The Siemens 5SY5108-7CC12 is a 1-pole miniature circuit breaker from the 5SY5 series, with a C8 tripping curve, rated for 220V DC and a 10kA breaking capacity. It protects DC circuits against overload and short-circuit faults, tripping on sustained overcurrents above 8x the rated current (the C-curve characteristic).
Where it fits — panel deployment
The 5SY5 series is designed for DIN-rail mounting in control panels and sub-distribution boards. The single-pole width (roughly 18 mm per module) saves rail space in DC branch circuits. Rated for 220V DC, it suits telecom rectifier outputs, solar combiner boxes, battery-bank feeders, and DC motor control circuits where DC fault currents need fast interruption. The 10kA SCCR at 220V DC provides adequate headroom for most industrial DC supplies with source impedances that limit prospective fault current below that level.