The Siemens SENTRON 5SL4463-6 is a 4-pole miniature circuit breaker (MCB) with a B tripping characteristic, rated 63 A at 400 V AC, and a breaking capacity of 10 kA per EN 60898 and IEC 60947-2. It occupies 4 modular width units (72 mm) on a DIN rail and is designed for residential and infrastructure branch-circuit protection.
Ratings and what they mean for fit
The B-curve trips between 3 and 5 times rated current — the standard choice for resistive and general-purpose loads where inrush is moderate. At 63 A, this MCB handles a 63 A continuous load at 30 °C ambient. Above that, you must derate: 59.67 A at 40 °C, 57.96 A at 45 °C, and 54.29 A at 55 °C. The 10 kA breaking capacity at 400 V AC means it can safely interrupt a fault current up to 10,000 A without upstream devices needing to clear it — sufficient for most service-entrance and sub-distribution panels where the prospective short-circuit current is under that threshold. The 4-pole design switches all three phases plus neutral, making it suitable for 3-phase + N circuits. The 400 V AC rated voltage and 440 V maximum with multi-phase operation cover standard 230/400 V TN and TT systems across 50/60 Hz networks.
Panel integration and mounting
Mounts on a DIN rail in any position. The 72 mm width (4 MW units) and 76 mm depth fit standard distribution boards; the 70 mm installation depth accounts for the rail clip and wiring clearance. Rated IP20 with connected conductors — suitable for enclosed panels, not for wet or dusty environments. Sealable, halogen-free, and silicon-free construction supports use in clean-room or low-outgassing applications.