The Siemens 5SY5210-7CC12 is a 2-pole miniature circuit breaker (MCB) from the 5SY5 series, rated for 440 V DC with a 10 kA breaking capacity and a C10 trip characteristic.
The 440 V DC rating is the key differentiator here — most standard MCBs top out at 250 V DC or require series connection of poles for higher DC voltages. The C10 characteristic (10 A rated current, magnetic trip at 10x In) provides selectivity with downstream C-curve MCBs in a typical radial DC supply.
Deployment Context
The 2-pole width (2 modules at 18 mm each) fits standard enclosure cutouts. Wire termination accepts 0.75–25 mm² conductors — sized for the 10 A rating with headroom for voltage drop on longer DC runs.