{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SL4340-6","brand":"Siemens","brandSlug":"siemens","productSlug":"5SL4340-6","canonicalUrl":"https://aoctrl.com/siemens/5SL4340-6","factsUrl":"https://aoctrl.com/api/mcp/products/5SL4340-6","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SL4340-6, miniature circuit breaker, 3-pole, B characteristic, 40 A, 400 V AC, 10 kA breaking capacity per EN 60898 and IEC 60947-2.","salesMarkdown":"The Siemens 5SL4340-6 is a SENTRON 3-pole miniature circuit breaker rated 40 A with a B tripping characteristic, designed for 400 V AC systems and a 10 kA breaking capacity under both EN 60898 and IEC 60947-2. The B-curve trips between 3 and 5 times rated current (120–200 A for this 40 A unit), making it the right choice for resistive and general-purpose loads where inrush is modest — lighting circuits, socket outlets, small heaters. It is not intended for motor starting or transformer primary protection where higher inrush would nuisance-trip a B-curve; that is what a C or D characteristic handles. Rated for 400 V AC three-phase (440 V max multi-phase) and 50/60 Hz, it covers standard European LV distribution. The 10 kA breaking capacity is the same under both EN 60898 (household-type) and IEC 60947-2 (industrial-type) standards — no derating needed between the two test regimes. Mechanical life rated at 10 000 operating cycles typical. ## Physical fit and integration Sealable, halogen-free, and silicon-free construction — useful for installations requiring low-smoke zero-halogen cabling or where silicone outgassing could contaminate sensitive contacts (e.g., relay or PLC environments).","metaTitle":"Siemens 5SL4340-6 SENTRON MCB, 3P 40A B-curve 10kA","metaDescription":"Siemens 5SL4340-6 SENTRON miniature circuit breaker, 3-pole, 40 A, B characteristic, 10 kA per EN 60898 / IEC 60947-2. Active production. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["3-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Width":"54 mm","title":"5SL4340-6","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Miniature circuit breaker 400 V 10kA, 3-pole, B, 40 A","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","Energy Limitation Class":"3","Suitability For Operation":"Residential buildings/infrastructure","at DC rated value maximum":"72 V","Number Of Modular Width Units":"3","Tripping Characteristic Class":"B","supply voltage at AC rated value":"400 V","according to EN 60898 rated value":"10 kA","according to IEC 60947-2 rated value":"10 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","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":"3.4 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$84.99 – $95.34","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/14bff235354d92c9f23a8ad09209f9ba.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=219278&mlfb=5SL4340-6"},"ai":{"faq":[{"question":"Will 5SL4340-6 drop into a panel specified around 5SL4363-7 without rewiring?","answer":"Yes — the two breakers share identical dimensions (76 mm depth, 54 mm width, 90 mm height), mounting position, and 3-pole form factor. The only functional difference is the tripping characteristic: the 5SL4340-6 is a B-curve (3–5× In), while the 5SL4363-7 is a C-curve (5–10× In). If the panel was designed for a C-curve, swapping to a B-curve may cause nuisance tripping on loads with moderate inrush (small motors, transformers). Check the load type before substituting."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SL4340-6","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/5SL4340-6 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}}