{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SL7140-3RC","brand":"Siemens","brandSlug":"siemens","productSlug":"5SL7140-3RC","canonicalUrl":"https://aoctrl.com/siemens/5SL7140-3RC","factsUrl":"https://aoctrl.com/api/mcp/products/5SL7140-3RC","rawCanonicalId":null},"summary":{"shortDescription":"Siemens 5SL7140-3RC, miniature circuit breaker, 1-pole, 40 A rated current, K characteristic, 15 kA breaking capacity.","salesMarkdown":"The Siemens 5SL7140-3RC is a 1-pole miniature circuit breaker rated at 40 A with a K characteristic and a 15 kA breaking capacity. The K characteristic means the magnetic trip threshold is set between 10 and 14 times the rated current — designed to handle the inrush of motor and transformer loads without nuisance tripping, while still providing short-circuit protection. The 15 kA breaking capacity (Icn) tells you it can safely interrupt a fault current up to that level under standard conditions, which covers most commercial and light industrial distribution boards. The 5SL7140-3RC snaps onto standard DIN rail (EN 60715) in a distribution board or sub-panel. Single-pole format occupies one module width (roughly 18 mm). For a 40 A circuit, verify the upstream conductor sizing and the panel's overall thermal derating — the K characteristic already accounts for motor-start inrush, but the breaker's thermal element responds to ambient temperature inside the enclosure.","metaTitle":"Siemens 5SL7140-3RC MCB 40A 1-pole K char 15kA","metaDescription":"Siemens 5SL7140-3RC miniature circuit breaker, 40A, 1-pole, K characteristic, 15kA breaking capacity. Current lifecycle stage. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["1-Pole MCB (DIN Rail)"],"specifications":{"title":"5SL7140-3RC","description":"Miniature Circuit Breaker 40A 1-pole K characteristic 15kA","lifecycle_stage":"current"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/8941f8514124d98c582e2276ef609f84.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=1502405&mlfb=5SL7140-3RC"},"ai":{"faq":[{"question":"What is the breaking capacity of the 5SL7140-3RC?","answer":"The 5SL7140-3RC has a 15 kA breaking capacity, which is the maximum fault current it can safely interrupt."},{"question":"Where can I buy the 5SL7140-3RC?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution channels. 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/5SL7140-3RC","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/5SL7140-3RC 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}}