Siemens 5SY4450-8CC11, miniature circuit breaker, 400 V, 10 kA, 4-pole, D characteristic, 50 A, railway applications.
The 4-pole form factor (3 poles + switched neutral) occupies four DIN-rail module widths in a standard 35 mm enclosure — account for the fill factor when laying out a rail with adjacent breakers or auxiliaries. Rated for 400 V line-to-line, so it suits both 230/400 V three-phase rail auxiliary networks and single-phase 230 V branch circuits when the neutral pole is used as the switched pole.
It is a miniature circuit breaker rated 400 V, 10 kA, 4-pole, D-curve, 50 A, specified for railway applications — suitable for protecting auxiliary circuits in rolling stock and trackside distribution.
This part is sourced and quoted to order against an RFQ through independent distribution; availability and current pricing are confirmed at quote time.
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