{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SL1340-7MB","brand":"Siemens","brandSlug":"siemens","productSlug":"5SL1340-7MB","canonicalUrl":"https://aoctrl.com/siemens/5SL1340-7MB","factsUrl":"https://aoctrl.com/api/mcp/products/5SL1340-7MB","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SL1340-7MB, miniature circuit breaker, 3-pole, C-curve, 40 A, 3 kA breaking capacity per IEC 60947-2, 230/440 V AC, 50/60 Hz.","salesMarkdown":"## Siemens SENTRON 5SL1340-7MB: 40 A, C-Curve, 3-Pole MCB The Siemens SENTRON 5SL1340-7MB is a 3-pole miniature circuit breaker (MCB) with a C-curve trip characteristic, rated for 40 A at 230/440 V AC, 50/60 Hz. Its breaking capacity is 3 kA per IEC 60947-2, sized for residential and infrastructure branch-circuit protection where fault currents stay within that limit. The 3-pole design switches all three phases simultaneously, which is typical for three-phase final sub-circuits in panelboards and distribution boards. The 5SL1340-7MB occupies 3 modular width units (54 mm) on a DIN rail, with a depth of 76 mm and an installation depth of 70 mm. ## Ratings and Application Context Rated 40 A at 230 V single-phase and 440 V multi-phase. Power loss 4 W per pole at rated current. The 72 V DC maximum rating means it can also be used in some DC control circuits, but the primary application is AC branch protection. Mechanical service life is 4,000 operating cycles typical.","metaTitle":"Siemens 5SL1340-7MB SENTRON MCB, 3P C-Curve 40A, 3kA","metaDescription":"Siemens SENTRON 5SL1340-7MB miniature circuit breaker, 3-pole, C-curve, 40 A, 3 kA breaking capacity per IEC 60947-2. Currently in production. Quoted to order against an RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["3-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Width":"54 mm","title":"5SL1340-7MB","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Circuit breaker 230/400V 3kA, 3pole, C, 40A","Halogen-Free":"Yes","Silicon-Free":"Yes","Design Of Pole":"3P","Number Of Poles":"3","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":"3","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/c810781fa6fb669b324e787b6351424e.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=1046750&mlfb=5SL1340-7MB"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SL1340-7MB","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/5SL1340-7MB 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}}