What this MCB is for
The Siemens 5SL5132-6CC is a 1-pole miniature circuit breaker rated for 125 V DC circuits with a 10 kA breaking capacity and a B32 trip characteristic. It's built for DC branch-circuit protection in control panels, distribution boards, and industrial equipment where a single-pole DC interruption is needed.
The 125 V DC rating is the key figure here — this isn't a standard AC MCB. DC arcs are harder to extinguish than AC, so this breaker is specifically designed and tested for DC interruption. The B32 characteristic gives a 32 A rated current with a B-curve trip (3-5x In magnetic trip), suited for resistive and light inductive DC loads where you want fast short-circuit clearing but some inrush headroom.