{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SN6640-7CN","brand":"Siemens","brandSlug":"siemens","productSlug":"5SN6640-7CN","canonicalUrl":"https://aoctrl.com/siemens/5SN6640-7CN","factsUrl":"https://aoctrl.com/api/mcp/products/5SN6640-7CN","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON miniature circuit breaker, 5SN6640-7CN, 40 A, C-curve, 3P+N, 6 kA breaking capacity at 400 V AC per EN 60898, 4-module width.","salesMarkdown":"The Siemens 5SN6640-7CN is a SENTRON miniature circuit breaker rated 40 A with a C-curve trip characteristic, 3P+N four-pole design, and a 6 kA breaking capacity at 400 V AC per EN 60898. The 4-module width (72 mm) matches the standard 4-pole MCB slot — no surprises swapping into a panel laid out for SENTRON or comparable DIN-rail breakers. Solid conductors up to 25 mm² fit the terminals, which covers most 40 A feed circuits. Power loss is 3.3 W per pole in hot operating state at rated current — about 13.2 W total for all four poles. That's moderate for a 40 A breaker; check your enclosure's thermal derating if packing several breakers side by side. Halogen-free and silicon-free construction, sealable for tamper-proofing. Supplementary devices can be installed (auxiliary contacts, shunt trips, alarm switches) via the accessory slots. Frequency rating is 50/60 Hz; maximum operating voltage is 440 V AC multi-phase.","metaTitle":"Siemens 5SN6640-7CN SENTRON MCB, 40A C-Curve 4P 6kA","metaDescription":"Siemens 5SN6640-7CN SENTRON miniature circuit breaker, 40A, C-curve, 3P+N, 6 kA per EN 60898 at 400 VAC. Current production. Quoted to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"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","Design Of Pole":"3P+N","Number Of Poles":"4","lifecycle_stage":"current","Mounting Position":"any","Installation Depth":"70 mm","Product Brand Name":"SENTRON","Degree Of Pollution":"2","Product Designation":"Miniature circuit breaker","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","Energy Limitation Class":"3","at DC rated value maximum":"72 V","Number Of Modular Width Units":"4","Tripping Characteristic Class":"C","Product Feature Touch Protection":"Yes","supply voltage at AC rated value":"400 V","according to EN 60898 rated value":"6 kA","Supply Voltage Frequency Rated Value":"50 Hz","Influence Of The Surrounding Temperature":"Periodically +55°C, max. 95% humidity","Type Of Voltage Of The Operating Voltage":"AC","with multi-phase operation at AC maximum":"440 V","Value Range Of The Supply Voltage Frequency":"50/60 Hz","with multi-phase operation at AC rated value":"440 V","Product Component Neutral Conductor Switching":"Yes","vibration resistance according to IEC 60068-2-6":"50 m/s² at 25 to 150 Hz","Connectable Conductor Cross-Section Solid Maximum":"25 mm²","Product Extension Installable Supplementary Devices":"Yes","power loss [W] for rated value of the current at AC in hot operating state per pole":"3.3 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=332165&mlfb=5SN6640-7CN","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SN6640-7CN/alternatives.json"},"ai":{"faq":[{"question":"How do I get current pricing and availability for 5SN6640-7CN?","answer":"Submit an RFQ through this listing. Availability and current pricing are confirmed at quote time through independent distribution channels. The part is a standard SENTRON catalog item, so lead times are typically short for active-production breakers."},{"question":"What is the closest functional second-source to 5SN6640-7CN?","answer":"The 5SL4363-7 is the closest peer in the same SENTRON family — also 40 A C-curve, but it is a 3-pole breaker with a 10 kA breaking capacity and no switched neutral. It will not directly replace a 4-pole 5SN6640-7CN without rewiring the neutral circuit and verifying the panel's short-circuit rating."},{"question":"Will 5SN6640-7CN drop into a panel specified around 5SL4363-7?","answer":"No — the 5SN6640-7CN is 4-module wide (72 mm) with a switched neutral pole, while the 5SL4363-7 is 3-module wide (54 mm) without neutral switching. The footprint and wiring differ; you would need to rework the neutral bus and check the available DIN space."},{"question":"What compliance documentation does Siemens provide for 5SN6640-7CN?","answer":"The part carries EN 60898 certification for the 6 kA breaking capacity rating. It is halogen-free and silicon-free. Standard Siemens documentation includes CE declaration of conformity and RoHS/REACH compliance statements available through the product support portal."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SN6640-7CN","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/5SN6640-7CN 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}}