{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY3240-7","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY3240-7","canonicalUrl":"https://aoctrl.com/siemens/5SY3240-7","factsUrl":"https://aoctrl.com/api/mcp/products/5SY3240-7","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY3 series, 5SY3240-7 miniature circuit breaker, 2-pole, 40 A, C characteristic, 400 V AC, 4.5 kA (EN 60898) / 6 kA (IEC 60947-2).","salesMarkdown":"The Siemens 5SY3240-7 is a 2-pole SENTRON miniature circuit breaker rated 40 A at 400 V AC, with a C tripping characteristic — meaning it handles moderate inrush from motor or lighting loads without nuisance tripping, while still clearing short circuits fast. Breaking capacity is 4.5 kA per EN 60898 and 6 kA per IEC 60947-2, with a DC rating of 15 kA at 72 V (IEC 60947-2) and 5 kA under UL 1077 / CSA C22.2 No.235. That UL/CSA figure matters if the panel needs a recognized branch-circuit protector for North American acceptance. At 36 mm wide (2 width units), 90 mm tall, and 76 mm deep, it snaps onto a standard DIN rail via the quick-assembly system. Terminals accept 0.75 to 35 mm² solid or stranded copper — sized for the full 40 A load without needing to pigtail down to a smaller lug. The breaker is halogen-free and silicon-free, rated for ambient temperatures from -25 °C to +55 °C, and can be stored from -40 °C to +75 °C. IP20 protection applies with conductors connected. Overvoltage category III and energy limiting class 3. It carries touch protection on the terminals.","metaTitle":"Siemens 5SY3240-7 SENTRON MCB, 40A 2P C-Curve, 4.5kA/6kA","metaDescription":"Siemens 5SY3240-7 SENTRON miniature circuit breaker, 40 A, 2-pole, C characteristic, 400 V AC. Breaking capacity 4.5 kA (EN 60898) / 6 kA (IEC 60947-2). Active production, sourced","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":"C","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=298541&mlfb=5SY3240-7","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SY3240-7/alternatives.json"},"ai":{"faq":[{"question":"What is the breaking capacity of 5SY3240-7?","answer":"The breaking capacity is 4.5 kA per EN 60898, 6 kA per IEC 60947-2 at 400 V AC, 15 kA at 72 V DC per IEC 60947-2, and 5 kA per UL 1077 / CSA C22.2 No.235."},{"question":"What wire sizes does the 5SY3240-7 terminal accept?","answer":"The terminals accept 0.75 to 35 mm² solid or stranded copper conductors."},{"question":"Where can I buy the 5SY3240-7?","answer":"The 5SY3240-7 is 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/5SY3240-7","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/5SY3240-7 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}}