The Siemens 5SL6563-7BB is a SENTRON 5SL6 miniature circuit breaker (MCB) with two poles configured as 1P+N — it switches both the phase and the neutral, with the neutral pole switching but not protecting. Rated 63 A at 230 V AC with a C tripping characteristic, it interrupts overcurrents and short-circuits up to 6 kA per EN 60898 and IEC 60947-2. That 6 kA rating means it can safely clear a fault up to that level without welding its contacts or cascading damage upstream — standard for residential and light commercial distribution boards where the prospective short-circuit current stays under 6 kA.
What the ratings mean for fit
The C-curve (tripping characteristic C) means the magnetic trip activates at 5 to 10 times rated current — so for a 63 A MCB, the instantaneous trip threshold sits between 315 A and 630 A. That suits loads with moderate inrush, like lighting banks, small motor circuits, and general-purpose socket outlets. If your load has high inrush (transformers, large motors), you would step up to a D-curve; for resistive-only loads, a B-curve would trip faster on minor surges. The 6 kA breaking capacity is the same under both EN 60898 (household) and IEC 60947-2 (industrial) standards, so it qualifies for either classification — no derating needed when moving between residential and light industrial panels. The 1P+N pole configuration means the neutral is switched but not monitored for overcurrent — the thermal-magnetic protection lives only on the phase pole. That is standard for single-phase final circuits where the neutral is bonded at the transformer; if you need full protection on both poles (for a two-phase load or an IT system), you would need a 2P MCB instead. The neutral conductor switching feature is explicitly listed, so the neutral pole opens and closes with the phase — useful for isolation during maintenance. Terminals accept solid or stranded conductors from 0.75 mm² up to 25 mm², with a tightening torque of 2.5 to 3 N·m. That 25 mm² upper end is generous for a 63 A breaker — it lets you land the incoming feed with a 4 mm² or 6 mm² cable and still have headroom for parallel feeds if needed. The IP20 rating is typical for DIN-rail components inside an enclosed panel; it provides finger-safe touch protection on the front, but the terminals are only protected when conductors are connected.
Panel integration and mounting
Snap-on mounting to 35 mm DIN rail (standard for the 5SL6 series). The housing is 36 mm wide (2 width units at 18 mm each), 90 mm tall, and 76 mm deep. Installation depth is 70 mm, so it fits standard distribution boards with 80 mm or deeper enclosures. Mounting position is any — no derating needed for horizontal or upside-down orientation. The sealable feature allows a lead seal or lockout tag to be fitted through the toggle, meeting isolation lockout requirements for maintenance.