{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SP3740-2KK03","brand":"Siemens","brandSlug":"siemens","productSlug":"5SP3740-2KK03","canonicalUrl":"https://aoctrl.com/siemens/5SP3740-2KK03","factsUrl":"https://aoctrl.com/api/mcp/products/5SP3740-2KK03","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SP3 series, main miniature circuit breaker (SHU), 1-pole, 40 A, E tripping characteristic, 25 kA, 230 V AC, 50 Hz.","salesMarkdown":"The Siemens 5SP3740-2KK03 is a SENTRON main miniature circuit breaker (SHU) — a 1-pole, 40 A device with an E tripping characteristic, rated 230 V AC at 50 Hz. The E curve (a less common characteristic than B, C, or D) is designed for selective coordination with downstream MCBs — it holds through higher inrush without tripping, so a fault on a branch clears without taking the main breaker out. That selectivity matters in meter-panel installations where you want the feeder breaker to stay closed for a downstream fault. Mounts on a 40-mm busbar system per DIN 43870 Part 2 — this is the standard busbar pitch for European meter-panel layouts, not a general DIN-rail mount. The 1.5 width units (roughly 27 mm wide) and 89.5 mm depth fit the compact form factor of a meter cabinet. Infeed is at the box terminal; outgoing feeder uses a spring-loaded terminal. The switch position indicator shows OFF = green, ON = red, which is a quick visual check during commissioning or troubleshooting. Rated IP40 with connected conductors, so it's suitable for enclosed panels but not washdown areas. Shock resistance is 30 g for at least 3 impacts at 11 ms duration; vibration resistance is 2 g per IEC 60068-2-6 across 5 to 150 Hz. Mechanical service life is 20 000 switching cycles typical — that's more than adequate for a main breaker that sees infrequent operation. Overvoltage category IV means it's rated for the utility-side interface, not just downstream distribution.","metaTitle":"Siemens 5SP3740-2KK03 SENTRON MCB, 1P 40A E-Curve 25kA","metaDescription":"Siemens 5SP3740-2KK03 SENTRON miniature circuit breaker, 1-pole, 40 A, E tripping characteristic, 25 kA breaking capacity per EN 60898, 230 V AC, 50 Hz. Current lifecycle stage. So","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["1-Pole MCB (DIN Rail)"],"specifications":{"Depth":"89.5 mm","title":"5SP3740-2KK03","Height":"151.3 mm","Maximum":"70 °C","Minimum":"-40 °C","Sealable":"Yes","Rated Value":"25 kA","description":"Main miniature circuit breaker (SHU), 1-pole, E40A L3, 230/400 V","Mounting type":"Busbar","Number of poles":"1","lifecycle_stage":"current","Shock resistance":"30 g, at least 3 impacts, impact duration 11 ms","Product brand name":"SENTRON","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/c3156528dd4d47b147168736aee5572d.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=455094&mlfb=5SP3740-2KK03"},"ai":{"faq":[{"question":"What is the difference between 5SP3740-2KK03 and the 5SL6563-7BB?","answer":"The 5SP3740-2KK03 is a 1-pole 40 A E-curve main MCB with 25 kA breaking capacity, designed for busbar mounting in meter panels. The 5SL6563-7BB is a 2-pole 63 A C-curve miniature circuit breaker with 6 kA breaking capacity, mounted on DIN rail. They are not drop-in replacements — different pole count, current rating, tripping characteristic, breaking capacity, and mounting method. The 5SP3 is for the main incoming protection; the 5SL6 is for branch circuits."},{"question":"Where can I buy 5SP3740-2KK03 and how is it quoted?","answer":"We source and quote this part to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — no stock figures or price are listed here because the market moves daily."},{"question":"What are the key dimensions of 5SP3740-2KK03?","answer":"Depth is 89.5 mm, height is 151.3 mm, and it occupies 1.5 width units (approximately 27 mm) on a 40-mm busbar system."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SP3740-2KK03","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/5SP3740-2KK03 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}}