{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY4203-6CC11","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY4203-6CC11","canonicalUrl":"https://aoctrl.com/siemens/5SY4203-6CC11","factsUrl":"https://aoctrl.com/api/mcp/products/5SY4203-6CC11","rawCanonicalId":null},"summary":{"shortDescription":"Siemens 5SY4203-6CC11 miniature circuit breaker, 400 V, 10 kA interrupting capacity, 2-pole, B-curve, 3 A, railway applications.","salesMarkdown":"The B-curve (3–5× In magnetic trip) means it will hold through moderate inrush from resistive loads and lighting ballasts but will trip faster on a hard short than a C-curve would, giving better selectivity with downstream fuses or smaller MCBs. The 2-pole configuration switches both phase conductors simultaneously, which is standard for single-phase AC circuits derived from a transformer or for DC circuits where both poles need isolation. At 3 A it protects small control transformers, signal power supplies, or lighting circuits — not motor or heater loads.","metaTitle":"Siemens 5SY4203-6CC11 MCB 400V 10kA 2-pole B 3A railway","metaDescription":"Siemens 5SY4203-6CC11 miniature circuit breaker, 400V 10kA, 2-pole, B-curve, 3A, for railway applications. Active production, sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["2-Pole MCB (DIN Rail)"],"specifications":{"lifecycle_stage":"current"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/b2fe3462763f92cb86f1877f4aac0bf1.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=357254&mlfb=5SY4203-6CC11","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SY4203-6CC11/alternatives.json"},"ai":{"faq":[{"question":"What is the 5SY4203-6CC11 used for?","answer":"It is a miniature circuit breaker for railway applications, rated 400 V, 10 kA interrupting capacity, 2-pole, B-curve, 3 A — used to protect control transformers, signal power supplies, and lighting circuits in rolling stock or trackside panels."},{"question":"Where can I buy the 5SY4203-6CC11?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY4203-6CC11","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/5SY4203-6CC11 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-09-02T08:15:54.622Z","lastPublished":"2026-09-02T08:15:54.622Z","indexable":true}}