The Siemens 5SL6308-8CC is a 3-pole miniature circuit breaker (MCB) rated 400 V with a 6 kA breaking capacity, D-curve trip characteristic, and 8 A current rating. It sits in the Basic Devices family, Group Code P310, Product Group 3821.
The 8 A rating governs the continuous load: copper conductors sized for that ampacity, and coordination with upstream protective devices. Three-pole construction means it switches all three phases simultaneously — required for three-phase loads or where simultaneous disconnection is needed. The DIN-rail mount form factor snaps into standard 18 mm per-pole enclosure space, so this unit occupies 3 x 18 mm = 54 mm of rail width.