{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY3240-6","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY3240-6","canonicalUrl":"https://aoctrl.com/siemens/5SY3240-6","factsUrl":"https://aoctrl.com/api/mcp/products/5SY3240-6","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY3 series, miniature circuit breaker, 5SY3240-6, 2-pole, 40 A, B characteristic, 4.5 kA (EN 60898), 6 kA (IEC 60947-2), 400 V AC.","salesMarkdown":"The Siemens 5SY3240-6 is a 2-pole miniature circuit breaker from the SENTRON 5SY3 series, rated 40 A at 400 V AC with a B tripping characteristic. Breaking capacity is 4.5 kA per EN 60898 for residential/commercial panels, and 6 kA per IEC 60947-2 for industrial distribution — the higher figure is the one to use when coordinating with upstream switchgear in a plant environment. It also carries a 5 kA rating under UL 1077 and CSA C22.2 No.235, so it's accepted in North American supplementary protection applications. At 36 mm wide (2 width units) and 76 mm deep, it leaves room for wiring in a crowded enclosure. Installation depth is 70 mm, meaning the breaker body sits flush with the rail; the extra 6 mm of overall depth covers the terminal screws and arc chamber. Halogen-free and silicon-free construction — important for panels in clean rooms, semiconductor fabs, or areas where outgassing could contaminate optics or contacts. Humidity tolerance is specified up to 95% at 55 °C, derating to 35% at 75 °C. Energy limiting class 3 means it restricts let-through energy well — good for protecting downstream equipment during a fault.","metaTitle":"Siemens 5SY3240-6 SENTRON MCB, 40A 2P B-Curve, 4.5kA","metaDescription":"Siemens 5SY3240-6 SENTRON miniature circuit breaker, 40 A, 2-pole, B characteristic, 4.5 kA (EN 60898) / 6 kA (IEC 60947-2). Current lifecycle stage. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"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 ... +55 °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","Energy limiting class":"3","Number of width units":"2","Number of poles / Note":"2P","acc. to DIN EN 61346-2":"F","acc. to DIN EN 81346-2":"F","Combined Terminal Bottom":"Yes","circuit-breaker / Design":"5SY3","Current / at AC / rated value":"40 A","Tripping characteristic class":"B","at DC / rated value / maximum":"72 V","acc. to EN 60898 / rated value":"4.5 kA","Position / of power supply cord":"Any","acc. to IEC 60947-2 / rated value":"6 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 DC / acc. to IEC 60947-2 / rated value":"15 kA","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","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":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=384448&mlfb=5SY3240-6","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SY3240-6/alternatives.json"},"ai":{"faq":[{"question":"What is the breaking capacity of 5SY3240-6?","answer":"4.5 kA per EN 60898 for residential/commercial use, 6 kA per IEC 60947-2 for industrial distribution, and 5 kA under UL 1077 / CSA C22.2 No.235 for North American supplementary protection. At DC it's rated 15 kA per IEC 60947-2 up to 72 V."},{"question":"Will 5SY3240-6 drop into a panel specified around 5SY3132-6?","answer":"Mechanically yes — same 36 mm width, same DIN-rail mounting, same terminal range. The difference is rating: 5SY3132-6 is a 32 A single-pole, while this is a 40 A 2-pole. If the panel was wired for single-pole and 32 A, you'd need to re-evaluate the circuit protection and possibly the busbar arrangement."},{"question":"Where can I buy 5SY3240-6?","answer":"Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY3240-6","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/5SY3240-6 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}}