{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SP3725-3","brand":"Siemens","brandSlug":"siemens","productSlug":"5SP3725-3","canonicalUrl":"https://aoctrl.com/siemens/5SP3725-3","factsUrl":"https://aoctrl.com/api/mcp/products/5SP3725-3","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SP3725-3 miniature circuit breaker, 1-pole, E-characteristic, 25 A rated current, 25 kA breaking capacity per EN 60898, 1.5 modular width units.","salesMarkdown":"The Siemens SENTRON 5SP3725-3 is a 1-pole miniature circuit breaker with an E tripping characteristic, rated 25 A at 30 °C and breaking 25 kA per EN 60898. That E-curve means it's designed for motor and transformer protection — it handles inrush without nuisance tripping, unlike a B or C curve that would pop on the first start. That's high for a single-pole device — you'd typically see 10 kA or 15 kA on residential-grade breakers. The 25 kA rating means it's suitable for industrial panelboards with high available fault current, like a main distribution board fed by a large transformer. The E-curve trips magnetically at 10–20× In (250–500 A), which is why it's specified for motor circuits: it ignores the starting surge and only opens on a hard short. Temperature derating is built into the spec: at 40 °C ambient it carries 23.75 A, at 50 °C it's 22.5 A, and at 55 °C it drops to 21.875 A. The 25 A rating is only valid at 30 °C; above that, the thermal element heats up faster and the breaker will trip earlier than the label suggests. Panel builders should treat the 50 °C figure (22.5 A) as the practical continuous rating for a warm enclosure. The 1.5 modular width units (about 27 mm on a DIN rail) is wider than a standard 1-pole MCB (1 MW = 18 mm). That extra space houses the higher breaking capacity internals and the larger terminals — solid/stranded up to 50 mm², minimum 2.5 mm². The saddle terminals and box-terminal infeed make it easier to land larger conductors without wrestling with screw clamps. Shock-rated to 30 g, 11 ms duration, so it holds up in railway or marine auxiliary panels where vibration is a factor. The 76.3 mm depth includes the housing — check enclosure depth if using a shallow gland plate. IP40 with conductors connected, so it's fine inside a panel but not for wet locations. The integrated locking slide accepts a padlock, wire seal, or cable tie for lockout/tagout — no separate accessory needed.","metaTitle":"Siemens 5SP3725-3 SENTRON MCB, 25A 1P E-Curve, 25kA","metaDescription":"Siemens SENTRON 5SP3725-3 miniature circuit breaker, 25A, 1-pole, E-characteristic, 25kA breaking capacity. Current production. Available to order. Request 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":"5SP3725-3","Height":"128 mm","Maximum":"70 °C","Minimum":"-40 °C","Sealable":"Yes","Rated Value":"25 kA","description":"Main miniature circuit breaker (SHU), 1-pole, E 25, 230/400 V","Number Of Poles":"1","Solid / Maximum":"50 mm²","Solid / Minimum":"2.5 mm²","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","Stranded / Maximum":"50 mm²","Stranded / Minimum":"2.5 mm²","Degree Of Pollution":"3","Product Designation":"Miniature circuit breaker","acc. to IEC 81346-2":"F","at AC / rated value":"25 A","protection class IP":"IP40, with connected conductors","Overvoltage Category":"IV","Design Of The Product":"Main miniature circuit breaker","Infeed At Box Terminal":"Yes","Number Of Poles / Note":"1P","acc. to DIN EN 61346-2":"F","at 30 °C / rated value":"25 A","at 40 °C / rated value":"23.75 A","at 45 °C / rated value":"23.125 A","at 50 °C / rated value":"22.5 A","at 55 °C / rated value":"21.875 A","Depth / Of The Enclosure":"76.3 mm","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","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":"230 V","Surge Voltage Resistance / Rated Value":"6 kV","Fastening Method / Other Installation / Note":"On standard mounting rail 35 mm acc. to EN 60715","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,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/f32690165800af67e281ecdc023af779.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=358437&mlfb=5SP3725-3"},"ai":{"faq":[{"question":"What does the E-curve characteristic mean on this MCB?","answer":"The E tripping characteristic provides magnetic trip at 10–20 times rated current (250–500 A for this 25 A breaker). This is designed for motor and transformer circuits where inrush current would nuisance-trip a B or C curve breaker."},{"question":"Will the 5SP3725-3 drop into a panel designed for a standard 1-pole MCB?","answer":"It occupies 1.5 modular width units (about 27 mm) versus the standard 18 mm for a 1-pole breaker. It will physically fit on the same DIN rail, but you need 9 mm extra space per pole. The terminal capacity (up to 50 mm²) is larger than most standard MCBs, so it may require different-sized conductors or lugs."},{"question":"Where can I buy the 5SP3725-3 and what is the lead time?","answer":"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 price and delivery window."},{"question":"What is the depth and height of the 5SP3725-3?","answer":"Depth is 76.3 mm (including the enclosure), height is 128 mm. These dimensions matter for enclosure fit — check against your gland plate clearance and door swing."},{"question":"What compliance documentation does Siemens provide for the 5SP3725-3?","answer":"The MCB carries approvals per EN 60898 and IEC 60947-2, with overvoltage category IV and pollution degree 3. Standard Siemens declarations (CE, UKCA, RoHS, REACH) are available through the Siemens Industry Online Support portal. The product designation per IEC 81346-2 and DIN EN 61346-2 is F."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SP3725-3","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/5SP3725-3 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}}