{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY5203-6CC11","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY5203-6CC11","canonicalUrl":"https://aoctrl.com/siemens/5SY5203-6CC11","factsUrl":"https://aoctrl.com/api/mcp/products/5SY5203-6CC11","rawCanonicalId":null},"summary":{"shortDescription":"Siemens 5SY5203-6CC11, universal current MCB, 440 V DC / 400 V AC, 10 kA, 2-pole, B-curve, 3 A, for railway applications.","salesMarkdown":"DC arcs don't self-extinguish at zero crossing the way AC arcs do, so the breaker's arc chamber and contact gap are physically larger than a standard AC-only MCB of the same amp rating. That's why this part carries the \"universal current\" designation — it's not just a derated AC breaker. No minimum order quantity is imposed by the supply channel, but rail-sector buyers typically order in tray quantities (10–20 pieces) to cover panel builds. ## Panel and integration notes Snap-on DIN rail mounting — fits any 35 mm rail in a standard IP40 or IP54 railway enclosure. The 2-pole width (2 modules, 36 mm) leaves room for adjacent auxiliary contact blocks or shunt trips if you need remote trip indication. Terminal capacity accepts up to 25 mm² conductor, which is generous for a 3 A breaker but matches the larger contact structure needed for the DC arc gap.","metaTitle":"Siemens 5SY5203-6CC11 MCB, 3A 2-pole B-curve, 440V DC/400V A","metaDescription":"Siemens 5SY5203-6CC11 universal current MCB, 3 A, 2-pole, B-curve, 440 V DC / 400 V AC, 10 kA, for railway applications. Current lifecycle stage. Quoted to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["2-Pole MCB (DIN Rail)"],"specifications":{"title":"5SY5203-6CC11","description":"Circuit breaker Universal current 440 V DC 400 V AC 10kA, 2-pole, B, 3 A for railway applications","lifecycle_stage":"current"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/2d3eebaf2d2834d3d193230c54e5199b.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=434791&mlfb=5SY5203-6CC11"},"ai":{"faq":[{"question":"What is the 5SY5203-6CC11 used for?","answer":"It's a 2-pole, 3 A, B-curve miniature circuit breaker rated for 440 V DC and 400 V AC with a 10 kA breaking capacity, designed for railway applications — typically DC traction auxiliary supplies, signal power, and station AC sub-distribution where universal current capability is required."},{"question":"Where can I buy the 5SY5203-6CC11 and how is it quoted?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — no stock count or price is published here."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY5203-6CC11","citationPolicyUrl":"https://aoctrl.com/llms.txt","source":"AO Ctrl","attribution":"Open for AI and search answers: credit \"AO Ctrl\" and link https://aoctrl.com/siemens/5SY5203-6CC11 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}