The Siemens 5SL6663-7CC is a SENTRON miniature circuit breaker rated 63 A with a C-curve tripping characteristic, in a 3P+N (4-pole) configuration. It is designed for 400 V AC systems and carries a 6 kA breaking capacity according to EN 60898 — the standard that governs overcurrent protection in residential and commercial final circuits.
This breaker occupies 4 modular width units (72 mm) on a DIN rail, with a depth of 76 mm and height of 90 mm. The installation depth behind the panel is 70 mm.
The 6 kA breaking capacity at 400 V AC per EN 60898 is the standard rating for this class — it safely interrupts fault currents up to that level in a residential or light-commercial distribution board. The C-curve is the most common choice for general-purpose circuits feeding socket outlets, lighting, and small motor loads.