{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY6540-8","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY6540-8","canonicalUrl":"https://aoctrl.com/siemens/5SY6540-8","factsUrl":"https://aoctrl.com/api/mcp/products/5SY6540-8","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY6 miniature circuit breaker, order code 5SY6540-8, 40 A rated current, D tripping characteristic, 2-pole (1P+N), breaking capacity 6 kA per EN 60898 and 10 kA per IEC 60947-2.","salesMarkdown":"## Siemens 5SY6540-8 — 40 A D-Curve MCB for Industrial Branch Circuits The Siemens 5SY6540-8 is a SENTRON 5SY6 miniature circuit breaker rated 40 A with a D tripping characteristic, in a 2-pole (1P+N) form factor. At 40 A it handles typical branch circuits feeding several small motors or a single larger drive. Breaking capacity is 6 kA per EN 60898 and 10 kA per IEC 60947-2, with a DC rating of 15 kA per IEC 60947-2 at 72 V DC maximum. For UL 1077 / CSA C22.2 No.235 recognition, the interrupting rating is 5 kA. The neutral pole is switched (1P+N), so this breaker opens both line and neutral on a fault — important for single-phase sub-circuits where an unswitched neutral would leave the circuit live after trip. ## Panel Integration & Environmental Fit IP20 with connected conductors, plus touch protection on the terminals, means it is safe for open-panel installation where only qualified personnel access the enclosure. Sealable with a lead seal for tamper-evident metering or safety circuits. ## Approvals & Compliance Designed to EN 60898 (6 kA) and IEC 60947-2 (10 kA AC, 15 kA DC). Also carries UL 1077 and CSA C22.2 No.235 recognition at 5 kA, 250 V AC single-phase. The product designation per DIN EN 61346-2 and DIN EN 81346-2 is letter F (protective device).","metaTitle":"Siemens 5SY6540-8 SENTRON MCB, 40A D-Curve, 2-Pole 1P+N","metaDescription":"Siemens 5SY6540-8 SENTRON miniature circuit breaker, 40 A rated current, D tripping characteristic, 2-pole 1P+N. Breaking capacity 6 kA (EN 60898) / 10 kA (IEC 60947-2). Current li","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"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","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","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":"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":"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":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=470357&mlfb=5SY6540-8","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SY6540-8/alternatives.json"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY6540-8","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/5SY6540-8 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}}