The Siemens 5SL3263-7CC is a 2-pole miniature circuit breaker rated 63 A with a C-trip curve and a 4.5 kA breaking capacity at 400 V.
Snap-on DIN rail mounting for standard 35 mm rail. The 2-pole form factor occupies two modular width units in the enclosure. C-curve characteristic (10× to 15× In magnetic trip) suits it for motor and lighting circuits with moderate inrush — common in panelboard and sub-distribution builds.