{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY6263-8","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY6263-8","canonicalUrl":"https://aoctrl.com/siemens/5SY6263-8","factsUrl":"https://aoctrl.com/api/mcp/products/5SY6263-8","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY6 series miniature circuit breaker, 5SY6263-8, 2-pole, 63 A rated current, D tripping characteristic, 400 V AC, 6 kA (EN 60898) / 10 kA (IEC 60947-2) breaking capacity.","salesMarkdown":"## 63 A D-curve MCB for high-inrush loads The Siemens 5SY6263-8 is a SENTRON miniature circuit breaker rated 63 A with a D tripping characteristic, meaning it tolerates the high inrush currents typical of motor starters, transformers, and welding equipment without nuisance tripping — the magnetic trip fires at 10–20× rated current rather than the 5–10× of a C-curve. Rated 400 V AC across 2 poles, it breaks 6 kA per EN 60898 for general distribution and 10 kA per IEC 60947-2 for industrial panel duty — the higher figure is the one that governs fault clearance in a motor control centre with upstream transformer impedance. Wire range 0.75–35 mm² solid or stranded, combined box terminals top and bottom, so it accepts the full cross-section of a 63 A feeder without pigtailing or parallel runs. IP20 with conductors connected; touch protection built in. Sealable, halogen-free, silicon-free — relevant for food, pharma, or clean-room panels where outgassing or contamination is a concern. Humidity derating applies above 55 °C: max 95% RH at 55 °C, 55% at 70 °C, 35% at 75 °C. Rated per EN 60898 (6 kA), IEC 60947-2 (10 kA), and UL 1077 / CSA C22.2 No. 235 (5 kA at AC). Overvoltage category III. The UL/CSA listing at 5 kA covers North American supplementary protection applications. Designed for mechanical engineering and industry per the manufacturer's suitability classification. Functional designation per DIN EN 61346-2 and DIN EN 81346-2: F (protective device).","metaTitle":"Siemens 5SY6263-8 SENTRON MCB, 63 A, D-curve, 2-pole, 6/10 k","metaDescription":"Siemens 5SY6263-8 SENTRON miniature circuit breaker, 63 A rated, D tripping characteristic, 2-pole, 400 V AC. Breaking capacity 6 kA per EN 60898, 10 kA per IEC 60947-2. Current pr","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["2-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Solid":"0.75 ... 35 mm²","Width":"36 mm","Height":"90 mm","Sealable":"Yes","Stranded":"0.75 ... 35 mm²","Rated Value":"50/60 Hz","Halogen-Free":"Yes","Silicon-Free":"Yes","Wertebereich":"-25 ... +55 °C","Mounting type":"Quick assembly system","Number of poles":"2","Type of voltage":"AC","lifecycle_stage":"current","Mounting position":"any","Installation depth":"70 mm","Product brand name":"SENTRON","Ambient temperature":"-40 ... +75 °C","Product designation":"Miniature circuit breaker","Protection class IP":"IP20, with connected conductors","at AC / rated value":"400 V","Overvoltage category":"III","Combined Terminal Top":"Yes","Number of width units":"2","Number of poles / Note":"2P","acc. to DIN EN 61346-2":"F","acc. to DIN EN 81346-2":"F","Combined Terminal Bottom":"Yes","circuit-breaker / Design":"5SY6","Suitability for operation":"Mechanical engineering / industry","Current / at AC / rated value":"63 A","Tripping characteristic class":"D","at DC / rated value / maximum":"72 V","acc. to EN 60898 / rated value":"6 kA","Position / of power supply cord":"Any","acc. to IEC 60947-2 / rated value":"10 kA","Product feature / Touch protection":"Yes","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","Tightening torque / with screw-type terminals":"2.5 ... 3.5 N·m","Product function / neutral conductor switching":"No","with multi-phase operation / at AC / rated value":"440 V","with single-phase operation / at AC / rated value":"440 V","Mechanical service life (switching cycles) / typical":"10 000","Tightening torque [lbf·in] / with screw-type terminals":"22 ... 31 lbf·in","AWG number / as coded connectable conductor cross section":"18 ... 4"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$101.87","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=36233&mlfb=5SY6263-8","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SY6263-8/alternatives.json"},"ai":{"faq":[{"question":"What wire sizes does 5SY6263-8 accept?","answer":"Solid and stranded conductors from 0.75 mm² up to 35 mm². Combined box terminals top and bottom accept the full range without special lugs."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY6263-8","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/5SY6263-8 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}}