Siemens 5SY4604-7CC11 miniature circuit breaker, 400V 10kA, 3+N-pole, C-curve, 4A, for railway applications.
For a maintenance-spares purchaser, this part is a critical spare to hold in the cabinet before the failure — no spare, no sleep on a legacy railway install. No official second-source alternate is listed, so dual-sourcing relies on stocking the Siemens part.
It is a miniature circuit breaker rated 400 V, 10 kA, 3+N-pole, C-curve, 4 A, specifically for railway applications — protecting auxiliary circuits in rolling stock or station distribution panels against overcurrent and short circuits.
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