{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SL4240-8CC","brand":"Siemens","brandSlug":"siemens","productSlug":"5SL4240-8CC","canonicalUrl":"https://aoctrl.com/siemens/5SL4240-8CC","factsUrl":"https://aoctrl.com/api/mcp/products/5SL4240-8CC","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SL4240-8CC, miniature circuit breaker, 2-pole, D tripping characteristic, 40 A rated current, 10 kA breaking capacity at 400 V AC.","salesMarkdown":"The Siemens SENTRON 5SL4240-8CC is a 2-pole miniature circuit breaker rated 40 A at 400 V AC, with a D tripping characteristic and a 10 kA breaking capacity per EN 60898. The D-curve means it tolerates high inrush currents — typical for motor, transformer, or lighting ballast loads — without nuisance tripping, while still clearing a hard fault within the 10 kA rating. Mounts on a standard DIN rail, occupies 2 modular width units (36 mm wide), and is rated for any mounting position. ## Thermal derating and ambient range Rated 40 A at 30 °C ambient, the breaker derates to 37.89 A at 40 °C, 36.78 A at 45 °C, 35.65 A at 50 °C, and 34.47 A at 55 °C. If your panel ambient runs above 30 °C, size the load to the derated value at that temperature. The operating range spans -40 °C to 75 °C, so it handles cold storage or rooftop enclosures without issue. ## Material and environmental specs Halogen-free and silicon-free construction — relevant for cleanroom or semiconductor-fab environments where outgassing or particle contamination from standard plastics could affect yield. Pollution degree 2, overvoltage category III, and IP20 with connected conductors. Vibration resistance tested to 50 m/s² at 25 to 150 Hz per IEC 60068-2-6, so it holds up on machinery or near rotating equipment. ## Lifecycle and compliance Listed as current production — no end-of-life notice on record. The 5SL4240-8CC carries a 10 kA breaking capacity at 400 V AC per EN 60898, and a maximum 440 V AC for multi-phase operation. The product designation is miniature circuit breaker; the brand is SENTRON. Compliance documentation (RoHS, REACH, UL, IEC) is typically provided with the unit or available on request — confirm at quote time.","metaTitle":"Siemens 5SL4240-8CC SENTRON MCB, 2-pole D 40 A 10 kA","metaDescription":"Siemens SENTRON 5SL4240-8CC miniature circuit breaker, 2-pole, D-curve, 40 A, 10 kA breaking capacity at 400 V AC. Halogen-free, silicon-free. Sourced to order.","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","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":"36.78 A","at 50 °C / rated value":"35.65 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":"D","at DC / rated value / maximum":"72 V","Product Feature / Touch Protection":"Yes","according to EN 60898 / rated value":"10 kA","supply voltage / at AC / rated value":"400 V","Type Of Voltage / Of The Operating Voltage":"AC","with multi-phase operation / at AC / maximum":"440 V","Product Component / Neutral Conductor Switching":"No","with multi-phase operation / at AC / rated value":"440 V","vibration resistance / according to IEC 60068-2-6":"50 m/s² at 25 to 150 Hz"}},"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=130005&mlfb=5SL4240-8CC","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SL4240-8CC/alternatives.json"},"ai":{"faq":[{"question":"What is the depth of the 5SL4240-8CC?","answer":"The depth is 76 mm, with an installation depth of 70 mm."},{"question":"What is the width of the 5SL4240-8CC?","answer":"The width is 36 mm, which corresponds to 2 modular width units on a standard DIN rail."},{"question":"Will the 5SL4240-8CC drop into a panel specified for the 5SL6550-7BB without rewiring?","answer":"Both are 2-pole SENTRON MCBs with the same 36 mm width and DIN-rail mount, so the physical footprint is identical. The 5SL4240-8CC is a D-curve 40 A unit; the 5SL6550-7BB is a different curve/rating — verify the load's inrush and continuous current before swapping."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SL4240-8CC","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/5SL4240-8CC 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}}