Siemens 5SL6250-7MB — 2-pole C-curve MCB at 50 A
The 2-module-width (36 mm) footprint snaps onto DIN rail and occupies two 18 mm slots — the same pitch as the wider 5SL6 family, so it retrofits into existing SENTRON sub-distribution panels without re-drilling the mounting rail.
If your installation has a transformer closer than about 10 m of cable, verify the PSC at the board; you may need the 10 kA variant.
The 76 mm depth plus 70 mm installation depth means the breaker body extends 70 mm behind the DIN rail — verify the enclosure depth if retrofitting into a shallow consumer unit. The neutral conductor is not switched — this is a 2-pole breaker that switches both phases (line and line) on a split-phase or two-phase system; for a single-phase application with a switched neutral, use a 1P+N variant.