{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY8263-7","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY8263-7","canonicalUrl":"https://aoctrl.com/siemens/5SY8263-7","factsUrl":"https://aoctrl.com/api/mcp/products/5SY8263-7","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON miniature circuit breaker, 5SY8263-7, 2-pole C-curve, 63 A AC, 25 kA breaking capacity per IEC 60947-2, 36 mm wide.","salesMarkdown":"On DC circuits it's rated 15 kA at 72 V max — good for control-power or battery-backed buswork, not for high-voltage DC strings. That covers standard 400 V line-to-line industrial supplies across Europe and most of Asia. ## Panel fit and derating It's 36 mm wide — two modular units on a DIN rail. Mount in any position, quick-assembly system snaps onto the rail without tools. Rated 63 A at 45 °C ambient; at 50 °C it derates to 61.05 A, at 55 °C to 59.03 A. The breaker itself tolerates -40 to 75 °C ambient, so the enclosure temp, not the breaker, is your limit.","metaTitle":"Siemens 5SY8263-7 SENTRON MCB, 2-Pole C-Curve 63 A, 25 kA","metaDescription":"Siemens 5SY8263-7 2-pole C-curve MCB, 63 A rated, 25 kA breaking capacity per IEC 60947-2. 36 mm wide, IP20, current production. Order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","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","Design Of Pole":"2P","Number Of Poles":"2","lifecycle_stage":"current","Fastening Method":"Quick assembly system","Mounting Position":"any","at AC rated value":"63 A","Installation Depth":"70 mm","Product Brand Name":"SENTRON","Degree Of Pollution":"3","Product Designation":"Miniature circuit breaker","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","Combined Terminal Top":"Yes","at 45 °C rated value":"63 A","at 50 °C rated value":"61.05 A","at 55 °C rated value":"59.03 A","according to EN 61346-2":"F","Combined Terminal Bottom":"Yes","according to IEC 81346-2":"F","Suitability For Operation":"Mechanical engineering / industry","Neutral Conductor Switching":"No","Number Of Modular Width Units":"2","Position Of Power Supply Cord":"Any","Tripping Characteristic Class":"C","according to IEC 60947-2 rated value":"25 kA","Influence Of The Surrounding Temperature":"max. 95% to 55°C, max. 55% to 70°C, max. 35% to 75°C","Type Of Voltage Of The Operating Voltage":"AC","at DC according to IEC 60947-2 rated value":"15 kA","Value Range Of The Supply Voltage Frequency":"50/60 Hz","operating voltage at DC rated value maximum":"72 V","with multi-phase operation at AC rated value":"440 V","with single-phase operation at AC rated value":"440 V","at AC according to UL 1077 and CSA C22.2 No.235":"5 kA","vibration resistance according to IEC 60068-2-6":"±1mm at 5 to 25Hz; 50m/s² at 25 to 150Hz","Mechanical Service Life (Switching Cycles) Typical":"10 000","Product Extension Installable Supplementary Devices":"Yes","supply voltage with single-phase operation at AC rated value":"230 V","power loss [W] for rated value of the current at AC in hot operating state per pole":"6 W"}},"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=223626&mlfb=5SY8263-7","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SY8263-7/alternatives.json"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY8263-7","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/5SY8263-7 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}}