{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SP3740-2","brand":"Siemens","brandSlug":"siemens","productSlug":"5SP3740-2","canonicalUrl":"https://aoctrl.com/siemens/5SP3740-2","factsUrl":"https://aoctrl.com/api/mcp/products/5SP3740-2","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON, main miniature circuit breaker, 5SP3740-2, 1-pole 40 A, Class E tripping characteristic, 25 kA breaking capacity per EN 60898, 230 V AC.","salesMarkdown":"## SENTRON 5SP3740-2 — 40 A Class E MCB for Meter-Panel Infrastructure The Siemens 5SP3740-2 is a SENTRON main miniature circuit breaker, 1-pole (1P) construction, rated 40 A at 30 °C with a Class E tripping characteristic. Class E is a Siemens-specific characteristic that blends thermal-magnetic and electronic trip elements — it provides a high short-circuit withstand (25 kA) while maintaining selectivity with upstream fuses or breakers in meter-panel configurations. The 1.5-module-width footprint (89.5 mm deep, 151.3 mm high) fits standard DIN-rail enclosures, with busbar fastening for ganged installation. Temperature derating is published: 38 A at 40 °C, 37 A at 45 °C, 36 A at 50 °C, 35 A at 55 °C — factor this into continuous-load planning if the panel ambient runs above 30 °C. ## Sourcing & Lifecycle — Current Production, No LTB Window For BOM-freeze or compliance documentation needs, the SENTRON series carries standard IEC/EN certifications. The 25 kA rating per EN 60898 is the governing standard for residential and commercial final-circuit protection in most European and Asia-Pacific markets. ## Integration — Meter-Panel Lower-Section Installation, Spring-Loaded Outgoing Installation position is stipulated for the lower section of the meter panel, with infeed at the box terminal. The outgoing feeder uses spring-loaded terminals — no screw torque required, which speeds panel assembly and reduces QA checks on terminal tightness. Wire range accepts 2.5–50 mm² solid or stranded copper. Sealable design allows utility or inspector locking. Shock resistance is 30 g, 3 impacts at 11 ms duration — sufficient for transport and seismic events in fixed installations. ## Electrical Ratings — Insulation, Surge, and Selectivity Headroom Insulation voltage rated at 690 V, surge voltage resistance at 6 kV — this exceeds typical 230/400 V distribution requirements, providing margin for transient events and coordination with upstream SPDs.","metaTitle":"Siemens 5SP3740-2 SENTRON MCB, 1P 40A Class E, 25kA","metaDescription":"Siemens 5SP3740-2 SENTRON miniature circuit breaker, 1-pole 40A, Class E characteristic, 25kA breaking capacity per EN 60898. Current 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":"89.5 mm","title":"5SP3740-2","Height":"151.3 mm","Maximum":"70 °C","Minimum":"-40 °C","Sealable":"Yes","Rated Value":"25 kA","description":"Main miniature circuit breaker (SHU), 1-pole, E 40A, 230/400 V (block with L1, L2, L3)","Number Of Poles":"1","Solid / Maximum":"50 mm²","Solid / Minimum":"2.5 mm²","lifecycle_stage":"current","Fastening Method":"Busbar","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":"40 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":"40 A","at 40 °C / rated value":"38 A","at 45 °C / rated value":"37 A","at 50 °C / rated value":"36 A","at 55 °C / rated value":"35 A","Depth / Of The Enclosure":"76.3 mm","Suitability For Operation":"Residential buildings/infrastructure","Number Of Modular Width Units":"1.5","Tripping Characteristic Class":"E","acc. to EN 60898 / rated value":"25 kA","Position / Of Power Supply Cord":"Stipulated by installation in the lower section of the meter panel","Insulation Voltage / Rated Value":"690 V","supply voltage / at AC / rated value":"230 V","Surge Voltage Resistance / Rated Value":"6 kV","Outgoing Feeder Via Spring-Loaded Terminal":"Yes","Fastening Method / Other Installation / Note":"On 40-mm busbar system in compliance with DIN 43870 Part 2","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 (Operating Cycles) / Typical":"20 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/79b66185a1b840e060f6b4752ef2b883.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=169273&mlfb=5SP3740-2"},"ai":{"faq":[{"question":"Where can I buy 5SP3740-2 and what is the lead time?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — no stock count or lead-time number is published here."},{"question":"What is the 5SP3740-2's depth and height?","answer":"Depth is 89.5 mm (enclosure depth 76.3 mm); height is 151.3 mm. It occupies 1.5 modular width units on a DIN rail."},{"question":"What wire sizes does the 5SP3740-2 accept?","answer":"Solid or stranded copper from 2.5 mm² minimum to 50 mm² maximum. The outgoing feeder uses spring-loaded terminals."},{"question":"What compliance documentation is available for 5SP3740-2?","answer":"The SENTRON series carries IEC/EN certifications including EN 60898 for the 25 kA breaking capacity. Standard RoHS and REACH declarations are provided with the product documentation."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SP3740-2","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/5SP3740-2 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}}