{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SJ6140-6","brand":"Siemens","brandSlug":"siemens","productSlug":"5SJ6140-6","canonicalUrl":"https://aoctrl.com/siemens/5SJ6140-6","factsUrl":"https://aoctrl.com/api/mcp/products/5SJ6140-6","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SJ6 series, miniature circuit breaker, 1-pole, B-curve, 40 A, 6 kA breaking capacity per EN 60898, 240 V AC, IP20, 70 mm depth.","salesMarkdown":"The Siemens SENTRON 5SJ6140-6 is a 1-pole miniature circuit breaker (MCB) with a B tripping characteristic, rated 40 A at 240 V AC. The 6 kA breaking capacity per EN 60898 (and IEC 60947-2) tells you it can safely interrupt a fault current up to that level without welding contacts or cascading upstream — sized for residential and light commercial distribution boards where the prospective short-circuit current stays under 6 kA. Wire range accepts solid or stranded conductors from 0.75 to 25 mm², which covers everything from a 1.5 mm² lighting circuit to a 16 mm² feeder. The terminal is sealable (Yes) — useful for utility or metering applications where tamper evidence is required. ## Deployment context Snaps onto standard 35 mm DIN rail (1 width unit = 18 mm). Ambient temperature range -20 to +45 °C covers most indoor panel environments; storage range -40 to +75 °C covers shipping and warehouse extremes.","metaTitle":"Siemens 5SJ6140-6 SENTRON MCB, 1P B 40A 6kA","metaDescription":"Siemens SENTRON 5SJ6140-6 miniature circuit breaker, 1-pole, B-curve, 40 A, 6 kA breaking capacity per EN 60898. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["1-Pole MCB (DIN Rail)"],"specifications":{"Solid":"0.75 ... 25 mm²","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/DC","lifecycle_stage":"current","Mounting position":"any","Installation depth":"70 mm","Product brand name":"SENTRON","Ambient temperature":"-20 ... +45 °C","Product designation":"Miniature circuit breakers","Protection class IP":"IP20, with connected conductors","Overvoltage category":"3","Design of the product":"Miniature circuit breaker 5SJ6","Energy limiting class":"3","Number of width units":"1","Number of poles / Note":"1","circuit-breaker / Design":"5SJ6","Current / at AC / rated value":"40 A","Tripping characteristic class":"B","at DC / rated value / maximum":"60 V","acc. to EN 60898 / rated value":"6 kA","Position / of power supply cord":"Any","acc. to IEC 60947-2 / rated value":"6 kA","Product feature / Touch protection":"Yes","Supply voltage / at AC / rated value":"240 V","Influence of the surrounding temperature":"Periodically +55°C, max. 95% humidity","Insulation voltage / at AC / rated value":"440 V","Vibration resistance / acc. to IEC 60068-2-6":"50m/s² at 25 to 150Hz and 60m/s² at 10 to 150 Hz","with multi-phase operation / at AC / maximum":"440 V","Mechanical service life (switching cycles) / typical":"20 000"}},"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=392931&mlfb=5SJ6140-6","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SJ6140-6/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 5SJ6140-6 and get a price?","answer":"Sourced to order against an RFQ through independent distribution. Submit a request for current pricing and availability."},{"question":"What is the difference between 5SJ6140-6 and 5SL4120-7CC?","answer":"The 5SL4120-7CC is a C-curve 20 A MCB with 10 kA breaking capacity; the 5SJ6140-6 is a B-curve 40 A with 6 kA. Both are 1-pole SENTRON units with the same 70 mm depth and IP20 rating, but the 5SJ6140-6 handles higher continuous current and is better suited for resistive loads, while the 5SL4120-7CC handles higher fault currents and is designed for moderate inrush loads like small motors or transformers."},{"question":"What wire sizes does 5SJ6140-6 accept?","answer":"Solid and stranded conductors from 0.75 to 25 mm². The terminal is sealable for tamper-evident installations."},{"question":"Will 5SJ6140-6 drop into a panel specified around 5SL4120-7CC without rewiring?","answer":"Mechanically yes — both are 1-pole, 1 width unit, 70 mm depth, same DIN-rail mount. But the 5SJ6140-6 is 40 A B-curve versus 20 A C-curve, so the circuit must be rated for 40 A and the load must not exceed B-curve inrush tolerance. Rewiring is not required if the existing conductors are sized for 40 A."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SJ6140-6","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/5SJ6140-6 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}}