Siemens 5SY4550-8CC11 miniature circuit breaker, 230 V, 10 kA, 1+N-pole, D-curve, 50 A, for railway applications.
The Siemens 5SY4550-8CC11 is a miniature circuit breaker (MCB) rated 230 V with a 10 kA breaking capacity, configured as 1+N-pole, D-curve, 50 A, and specified for railway applications.
The D-curve and 10 kA SCCR suit it for branch-circuit protection in 230 V single-phase auxiliary supplies — HVAC, lighting, battery chargers, or door controls — where the prospective fault current at the panel is known to stay under 10 kA.
This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm commercial response.
The D-curve magnetic trip operates at 10–20× rated current (500–1000 A instantaneous), suited for loads with high inrush such as transformers and motor drives in railway auxiliary circuits.
The manufacturer typically supplies a declaration of conformity to EN 60898-1 and EN 50155 (railway rolling stock) for this series, along with RoHS and REACH compliance statements. Specific documentation is available on request at quote time.
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