{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY4663-8","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY4663-8","canonicalUrl":"https://aoctrl.com/siemens/5SY4663-8","factsUrl":"https://aoctrl.com/api/mcp/products/5SY4663-8","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY4663-8, 4-pole miniature circuit breaker, D tripping characteristic, 3P+N, 10 kA (EN 60898) / 15 kA (IEC 60947-2), 400 V AC, 4 MW width.","salesMarkdown":"That matters when you need full isolation on a TN-S or TT system or when downstream equipment expects a broken neutral during a fault. D-curve tripping characteristic means it holds through the high inrush of motor loads, transformers, or welding gear — magnetic trip kicks in at 10–20× rated current rather than the 5–10× of a C-curve. If you're specifying for a control panel feeding contactors or small drives, D-curve avoids nuisance trips on startup. Breaking capacity sits at 10 kA per EN 60898 and 15 kA per IEC 60947-2 — the higher figure is the one that governs in industrial panels where the prospective fault current can exceed 10 kA. ## Standards and compliance — what the approvals cover Rated and certified to IEC / EN 60898-1 (domestic-style MCB) and IEC / EN 60947-2 / UL1077 (industrial MCB / supplementary protector). The dual rating gives you flexibility: the 10 kA figure is the standard household breaking capacity, while the 15 kA per 60947-2 covers the higher fault levels typical in factory distribution boards. UL1077 listing is for supplementary protection — not a branch-circuit rated breaker, so check your local code if the panel requires a UL489 device. Halogen-free and silicon-free construction — relevant if the panel goes into a clean room, semiconductor fab, or food-processing area where outgassing from a fault could contaminate the environment. Degree of pollution 3 and overvoltage category III confirm it's rated for the conductive, transient-heavy environment inside an industrial enclosure. ## Physical fit — panel integration notes Occupies 4 modular width units (4 MW) on a DIN rail — 72 mm wide, 90 mm tall, 76 mm deep. The 70 mm installation depth is the key clearance number for the enclosure depth behind the panel door. Mounts in any position and uses the Siemens quick-assembly system — clips onto the rail without tools and locks with the integral latch. Combined terminal at both top and bottom — the same terminal accepts both the busbar fork and the stranded/solid wire, so you don't need separate ring-lug adapters. IP20 with connected conductors is the norm for a panel-mount breaker; keep the front cover on during live work. Sealable — the toggle can be locked in the off position with a padlock hasp, which satisfies lockout/tagout requirements without an external breaker lock. Handy for a quick maintenance isolation on a machine panel. ## Environmental and application range Vibration resistance per IEC 60068-2-6: ±1 mm at 5–25 Hz and 50 m/s² at 25–150 Hz. That's enough for installation on a machine frame or near a motor — not a problem in a standard cabinet, but worth noting if the breaker mounts on a vibrating conveyor line. Supply frequency is 50/60 Hz — universal for worldwide use. Operating voltage peak is 440 V AC for both single-phase and multi-phase operation, so it covers 400 V nominal systems with tolerance.","metaTitle":"Siemens 5SY4663-8 SENTRON MCB, D-curve, 3P+N, 10kA / 15kA, 4","metaDescription":"Siemens 5SY4663-8 SENTRON miniature circuit breaker, D tripping characteristic, 3P+N, 10 kA per EN 60898 / 15 kA per IEC 60947-2, 400 V AC. Active production; sourced to order agai","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["4-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Width":"72 mm","title":"5SY4663-8","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","Standard":"IEC / EN 60898-1, IEC / EN 60947-2 / UL1077","description":"Miniature circuit breaker 400 V 10kA, 3+N-pole, D, 63 A, D=70 mm","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","at DC rated value":"60 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":"10 kA","according to IEC 60947-2 rated value":"15 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 (Operating 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":"5 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$142.24","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/89cf39c712dc0be27aa6b5feea5422ae.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=256205&mlfb=5SY4663-8"},"ai":{"faq":[{"question":"What is the breaking capacity of 5SY4663-8?","answer":"10 kA per EN 60898 and 15 kA per IEC 60947-2. At 400 V AC the higher figure governs for industrial panel fault levels."},{"question":"Will 5SY4663-8 drop into a panel specified around 5SY6332-7CC without rewiring?","answer":"Not without checking the existing busbar and wiring layout. Both are 4-pole SENTRON MCBs on DIN rail, but the 5SY4663-8 is a 3P+N unit with switched neutral, while the 5SY6332-7CC may have a different pole configuration or terminal layout. Compare the wiring diagram before swapping."},{"question":"What compliance documentation does Siemens provide for 5SY4663-8?","answer":"The breaker is certified to IEC / EN 60898-1, IEC / EN 60947-2, and UL1077. It is halogen-free and silicon-free. Standard Siemens declarations for RoHS and REACH are available on request."},{"question":"Where can I buy 5SY4663-8 and what is the lead time?","answer":"The 5SY4663-8 is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — no blanket stock figure."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY4663-8","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/5SY4663-8 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}}