{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SP3720-2KK02","brand":"Siemens","brandSlug":"siemens","productSlug":"5SP3720-2KK02","canonicalUrl":"https://aoctrl.com/siemens/5SP3720-2KK02","factsUrl":"https://aoctrl.com/api/mcp/products/5SP3720-2KK02","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON main miniature circuit breaker, 1-pole, E20A L2, 230/400 V, 25 kA breaking capacity per EN 60898, 50 Hz, IP40 with connected conductors, busbar mount.","salesMarkdown":"## What the 25 kA breaking capacity means for your panel The Siemens 5SP3720-2KK02 is a SENTRON main miniature circuit breaker — 1-pole, rated 25 kA breaking capacity per EN 60898 at 230 V AC, 50 Hz. In a residential or infrastructure meter panel where the utility-side fault current can hit 25 kA, this breaker holds the line; anything lower and you risk the breaker failing to clear a bolted fault, which cascades upstream. The E tripping characteristic (E20A L2 per the description) means it's a selective (time-delayed) curve — it rides through short-duration inrush from downstream loads without nuisance tripping, coordinating with branch MCBs so only the faulted circuit opens. ## Mounting and integration in the meter panel Fastens directly onto a 40-mm busbar system per DIN 43870 Part 2 — the standard grid in European meter cabinets. Occupies 1.5 modular width units, so it needs one and a half 18 mm slots on the DIN rail. The outgoing feeder uses a spring-loaded terminal; infeed is via box terminal. Enclosure depth is 76.3 mm; overall depth with the breaker body is 89.5 mm, which fits standard meter-panel enclosures. IP40 with connected conductors — fine for indoor meter boards, not for washdown areas. ## Environmental and mechanical margins Shock tested to 30 g, 11 ms half-sine, 3 impacts per axis; vibration per IEC 60068-2-6 at 2 g, 5–150 Hz, 20 frequency cycles. Mechanical life 20 000 operating cycles typical. ## Locking and seal options Sealable via locking slide accepting a padlock, additional wire seal, cable ties, or Antilux sealing wire. Switch position indicator shows OFF = green, ON = red for quick visual status. Infeed position is stipulated for the lower section of the meter panel per the design.","metaTitle":"Siemens 5SP3720-2KK02 SENTRON MCB, 1P, 25 kA, E-Curve","metaDescription":"Siemens 5SP3720-2KK02 SENTRON main miniature circuit breaker, 1-pole, 25 kA breaking capacity per EN 60898, E tripping characteristic, 230 V AC, 50 Hz. Active production. Quoted to","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":"5SP3720-2KK02","Height":"151.3 mm","Maximum":"70 °C","Minimum":"-40 °C","Sealable":"Yes","Rated Value":"25 kA","description":"Main miniature circuit breaker (SHU), 1-pole, E20A L2, 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":"Busbar","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 40-mm busbar system in compliance with DIN 43870 Part 2","Infeed At Box Terminal":"Yes","Suitability For Operation":"Residential buildings/infrastructure","Design Of The Locking Device":"Locking slide with lock, additional wire seal, cable ties and Antilux","Number Of Modular Width Units":"1.5","Position Of Power Supply Cord":"Stipulated by installation in the lower section of the meter panel","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","Outgoing Feeder Via Spring-Loaded Terminal":"Yes","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/b7eeccab99b60704ffa88ee8f9eee6ca.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=498719&mlfb=5SP3720-2KK02"},"ai":{"faq":[{"question":"What is the breaking capacity of 5SP3720-2KK02?","answer":"Rated 25 kA per EN 60898 at 230 V AC, 50 Hz. That is the maximum fault current it can safely interrupt; for panels with higher prospective fault current, an upstream current-limiting device would be needed."},{"question":"What does the E tripping characteristic mean?","answer":"The E curve is a selective (time-delayed) characteristic — it allows short-duration inrush currents from downstream loads without tripping, coordinating with branch MCBs so only the faulted circuit opens. This is typical for main breakers in meter panels."},{"question":"Where can I buy 5SP3720-2KK02 and what is the price?","answer":"Sourced and quoted to order against an RFQ through independent distribution. Current pricing and availability are confirmed at quote time — submit an RFQ for a firm quote and lead time."},{"question":"What conductor sizes does 5SP3720-2KK02 accept?","answer":"Solid or stranded conductors from 2.5 mm² up to 50 mm² at both line and load terminals. The outgoing feeder uses a spring-loaded terminal; infeed is via box terminal."},{"question":"Will 5SP3720-2KK02 fit in a standard meter panel?","answer":"Yes. It occupies 1.5 modular width units on a 40-mm busbar system per DIN 43870 Part 2. Overall depth is 89.5 mm; enclosure depth is 76.3 mm — fits standard European meter cabinets. Height is 151.3 mm."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SP3720-2KK02","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/5SP3720-2KK02 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}}