the magnetic release will hold through a starting surge up to roughly 16–32 A before clearing a hard fault. The 6 kA breaking capacity (per EN 60898) tells you it can safely interrupt a fault current up to 6 kA at 400 V AC without welding contacts or cascading failure upstream. That is the standard domestic and light-commercial SCCR level for this class; if your available fault current exceeds 6 kA, you need a current-limiting upstream device or a higher-rated breaker. Three poles (3P) with no switched neutral — the neutral conductor passes through unswitched, which is standard for TN and TT systems where the neutral is bonded at the source. The 3 width units (54 mm) on DIN rail are what you plan for in the enclosure layout.
Mounting and wiring constraints
Mounts on 35 mm DIN rail in any position. The 76 mm depth and 70 mm installation depth fit standard distribution boards; verify door clearance if using a deep enclosure lid. Terminals accept solid or stranded copper from 0.75 mm² up to 25 mm². Tightening torque is 2.5 to 3 N·m — a standard screwdriver bit, no special tooling. The IP20 rating applies with conductors connected; the enclosure must provide the overall panel IP rating. Sealable design (provision for a lead seal or lockout tag) is present, which matters for installations requiring tamper evidence per local utility or safety rules.