{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SP3791","brand":"Siemens","brandSlug":"siemens","productSlug":"5SP3791","canonicalUrl":"https://aoctrl.com/siemens/5SP3791","factsUrl":"https://aoctrl.com/api/mcp/products/5SP3791","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON, selective miniature circuit breaker (SHU), 1-pole, 100 A, 25 kA, tripping characteristic E, 230 V AC, 2 MW, IP20.","salesMarkdown":"## Selective main MCB for high-fault-current panels The E tripping characteristic (short-time-delay magnetic release) is what makes it selective: it holds through the instantaneous trip zone of downstream C- or B-curve breakers, clearing only on sustained overcurrent or a hard fault that exceeds its delayed threshold. Overvoltage category IV (pollution degree 3) confirms it is rated for the utility-side interface, not just downstream branch circuits. The 1-pole form factor occupies 2 modular width units (about 36 mm) on standard DIN rail, so it takes up two adjacent slots in the enclosure. Mechanical life of 20 000 switching cycles is typical for a main breaker that sees infrequent manual operation. Depth of 91 mm (92 mm into the enclosure) and height of 145 mm — verify the enclosure lid clearance, especially if a busbar cover or sealable flap is fitted. Saddle terminals accept copper conductors; the breaker is sealable for utility-lockout compliance.","metaTitle":"Siemens 5SP3791 SENTRON MCB, 1-pole 100 A, 25 kA, E-curve","metaDescription":"Siemens 5SP3791 SENTRON selective miniature circuit breaker, 1-pole, 100 A, 25 kA breaking capacity per EN 60898, E tripping characteristic. 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":{"Depth":"91 mm","Height":"145 mm","Maximum":"70 °C","Minimum":"-40 °C","Sealable":"Yes","Rated Value":"25 kA","Number Of Poles":"1","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","at AC / rated value":"100 A","protection class IP":"IP20, with connected conductors","Overvoltage Category":"IV","Design Of The Product":"Main miniature circuit breaker","acc. to DIN EN 61346-2":"F","Depth / Of The Enclosure":"92 mm","Suitability For Operation":"Residential buildings/infrastructure","Number Of Modular Width Units":"2","Tripping Characteristic Class":"E","acc. to EN 60898 / rated value":"25 kA","Position / Of Power Supply Cord":"Any","supply voltage / at AC / rated value":"230 V","insulation voltage (Ui) / rated value":"690 V","Surge Voltage Resistance / Rated Value":"6 kV","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=462504&mlfb=5SP3791","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SP3791/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy the 5SP3791 and get a price?","answer":"The 5SP3791 is sourced to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm commercial response."},{"question":"What is the 5SP3791's breaking capacity?","answer":"Rated 25 kA per EN 60898 at 230 V AC, with an insulation voltage of 690 V and surge voltage resistance of 6 kV."},{"question":"What does the E tripping characteristic mean?","answer":"The E curve is a selective (short-time-delay) characteristic — it allows downstream C- or B-curve MCBs to clear a fault first, so only the faulted branch trips while the main breaker stays closed. This is the defining feature of the SHU design."},{"question":"Will the 5SP3791 drop into a panel specified for a 5SL6550-7BB?","answer":"No — the 5SP3791 is a 1-pole selective main breaker (100 A, 25 kA, E-curve) in a 2-MW footprint, while the 5SL6550-7BB is a 2-pole standard MCB (50 A, 6 kA, C-curve). They serve different roles in the distribution board and are not form-fit interchangeable."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SP3791","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 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}}