What it is and what it does
The Siemens 5SL4663-6 is a SENTRON miniature circuit breaker (MCB) rated 63 A with a B tripping characteristic, 3P+N poles, and a 400 V AC supply voltage. It interrupts fault currents up to 10 kA per both EN 60898 and IEC 60947-2 — that is the SCCR the breaker can clear without welding or failing, which governs its use in residential and infrastructure panels where the prospective fault current stays under that threshold.
What the ratings mean for fit
The B-curve trips between 3 and 5 times rated current (189–315 A for this 63 A unit), making it a fit for resistive or lightly inductive loads where inrush is low — lighting, heating, general socket circuits. The 3P+N pole configuration switches all three phases and the neutral, with the neutral pole switching but not protecting; the 4-module width (72 mm) occupies four DIN-rail positions. Depth of 76 mm and installation depth of 70 mm clear standard 80 mm-deep enclosures, and the IP20 rating (with connected conductors) is typical for enclosed distribution boards. The 10 kA breaking capacity at 400 V AC is the same under both EN 60898 (domestic standard) and IEC 60947-2 (industrial standard), so the part carries a single rating that satisfies both code families — no derating needed when the installation is governed by one versus the other. Overvoltage category III and pollution degree 2 confirm it is rated for fixed-installation mains distribution, not for downstream equipment-level protection.
Panel integration and compliance
Mounts in any position on standard DIN rail. The sealable design allows the installer to lock the toggle position after commissioning — useful for tamper-proofing in public-access enclosures. Supplementary devices (shunt trips, auxiliary contacts, alarm switches) can be snapped onto the right side without increasing the pole width. Halogen-free and silicon-free construction meets the material restrictions common in rail, marine, and clean-room specifications.