{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY4340-6CC11","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY4340-6CC11","canonicalUrl":"https://aoctrl.com/siemens/5SY4340-6CC11","factsUrl":"https://aoctrl.com/api/mcp/products/5SY4340-6CC11","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON miniature circuit breaker, 5SY4340-6CC11, 3-pole, 40 A rated current, B tripping characteristic, 10 kA breaking capacity at 400 V AC.","salesMarkdown":"The Siemens 5SY4340-6CC11 is a 3-pole SENTRON miniature circuit breaker rated 40 A with a B tripping characteristic and a 10 kA breaking capacity per EN 60898 at 400 V AC. It snaps onto a DIN rail (quick assembly system) and occupies 3 width units (54 mm) — standard panel real estate for a 3P breaker. The B-curve (tripping characteristic class B) means the magnetic trip activates at 3 to 5 times rated current — so between 120 A and 200 A for this 40 A unit. The 10 kA breaking capacity at 400 V AC (per EN 60898) tells you this breaker can safely interrupt a fault current up to 10,000 A without welding its contacts or cascading damage upstream. That's sufficient for most secondary distribution boards fed by a transformer of typical impedance. Rated for 50/60 Hz operation, the 5SY4340-6CC11 also carries a maximum DC voltage rating of 72 V — useful if the same panel has a DC bus or control voltage that needs branch protection, though the AC rating is the primary spec. ## Termination and mounting details","metaTitle":"Siemens 5SY4340-6CC11 SENTRON MCB, 40A B-Curve, 10kA, 3-Pole","metaDescription":"Siemens 5SY4340-6CC11 SENTRON miniature circuit breaker, 40 A rated, B tripping characteristic, 10 kA breaking capacity per EN 60898, 3-pole, 400 V AC. Sourced to order against RFQ","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["3-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Solid":"0.75 ... 35 mm²","Width":"54 mm","title":"5SY4340-6CC11","Height":"90 mm","Sealable":"Yes","Stranded":"0.75 ... 35 mm²","Rated Value":"50/60 Hz","description":"Miniature circuit breaker 400 V 10kA, 3-pole, B, 40 A for railway applications","Halogen-Free":"Yes","Silicon-Free":"Yes","Mounting type":"Quick assembly system","During Storage":"-40 ... +75 °C","Number of poles":"3","Type of voltage":"AC","lifecycle_stage":"current","Mounting position":"any","Installation depth":"70 mm","Product brand name":"SENTRON","Ambient temperature":"-40 ... +70 °C","Product designation":"Miniature circuit breaker","Protection class IP":"IP20, with connected conductors","at AC / rated value":"400 V","Overvoltage category":"III","Combined Terminal Top":"Yes","Design of the product":"For railway applications","Energy limiting class":"3","Number of width units":"3","Number of poles / Note":"3P","acc. to DIN EN 61346-2":"F","acc. to DIN EN 81346-2":"F","Combined Terminal Bottom":"Yes","Suitability for operation":"Mechanical engineering / industry","Current / at AC / rated value":"40 A","Tripping characteristic class":"B","at DC / rated value / maximum":"72 V","acc. to EN 60898 / rated value":"10 kA","Position / of power supply cord":"Any","Product feature / Touch protection":"Yes","Influence of the surrounding temperature":"max. 95% to 55°C, max. 55% to 70°C, max. 35% to 75°C","Tightening torque / with screw-type terminals":"2.5 ... 3.5 N·m","Product function / neutral conductor switching":"No","with multi-phase operation / at AC / rated value":"440 V","with single-phase operation / at AC / rated value":"440 V","Mechanical service life (switching cycles) / typical":"10 000","Tightening torque [lbf·in] / with screw-type terminals":"22 ... 31 lbf·in"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/7ed33c1689bad0340ebb0aa046e02b72.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=18059&mlfb=5SY4340-6CC11"},"ai":{"faq":[{"question":"How do I get current pricing and availability for 5SY4340-6CC11?","answer":"Submit an RFQ through this listing. Pricing and stock are confirmed at quote time through our independent distribution network; we do not publish live prices or counts on the page."},{"question":"Will 5SY4340-6CC11 drop into a panel specified around 5SY6613-8 without rewiring?","answer":"No — the 5SY6613-8 is a different pole count and rating class. The 5SY4340-6CC11 is a 3-pole 40 A B-curve breaker; the 5SY6613-8 is a different variant. Check the pole count, current rating, and tripping characteristic on your panel schedule before substituting. A direct swap without verifying these parameters is not recommended."},{"question":"What compliance documentation does this brand provide for 5SY4340-6CC11?","answer":"As a Siemens SENTRON product, the 5SY4340-6CC11 carries EN 60898 certification for its 10 kA breaking capacity at 400 V AC. The halogen-free and silicon-free construction supports railway fire-safety compliance. For specific RoHS, REACH, or UL documentation, request the manufacturer's declaration of conformity with your RFQ."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY4340-6CC11","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/5SY4340-6CC11 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}}