{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY7540-7","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY7540-7","canonicalUrl":"https://aoctrl.com/siemens/5SY7540-7","factsUrl":"https://aoctrl.com/api/mcp/products/5SY7540-7","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY7 series, Miniature circuit breaker, 5SY7540-7, 2-pole 1P+N, 40 A, C-curve, 15 kA (EN 60898), 20 kA (IEC 60947-2), 230 V AC.","salesMarkdown":"## Siemens 5SY7540-7 SENTRON MCB — 40 A, C-Curve, 2-Pole 1P+N The Siemens 5SY7540-7 is a 2-pole miniature circuit breaker from the SENTRON 5SY7 series, configured as 1P+N with a 40 A rated current and C tripping characteristic. Rated 230 V AC, with a breaking capacity of 15 kA per EN 60898 and 20 kA per IEC 60947-2, it covers most European industrial installations where fault levels stay under those thresholds. Any mounting position is permitted, and the enclosure carries IP20 protection with conductors connected — standard for enclosed distribution panels. The 5SY7540-7 is rated 15 kA at 230 V AC per EN 60898, and 20 kA per IEC 60947-2. For DC circuits, it breaks 15 kA at 72 V DC per IEC 60947-2. Under UL 1077 and CSA C22.2 No. 235, it carries a 5 kA rating. These figures determine where the breaker sits in a selective coordination study — upstream devices must have a higher or equal kA rating to clear faults before this MCB reaches its limit. For a BOM line that needs this exact order code, submit an RFQ — the supply posture is active, and the part is specified into new and replacement industrial panels.","metaTitle":"Siemens 5SY7540-7 SENTRON MCB, 40A C-Curve 2-Pole 1P+N","metaDescription":"Siemens 5SY7540-7 SENTRON miniature circuit breaker, 40A rated, C tripping characteristic, 2-pole 1P+N, 15 kA (EN 60898) / 20 kA (IEC 60947-2). Current lifecycle stage. Sourced to","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["1-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Width":"36 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":"2","Type of voltage":"AC","lifecycle_stage":"current","Mounting position":"any","Installation depth":"70 mm","Product brand name":"SENTRON","Degree of pollution":"3","Product designation":"Miniature circuit breaker","Protection class IP":"IP20, with connected conductors","at AC / rated value":"230 V","Overvoltage category":"III","Combined Terminal Top":"Yes","Energy limiting class":"3","Number of width units":"2","Number of poles / Note":"1P+N","acc. to DIN EN 61346-2":"F","acc. to DIN EN 81346-2":"F","Combined Terminal Bottom":"Yes","circuit-breaker / Design":"5SY7","Suitability for operation":"Mechanical engineering / industry","Tripping characteristic class":"C","at DC / rated value / maximum":"72 V","acc. to EN 60898 / rated value":"15 kA","Position / of power supply cord":"Any","acc. to IEC 60947-2 / rated value":"20 kA","Product feature / Touch protection":"Yes","Operating current / at AC / rated value":"40 A","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":"Yes","with single-phase operation / at AC / rated value":"250 V","Mechanical service life (switching cycles) / typical":"10 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/e5f73541dce3ae0a8b005fb4ab83c733.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=125306&mlfb=5SY7540-7","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SY7540-7/alternatives.json"},"ai":{"faq":[{"question":"What is the breaking capacity of 5SY7540-7?","answer":"15 kA at 230 V AC per EN 60898, 20 kA per IEC 60947-2, and 15 kA at 72 V DC per IEC 60947-2. Under UL 1077/CSA C22.2 No. 235 it is rated 5 kA."},{"question":"What is the difference between 5SY7540-7 and 5SY4140-7?","answer":"The 5SY4140-7 is a 1-pole MCB (not 1P+N) from the 5SY4 series, while the 5SY7540-7 is a 2-pole 1P+N from the 5SY7 series. The 5SY7540-7 provides switched neutral disconnection and occupies 2 width units (36 mm) versus 1 width unit for the single-pole variant. Both carry 40 A C-curve ratings, but the 5SY7540-7 is the correct choice when the design calls for a 1P+N configuration."},{"question":"Where can I buy 5SY7540-7?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Submit an RFQ for current availability and pricing."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY7540-7","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/5SY7540-7 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}}