{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SL6640-6BB","brand":"Siemens","brandSlug":"siemens","productSlug":"5SL6640-6BB","canonicalUrl":"https://aoctrl.com/siemens/5SL6640-6BB","factsUrl":"https://aoctrl.com/api/mcp/products/5SL6640-6BB","rawCanonicalId":null},"summary":{"shortDescription":"Siemens 5SL6640-6BB miniature circuit breaker, 400 V, 6 kA, 3+N-pole, B-curve, 40 A, Italy version.","salesMarkdown":"The Siemens 5SL6640-6BB is a miniature circuit breaker (MCB) rated 400 V with a 6 kA breaking capacity, 3+N-pole configuration, B-curve trip characteristic, and 40 A current rating — the Italy-version variant. The B-curve means it trips between 3 and 5 times rated current, which suits resistive and general-purpose loads where you want to avoid nuisance trips from moderate inrush. The 6 kA interrupting rating at 400 V is enough for most commercial and light industrial distribution boards; it safely clears a fault up to that level without the arc re-striking inside the enclosure. ## Panel fit and deployment Snaps onto standard DIN rail in the distribution board. The 3+N-pole format (three protected phases plus a switched neutral) is common in Italian and other European-installation practice where the neutral is switched alongside the phases. The 40 A rating and 6 kA breaking capacity fit final sub-circuits feeding lighting, socket outlets, or small HVAC loads in a 400 V three-phase system. The B-curve keeps it from dropping out on transformer inrush or motor starting currents that stay under 5x rated — a good match for resistive or lightly inductive loads.","metaTitle":"Siemens 5SL6640-6BB Miniature Circuit Breaker, 400V 6kA B 40","metaDescription":"Siemens 5SL6640-6BB miniature circuit breaker, 400V, 6kA, 3+N-pole, B-curve, 40A. Current lifecycle stage. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Miniature Circuit Breakers (MCB)"],"specifications":{"title":"5SL6640-6BB","description":"Miniature circuit breaker 400 V 6kA, 3+N-pole, B, 40 A Version Italy","lifecycle_stage":"current"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/37c0844f4e1ce43b8db4cd3f3ce4ae04.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=175789&mlfb=5SL6640-6BB"},"ai":{"faq":[{"question":"What is the 5SL6640-6BB rated for?","answer":"It is a 400 V, 6 kA, 3+N-pole miniature circuit breaker with a B-curve trip characteristic and 40 A rating, Italy version."},{"question":"Where can I buy the 5SL6640-6BB?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SL6640-6BB","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/5SL6640-6BB 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}}