{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY4263-6KK11","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY4263-6KK11","canonicalUrl":"https://aoctrl.com/siemens/5SY4263-6KK11","factsUrl":"https://aoctrl.com/api/mcp/products/5SY4263-6KK11","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON miniature circuit breaker, 5SY4263-6KK11, 2-pole, B tripping characteristic, 63 A rated current, 10 kA breaking capacity per EN 60898, 15 kA per IEC 60947-2, for railway applications.","salesMarkdown":"The 63 A rating at 35 °C is the baseline; the breaker must be derated as ambient temperature rises — 59.16 A at 40 °C, 57.14 A at 45 °C, 55.06 A at 50 °C, 52.92 A at 55 °C, and 50.65 A at 60 °C. B-curve (trips at 3–5× In) is standard for resistive and general-purpose loads — lighting, control transformers, small heaters. It avoids nuisance trips from inrush on motor circuits; for motor-starting duty, a C-curve would be more typical, but B-curve is correct for the listed railway and mechanical-engineering applications. The 2-pole form (2P) isolates both phase and neutral in single-phase AC circuits. The combined terminal at top and bottom accepts conductors without separate busbar links.","metaTitle":"Siemens 5SY4263-6KK11 SENTRON MCB, 2P B-curve 63 A, 10kA EN","metaDescription":"Siemens 5SY4263-6KK11 SENTRON miniature circuit breaker, 2-pole B-curve 63 A, 10 kA per EN 60898, 15 kA per IEC 60947-2. Railway-rated, IP20. Quoted on request.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["2-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Width":"36 mm","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","Halogen-Free":"Yes","Silicon-Free":"Yes","Number Of Poles":"2","Type Of Voltage":"AC","lifecycle_stage":"current","Fastening Method":"Quick assembly system","Mounting Position":"any","Installation Depth":"70 mm","Product Brand Name":"SENTRON","Degree Of Pollution":"3","Product Designation":"Miniature circuit breaker","acc. to IEC 81346-2":"F","at AC / rated value":"63 A","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","Combined Terminal Top":"Yes","Design Of The Product":"For railway applications","Number Of Poles / Note":"2P","acc. to DIN EN 61346-2":"F","Energy Limitation Class":"3","at 35 °C / rated value":"63 A","at 40 °C / rated value":"59.16 A","at 45 °C / rated value":"57.14 A","at 50 °C / rated value":"55.06 A","at 55 °C / rated value":"52.92 A","at 60 °C / rated value":"50.65 A","Combined Terminal Bottom":"Yes","Suitability For Operation":"Mechanical engineering / industry","Number Of Modular Width Units":"2","Tripping Characteristic Class":"B","acc. to EN 60898 / rated value":"10 kA","Position / Of Power Supply Cord":"Any","acc. to IEC 60947-2 / rated value":"15 kA","Product Feature / Touch Protection":"Yes","Supply Voltage Frequency / Rated Value":"50/60 Hz","Influence Of The Surrounding Temperature":"max. 95% to 55°C, max. 55% to 70°C, max. 35% to 75°C","at DC / acc. to IEC 60947-2 / rated value":"15 kA","at AC / acc. to UL 1077 and CSA C22.2 No.235":"5 kA","vibration resistance / acc. to IEC 60068-2-6":"±1mm at 5 to 25Hz; 50m/s² at 25 to 150Hz","Product Function / Neutral Conductor Switching":"No","with multi-phase operation / at AC / rated value":"440 V","operating voltage / at DC / rated value / maximum":"72 V","with single-phase operation / at AC / rated value":"440 V","Mechanical Service Life (Operating Cycles) / Typical":"10 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=52499&mlfb=5SY4263-6KK11","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SY4263-6KK11/alternatives.json"},"ai":{"faq":[{"question":"What is the breaking capacity of 5SY4263-6KK11?","answer":"It breaks 10 kA per EN 60898 and 15 kA per IEC 60947-2, giving extra headroom for industrial panels."},{"question":"Will 5SY4263-6KK11 drop into a panel specified around 5SY4140-7 without rewiring?","answer":"Both are 2-pole SENTRON MCBs with the same 36 mm width and DIN-rail mounting, so the mechanical fit is identical. However, the 5SY4140-7 is a lower-current variant (40 A vs 63 A) and may have a different breaking capacity; verify the load and fault-level ratings before swapping."},{"question":"What compliance documentation does this brand provide for 5SY4263-6KK11?","answer":"The product is halogen-free and silicon-free, designed for railway applications, and carries the SENTRON brand. Compliance with EN 60898 and IEC 60947-2 is declared; specific RoHS/REACH/UL documentation should be requested at quote time."},{"question":"How do I get current pricing and availability for 5SY4263-6KK11?","answer":"Submit an RFQ against this order code; availability and current pricing are confirmed at quote time through independent distribution."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY4263-6KK11","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/5SY4263-6KK11 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}}