{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY4550-8CV","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY4550-8CV","canonicalUrl":"https://aoctrl.com/siemens/5SY4550-8CV","factsUrl":"https://aoctrl.com/api/mcp/products/5SY4550-8CV","rawCanonicalId":null},"summary":{"shortDescription":"Siemens 5SY4550-8CV, MCB, Icu=15kA 230/400V, 1P+N, D50 characteristic.","salesMarkdown":"## What the 15 kA Icu means for the panel The Siemens 5SY4550-8CV is a 1P+N miniature circuit breaker with a D50 tripping characteristic and a rated ultimate breaking capacity (Icu) of 15 kA at 230/400 V. The D50 curve means the magnetic trip holds up to 10× rated current (500 A for this 50 A unit), so it tolerates the inrush of motor loads, transformers, or capacitive banks without nuisance tripping on start-up. The 1P+N form factor occupies a single modular width (roughly 18 mm), leaving the adjacent slot free for the neutral busbar or a second MCB.","metaTitle":"Siemens 5SY4550-8CV MCB 1P+N D50, 15kA Icu","metaDescription":"Siemens 5SY4550-8CV miniature circuit breaker, 1P+N, D50 curve, 15kA Icu at 230/400V. Current lifecycle stage. Available to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["1-Pole MCB (DIN Rail)"],"specifications":{"lifecycle_stage":"current"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/e66d8b09554967fcb5baf61dd0da159d.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=1531675&mlfb=5SY4550-8CV","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SY4550-8CV/alternatives.json"},"ai":{"faq":[{"question":"What does the D50 curve mean for motor starting?","answer":"The D characteristic provides a magnetic trip threshold of 10× In (500 A), which avoids nuisance tripping during the high inrush of direct-on-line motor starts, transformer energization, or capacitive loads."},{"question":"Where can I buy the 5SY4550-8CV?","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/5SY4550-8CV","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/5SY4550-8CV 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}}