The Siemens SENTRON 5SY5150-7CC11 is a 1-pole miniature circuit breaker rated 50 A with a C tripping characteristic, designed for DC railway applications per IEC 60947-2. It delivers a 10 kA breaking capacity at 220 V DC, with a maximum operating voltage of 250 V DC — the rating that governs its fit for DC traction auxiliary circuits, battery banks, and wayside power distribution where the fault current can reach that level.
Mounting and panel fit
Snaps onto DIN rail via the quick-assembly system and occupies a single modular width (18 mm). Mounting position is any, so it can be laid flat or vertical inside a crowded enclosure. Installation depth is 70 mm; the overall body depth is 76 mm, which clears most standard 80 mm-deep enclosures. IP20 with connected conductors — finger-safe once wired, not for wet locations.