{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY8240-8BB08","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY8240-8BB08","canonicalUrl":"https://aoctrl.com/siemens/5SY8240-8BB08","factsUrl":"https://aoctrl.com/api/mcp/products/5SY8240-8BB08","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON, miniature circuit breaker, 2-pole, 40 A, D-characteristic, 25 kA (IEC 60947-2), 400 V AC, IP20, 5SY8240-8BB08.","salesMarkdown":"The Siemens SENTRON 5SY8240-8BB08 is a 2-pole miniature circuit breaker rated at 40 A with a D tripping characteristic, designed for 400 V AC systems. Its 25 kA breaking capacity per IEC 60947-2 handles high-fault industrial feeders, while the 5 kA rating per UL 1077 covers North American branch-circuit applications. Accepts solid or stranded conductors from 0.75 to 35 mm² at the screw terminals, torqued to 2.5–3.5 N·m. IP20 with connected conductors means the busbars and terminations are touch-safe once wired — fine for enclosed industrial panels, not for wet washdown zones.","metaTitle":"Siemens 5SY8240-8BB08 SENTRON MCB, 2P, 40 A, D-curve, 25 kA","metaDescription":"Siemens 5SY8240-8BB08 SENTRON miniature circuit breaker, 2-pole, 40 A, D tripping characteristic, 25 kA IEC breaking capacity, IP20. 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","Solid":"0.75 ... 35 mm²","Width":"36 mm","Height":"90 mm","Sealable":"Yes","Stranded":"0.75 ... 35 mm²","Rated Value":"50/60 Hz","Halogen-Free":"Yes","Silicon-Free":"Yes","Mounting type":"Quick assembly system","During Storage":"-40 ... +75 °C","Number of poles":"2","Type of voltage":"AC","lifecycle_stage":"current","Mounting position":"any","Installation depth":"70 mm","Product brand name":"SENTRON","Ambient temperature":"-25 ... +45 °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":"Only magnetic tripping operation","Number of width units":"2","Number of poles / Note":"2P","acc. to DIN EN 61346-2":"F","Combined Terminal Bottom":"Yes","Suitability for operation":"Mechanical engineering / industry","Current / at AC / rated value":"40 A","Tripping characteristic class":"D","at DC / rated value / maximum":"72 V","Position / of power supply cord":"Any","acc. to IEC 60947-2 / rated value":"25 kA","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","at AC / acc. to UL 1077 and CSA C22.2 No.235":"5 kA","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","AWG number / as coded connectable conductor cross section":"18 ... 4"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/b3c5912ccbff9f9fff5b146b5ed97bfb.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=438227&mlfb=5SY8240-8BB08","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SY8240-8BB08/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 5SY8240-8BB08 and get a price?","answer":"We source this part to order against an RFQ. Availability and current pricing are confirmed at quote time — submit an RFQ through the page."},{"question":"What is the difference between 5SY8240-8BB08 and 5SY3132-6?","answer":"The 5SY3132-6 is a different pole/current combination; the 5SY8240-8BB08 is a 2-pole 40 A D-curve, while the 5SY3132-6 is a 1-pole 32 A C-curve. They share the same SENTRON family and DIN-rail footprint, but the pole count, rating, and trip characteristic differ — verify your BOM before substituting."},{"question":"What compliance documentation does Siemens provide for 5SY8240-8BB08?","answer":"The breaker is rated per IEC 60947-2 (25 kA) and UL 1077 / CSA C22.2 No.235 (5 kA). It is halogen-free and silicon-free, which supports RoHS/REACH compliance declarations from the manufacturer."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY8240-8BB08","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/5SY8240-8BB08 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-09-02T08:15:54.622Z","lastPublished":"2026-09-02T08:15:54.622Z","indexable":true}}