The Siemens 5SY5102-7CC12 is a 1-pole miniature circuit breaker from the 5SY5 series, rated for 220V DC with a 10kA breaking capacity and a C-curve trip characteristic. This is the DC-rated variant of the 5SY5 family, built for DC branch circuit protection where the standard AC MCB won't hold.
Snap-on DIN rail mount for standard 35mm rail, same footprint as the AC 5SY4 series. The DC rating and 10kA interrupting capacity make it a fit for DC control circuits in switchgear, UPS output distribution, or photovoltaic combiner boxes where a single-pole DC breaker is needed.