{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SL6440-7MB","brand":"Siemens","brandSlug":"siemens","productSlug":"5SL6440-7MB","canonicalUrl":"https://aoctrl.com/siemens/5SL6440-7MB","factsUrl":"https://aoctrl.com/api/mcp/products/5SL6440-7MB","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SL6440-7MB miniature circuit breaker, 4-pole, C-curve, 40 A, 6 kA breaking capacity per EN 60898 at 400 V AC, 4 modular width units.","salesMarkdown":"The Siemens SENTRON 5SL6440-7MB is a 4-pole miniature circuit breaker (MCB) with a C tripping characteristic, rated 40 A and a breaking capacity of 6 kA per EN 60898 at 400 V AC. Four poles in a single 72 mm wide housing (4 modular width units) — that is 4 x 18 mm per pole, the standard DIN-rail pitch. The sealable design allows panel builders to lock the toggle position after commissioning. ## Sourcing and BOM fit For a panel originally specified around the 3-pole 5SL4363-7, note the width difference: the 4-pole variant takes 72 mm (4 MW) versus 54 mm (3 MW) for the 3-pole, so a DIN-rail section that had room for a 3-pole plus a spare module may need a wider rail or a different layout. The 5SL4363-7 also carries a 10 kA breaking capacity per EN 60898, so if the fault level at the board exceeds 6 kA, the 5SL4363-7 is the correct choice.","metaTitle":"Siemens 5SL6440-7MB SENTRON MCB, 4P C 40A 6kA 400V","metaDescription":"Siemens SENTRON 5SL6440-7MB miniature circuit breaker, 4-pole, C-curve, 40 A, 6 kA per EN 60898 at 400 V AC. Active production, sourced to order. Request a quote.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["4-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Width":"72 mm","title":"5SL6440-7MB","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Miniature circuit breaker 400 V 6kA, 4-pole, C, 40 A","Halogen-Free":"Yes","Silicon-Free":"Yes","Design Of Pole":"4P","Number Of Poles":"4","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","Energy Limitation Class":"3","Suitability For Operation":"Residential buildings/infrastructure","at DC rated value maximum":"72 V","Number Of Modular Width Units":"4","Tripping Characteristic Class":"C","supply voltage at AC rated value":"400 V","according to EN 60898 rated value":"6 kA","Type Of Voltage Of The Operating Voltage":"AC","with multi-phase operation at AC maximum":"440 V","Value Range Of The Supply Voltage Frequency":"50/60 Hz","with multi-phase operation at AC rated value":"440 V","with single-phase operation at AC rated value":"250 V","vibration resistance according to IEC 60068-2-6":"no","Mechanical Service Life (Operating Cycles) Typical":"10 000","Product Extension Installable Supplementary Devices":"Yes","power loss [W] for rated value of the current at AC in hot operating state per pole":"3.3 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/0d39958bdb01b3b38e97409b940d9225.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=215052&mlfb=5SL6440-7MB"},"ai":{"faq":[{"question":"What is the breaking capacity of 5SL6440-7MB?","answer":"6 kA per EN 60898 at 400 V AC. This is the standard breaking capacity for the SENTRON 5SL6 series in this pole/current combination."},{"question":"Will 5SL6440-7MB drop into a panel built for 5SL4363-7?","answer":"Not without a DIN-rail change. The 5SL6440-7MB is 4-pole, 72 mm wide (4 MW), while the 5SL4363-7 is 3-pole, 54 mm wide (3 MW). The depth and height are identical at 76 mm and 90 mm, so the panel depth is compatible, but the rail width needs to accommodate the extra 18 mm."},{"question":"Where can I buy the 5SL6440-7MB?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Submit a request for quote to confirm current availability and pricing."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SL6440-7MB","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/5SL6440-7MB 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}}