{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SL4140-8","brand":"Siemens","brandSlug":"siemens","productSlug":"5SL4140-8","canonicalUrl":"https://aoctrl.com/siemens/5SL4140-8","factsUrl":"https://aoctrl.com/api/mcp/products/5SL4140-8","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SL4 series, 5SL4140-8 miniature circuit breaker, 1-pole, D tripping characteristic, 40 A rated current, 10 kA breaking capacity, 400 V AC.","salesMarkdown":"The Siemens 5SL4140-8 is a SENTRON 5SL4-series miniature circuit breaker (MCB) designed for overcurrent and short-circuit protection in residential and infrastructure installations. ## What the D-curve and ratings mean for fit For a 1-pole breaker on a 400 V AC line, the single pole switches the phase; the neutral is not switched (neutral conductor switching: No). The maximum operating voltage for multi-phase operation is 440 V AC, so the breaker can be used on 400/440 V systems without derating the voltage side. The screw terminals accept solid or stranded conductors from 0.75 to 25 mm²; the tightening torque range is 2.5 to 3 N·m. Storage temperature extends from -40 to +75 °C. The overvoltage category is 3, and the energy limiting class is 3. The product is classified per DIN EN 61346-2 and DIN EN 81346-2 as function F (protection).","metaTitle":"Siemens 5SL4140-8 SENTRON MCB, 1P D 40 A, 10 kA, 400 V AC","metaDescription":"Siemens 5SL4140-8 SENTRON miniature circuit breaker, 1-pole, D-curve, 40 A rated, 10 kA breaking capacity per EN 60898 and IEC 60947-2, 400 V AC. Current production. Quoted to orde","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["1-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Solid":"0.75 ... 25 mm²","Width":"18 mm","Height":"90 mm","Sealable":"Yes","Stranded":"0.75 ... 25 mm²","Rated Value":"50 Hz","Halogen-Free":"Yes","Silicon-Free":"Yes","During Storage":"-40 ... +75 °C","Number of poles":"1","Type of voltage":"AC","lifecycle_stage":"current","Mounting position":"any","Installation depth":"70 mm","Product brand name":"SENTRON","Ambient temperature":"-25 ... +55 °C","Product designation":"Miniature circuit breaker","Protection class IP":"IP20, with connected conductors","Overvoltage category":"3","Design of the product":"5SL miniature circuit breakers","Energy limiting class":"3","Number of width units":"1","Number of poles / Note":"1P","acc. to DIN EN 61346-2":"F","acc. to DIN EN 81346-2":"F","circuit-breaker / Design":"5SL4","Suitability for operation":"Residential buildings/infrastructure","Current / at AC / rated value":"40 A","Tripping characteristic class":"D","at DC / rated value / maximum":"60 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":"400 V","Influence of the surrounding temperature":"+55 °C, max. 95% humidity","with multi-phase operation / at AC / maximum":"440 V","Tightening torque / with screw-type terminals":"2.5 ... 3 N·m","Product function / neutral conductor switching":"No","with multi-phase operation / at AC / rated value":"440 V","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/d26f2f63859bc35ff42bd407efc1c902.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=375329&mlfb=5SL4140-8","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SL4140-8/alternatives.json"},"ai":{"faq":[{"question":"What is the breaking capacity of the 5SL4140-8?","answer":"The breaking capacity is 10 kA per both EN 60898 and IEC 60947-2. This means the breaker can safely interrupt fault currents up to 10,000 A without damage or upstream cascading."},{"question":"What conductor sizes does the 5SL4140-8 accept?","answer":"The screw terminals accept solid or stranded conductors from 0.75 mm² up to 25 mm². The recommended tightening torque is 2.5 to 3 N·m."},{"question":"Where can I buy the 5SL4140-8 and how is it quoted?","answer":"The 5SL4140-8 is sourced and quoted to order against an RFQ through independent industrial-automation distribution. Availability and current pricing are confirmed at quote time."},{"question":"Will the 5SL4140-8 drop into a panel designed for the 5SL3120-6MB?","answer":"Both are 1-pole SENTRON 5SL-series MCBs with the same 18 mm width and DIN-rail footprint, so the 5SL4140-8 will physically fit the same rail position. However, the 5SL4140-8 is a 40 A D-curve, while the 5SL3120-6MB is a different rating and characteristic; verify the circuit's required current and trip curve before substitution."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SL4140-8","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/5SL4140-8 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}}