{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY4340-8CC11","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY4340-8CC11","canonicalUrl":"https://aoctrl.com/siemens/5SY4340-8CC11","factsUrl":"https://aoctrl.com/api/mcp/products/5SY4340-8CC11","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY4340-8CC11, 3-pole miniature circuit breaker, 40 A rated AC, D tripping characteristic, 10 kA breaking capacity per EN 60898, 50/60 Hz.","salesMarkdown":"The Siemens 5SY4340-8CC11 is a 3-pole miniature circuit breaker from the SENTRON family, rated 40 A at AC with a D tripping characteristic and a 10 kA breaking capacity per EN 60898. It operates on 50/60 Hz supply and is designed for mechanical engineering and industrial panel applications, including railway equipment (the product designation flags railway suitability). The 40 A rating holds at 35 °C ambient. Above that, the breaker derates: 37.6 A at 40 °C, 36.36 A at 45 °C, 35.04 A at 50 °C, 33.68 A at 55 °C, and 32.28 A at 60 °C. The breaker also accepts ambient humidity up to 95% at 55 °C, tapering to 35% at 75 °C. Both top and bottom terminals accept combined (screw/clamp) conductors. Halogen-free and silicon-free construction, sealable (tamper-evident seal provision). The design references EN 61346-2 and IEC 81346-2 function designation F (protective device). Suitable for railway applications per the product designation. No neutral conductor switching — this is a straight 3-pole overcurrent device.","metaTitle":"Siemens 5SY4340-8CC11 SENTRON MCB, 40A 3P D-curve, 10kA","metaDescription":"Siemens 5SY4340-8CC11 SENTRON miniature circuit breaker, 40A rated AC, 3-pole D-characteristic, 10kA breaking capacity per EN 60898. Active production, available to order.","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":"5SY4340-8CC11","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Miniature circuit breaker 400 V 10kA, 3-pole, D, 40 A for railway applications","Halogen-Free":"Yes","Silicon-Free":"Yes","Design Of Pole":"3P","Number Of Poles":"3","lifecycle_stage":"current","Fastening Method":"Quick assembly system","Mounting Position":"any","Installation Depth":"70 mm","Product Brand Name":"SENTRON","Degree Of Pollution":"3","Product Designation":"Miniature circuit breaker","at AC / rated value":"40 A","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","Combined Terminal Top":"Yes","Design Of The Product":"For railway applications","according to EN 61346-2":"F","at 35 °C / rated value":"40 A","at 40 °C / rated value":"37.6 A","at 45 °C / rated value":"36.36 A","at 50 °C / rated value":"35.04 A","at 55 °C / rated value":"33.68 A","at 60 °C / rated value":"32.28 A","Combined Terminal Bottom":"Yes","according to IEC 81346-2":"F","Suitability For Operation":"Mechanical engineering / industry","Neutral Conductor Switching":"No","Number Of Modular Width Units":"3","Tripping Characteristic Class":"D","Position / Of Power Supply Cord":"Any","according to EN 60898 / rated value":"10 kA","Influence Of The Surrounding Temperature":"max. 95% to 55°C, max. 55% to 70°C, max. 35% to 75°C","Type Of Voltage / Of The Operating Voltage":"AC","Value Range / Of The Supply Voltage Frequency":"50/60 Hz","with multi-phase operation / at AC / rated value":"440 V","operating voltage / at DC / rated value / maximum":"72 V","vibration resistance / according to IEC 60068-2-6":"±1mm at 5 to 25Hz; 50m/s² at 25 to 150Hz","with single-phase operation / at AC / rated value":"440 V","Mechanical Service Life (Switching Cycles) / Typical":"10 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/9036934d7a52a865ed49595011aac16d.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=7188&mlfb=5SY4340-8CC11"},"ai":{"faq":[{"question":"What is the breaking capacity of 5SY4340-8CC11?","answer":"10 kA per EN 60898 at AC. This is the rated short-circuit breaking capacity for the 40 A, 3-pole D-curve configuration."},{"question":"What is the difference between 5SY4340-8CC11 and 5SY7210-7CC?","answer":"The 5SY7210-7CC is a different pole count and rating — it will not drop into the same panel without rewiring. The 5SY4340-8CC11 is a 3-pole 40 A D-curve; the 5SY7210-7CC is a different variant. Verify your BOM line before substituting."},{"question":"Where can I buy 5SY4340-8CC11?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an inquiry for a firm offer."},{"question":"What compliance documentation is available for 5SY4340-8CC11?","answer":"The breaker is halogen-free and silicon-free. It carries design references to EN 61346-2 and IEC 81346-2. Standard Siemens SENTRON documentation (datasheet, CE declaration) applies. Specific RoHS/REACH/UL certificates should be requested at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY4340-8CC11","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/5SY4340-8CC11 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}}