The Siemens 5SY4450-7CC11 is a 4-pole miniature circuit breaker rated 400 V with a 10 kA breaking capacity, C-curve trip characteristic, and 50 A current rating, explicitly specified for railway applications.
Deployment context
Snap-on DIN rail mounting for standard 35 mm rail in railway control panels or distribution boards. The 4-pole width (72 mm, 4 modules) fits alongside other Siemens 5SY series breakers in a common enclosure.