{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY7663-6","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY7663-6","canonicalUrl":"https://aoctrl.com/siemens/5SY7663-6","factsUrl":"https://aoctrl.com/api/mcp/products/5SY7663-6","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON miniature circuit breaker, 5SY7663-6, 4-pole 3P+N, 63 A, B characteristic, 15 kA per EN 60898, 20 kA per IEC 60947-2, 50/60 Hz.","salesMarkdown":"## What this 63 A B-curve MCB does in a panel The Siemens SENTRON 5SY7663-6 is a 4-pole miniature circuit breaker (3P+N) rated 63 A at 35 °C with a B tripping characteristic — meaning it trips between 3 and 5 times rated current, fast enough for residential and light commercial cable protection but without the nuisance trips a C-curve might cause on motor inrush. ## Derating and temperature — the real-world current limit The 63 A rating holds at 35 °C ambient. At 40 °C it derates to 59.98 A, at 45 °C to 58.4 A, at 50 °C to 56.83 A, at 55 °C to 55.12 A, and at 60 °C to 53.42 A. The 5SY7663-6 occupies 4 modular width units (72 mm) with a depth of 76 mm and installation depth of 70 mm. The B-curve characteristic is energy limitation class 3, meaning it limits let-through energy on short circuits.","metaTitle":"Siemens SENTRON 5SY7663-6 MCB, 63 A 4P B-Curve, 15 kA","metaDescription":"Siemens SENTRON 5SY7663-6 miniature circuit breaker, 4-pole 3P+N, 63 A rated, B characteristic, 15 kA (EN 60898) / 20 kA (IEC 60947-2). Active production, sourced to order against","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Miniature Circuit Breakers (MCB)"],"specifications":{"Depth":"76 mm","Width":"72 mm","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","Halogen-Free":"Yes","Silicon-Free":"Yes","Number Of Poles":"4","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":"3P+N","acc. to DIN EN 61346-2":"F","Energy Limitation Class":"3","at 35 °C / rated value":"63 A","at 40 °C / rated value":"59.98 A","at 45 °C / rated value":"58.4 A","at 50 °C / rated value":"56.83 A","at 55 °C / rated value":"55.12 A","at 60 °C / rated value":"53.42 A","Combined Terminal Bottom":"Yes","Suitability For Operation":"Mechanical engineering / industry","Number Of Modular Width Units":"4","Tripping Characteristic Class":"B","acc. to EN 60898 / rated value":"15 kA","Position / Of Power Supply Cord":"Any","acc. to IEC 60947-2 / rated value":"20 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":"Yes","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":"https://cdn.aoctrl.com/96a2f2b4f2f7c4ab7e865a41bbd54d51.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=15331&mlfb=5SY7663-6","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SY7663-6/alternatives.json"},"ai":{"faq":[{"question":"What is the breaking capacity of 5SY7663-6?","answer":"It is rated 15 kA per EN 60898 and 20 kA per IEC 60947-2, both at 50/60 Hz. The higher IEC figure applies when the breaker is used per the industrial standard, which is common in control panels."},{"question":"What does the B characteristic mean on this MCB?","answer":"The B curve trips at 3 to 5 times rated current (189 A to 315 A for a 63 A breaker). It is designed for cable protection in residential and light commercial circuits where inrush currents are low — not for motor starts or transformer loads that would need a C or D curve."},{"question":"Where can I buy 5SY7663-6 and how is it quoted?","answer":"It is sourced and quoted to order against an RFQ through independent distribution channels. Availability and current pricing are confirmed at quote time — no stock count or price is published here."},{"question":"What compliance documentation does Siemens provide for 5SY7663-6?","answer":"The breaker is designed to EN 60898 and IEC 60947-2. It carries pollution degree 3 and overvoltage category III ratings. The SENTRON series typically includes CE, UKCA, and EAC declarations; specific RoHS/REACH declarations are available from Siemens documentation. The product is halogen-free and silicon-free."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY7663-6","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/5SY7663-6 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}}