{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SP3791-1","brand":"Siemens","brandSlug":"siemens","productSlug":"5SP3791-1","canonicalUrl":"https://aoctrl.com/siemens/5SP3791-1","factsUrl":"https://aoctrl.com/api/mcp/products/5SP3791-1","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON main miniature circuit breaker, 5SP3791-1, 3-pole, 100 A, Class E characteristic, 25 kA breaking capacity at 400 V AC, 50 Hz.","salesMarkdown":"## What this 100 A Class E MCB is for The Siemens 5SP3791-1 is a SENTRON main miniature circuit breaker (SHU) — a selective, 3-pole breaker rated 100 A with a Class E tripping characteristic. It ships pre-assembled on an SHU adapter (5ST1324) with three enclosed locking caps (5ST1323), so it's ready to drop into a panel as a main incoming device. Overvoltage category IV tells you it's rated for the utility-side interface, not just downstream distribution. At 6 modular width units (roughly 108 mm on a 35 mm DIN rail), this breaker takes up more rail space than a standard 3-pole MCB — that's the trade-off for the 100 A continuous rating and the selective Class E curve. The 20 000 mechanical switching cycles are double what you'd see on a typical 10 000-cycle SENTRON MCB like the 5SL4363-7, which tells you it's built for main-switch duty where it cycles daily, not just fault protection. Operating temperature spans -40 to 70 °C, so it's fine in an unheated enclosure or a warm MCC room. IP20 with conductors connected means it's panel-protected — no washdown rating, no outdoor exposure without a weatherproof enclosure. ## Physical integration — DIN rail and enclosure fit Mounts on 35 mm standard DIN rail per EN 60715, or via screw fixing with accessories. The 92 mm enclosure depth is standard for SENTRON main breakers. Saddle terminals are provided — good for terminating larger-gauge incoming cable without lug adapters. The switch position indicator shows green for OFF, red for ON, which speeds up panel walk-downs. Shock-rated to 30 g at 11 ms and vibration-rated to 2 g across 5–150 Hz, so it holds up in industrial environments with rotating machinery nearby.","metaTitle":"Siemens 5SP3791-1 SENTRON MCB, 100 A, 3-Pole, Class E, 25 kA","metaDescription":"Siemens SENTRON 5SP3791-1 main miniature circuit breaker, 100 A, 3-pole, Class E tripping characteristic, 25 kA breaking capacity at 400 V AC. Current lifecycle stage. Sourced to o","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["1-Pole MCB (DIN Rail)"],"specifications":{"Maximum":"70 °C","Minimum":"-40 °C","Sealable":"Yes","Rated Value":"25 kA","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","Product Brand Name":"SENTRON","Degree Of Pollution":"3","Product Designation":"Miniature circuit breaker","acc. to IEC 81346-2":"F","protection class IP":"IP20, with connected conductors","Overvoltage Category":"IV","Design Of The Product":"Main miniature circuit breaker","Number Of Poles / Note":"3P","acc. to DIN EN 61346-2":"F","Depth / Of The Enclosure":"92 mm","Suitability For Operation":"Residential buildings/infrastructure","Number Of Modular Width Units":"6","Tripping Characteristic Class":"E","acc. to EN 60898 / rated value":"25 kA","Position / Of Power Supply Cord":"Any","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","operational current / at AC / rated value":"100 A","Fastening Method / Other Installation / Note":"With accessories on 35 mm standard mounting rail or busbar or screw fixing","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=205484&mlfb=5SP3791-1","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SP3791-1/alternatives.json"},"ai":{"faq":[{"question":"What is the breaking capacity of the 5SP3791-1?","answer":"Rated 25 kA per EN 60898 at 400 V AC, which covers service-entrance fault levels in most commercial and light industrial installations."},{"question":"What does the Class E tripping characteristic mean?","answer":"Class E is a selective (time-delayed) curve — it holds longer than a C or D curve to let downstream breakers clear a fault first, making it suitable as a main incoming breaker in a distribution board."},{"question":"Where can I buy the 5SP3791-1 and how is it quoted?","answer":"Sourced through independent distribution channels; quoted to order against an RFQ. Availability and current pricing are confirmed at quote time — no stock count or lead-time figure can be stated here."},{"question":"Will the 5SP3791-1 fit in a panel designed for a standard 3-pole MCB?","answer":"It occupies 6 modular width units on 35 mm DIN rail — wider than a typical 3-pole MCB (3 units). Verify rail space and enclosure depth (92 mm) before specifying as a drop-in replacement."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SP3791-1","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/5SP3791-1 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}}