{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SP3840-3","brand":"Siemens","brandSlug":"siemens","productSlug":"5SP3840-3","canonicalUrl":"https://aoctrl.com/siemens/5SP3840-3","factsUrl":"https://aoctrl.com/api/mcp/products/5SP3840-3","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SP3840-3, 3-pole main miniature circuit breaker, E tripping characteristic, 25 kA rated breaking capacity at 400 V AC, 50 Hz, IP40.","salesMarkdown":"## E Characteristic and Application The E tripping characteristic is a selective (time-delayed) curve, designed for main incomer or sub-distribution positions where coordination with downstream MCBs is required. It allows a short delay before tripping on overload, so a fault on a branch circuit clears at the downstream breaker first — keeping the main bus live. This makes the 5SP3840-3 suited for residential building incomers and infrastructure distribution boards, as the manufacturer specifies. At 4.5 modular width units, it occupies about 81 mm of rail space — plan your enclosure fill accordingly. The integrated locking slide accepts a padlock, wire seal, or cable tie for lockout/tagout. Infeed can be at the box terminal from any direction, simplifying busbar routing. IP40 with connected conductors — protected against solid objects over 1 mm, no water ingress protection, so mount inside a weatherproof enclosure for outdoor use. Shock resistance tested to 30 g, 11 ms duration, 3 impacts; vibration per IEC 60068-2-6 at 2 g, 5–150 Hz sweep. Mechanical service life is 20,000 operating cycles typical. Overvoltage category IV and pollution degree 3 — suitable for main distribution boards with high surge exposure.","metaTitle":"Siemens 5SP3840-3 SENTRON MCB, 3P E-Char 25kA 400V","metaDescription":"Siemens 5SP3840-3 SENTRON miniature circuit breaker, 3-pole, E characteristic, 25 kA breaking capacity at 400 V AC. Active production. Quoted to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["1-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76.3 mm","title":"5SP3840-3","Height":"128 mm","Maximum":"70 °C","Minimum":"-40 °C","Sealable":"Yes","Rated Value":"25 kA","description":"Main miniature circuit breaker (SHU), 3x 1-pole, E 40, 400V","Solid Maximum":"50 mm²","Solid Minimum":"2.5 mm²","Design Of Pole":"3P","Number Of Poles":"3","lifecycle_stage":"current","Fastening Method":"DIN rail","Saddle Terminals":"Yes","Shock Resistance":"30 g, at least 3 impacts, impact duration 11 ms","Stranded Maximum":"50 mm²","Stranded Minimum":"2.5 mm²","Product Brand Name":"SENTRON","Degree Of Pollution":"3","Product Designation":"Miniature circuit breaker","protection class IP":"IP40, with connected conductors","Overvoltage Category":"IV","Design Of The Product":"Main miniature circuit breaker","Depth Of The Enclosure":"76.3 mm","Fastening Method Other":"on DIN rail 35 mm acc. to EN 60715","Infeed At Box Terminal":"Yes","Suitability For Operation":"Residential buildings/infrastructure","Design Of The Locking Device":"Integrated locking slide, lockable by means of a lock, wire seal and cable ties","Number Of Modular Width Units":"4.5","Position Of Power Supply Cord":"Any","Tripping Characteristic Class":"E","supply voltage at AC rated value":"400 V","according to EN 60898 rated value":"25 kA","insulation voltage (Ui) rated value":"690 V","Supply Voltage Frequency Rated Value":"50 Hz","Surge Voltage Resistance Rated Value":"6 kV","Display Version For Switch Position Indicator":"OFF = green, ON = red","vibration resistance according to IEC 60068-2-6":"2 g, 20 frequency cycles 5 to 150 to 15 Hz","Mechanical Service Life (Operating Cycles) Typical":"20 000","power loss [W] for rated value of the current at AC in hot operating state per pole":"6.4 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/06b999534fa45b2ed6ef17d328f1474d.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=230129&mlfb=5SP3840-3"},"ai":{"faq":[{"question":"What is the breaking capacity of the 5SP3840-3?","answer":"25 kA at 400 V AC per EN 60898, which is the rated short-circuit breaking capacity for this 3-pole main MCB."},{"question":"What does the E characteristic mean on this MCB?","answer":"The E curve is a selective (time-delayed) tripping characteristic, intended for main incomer or sub-distribution positions to coordinate with downstream breakers and avoid nuisance tripping on branch faults."},{"question":"What wire sizes does the 5SP3840-3 accept?","answer":"Saddle terminals accept solid or stranded copper from 2.5 mm² minimum up to 50 mm² maximum."},{"question":"Where can I buy the 5SP3840-3 and get current pricing?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm commercial offer."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SP3840-3","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/5SP3840-3 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}