The Siemens 5SY4225-6CC11 is a 2-pole miniature circuit breaker (MCB) rated 400 V with a 10 kA breaking capacity, B-curve trip characteristic, and 25 A current rating, specifically designated for railway applications.
Ratings that matter for fit
The 2-pole configuration breaks both phase conductors simultaneously, which is required for single-phase 230 V line-to-line circuits or for isolating both poles on a 400 V line-to-neutral system where the neutral is switched. The 25 A rating suits feeder circuits supplying lighting, control transformers, or smaller distribution sub-panels.