{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY8240-7","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY8240-7","canonicalUrl":"https://aoctrl.com/siemens/5SY8240-7","factsUrl":"https://aoctrl.com/api/mcp/products/5SY8240-7","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON miniature circuit breaker, 5SY8240-7, 2-pole, C tripping characteristic, 25 kA breaking capacity at 400 V AC per IEC 60947-2, 36 mm wide, IP20.","salesMarkdown":"Rated for 400 V AC (60 V DC per pole), it delivers a 25 kA breaking capacity per IEC 60947-2 at 400 V AC — enough to handle high-fault-current industrial feeds. Under UL 1077 it's rated 5 kA, so it qualifies as a supplementary protector for North American panels. The DC rating drops to 15 kA at 60 V, which covers most control-circuit DC buses. The 15 kA DC rating at 60 V covers most 24 V and 48 V DC control circuits, but note the 72 V DC maximum operating voltage — don't exceed that on a DC bus. Vibration resistance per IEC 60068-2-6 covers ±1 mm at 5–25 Hz and 50 m/s² at 25–150 Hz, so it's fine on machine-mounted panels near conveyors or compressors. Temperature range spans -40 °C to 75 °C, with humidity derating: 95% RH up to 55 °C, 55% RH at 70 °C, 35% RH at 75 °C. That's broad enough for unheated outdoor cabinets in cold climates or near hot machinery. The sealable option allows locking the handle in the OFF position for lockout/tagout compliance. Designed to IEC / EN 60947-2 and UL 1077, plus CSA C22.2 No. 235.","metaTitle":"Siemens SENTRON 5SY8240-7 MCB, 2P C-curve, 25 kA IEC","metaDescription":"Siemens SENTRON 5SY8240-7 miniature circuit breaker, 2-pole, C characteristic, 25 kA breaking capacity per IEC 60947-2. Active production. Sourced 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","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","Standard":"IEC / EN 60947-2 / UL1077","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":"400 V","at DC rated value":"60 V","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","Combined Terminal Bottom":"Yes","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":"C","according to IEC 60947-2 rated value":"25 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 (Operating 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":"3.5 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/d76aff0333ad6e814f4cf119247bbf16.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=328900&mlfb=5SY8240-7","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SY8240-7/alternatives.json"},"ai":{"faq":[{"question":"How do I get pricing and availability for 5SY8240-7?","answer":"Submit an RFQ through this listing. Availability and current pricing are confirmed at quote time through independent distribution channels."},{"question":"Will 5SY8240-7 drop into a panel specified for 5SY4140-7?","answer":"Both are 2-pole SENTRON MCBs with the same 36 mm width and DIN-rail mounting, so the footprint is identical. The key difference is breaking capacity: 5SY8240-7 carries 25 kA IEC vs the 5SY4140-7's lower rating. If the panel's fault current exceeds the lower breaker's rating, the 5SY8240-7 is a direct upgrade without rewiring."},{"question":"What compliance documentation is available for 5SY8240-7?","answer":"The part is designed to IEC/EN 60947-2, UL 1077, and CSA C22.2 No. 235. It's halogen-free and silicon-free. Standard Siemens declarations (RoHS, REACH) are available through the manufacturer's documentation portal."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY8240-7","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/5SY8240-7 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}}