The Siemens 5SY5208-7CC12 is a 2-pole miniature circuit breaker from the 5SY5 series, rated for 440 V DC with a 10 kA breaking capacity and a C8 tripping characteristic.
The 440 V DC rating covers common DC bus voltages in drives and solar combiner boxes — it will hold off arc extinction at that voltage, which is the critical parameter for DC breakers. The C8 curve (8 A nominal, magnetic trip at 5–10× In) is sized for moderate inrush loads: think a bank of small DC contactors or a PLC power supply, not a large capacitor bank.