The Siemens 5SL6406-7 is a SENTRON miniature circuit breaker (MCB) — a 4-pole, C-curve unit rated for 6 A at 400 V AC, with a 6 kA breaking capacity certified to both EN 60898 and IEC 60947-2. It is designed for residential and infrastructure panelboards where overcurrent and short-circuit protection of branch circuits is needed.
Rated 6 A at 400 V AC means this breaker protects a circuit drawing up to 6 A continuous without nuisance tripping, and the 4-pole (4P) construction switches all three phases plus neutral. The C-curve is the deciding factor for fit: if your load has a high inrush (motors, pumps, transformers) a B-curve might nuisance-trip, while a D-curve would let through more fault energy before opening. C-curve is the standard middle ground for general-purpose branch circuits. Mechanical endurance rated at 10,000 switching cycles typical.
Snaps onto standard DIN rail.