{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY4640-8","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY4640-8","canonicalUrl":"https://aoctrl.com/siemens/5SY4640-8","factsUrl":"https://aoctrl.com/api/mcp/products/5SY4640-8","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY4640-8, 4-pole (3P+N) miniature circuit breaker, D tripping characteristic, 10 kA breaking capacity per IEC 60898-1, 15 kA per IEC 60947-2, 400 V AC, IP20.","salesMarkdown":"## D-curve 4-pole MCB for motor and transformer branch protection Its D-curve allows a brief magnetic-trip delay — typically 10–20× rated current — so it won't nuisance-trip on startup surge while still providing short-circuit protection. Rated 400 V AC (440 V max multi-phase), it breaks 10 kA per IEC 60898-1 or 15 kA per IEC 60947-2, and 15 kA at 60 V DC per IEC 60947-2. The 4-pole layout with switched neutral (3P+N) means the neutral is opened and closed with the phases, useful for TN-S or TT systems where isolating all live conductors is required. ## Breaking capacity across standards This breaker carries three distinct interrupting ratings depending on the applicable standard: 10 kA per EN 60898-1 (household-type), 15 kA per IEC 60947-2 (industrial), and 5 kA per UL 1077 / CSA C22.2 No. 235. For DC circuits, it is rated 15 kA at 60 V (max 72 V). The dual rating means it can be specified in both residential and industrial panels — the 15 kA IEC figure gives headroom for higher fault-current locations. The D-curve and 4-pole format make it a common choice for branch circuits feeding motor control centers or small transformers where neutral switching is required. ## Installation and environmental fit Snap-on DIN rail mounting, any orientation. Depth 76 mm (installation depth 70 mm), width 72 mm (4 MW), height 90 mm. IP20 with conductors connected; pollution degree 3 (conductive or dry non-conductive pollution). Operating temperature range -40 to 75 °C, with humidity limits up to 95% at 55 °C. Terminal design allows combined top/bottom feed — supply cord position is arbitrary. Sealable for tamper-proof applications. Halogen-free and silicon-free construction.","metaTitle":"Siemens 5SY4640-8 SENTRON MCB, D-Curve 4-Pole, 10kA IEC","metaDescription":"Siemens 5SY4640-8 SENTRON miniature circuit breaker, 4-pole 3P+N, D-curve, 10 kA per IEC 60898-1, 15 kA per IEC 60947-2. Active production, sourced to order. Request a quote.","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":"5SY4640-8","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, 40A, 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":"3 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$81.28","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/cc4f8262528fb7521dbd8d8f645a120b.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=8113&mlfb=5SY4640-8"},"ai":{"faq":[{"question":"Where can I buy 5SY4640-8 and how do I get a price?","answer":"This part is sourced to order against an RFQ through independent distribution. Submit a request for quote (RFQ) to confirm current availability and pricing — no stock or price figures are published here."},{"question":"When sourcing 5SY4640-8, what's the closest functional second-source — 5SY4140-7?","answer":"The 5SY4140-7 is a 1-pole N-curve breaker from the same SENTRON 5SY family, so it shares the same physical footprint (1 MW width) and environmental ratings, but it is not a functional substitute for the 4-pole D-curve 5SY4640-8. The pole count, trip characteristic, and breaking capacity differ; do not drop one into a panel wired for the other without rewiring."},{"question":"What compliance documentation does this brand provide for 5SY4640-8 (RoHS, REACH, UL, IEC)?","answer":"The 5SY4640-8 is certified to IEC / EN 60898-1, IEC / EN 60947-2, and UL 1077 / CSA C22.2 No. 235. It is halogen-free and silicon-free, which supports RoHS and REACH compliance. Standard Siemens documentation includes a declaration of conformity and material data sheets; request these with your RFQ."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY4640-8","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/5SY4640-8 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}}