{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY6240-6","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY6240-6","canonicalUrl":"https://aoctrl.com/siemens/5SY6240-6","factsUrl":"https://aoctrl.com/api/mcp/products/5SY6240-6","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY6240-6, 2-pole miniature circuit breaker, 40 A rated current, B tripping characteristic, 6 kA (EN 60898) / 10 kA (IEC 60947-2), 2 MW, IP20.","salesMarkdown":"It protects branch circuits against overload and short-circuit in industrial control panels, distribution boards, and mechanical-engineering installations. Breaking capacity is 6 kA per EN 60898-1 and 10 kA per IEC 60947-2 / UL1077. The higher 10 kA figure applies when the breaker is specified under the industrial standard, which is the relevant one for most panel builders coordinating with upstream devices. ## Ratings and thermal derating The 40 A rating holds at 35 °C ambient. Above that, derate linearly: 37.56 A at 40 °C, 36.28 A at 45 °C, 34.96 A at 50 °C, and 33.6 A at 55 °C. If the panel internal temperature runs at 50 °C, the effective continuous current is just under 35 A — plan the load accordingly. Energy limitation class 3 indicates the breaker limits let-through energy to a level that protects downstream components during a short-circuit, which simplifies coordination in a distribution board. Combined terminal top and bottom accept supply from either side. Neutral conductor is not switched — this is a 2-pole breaker switching both phases (line and load) in a single-phase or split-phase circuit, not a 1P+N device.","metaTitle":"Siemens 5SY6240-6 SENTRON MCB, 2P 40A B-Curve, 6kA/10kA","metaDescription":"Siemens 5SY6240-6 SENTRON miniature circuit breaker, 2-pole 40 A, B characteristic, 6 kA (EN 60898) / 10 kA (IEC 60947-2). Current production. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["2-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Width":"36 mm","title":"5SY6240-6","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","Standard":"IEC / EN 60898-1, IEC / EN 60947-2 / UL1077","description":"Miniature circuit breaker 400 V 6kA, 2-pole, B, 40A, D=70 mm","Halogen-Free":"Yes","Silicon-Free":"Yes","Design Of Pole":"2P","Number Of Poles":"2","lifecycle_stage":"current","Fastening Method":"Quick assembly system","Mounting Position":"any","at AC rated value":"40 A","Installation Depth":"70 mm","Product Brand Name":"SENTRON","Degree Of Pollution":"3","Product Designation":"Miniature circuit breaker","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","Combined Terminal Top":"Yes","at 35 °C rated value":"40 A","at 40 °C rated value":"37.56 A","at 45 °C rated value":"36.28 A","at 50 °C rated value":"34.96 A","at 55 °C rated value":"33.6 A","Energy Limitation Class":"3","according to EN 61346-2":"F","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":"2","Position Of Power Supply Cord":"Any","Tripping Characteristic Class":"B","according to EN 60898 rated value":"6 kA","according to IEC 60947-2 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","at DC according to IEC 60947-2 rated value":"15 kA","Value Range Of The Supply Voltage Frequency":"50/60 Hz","operating voltage at DC rated value maximum":"72 V","with multi-phase operation at AC rated value":"440 V","with single-phase operation at AC rated value":"440 V","at AC according to UL 1077 and CSA C22.2 No.235":"5 kA","vibration resistance according to IEC 60068-2-6":"±1mm at 5 to 25Hz; 50m/s² at 25 to 150Hz","Mechanical Service Life (Switching Cycles) Typical":"10 000","Product Extension Installable Supplementary Devices":"Yes","supply voltage with single-phase operation at AC rated value":"230 V","power loss [W] for rated value of the current at AC in hot operating state per pole":"3.6 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$30.48","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/6e6d0534df0be0a11430bb9cf690f72b.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=238256&mlfb=5SY6240-6"},"ai":{"faq":[{"question":"Where can I buy 5SY6240-6 and how do I get a price?","answer":"Submit an RFQ through this listing. The part is sourced to order; availability and current pricing are confirmed at quote time."},{"question":"What is 5SY6240-6's rated breaking capacity?","answer":"6 kA per EN 60898-1 and 10 kA per IEC 60947-2 / UL1077. The 10 kA rating is the one to use for industrial coordination studies."},{"question":"What compliance documentation does Siemens provide for 5SY6240-6?","answer":"The breaker is certified to IEC / EN 60898-1, IEC / EN 60947-2, and UL1077. It is halogen-free and silicon-free. Full compliance documentation (CE, UKCA, RoHS, REACH) is available from the manufacturer."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY6240-6","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/5SY6240-6 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}}