{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SP3720-2KK03","brand":"Siemens","brandSlug":"siemens","productSlug":"5SP3720-2KK03","canonicalUrl":"https://aoctrl.com/siemens/5SP3720-2KK03","factsUrl":"https://aoctrl.com/api/mcp/products/5SP3720-2KK03","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SP3720-2KK03, main miniature circuit breaker (SHU), 1-pole, E20A L3, 230/400 V, 25 kA breaking capacity, 1.5 MW units.","salesMarkdown":"The Siemens 5SP3720-2KK03 is a SENTRON main miniature circuit breaker (SHU) — a 1-pole, E-characteristic device rated for 230 V AC supply voltage with a 25 kA breaking capacity per EN 60898. This is a main breaker intended for the incoming feed in residential or infrastructure meter panels, not a branch-circuit MCB. The insulation voltage (Ui) is rated at 690 V, and surge voltage resistance is 6 kV, overvoltage category IV — meaning it's built for the utility-side of the meter, not downstream branch protection. Mechanical service life is 20,000 operating cycles typical. That's the expected life of the mechanism under normal switching — not the number of fault interruptions, which is much lower. For a main breaker that cycles only on panel shutdown, this is ample. The enclosure depth is 76.3 mm, overall depth 89.5 mm, height 151.3 mm — fits standard meter-panel cutouts. Mounts on a 40-mm busbar system per DIN 43870 Part 2, or via busbar fastening. Infeed is at the box terminal; outgoing feeder uses spring-loaded terminals. Conductor range: 2.5 to 50 mm² solid or stranded. IP40 with connected conductors, pollution degree 3, vibration resistance 2 g per IEC 60068-2-6, shock resistance 30 g at 11 ms. Sealable with locking slide, wire seal, cable ties, or Antilux — important for utility-locked meter cabinets. ## Integration and deployment context In a meter panel, the supply cord position is stipulated for the lower section — meaning the incoming feed enters at the bottom, outgoing at the top via spring-loaded terminals. The switch position indicator shows OFF = green, ON = red, a standard visual cue for panel walk-downs.","metaTitle":"Siemens 5SP3720-2KK03 SENTRON MCB, 1P, E-Curve, 25 kA","metaDescription":"Siemens SENTRON 5SP3720-2KK03 main miniature circuit breaker, 1-pole, E-characteristic, 25 kA breaking capacity at 230 V AC. Current production. Available to order against RFQ.","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":"5SP3720-2KK03","Height":"151.3 mm","Maximum":"70 °C","Minimum":"-40 °C","Sealable":"Yes","Rated Value":"25 kA","description":"Main miniature circuit breaker (SHU), 1-pole, E20A L3, 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/61eeb48b92d3f637999049d34b619846.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=154763&mlfb=5SP3720-2KK03"},"ai":{"faq":[{"question":"Where can I buy 5SP3720-2KK03 and how do I 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 quote."},{"question":"What is the breaking capacity of 5SP3720-2KK03?","answer":"The rated breaking capacity is 25 kA at 230 V AC per EN 60898, with an insulation voltage of 690 V and surge voltage resistance of 6 kV."},{"question":"What compliance documentation does Siemens provide for 5SP3720-2KK03?","answer":"The part carries ratings per EN 60898, IEC 60068-2-6, and DIN 43870 Part 2. Standard Siemens SENTRON documentation includes CE declaration of conformity and RoHS/REACH compliance statements available through the manufacturer's documentation portal."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SP3720-2KK03","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/5SP3720-2KK03 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}}