{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SP3850-3","brand":"Siemens","brandSlug":"siemens","productSlug":"5SP3850-3","canonicalUrl":"https://aoctrl.com/siemens/5SP3850-3","factsUrl":"https://aoctrl.com/api/mcp/products/5SP3850-3","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SP3850-3, main miniature circuit breaker, 3-pole, 50 A, E-characteristic, 25 kA at 400 V AC, DIN rail mount.","salesMarkdown":"The Siemens 5SP3850-3 is a 3-pole main miniature circuit breaker from the SENTRON line, rated 50 A at 30 °C with an E tripping characteristic — a delayed curve designed for transformer and motor-start inrush where a standard B or C curve would nuisance-trip. The 25 kA breaking capacity at 400 V AC (EN 60898) means it can safely interrupt a fault current up to that level without upstream cascading, sized for service entrance or sub-distribution in residential and infrastructure panels. It clips onto standard 35 mm DIN rail per EN 60715 and occupies 4.5 modular width units. ## Derating and thermal reality At 40 °C it derates to 47.5 A, at 45 °C to 46.25 A, at 50 °C to 45 A, and at 55 °C to 43.75 A. Saddle terminals accept solid or stranded copper from 2.5 mm² up to 50 mm² — enough for the full 50 A feed without pigtailing. Infeed can land at either the box terminal or the saddle; supply position is arbitrary, which simplifies busbar routing. The integrated locking slide accepts a padlock, wire seal, or cable tie for lockout/tagout. IP40 with conductors connected — fine for a dry indoor enclosure, not for washdown.","metaTitle":"Siemens 5SP3850-3 SENTRON Main MCB, 3P, 50 A, E-Curve, 25 kA","metaDescription":"Siemens 5SP3850-3 SENTRON main miniature circuit breaker, 3-pole, 50 A rated, E tripping characteristic, 25 kA breaking capacity at 400 V AC. Current production, sourced to order.","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":"5SP3850-3","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 50, 400V","Solid Maximum":"50 mm²","Solid Minimum":"2.5 mm²","Design Of Pole":"3P","Number Of Poles":"3","lifecycle_stage":"current","Fastening Method":"standard 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","at AC rated value":"50 A","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","at 30 °C rated value":"50 A","at 40 °C rated value":"47.5 A","at 45 °C rated value":"46.25 A","at 50 °C rated value":"45 A","at 55 °C rated value":"43.75 A","Depth Of The Enclosure":"76.3 mm","Fastening Method Other":"on DIN rail 35 mm acc. to EN 60715","Infeed At Box Terminal":"Yes","according to EN 61346-2":"F","according to IEC 81346-2":"F","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 (Switching Cycles) Typical":"20 000","power loss [W] for rated value of the current at AC in hot operating state per pole":"8 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/e1531df5651df780d9ae841543e9103c.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=213031&mlfb=5SP3850-3"},"ai":{"faq":[{"question":"What does the E tripping characteristic mean?","answer":"The E-curve is a delayed trip characteristic, typically used for main breakers feeding transformer or motor loads where a brief inrush would trip a B or C curve. It allows higher short-duration overloads before opening."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SP3850-3","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/5SP3850-3 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}}