{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SP3750-3","brand":"Siemens","brandSlug":"siemens","productSlug":"5SP3750-3","canonicalUrl":"https://aoctrl.com/siemens/5SP3750-3","factsUrl":"https://aoctrl.com/api/mcp/products/5SP3750-3","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON, miniature circuit breaker, 5SP3750-3, 1-pole, 50 A rated at 230 V AC, 25 kA breaking capacity, E tripping characteristic, DIN rail mount.","salesMarkdown":"## What it is and what it does The Siemens 5SP3750-3 is a SENTRON main miniature circuit breaker — a 1-pole, 50 A device rated at 230 V AC with a 25 kA breaking capacity and an E tripping characteristic. That E curve means it's designed for circuits where you need a deliberate time delay before the magnetic trip kicks in, typically protecting transformers, motor starters, or other loads with a high inrush that would nuisance-trip a B or C curve breaker. The 25 kA SCCR at 230 V tells you it can safely interrupt a fault up to that level without welding contacts or cascading the arc upstream — that's the number your panel designer checks for selective coordination. ## Mounting and integration Snaps onto a 35 mm DIN rail per EN 60715. It's 1.5 modular width units wide, so it takes up a slot and a half in the enclosure — plan your rail space accordingly. The terminals accept solid or stranded copper from 2.5 mm² up to 50 mm², with saddle terminals that hold the conductor tight without damaging strands. IP40 with connected conductors, so it's fine inside a panel but not for washdown areas. Pollution degree 3 means it's rated for the conductive dust and humidity you'd find in an industrial control cabinet, not just a clean electrical room. ## Real-world ratings and derating The 50 A rating is at 30 °C ambient. At 40 °C it's 47.5 A, at 45 °C it's 46.25 A, at 50 °C it's 45 A, and at 55 °C it's 43.75 A. If your panel runs hot — and most industrial panels do — you need to factor that derating into your load calculations. The breaker itself is rated for -40 °C to 70 °C ambient, so it'll sit in an unheated warehouse or a hot roof-top enclosure without a problem. Shock-rated at 30 g for 11 ms impacts, which covers most vibration you'd see on a machine base or a conveyor line.","metaTitle":"Siemens 5SP3750-3 SENTRON MCB, 1P 50A 25kA E-Curve","metaDescription":"Siemens 5SP3750-3 SENTRON miniature circuit breaker, 1-pole, 50 A, 25 kA breaking capacity, E tripping characteristic. Active production. Available 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":"5SP3750-3","Height":"128 mm","Maximum":"70 °C","Minimum":"-40 °C","Sealable":"Yes","Rated Value":"25 kA","description":"Main miniature circuit breaker (SHU), 1-pole, E 50, 230/400 V","Solid Maximum":"50 mm²","Solid Minimum":"2.5 mm²","Design Of Pole":"1P","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","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":"1.5","Position Of Power Supply Cord":"Any","Tripping Characteristic Class":"E","supply voltage at AC rated value":"230 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/3f7a7b3fea5482217dc7400448fc2ee8.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=307995&mlfb=5SP3750-3"},"ai":{"faq":[{"question":"What is the breaking capacity of 5SP3750-3?","answer":"The rated breaking capacity is 25 kA at 230 V AC, per EN 60898."},{"question":"Where can I buy 5SP3750-3 and get a price?","answer":"5SP3750-3 is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an inquiry for a firm quote."},{"question":"What is the E tripping characteristic used for?","answer":"The E curve provides a delayed magnetic trip, making it suitable for circuits with high inrush currents like transformers, motor starters, or certain industrial loads where a B or C curve breaker would nuisance-trip."},{"question":"What compliance documentation does Siemens provide for 5SP3750-3?","answer":"The part carries Siemens SENTRON brand documentation. Compliance with relevant IEC and EN standards (EN 60898, IEC 60947-2) is standard for this product line. RoHS, REACH, and UL documentation should be available from the manufacturer upon request."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SP3750-3","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/5SP3750-3 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}}