DC-rated miniature circuit breaker, 1-pole B50
The Siemens 5SY5150-6CC12 is a 1-pole miniature circuit breaker from the 5SY5 series, rated for 220 V DC with a B50 tripping characteristic and a 10 kA breaking capacity. The B50 curve means it trips between 3 and 5 times rated current — suited for protecting resistive and moderate inductive DC loads where short-circuit clearance is the priority, not nuisance tripping from inrush.
What the DC rating means for fit
The 220 V DC rating and 10 kA breaking capacity define where this breaker fits. DC arcs are harder to extinguish than AC — the 10 kA interrupt rating at 220 V DC means the arc chute is sized for that energy level. On a DC bus supplying drives, controls, or telecom rectifiers, this breaker clears a fault without welding contacts or cascading upstream. The 1-pole form factor fits standard DIN-rail distribution boards.