{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY6140-8","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY6140-8","canonicalUrl":"https://aoctrl.com/siemens/5SY6140-8","factsUrl":"https://aoctrl.com/api/mcp/products/5SY6140-8","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY6 series, miniature circuit breaker, 1-pole, D tripping characteristic, 40 A rated current, 400 V AC, 6 kA (EN 60898) / 10 kA (IEC 60947-2), 18 mm width, IP20.","salesMarkdown":"## Siemens 5SY6140-8 SENTRON MCB — D-curve 40 A, 1-pole It is designed for 400 V AC circuits and carries a 6 kA breaking capacity per EN 60898, with a higher 10 kA rating under IEC 60947-2. ## Breaking capacity and standards coverage The 5SY6140-8 carries multiple breaking capacity ratings depending on the standard applied: 6 kA per EN 60898 for general household/commercial use, 10 kA per IEC 60947-2 for industrial panel applications, and 5 kA per UL 1077 / CSA C22.2 No.235 for North American supplementary protection. For DC circuits, it is rated at 15 kA per IEC 60947-2 up to 72 V DC. This range of ratings means the same part can be specified across different regulatory jurisdictions — EN, IEC, UL, CSA — without swapping SKUs. ## Physical fit and environmental ratings ## Application context — D-curve for inductive loads The D tripping characteristic (10–20× In magnetic trip) makes this 40 A breaker a natural fit for motor branch circuits, small transformers, welding equipment, and other loads with high magnetizing inrush. It is explicitly suited for mechanical engineering and industrial environments per the manufacturer's designation. The 1-pole format handles single-phase circuits; for three-phase motor loads, three units would be ganged. Touch protection is integrated on the terminals.","metaTitle":"Siemens 5SY6140-8 SENTRON MCB, 1P D 40 A, 6/10 kA","metaDescription":"Siemens 5SY6140-8 SENTRON miniature circuit breaker, 1-pole, D-curve, 40 A, 400 V AC, 6 kA (EN 60898) / 10 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":["1-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Width":"18 mm","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","Rated Value":"50/60 Hz","Halogen-Free":"Yes","Silicon-Free":"Yes","Mounting type":"Quick assembly system","Number of poles":"1","Type of voltage":"AC","lifecycle_stage":"current","Mounting position":"any","Installation depth":"70 mm","Product brand name":"SENTRON","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","Number of width units":"1","Number of poles / Note":"1P","acc. to DIN EN 61346-2":"F","acc. to DIN EN 81346-2":"F","Combined Terminal Bottom":"Yes","circuit-breaker / Design":"5SY6","Suitability for operation":"Mechanical engineering / industry","Current / at AC / rated value":"40 A","Tripping characteristic class":"D","at DC / rated value / maximum":"72 V","acc. to EN 60898 / rated value":"6 kA","Position / of power supply cord":"Any","acc. to IEC 60947-2 / rated value":"10 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","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"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$36.28","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=350279&mlfb=5SY6140-8","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SY6140-8/alternatives.json"},"ai":{"faq":[{"question":"What is the breaking capacity of 5SY6140-8 under different standards?","answer":"The 5SY6140-8 is rated at 6 kA per EN 60898, 10 kA per IEC 60947-2, 5 kA per UL 1077 / CSA C22.2 No.235 for AC circuits, and 15 kA per IEC 60947-2 for DC circuits up to 72 V DC."},{"question":"What are the physical dimensions of 5SY6140-8?","answer":"The 5SY6140-8 measures 18 mm wide, 90 mm high, and 76 mm deep, with a 70 mm installation depth. It occupies 1 width unit on a DIN rail."},{"question":"Where can I buy 5SY6140-8?","answer":"The 5SY6140-8 is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."},{"question":"What compliance documentation is available for 5SY6140-8?","answer":"The breaker carries ratings per EN 60898, IEC 60947-2, UL 1077, and CSA C22.2 No.235. It is halogen-free and silicon-free. Specific RoHS/REACH declarations are typically included with the manufacturer's documentation package."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY6140-8","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/5SY6140-8 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}}