{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SJ6540-7FC","brand":"Siemens","brandSlug":"siemens","productSlug":"5SJ6540-7FC","canonicalUrl":"https://aoctrl.com/siemens/5SJ6540-7FC","factsUrl":"https://aoctrl.com/api/mcp/products/5SJ6540-7FC","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON miniature circuit breaker, 1P+N, C-curve, 40 A, 6 kA per EN 60898, 230 V AC, 2 MW, IP20, sealable, halogen-free.","salesMarkdown":"## What it is and what it does The Siemens 5SJ6540-7FC is a SENTRON miniature circuit breaker (MCB) with a 1P+N pole design — it switches the live conductor and disconnects the neutral, so you get full isolation on a single-module-width footprint. Rated 40 A with a C tripping characteristic, it handles the inrush from motor starters and lighting ballasts without nuisance trips, while still clearing overloads and short circuits up to 6 kA per EN 60898. That 6 kA rating is the breaking capacity at 230 V AC — enough for most residential and light commercial distribution boards where the prospective fault current stays under that threshold. ## Fit and panel integration This MCB snaps onto a standard DIN rail (mounting position any, so you can orient it vertically or horizontally in the enclosure). It occupies 2 modular width units (36 mm wide), with a depth of 76 mm and an installation depth of 70 mm — that's the dimension from the DIN rail to the front face, so check your enclosure depth if you're retrofitting into a shallow gland plate. IP20 with connected conductors means it's protected against finger contact but not washdown; keep it inside a sealed distribution board. Sealable design lets you lock the toggle position with a padlock for lockout/tagout.","metaTitle":"Siemens 5SJ6540-7FC SENTRON MCB, 1P+N, C-Curve, 40A, 6kA","metaDescription":"Siemens 5SJ6540-7FC SENTRON miniature circuit breaker, 1P+N, C-curve, 40 A, 6 kA breaking capacity per EN 60898. Active production. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["1-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Width":"36 mm","title":"5SJ6540-7FC","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Miniature Circuit Breaker 6KA, 1+N-pole, C, 40A","Halogen-Free":"Yes","Silicon-Free":"Yes","Design Of Pole":"1P+N","Number Of Poles":"2","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","Suitability For Operation":"Residential buildings/infrastructure","at DC rated value maximum":"72 V","Number Of Modular Width Units":"2","Tripping Characteristic Class":"C","supply voltage at AC rated value":"230 V","according to EN 60898 rated value":"6 kA","Type Of Voltage Of The Operating Voltage":"AC","Value Range Of The Supply Voltage Frequency":"50/60 Hz","with single-phase operation at AC rated value":"250 V","Mechanical Service Life (Operating Cycles) Typical":"10 000","Product Extension Installable Supplementary Devices":"No"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/86a37317c9db9619243e40bad9fa6052.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=1502734&mlfb=5SJ6540-7FC"},"ai":{"faq":[{"question":"What is the breaking capacity of 5SJ6540-7FC?","answer":"6 kA according to EN 60898 at 230 V AC. That's the maximum fault current it can safely interrupt under standard test conditions."},{"question":"Will 5SJ6540-7FC drop into a panel specified around 5SL4363-7 without rewiring?","answer":"Not directly — the 5SL4363-7 is a 3-pole (3P) MCB with a 54 mm width, while the 5SJ6540-7FC is 1P+N at 36 mm. The DIN-rail mounting is the same, but the pole count and busbar arrangement differ; you'd need to rewire the circuit and adjust the busbar."},{"question":"What compliance documentation does Siemens provide for 5SJ6540-7FC?","answer":"The MCB carries a CE mark for the European market and is designed to EN 60898. It is halogen-free and silicon-free, which matters for clean-room or high-reliability installations. Specific RoHS/REACH declarations are available from Siemens on request."},{"question":"Where can I buy 5SJ6540-7FC and how is it quoted?","answer":"This part is sourced to order through independent distribution. Submit an RFQ for current pricing and availability — confirmed at quote time. No minimum order quantity is stated."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SJ6540-7FC","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/5SJ6540-7FC 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}}