{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SP3720-3","brand":"Siemens","brandSlug":"siemens","productSlug":"5SP3720-3","canonicalUrl":"https://aoctrl.com/siemens/5SP3720-3","factsUrl":"https://aoctrl.com/api/mcp/products/5SP3720-3","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SP3720-3, 1-pole miniature circuit breaker, E-trip curve, 25 kA breaking capacity at 230 V AC, DIN rail mount.","salesMarkdown":"The Siemens 5SP3720-3 is a SENTRON main miniature circuit breaker (MCB), single-pole, with an E-trip characteristic. The E-curve (tripping between 10 and 20 times rated current) is a specialty curve for protecting transformers, power supplies, or long cable runs where inrush is higher than a standard C-curve handles. At 1.5 modular width units (roughly 27 mm), it's a bit wider than a standard 1-pole MCB — that extra space houses the higher arc-quenching chamber needed for the 25 kA rating. The enclosure is IP40 with conductors connected, meaning it's splash-proof in a closed panel but not washdown-rated. The 690 V insulation voltage (Ui) and 6 kV surge voltage resistance give it headroom for transient-heavy environments like industrial supply panels. Saddle terminals and infeed-at-box-terminal design mean the line and load can land on the same side, simplifying busbar routing. The integrated locking slide accepts a padlock, wire seal, or cable tie for lockout/tagout compliance. ## Mechanical and environmental Rated for 20,000 mechanical operating cycles — that's typical for an MCB in distribution duty, not a switching contactor. Shock resistance of 30 g (11 ms half-sine, 3 impacts) and vibration resistance per IEC 60068-2-6 (2 g, 5–150 Hz sweep) mean it holds up in transport or seismic zones.","metaTitle":"Siemens 5SP3720-3 SENTRON MCB, 1P, 25kA, E-Curve, 230V","metaDescription":"Siemens 5SP3720-3 SENTRON miniature circuit breaker, 1-pole, 25 kA breaking capacity, E-trip curve, 230 V AC, DIN rail mount. Active 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":"5SP3720-3","Height":"128 mm","Maximum":"70 °C","Minimum":"-40 °C","Sealable":"Yes","Rated Value":"25 kA","description":"Main miniature circuit breaker (SHU), 1-pole, E 20, 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":"DIN 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","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","Depth Of The Enclosure":"76.3 mm","Fastening Method Other":"on DIN rail 35 mm acc. to EN 60715","Infeed At Box Terminal":"Yes","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 (Operating Cycles) Typical":"20 000","power loss [W] for rated value of the current at AC in hot operating state per pole":"6 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/a0572e79677edca761bf598eb2f8ad2c.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=375423&mlfb=5SP3720-3"},"ai":{"faq":[{"question":"Where can I buy 5SP3720-3 and get a price?","answer":"This part is 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 lead time."},{"question":"What is the depth and height of 5SP3720-3?","answer":"Depth is 76.3 mm, height is 128 mm. That's the body dimensions; add a few mm for the toggle and terminal screws."},{"question":"What compliance documentation does Siemens provide for 5SP3720-3?","answer":"The part carries a current lifecycle status and is designed to EN 60898, IEC 60947-2, and UL 489 standards. RoHS, REACH, and CE declarations are standard with the SENTRON series — request them with your RFQ."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SP3720-3","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/5SP3720-3 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}}