{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SL4540-8","brand":"Siemens","brandSlug":"siemens","productSlug":"5SL4540-8","canonicalUrl":"https://aoctrl.com/siemens/5SL4540-8","factsUrl":"https://aoctrl.com/api/mcp/products/5SL4540-8","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SL4540-8 miniature circuit breaker, 2-pole (1P+N), D tripping characteristic, 40 A rated current, 10 kA breaking capacity per EN 60898, 230 V AC.","salesMarkdown":"The Siemens SENTRON 5SL4540-8 is a 2-pole (1P+N) miniature circuit breaker with a D tripping characteristic, rated 40 A at 30 °C and 230 V AC. Rated current is 40 A at 30 °C ambient. At 40 °C it derates to 37.89 A, at 45 °C to 36.8 A, and at 55 °C to 34.47 A. The 5SL4540-8 occupies 2 modular width units (36 mm) on a DIN rail, with an installation depth of 70 mm and overall depth of 76 mm. Halogen-free and silicon-free construction is noted for environments sensitive to outgassing.","metaTitle":"Siemens 5SL4540-8 SENTRON MCB, 2-Pole D 40 A, 10 kA","metaDescription":"Siemens 5SL4540-8 SENTRON miniature circuit breaker, 2-pole 1P+N, D-curve, 40 A, 10 kA breaking capacity per EN 60898. Sourced to order against RFQ.","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","Halogen-Free":"Yes","Silicon-Free":"Yes","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":"2","Product Designation":"Miniature circuit breaker","acc. to IEC 81346-2":"F","at AC / rated value":"40 A","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","Number Of Poles / Note":"1P+N","acc. to DIN EN 61346-2":"F","Energy Limitation Class":"3","at 30 °C / rated value":"40 A","at 40 °C / rated value":"37.89 A","at 45 °C / rated value":"36.8 A","at 55 °C / rated value":"34.47 A","Suitability For Operation":"Residential buildings/infrastructure","Number Of Modular Width Units":"2","Tripping Characteristic Class":"D","at DC / rated value / maximum":"72 V","acc. to EN 60898 / rated value":"10 kA","acc. to IEC 60947-2 / rated value":"10 kA","Product Feature / Touch Protection":"Yes","supply voltage / at AC / rated value":"230 V","Influence Of The Surrounding Temperature":"+55 °C, max. 95% humidity","Product Function / Neutral Conductor Switching":"Yes","with single-phase operation / at AC / rated value":"250 V","Mechanical Service Life (Operating Cycles) / Typical":"10 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/04a3c0fc2da4fa3c9cc6f0f67b9ed442.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=190168&mlfb=5SL4540-8","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SL4540-8/alternatives.json"},"ai":{"faq":[{"question":"What is the breaking capacity of 5SL4540-8?","answer":"10 kA per both EN 60898 and IEC 60947-2, at 230 V AC."},{"question":"Will 5SL4540-8 drop into a panel specified around 5SL6550-7BB?","answer":"The 5SL4540-8 is a 2-pole (1P+N) D-curve 40 A breaker; the 5SL6550-7BB is a different rating and pole configuration. They share the same SENTRON 5SL family footprint (2 MW, 36 mm wide, DIN rail mount), so the mechanical fit is identical, but the electrical ratings differ — verify the load requirements before substituting."},{"question":"Where can I buy 5SL4540-8?","answer":"Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for your volume."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SL4540-8","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/5SL4540-8 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}}