{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SL4240-6","brand":"Siemens","brandSlug":"siemens","productSlug":"5SL4240-6","canonicalUrl":"https://aoctrl.com/siemens/5SL4240-6","factsUrl":"https://aoctrl.com/api/mcp/products/5SL4240-6","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SL4240-6 miniature circuit breaker, 2-pole, B-curve, 40 A rated current, 10 kA breaking capacity at 400 V AC, 2 MW units wide.","salesMarkdown":"The Siemens 5SL4240-6 is a 2-pole SENTRON miniature circuit breaker with a B tripping curve, rated 40 A at 400 V AC and a 10 kA breaking capacity per EN 60898. It also carries a 10 kA rating per IEC 60947-2, covering industrial installations where the standard differs. The part is rated for 40 A at 30 °C ambient but derates to 37.89 A at 40 °C and 34.47 A at 55 °C — a factor to check if the breaker sits in a warm enclosure or near other heat sources. The 2-pole design (2 MW units wide, 36 mm) snaps onto DIN rail in any mounting position, with an installation depth of 70 mm plus the 76 mm overall depth. This MCB is designed for residential buildings and infrastructure — think distribution boards in apartments, offices, or light commercial spaces. The B-curve and 40 A rating suit general-purpose lighting and socket circuits where loads are resistive or slightly inductive. The 2-pole format handles single-phase 230 V or two-wire 400 V line-to-line circuits. The sealable design (tamper-proof cover option) is useful for utility-metered installations.","metaTitle":"Siemens 5SL4240-6 SENTRON MCB, 2-pole B 40 A 10 kA","metaDescription":"Siemens 5SL4240-6 SENTRON miniature circuit breaker, 2-pole, B-curve, 40 A, 10 kA breaking capacity per EN 60898. Active production, sourced to order. Request a quote.","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","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","Halogen-Free":"Yes","Silicon-Free":"Yes","Design Of Pole":"2P","Number Of Poles":"2","lifecycle_stage":"current","Mounting Position":"any","Installation Depth":"70 mm","Product Brand Name":"SENTRON","Degree Of Pollution":"2","Product Designation":"Miniature circuit breaker","at AC / rated value":"40 A","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","Energy Limitation Class":"3","according to EN 61346-2":"F","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","according to IEC 81346-2":"F","Suitability For Operation":"Residential buildings/infrastructure","Number Of Modular Width Units":"2","Tripping Characteristic Class":"B","at DC / rated value / maximum":"72 V","according to EN 60898 / rated value":"10 kA","supply voltage / at AC / rated value":"400 V","according to IEC 60947-2 / rated value":"10 kA","Type Of Voltage / Of The Operating Voltage":"AC","with multi-phase operation / at AC / maximum":"440 V","with multi-phase operation / at AC / rated value":"440 V","Mechanical Service Life (Switching Cycles) / Typical":"10 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/77b3fe62c514fdaf9d52ccbc99f9d87c.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=208562&mlfb=5SL4240-6","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SL4240-6/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional second-source to 5SL4240-6?","answer":"The 5SY6040-6 is a close functional peer — same 2-pole B-curve 40 A rating, but check the breaking capacity rating on your specific variant; the 5SL series is the standard residential line, while 5SY is the industrial/higher-end series. They share the same DIN-rail footprint and modular width, so a panel designed for one can accept the other without rewiring, provided the interrupting rating matches your fault level."},{"question":"Where can I buy 5SL4240-6?","answer":"The 5SL4240-6 is available to order through independent distribution. Submit an RFQ for current pricing and availability — confirmed at quote time."},{"question":"What compliance documentation does Siemens provide for 5SL4240-6?","answer":"The part is halogen-free and silicon-free, and carries the EN 60898 and IEC 60947-2 ratings. Standard RoHS and REACH declarations are available from Siemens; check the product documentation for specific certificates per your jurisdiction."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SL4240-6","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/5SL4240-6 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}}