{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SP3840-2XX31","brand":"Siemens","brandSlug":"siemens","productSlug":"5SP3840-2XX31","canonicalUrl":"https://aoctrl.com/siemens/5SP3840-2XX31","factsUrl":"https://aoctrl.com/api/mcp/products/5SP3840-2XX31","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SP3 main miniature circuit breaker, 3-pole, 40 A, E tripping characteristic, 25 kA IEC breaking capacity, 400 V AC, 50 Hz, busbar-mount for meter cabinets.","salesMarkdown":"The Siemens 5SP3840-2XX31 is a SENTRON 5SP3 main miniature circuit breaker — the SHU type, three-pole, rated 40 A with an E tripping characteristic. It mounts on a 40-mm busbar system per DIN 43870 Part 2. ## Terminal and integration details Solid and stranded conductors from 2.5 mm² up to 50 mm² are accepted — that's a wide lugging range that covers most meter-panel feeds without needing reducers. The outgoing side uses a spring-loaded terminal, so the load cables get a vibration-resistant grip without retorquing. Infeed is at the box terminal, and the design allows sealing (locking slide, wire seal, cable ties, Antilux) for revenue-meter applications where tamper evidence matters. Storage range goes -40 to +70 °C — that's the shipping and warehousing limit, not the running condition. Shock resistance is 30 g for at least 3 impacts at 11 ms duration; vibration per IEC 60068-2-6 is 2 g over 5 to 150 Hz. Those numbers tell you it holds up to the bumps of transport and occasional seismic events, but it's not a rail-traction or shipboard-rated device. Mechanical life is 20 000 switching cycles typical — enough for a main breaker that operates a few times a year, not a frequent-switching load contactor.","metaTitle":"Siemens 5SP3840-2XX31 SENTRON MCB, 3P 40A E-Curve 25kA","metaDescription":"Siemens 5SP3840-2XX31 SENTRON 5SP3 main miniature circuit breaker, 3-pole, 40 A, E tripping characteristic, 25 kA breaking capacity per EN 60898, 400 V AC, 50 Hz. Quoted to order a","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["1-Pole MCB (DIN Rail)"],"specifications":{"Solid":"2.5 ... 50 mm²","Maximum":"440 V","Minimum":"110 V","Sealable":"Yes","Stranded":"2.5 ... 50 mm²","Rated Value":"25 kA","Mounting type":"Busbar","During Storage":"-40 ... +70 °C","Number of poles":"3","lifecycle_stage":"current","Shock resistance":"30 g, at least 3 impacts, impact duration 11 ms","Product brand name":"SENTRON","Ambient temperature":"-25 ... +55 °C","Product designation":"Miniature circuit breaker","Protection class IP":"IP40, with connected conductors","Overvoltage category":"IV","Design of the product":"Main miniature circuit breaker","Number of width units":"4.5","Infeed at box terminal":"Yes","Number of poles / Note":"3P","acc. to DIN EN 61346-2":"F","acc. to DIN EN 81346-2":"F","Depth / of the enclosure":"76.3 mm","circuit-breaker / Design":"5SP3","Suitability for operation":"Residential buildings/infrastructure","Design of the locking device":"Locking slide with lock, additional wire seal, cable ties and Antilux","Current / at AC / rated value":"40 A","Tripping characteristic class":"E","acc. to EN 60898 / rated value":"25 kA","Position / of power supply cord":"Stipulated by installation in the lower section of the meter panel","Insulation voltage / rated value":"690 V","Supply voltage / at AC / rated value":"400 V","Supply voltage frequency / rated value":"50 Hz","Surge voltage resistance / rated value":"6 kV","Mounting type / other installation / Note":"On 40-mm busbar system in compliance with DIN 43870 Part 2","Outgoing Feeder Via Spring-Loaded Terminal":"Yes","Vibration resistance / acc. to IEC 60068-2-6":"2 g, 20 frequency cycles 5 to 150 to 15 Hz","Display version / for switch position indicator":"OFF = green, ON = red","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=5172&mlfb=5SP3840-2XX31","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SP3840-2XX31/alternatives.json"},"ai":{"faq":[{"question":"What conductor sizes does 5SP3840-2XX31 accept?","answer":"Solid conductors from 2.5 mm² up to 50 mm², and stranded conductors the same range. The outgoing terminal is spring-loaded for vibration resistance."},{"question":"Will 5SP3840-2XX31 drop into a panel specified around 5SL3625-7MB?","answer":"No — the 5SP3840-2XX31 is a busbar-mount main MCB (SHU type) for meter cabinets on a 40 mm DIN 43870 grid, while the 5SL series is a standard DIN-rail mount. They are not footprint-interchangeable without rewiring the mounting system."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SP3840-2XX31","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/5SP3840-2XX31 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}}