{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SL6640-8CC","brand":"Siemens","brandSlug":"siemens","productSlug":"5SL6640-8CC","canonicalUrl":"https://aoctrl.com/siemens/5SL6640-8CC","factsUrl":"https://aoctrl.com/api/mcp/products/5SL6640-8CC","rawCanonicalId":null},"summary":{"shortDescription":"Siemens 5SL6640-8CC, miniature circuit breaker, 400 V, 6 kA, 3+N-pole, D-curve, 40 A.","salesMarkdown":"## What it is and what the ratings mean The Siemens 5SL6640-8CC is a 3+N-pole miniature circuit breaker (MCB) rated 40 A with a D tripping characteristic, designed for 400 V AC systems and a 6 kA interrupting capacity. The D-curve means it tolerates high inrush currents — typically 10 to 20 times the rated current before tripping magnetically — making it the right choice for motor, transformer, or welding-equipment branch circuits where the startup surge would nuisance-trip a B- or C-curve breaker. The 6 kA breaking capacity at 400 V is adequate for most commercial and light-industrial distribution boards where the prospective fault current stays under that threshold. ## Panel integration notes Snap-on DIN rail mounting, standard 1-module width per pole — so a 3+N-pole unit occupies four 18 mm spaces on the rail. The 6 kA SCCR at 400 V is the maximum fault the breaker can interrupt without welding contacts or venting arc gas; verify the upstream device's let-through energy coordinates with this rating. For a motor branch circuit, the D-curve's magnetic trip at 400–800 A (10–20× In) avoids nuisance trips during direct-on-line starts while still protecting the cable against short circuits.","metaTitle":"Siemens 5SL6640-8CC Miniature Circuit Breaker, 40 A D-curve,","metaDescription":"Siemens 5SL6640-8CC miniature circuit breaker, 40 A D-curve, 3+N-pole, 400 V, 6 kA interrupting capacity. Active production. RoHS compliant since June 2013. Quoted to order against","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Miniature Circuit Breakers (MCB)"],"specifications":{"Group Code":"P310","Product Group":"3821","Product class":"B: return restricted, please contact your Siemens partner/contact","Quantity Unit":"1 Piece","Product Family":"Basic Devices","lifecycle_stage":"current","Packaging Quantity":"1","Export Control Regulations":"AL : N / ECCN : N","Packaging dimensions (L x W x H)":"Not available","Compliance with the substance restrictions according to RoHS directive":"Since: 01-06-13","REACH Art. 33 Duty to inform according to the current list of candidates":"Reach Information"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/37c0844f4e1ce43b8db4cd3f3ce4ae04.pdf","sourceUrl":"https://sieportal.siemens.com/en-ae/products-services/detail/5SL6640-8CC?tree=CatalogTree","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SL6640-8CC/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy the 5SL6640-8CC and get current pricing?","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."},{"question":"What compliance documentation does Siemens provide for this MCB?","answer":"RoHS compliant since June 2013. REACH candidate-list information is available on request. Export control classification is AL: N / ECCN: N, meaning no special license is required for standard commercial shipments."},{"question":"What do the group code P310 and product group 3821 mean?","answer":"Group code P310 and product group 3821 are Siemens internal classification codes used for catalog organization and ERP filtering — they help identify this as a miniature circuit breaker within the Siemens distribution system."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SL6640-8CC","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/5SL6640-8CC 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}}