{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY4603-8CV","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY4603-8CV","canonicalUrl":"https://aoctrl.com/siemens/5SY4603-8CV","factsUrl":"https://aoctrl.com/api/mcp/products/5SY4603-8CV","rawCanonicalId":null},"summary":{"shortDescription":"Siemens 5SY4603-8CV, MCB, Icu=15kA 400V, 3P+N, D3 characteristic, current lifecycle stage.","salesMarkdown":"The Siemens 5SY4603-8CV is a miniature circuit breaker (MCB) with a D3 tripping characteristic, configured as 3-pole plus neutral (3P+N). Its interrupting capacity is rated at 15 kA Icu at 400 V AC. ## What the Ratings Mean for Fit The D3 curve means this breaker is designed for loads with high inrush currents — typically motor starters, transformers, or discharge lighting — where a B-curve or C-curve would nuisance-trip on startup. The 3-pole-plus-neutral configuration suits three-phase four-wire systems (e.g., TN-S or TN-C-S) where the neutral requires overcurrent protection. The 15 kA Icu at 400 V AC is the maximum fault current the breaker can interrupt once; for applications requiring multiple operations under fault, check the Ics (service breaking capacity) value, which is typically a percentage of Icu for this class.","metaTitle":"Siemens 5SY4603-8CV MCB, 3P+N D3, 15kA Icu at 400V","metaDescription":"Siemens 5SY4603-8CV miniature circuit breaker, 3-pole+N, D3 characteristic, 15kA Icu at 400V AC. Lifecycle stage: current. Available to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Miniature Circuit Breakers (MCB)"],"specifications":{"lifecycle_stage":"current"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/ea4ad3e3ebd77260298a615217d7c096.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=1531683&mlfb=5SY4603-8CV","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SY4603-8CV/alternatives.json"},"ai":{"faq":[{"question":"What does the description 'MCB Icu=15kA 400V 3P+N D3' mean?","answer":"It is a miniature circuit breaker with a D3 tripping characteristic, 3 poles plus neutral, and a rated ultimate short-circuit breaking capacity (Icu) of 15 kiloamperes at 400 volts AC."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY4603-8CV","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/5SY4603-8CV 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}}