{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY4240-8","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY4240-8","canonicalUrl":"https://aoctrl.com/siemens/5SY4240-8","factsUrl":"https://aoctrl.com/api/mcp/products/5SY4240-8","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY4240-8, D-curve miniature circuit breaker, 2-pole, 400 V AC / 72 V DC, 10 kA per EN 60898-1, 15 kA per IEC 60947-2.","salesMarkdown":"The 5SY4240-8: The breaker occupies 2 modular width units (36 mm) with a 70 mm installation depth (76 mm overall depth for finger-safe terminals). Panel designers can count on a compact footprint for DIN-rail layouts, and the quick-assembly system speeds mounting. Acceptable in any mounting position. Ambient range from -40 °C to 75 °C covers most indoor enclosures, with relative humidity limits decreasing above 55 °C (95 % RH at 55 °C down to 35 % at 75 °C). Vibration resistance per IEC 60068-2-6: 5 to 25 Hz at ±1 mm, 25 to 150 Hz at 50 m/s², so it holds up in machine-tool panels. Sealable terminals allow lockout/tagout compliance. Designed to IEC/EN 60898-1 and IEC/EN 60947-2, with UL 1077 recognition for the AC rating (5 kA per UL 1077). Combined terminal top and bottom accept standard busbar or wire connections, with neutral conductor switching not integrated (external switching required for full isolation).","metaTitle":"Siemens 5SY4240-8 SENTRON MCB, D Curve, 2P, 400V","metaDescription":"Siemens 5SY4240-8 miniature circuit breaker, D tripping characteristic, 2 pole, rated 400 V AC / 72 V DC, 10 kA (EN) / 15 kA (IEC). Current production. Sourced to order against RFQ","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":"5SY4240-8","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 10kA, 2-pole, D, 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":"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":"D","according to EN 60898 rated value":"10 kA","according to IEC 60947-2 rated value":"15 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 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$169.84","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/2cf83cf33a9a8f699cc1293bcdb7a05d.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=505094&mlfb=5SY4240-8"},"ai":{"faq":[{"question":"What standards does the 5SY4240-8 comply with?","answer":"The breaker is designed to IEC/EN 60898-1, IEC/EN 60947-2, and UL 1077. It is also halogen-free and silicon-free, suitable for applications requiring those material restrictions."},{"question":"What are the physical dimensions of the 5SY4240-8?","answer":"Width is 36 mm (2 modular width units), height is 90 mm, overall depth is 76 mm, and installation depth is 70 mm."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY4240-8","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/5SY4240-8 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}}