{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SL7340-3RC","brand":"Siemens","brandSlug":"siemens","productSlug":"5SL7340-3RC","canonicalUrl":"https://aoctrl.com/siemens/5SL7340-3RC","factsUrl":"https://aoctrl.com/api/mcp/products/5SL7340-3RC","rawCanonicalId":null},"summary":{"shortDescription":"Siemens 5SL7340-3RC, Miniature Circuit Breaker, 40A, 3-pole, K characteristic, 15kA breaking capacity.","salesMarkdown":"## What it is and what the ratings mean The Siemens 5SL7340-3RC is a 3-pole miniature circuit breaker (MCB) rated 40 A with a K characteristic and a 15 kA breaking capacity. The K characteristic means the magnetic trip threshold is 8 to 12 times the rated current — designed for motor and transformer branch circuits where the inrush current is higher than a resistive load but lower than a pure motor-start curve (which would take a D curve). The 15 kA breaking capacity at 400 V tells you this MCB can safely interrupt a fault current up to that level without welding the contacts or cascading the arc upstream — a key spec for coordination studies on a panel fed by a transformer of that fault capability. ## Where it fits Snaps onto standard DIN rail in a distribution board or sub-panel. The 3-pole format handles three-phase circuits (L1, L2, L3) in a single module width per pole. For a panel-builder, the K curve means you can feed a group of small motors or a control transformer without nuisance tripping on inrush, while still providing short-circuit protection downstream.","metaTitle":"Siemens 5SL7340-3RC MCB, 40A 3-pole K char 15kA","metaDescription":"Siemens 5SL7340-3RC miniature circuit breaker, 40A, 3-pole, K characteristic, 15kA breaking capacity. Lifecycle stage current. 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":"5SL7340-3RC","description":"Miniature Circuit Breaker 40A 3-pole K characteristic 15kA","lifecycle_stage":"current"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/38d4fa0967bfde5a636ad7fada7f3017.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=1502425&mlfb=5SL7340-3RC"},"ai":{"faq":[{"question":"What is the breaking capacity of the 5SL7340-3RC?","answer":"The 5SL7340-3RC has a 15 kA breaking capacity, which is the maximum fault current it can safely interrupt at its rated voltage."},{"question":"What does the K characteristic mean on this MCB?","answer":"The K characteristic means the magnetic trip threshold is 8 to 12 times the 40 A rated current, making it suitable for motor and transformer branch circuits with moderate inrush."},{"question":"Where can I buy the 5SL7340-3RC?","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/5SL7340-3RC","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/5SL7340-3RC 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}}