The Siemens 5SL6463-7BB is a SENTRON miniature circuit breaker (MCB) — a 4-pole, C-curve 63 A device rated for 400 V AC with a 6 kA breaking capacity under both EN 60898 and IEC 60947-2.
This 4-pole breaker occupies 4 modular-width units (72 mm wide) on a DIN rail. Mounting position is unrestricted — horizontal, vertical, or flat — which helps when laying out a crowded enclosure.
Electrical ratings and thermal behaviour
For DC applications, the maximum rated voltage is 72 V.
The closest peer in the SENTRON family is the 5SL4363-7 — a 3-pole C-63 A breaker with a 10 kA breaking capacity (versus 6 kA on the 4-pole 5SL6463-7BB). The 3-pole unit is 54 mm wide (3 MW) and shares the same 76 mm depth and 90 mm height. If your panel was designed around the 5SL4363-7 and you need four poles, the 5SL6463-7BB will not drop in without rewiring: the 4-pole version is 18 mm wider and requires a separate neutral conductor path. The 10 kA vs 6 kA difference also matters if your available fault current exceeds 6 kA at the panel.