{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY6663-8CC","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY6663-8CC","canonicalUrl":"https://aoctrl.com/siemens/5SY6663-8CC","factsUrl":"https://aoctrl.com/api/mcp/products/5SY6663-8CC","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON miniature circuit breaker, 5SY6663-8CC, 3P+N, D-curve, 63 A, 400 V AC, 6 kA breaking capacity per EN 60898, 4 MWUs, IP20.","salesMarkdown":"Breaking capacity is 6 kA per EN 60898 at 400 V AC, and 5 kA per UL 1077 and CSA C22.2 No. 235 — so it's rated for North American panel builds under UL 508A as a supplementary protector, not just European IEC installations. At 63 A, that's a solid 630–1260 A instantaneous magnetic trip window. ## D-curve 63 A — where this fits and where it doesn't Compared to a C-curve sibling like the 5SY4140-7 (which trips at 5–10× In and is better for general-purpose resistive and moderate inductive loads), the 5SY6663-8CC's D-curve is the right call for circuits with sustained inrush — think conveyor drives, hydraulic pump motors, or control transformers feeding a bank of contactors. IP20 with connected conductors means the busbar and wiring provide the touch protection; the breaker body itself is finger-safe only when wired. Ambient temperature range is -40 °C to +75 °C, with derating above 55 °C: max 95% RH at 55 °C, dropping to 35% RH at 75 °C. If the panel sits near a furnace or in a refrigerated warehouse, the cold end is fine; the hot end needs the humidity derating curve applied. Vibration resistance per IEC 60068-2-6: ±1 mm at 5–25 Hz, 50 m/s² at 25–150 Hz — survives the usual machine-mounted panel shake on a conveyor line or compressor skid. Power loss is 4.9 W per pole at rated current in hot operating state — for a 4-pole unit that's 19.6 W total heat to vent inside the enclosure.","metaTitle":"Siemens 5SY6663-8CC SENTRON MCB, D-curve, 63A, 3P+N, 6kA","metaDescription":"Siemens 5SY6663-8CC SENTRON miniature circuit breaker, 400V AC, 6kA (EN 60898), D-curve, 63A, 3P+N with neutral switching. Active production. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["4-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Width":"72 mm","title":"5SY6663-8CC","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Miniature circuit breaker 400 V 6kA, 3+N-pole, D, 63A","Halogen-Free":"Yes","Silicon-Free":"Yes","Design Of Pole":"3P+N","Number Of Poles":"4","lifecycle_stage":"current","Fastening Method":"Quick assembly system","Mounting Position":"any","at AC rated value":"400 V","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","Combined Terminal Bottom":"Yes","Suitability For Operation":"Mechanical engineering / industry","Neutral Conductor Switching":"Yes","Number Of Modular Width Units":"4","Position Of Power Supply Cord":"Any","Tripping Characteristic Class":"D","according to EN 60898 rated value":"6 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","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 (Operating Cycles) Typical":"10 000","Product Extension Installable Supplementary Devices":"Yes","power loss [W] for rated value of the current at AC in hot operating state per pole":"4.9 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/d5d0c833cebb337908b87555a9ea856e.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=278569&mlfb=5SY6663-8CC"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY6663-8CC","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/5SY6663-8CC 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}}