{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SL1140-7MB","brand":"Siemens","brandSlug":"siemens","productSlug":"5SL1140-7MB","canonicalUrl":"https://aoctrl.com/siemens/5SL1140-7MB","factsUrl":"https://aoctrl.com/api/mcp/products/5SL1140-7MB","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SL1140-7MB, miniature circuit breaker, 1-pole, C tripping characteristic, 40 A rated at 230/400 V AC, 3 kA breaking capacity per IEC 60947-2, 1 MW unit, IP20.","salesMarkdown":"## What this 40 A C-curve MCB does in the panel The Siemens 5SL1140-7MB is a 1-pole miniature circuit breaker from the SENTRON family, rated 40 A at 230/400 V AC with a C tripping characteristic. Breaking capacity is 3 kA per IEC 60947-2, which covers most building-level fault currents; if your panel's prospective short-circuit current exceeds that, step up to the 10 kA variants in the same 5SL family. Rated for any mounting position, which simplifies layout in tight sub-distribution boards. ## Thermal and environmental limits Ambient temperature range is -40 to 75 °C, so it's fine for unheated utility rooms or outdoor-adjacent enclosures in temperate climates. Pollution degree 2 (normal, non-conductive) and overvoltage category III (fixed installation) are standard for this class. IP20 with connected conductors — no washdown rating, so keep it inside the panel, not on the machine frame.","metaTitle":"Siemens 5SL1140-7MB SENTRON MCB, 1P C-Curve 40A, 3kA","metaDescription":"Siemens 5SL1140-7MB SENTRON miniature circuit breaker, 1-pole, C-curve, 40A rated at 230/400V AC, 3kA breaking capacity per IEC 60947-2. Active production, sourced 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":"18 mm","title":"5SL1140-7MB","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Circuit breaker 230/400V 3kA, 1pole, C, 40A","Halogen-Free":"Yes","Silicon-Free":"Yes","Design Of Pole":"1P","Number Of Poles":"1","lifecycle_stage":"current","Mounting Position":"any","at AC rated value":"40 A","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","at 30 °C rated value":"40 A","Suitability For Operation":"Residential buildings/infrastructure","at DC rated value maximum":"72 V","Number Of Modular Width Units":"1","Tripping Characteristic Class":"C","supply voltage at AC rated value":"230 V","according to IEC 60947-2 rated value":"3 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":"253 V","Mechanical Service Life (Operating Cycles) Typical":"4 000","power loss [W] for rated value of the current at AC in hot operating state per pole":"4 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/0fa8be5527bd852ff8bdca8d702266ba.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=1046710&mlfb=5SL1140-7MB"},"ai":{"faq":[{"question":"What is the breaking capacity of the 5SL1140-7MB?","answer":"Rated breaking capacity is 3 kA according to IEC 60947-2 at 230/400 V AC. For higher fault-current applications (e.g., 6 kA or 10 kA), look at the 5SL6 or 5SL4 series variants with the same C-curve and pole count."},{"question":"What is the 5SL1140-7MB's width in modular units?","answer":"It occupies 1 modular width unit (18 mm), so it takes exactly one slot on a standard DIN rail. This matches the 1-pole design — no space wasted."},{"question":"Where can I buy the 5SL1140-7MB?","answer":"Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — no stock count or lead-time number is published here, but we can provide a firm quote on request."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SL1140-7MB","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/5SL1140-7MB 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}}