{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY4263-8","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY4263-8","canonicalUrl":"https://aoctrl.com/siemens/5SY4263-8","factsUrl":"https://aoctrl.com/api/mcp/products/5SY4263-8","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY4263-8, 2-pole miniature circuit breaker, 63 A rated, D tripping characteristic, 10 kA breaking capacity per EN 60898, 15 kA per IEC 60947-2.","salesMarkdown":"## 63 A, D Curve, 2-Pole — Panel Fit For a 63 A frame, that's a magnetic trip threshold between 630 A and 1260 A — well above the locked-rotor draw of most motor circuits this size protects. ## Breaking Capacity and Ambient Derating Breaking capacity is 10 kA per EN 60898 and 15 kA per IEC 60947-2, with the same 15 kA rating for DC per IEC 60947-2. The 63 A rating is at 35 °C ambient. Derate to 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 — if the panel runs hot, size the breaker for the actual load at the expected ambient, not the nameplate 63 A. The SENTRON series is Siemens' standard MCB platform, widely specified across European and export panels. ## Mounting and Environmental Notes Ambient range is -40 °C to 75 °C, with humidity limits of 95% up to 55 °C, 55% up to 70 °C, and 35% up to 75 °C. Halogen-free and silicon-free construction.","metaTitle":"Siemens 5SY4263-8 SENTRON 2-Pole MCB, 63 A, D Curve, 10 kA","metaDescription":"Siemens 5SY4263-8 SENTRON 2-pole MCB, 63 A rated, D tripping characteristic, 10 kA (EN 60898) / 15 kA (IEC 60947-2) breaking capacity.","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","title":"5SY4263-8","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Miniature circuit breaker 400 V 10kA, 2-pole, D, 63 A, D=70 mm","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","Number Of Poles / Note":"2P","acc. to DIN EN 61346-2":"F","at 35 °C / rated value":"63 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":"D","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":"$384.21","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/7a548f613e0d227d0eb903049fd2a42e.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=489628&mlfb=5SY4263-8"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY4263-8","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/5SY4263-8 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}