Railway-grade MCB with D-curve selectivity
The Siemens 5SY4508-8CC11 is a 1+N-pole miniature circuit breaker rated at 230 V with a 10 kA breaking capacity, D-curve trip characteristic, and 8 A current rating, explicitly specified for railway applications.
What the ratings mean for the panel
The 10 kA breaking capacity at 230 V AC covers the prospective short-circuit current at the secondary side of a typical rail substation distribution panel; verify the upstream SCCR before coordinating with a larger main breaker. The 1+N-pole configuration switches both line and neutral, which is required for single-phase railway auxiliary circuits where the neutral is not bonded to the vehicle chassis.