{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY4640-6","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY4640-6","canonicalUrl":"https://aoctrl.com/siemens/5SY4640-6","factsUrl":"https://aoctrl.com/api/mcp/products/5SY4640-6","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY4640-6, miniature circuit breaker, 4-pole (3P+N), 40 A rated, B tripping characteristic, 10 kA breaking capacity per EN 60898, 15 kA per IEC 60947-2.","salesMarkdown":"No nuisance tripping on motor starts; that's what C or D curves handle. The 40 A rating holds at 35 °C ambient; it derates to 38.4 A at 40 °C, 37.6 A at 45 °C, 36.76 A at 50 °C, 35.92 A at 55 °C, and 35.04 A at 60 °C. That thermal curve is what the panel builder needs for fill-factor calculations inside a sealed enclosure — don't load the breaker to 40 A if the cabinet runs at 50 °C. Mounting position is any orientation, so it fits tight sub-distribution boards where vertical or horizontal rail layouts are used. Neutral conductor is switched (3P+N), which means the neutral pole opens and closes with the phases — required in some industrial specs to isolate the circuit completely. Rated to IEC / EN 60898-1 and IEC / EN 60947-2, plus UL1077. That dual rating covers both residential-style MCB applications (EN 60898) and industrial circuit-breaker duty (IEC 60947-2) — the same part works in a UL 508A panel and a European-style distribution board. The sealable option (padlockable toggle) lets maintenance lock the breaker in the off position for LOTO procedures.","metaTitle":"Siemens 5SY4640-6 SENTRON MCB, 40A B-Curve 4-Pole 10kA","metaDescription":"Siemens 5SY4640-6 SENTRON miniature circuit breaker, 40A rated, B characteristic, 4-pole (3P+N), 10kA breaking capacity per EN 60898. Active production, sourced to order. Request a","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":"5SY4640-6","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, B, 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","Installation Depth":"70 mm","Product Brand Name":"SENTRON","Degree Of Pollution":"3","Product Designation":"Miniature circuit breaker","at AC / rated value":"40 A","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","Combined Terminal Top":"Yes","Energy Limitation Class":"3","according to EN 61346-2":"F","at 35 °C / rated value":"40 A","at 40 °C / rated value":"38.4 A","at 45 °C / rated value":"37.6 A","at 50 °C / rated value":"36.76 A","at 55 °C / rated value":"35.92 A","at 60 °C / rated value":"35.04 A","Combined Terminal Bottom":"Yes","according to IEC 81346-2":"F","Suitability For Operation":"Mechanical engineering / industry","Neutral Conductor Switching":"Yes","Number Of Modular Width Units":"4","Tripping Characteristic Class":"B","Position / Of Power Supply Cord":"Any","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","Value Range / Of The Supply Voltage Frequency":"50/60 Hz","at DC / according to IEC 60947-2 / rated value":"15 kA","with multi-phase operation / at AC / rated value":"440 V","operating voltage / at DC / rated value / maximum":"72 V","vibration resistance / according to IEC 60068-2-6":"±1mm at 5 to 25Hz; 50m/s² at 25 to 150Hz","with single-phase operation / at AC / rated value":"440 V","Mechanical Service Life (Switching Cycles) / Typical":"10 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/840026a1199e2a9726d137d5f24b8659.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=376139&mlfb=5SY4640-6"},"ai":{"faq":[{"question":"What is the breaking capacity of 5SY4640-6?","answer":"10 kA per EN 60898 and 15 kA per IEC 60947-2. The higher figure under the industrial standard gives headroom for fault-current coordination in an industrial panel."},{"question":"What is the B-curve tripping characteristic used for?","answer":"The B-curve trips at 3 to 5 times rated current, so it's suited for resistive and general-purpose loads with low inrush — lighting, heaters, control transformers. It avoids nuisance trips on those loads while still protecting the wiring."},{"question":"Where can I buy 5SY4640-6 and how is it quoted?","answer":"Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm price and lead time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY4640-6","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/5SY4640-6 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}}