{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SP3740-2KK02","brand":"Siemens","brandSlug":"siemens","productSlug":"5SP3740-2KK02","canonicalUrl":"https://aoctrl.com/siemens/5SP3740-2KK02","factsUrl":"https://aoctrl.com/api/mcp/products/5SP3740-2KK02","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SP3, miniature circuit breaker (MCB), 1-pole, 40 A, E tripping characteristic, 25 kA breaking capacity per EN 60898, busbar mount, 1.5 width units, 5SP3740-2KK02.","salesMarkdown":"The Siemens 5SP3740-2KK02 is a 1-pole miniature circuit breaker from the SENTRON 5SP3 series, rated 40 A with an E tripping characteristic and a 25 kA breaking capacity per EN 60898. It mounts on a 40-mm busbar system per DIN 43870 Part 2 and occupies 1.5 width units — a form factor designed for residential and infrastructure meter panels where the supply cord enters at the lower section of the enclosure. The E-curve trips magnetically between 10× and 20× In (400–800 A for this 40 A unit), which is higher than a B- or C-curve. That selectivity matters when you have inrush from multiple downstream loads or transformer-fed circuits — you want the branch MCB to clear a fault before the upstream device, not nuisance-trip on a motor start. The outgoing feeder uses a spring-loaded terminal; infeed is at the box terminal. That 50 mm² top end means it can handle the incoming service cable for a residential main breaker role, not just branch circuits. Protection class is IP40 with connected conductors — fine for enclosed meter panels, not for wet or outdoor locations without a weatherproof enclosure. Mechanical robustness: shock resistance is 30 g for at least 3 impacts at 11 ms duration; vibration resistance per IEC 60068-2-6 is 2 g over 20 frequency cycles from 5 to 150 Hz. The switch position indicator shows green for OFF, red for ON. ## Sealing and locking provisions The 5SP3740-2KK02 is sealable and includes a locking slide compatible with a lock, additional wire seal, cable ties, and Antilux. This is a practical detail for utility metering or tamper-evident installations where the breaker position must be locked after commissioning.","metaTitle":"Siemens 5SP3740-2KK02 SENTRON MCB, 1P 40A E-Curve, 25kA","metaDescription":"Siemens 5SP3740-2KK02 SENTRON miniature circuit breaker, 1-pole, 40 A, E tripping characteristic, 25 kA breaking capacity per EN 60898. Busbar mount, 1.5 width units. Sourced to or","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["1-Pole MCB (DIN Rail)"],"specifications":{"Depth":"89.5 mm","Solid":"2.5 ... 50 mm²","title":"5SP3740-2KK02","Height":"151.3 mm","Maximum":"440 V","Minimum":"110 V","Sealable":"Yes","Stranded":"2.5 ... 50 mm²","Rated Value":"25 kA","description":"Main miniature circuit breaker (SHU), 1-pole, E40A L2, 230/400 V","Mounting type":"Busbar","During Storage":"-40 ... +70 °C","Number of poles":"1","lifecycle_stage":"current","Shock resistance":"30 g, at least 3 impacts, impact duration 11 ms","Product brand name":"SENTRON","Ambient temperature":"-25 ... +55 °C","Product designation":"Miniature circuit breaker","Protection class IP":"IP40, with connected conductors","Overvoltage category":"IV","Design of the product":"Main miniature circuit breaker","Number of width units":"1.5","Infeed at box terminal":"Yes","Number of poles / Note":"1P","acc. to DIN EN 61346-2":"F","acc. to DIN EN 81346-2":"F","Depth / of the enclosure":"76.3 mm","circuit-breaker / Design":"5SP3","Suitability for operation":"Residential buildings/infrastructure","Design of the locking device":"Locking slide with lock, additional wire seal, cable ties and Antilux","Current / at AC / rated value":"40 A","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","Supply voltage frequency / rated value":"50 Hz","Surge voltage resistance / rated value":"6 kV","Mounting type / other installation / Note":"On 40-mm busbar system in compliance with DIN 43870 Part 2","Outgoing Feeder Via Spring-Loaded Terminal":"Yes","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/e75a726f46c8c74252c2110689bce044.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=472958&mlfb=5SP3740-2KK02"},"ai":{"faq":[{"question":"What is the depth of the 5SP3740-2KK02?","answer":"The overall depth is 89.5 mm; the depth of the enclosure portion is 76.3 mm."},{"question":"What conductor sizes does the 5SP3740-2KK02 accept?","answer":"It accepts solid or stranded conductors from 2.5 mm² up to 50 mm²."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SP3740-2KK02","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/5SP3740-2KK02 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}}