{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SL1225-6MB","brand":"Siemens","brandSlug":"siemens","productSlug":"5SL1225-6MB","canonicalUrl":"https://aoctrl.com/siemens/5SL1225-6MB","factsUrl":"https://aoctrl.com/api/mcp/products/5SL1225-6MB","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SL1225-6MB, miniature circuit breaker, 2-pole, B characteristic, 25 A rated current, 3 kA breaking capacity per IEC 60947-2, 230/400 V AC.","salesMarkdown":"The Siemens 5SL1225-6MB is a SENTRON miniature circuit breaker rated 25 A, B characteristic, 2-pole, with a 3 kA breaking capacity per IEC 60947-2. ## Fit and footprint Mounting position is any, so you can lay it sideways in a shallow enclosure without derating. IP20 with connected conductors, which is normal for a distribution board interior; no washdown rating here. The sealable design lets a panel builder lock the toggle position — useful for a lighting circuit that shouldn't be switched off by accident. ## What the ratings mean The 3 kA breaking capacity (IEC 60947-2) is the maximum prospective fault current this MCB can safely interrupt. At 230/400 V AC, single-phase or multi-phase, this part covers the typical residential and infrastructure branch circuit. Mechanical service life is 4 000 operating cycles typical. That's fine for a distribution board that sees a few operations a year; for a frequently switched load you'd want a contactor ahead of the MCB.","metaTitle":"Siemens 5SL1225-6MB SENTRON MCB, 2P, B Curve, 25A, 3kA","metaDescription":"Siemens 5SL1225-6MB SENTRON miniature circuit breaker, 2-pole, B characteristic, 25 A, 3 kA breaking capacity per IEC 60947-2. Active production. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["2-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Width":"36 mm","title":"5SL1225-6MB","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Circuit breaker 230/400V 3kA, 2pole, B, 25A","Halogen-Free":"Yes","Silicon-Free":"Yes","Design Of Pole":"2P","Number Of Poles":"2","lifecycle_stage":"current","Mounting Position":"any","Installation Depth":"70 mm","Product Brand Name":"SENTRON","Degree Of Pollution":"2","Product Designation":"Miniature circuit breaker","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","Suitability For Operation":"Residential buildings/infrastructure","at DC rated value maximum":"72 V","Number Of Modular Width Units":"2","Tripping Characteristic Class":"B","supply voltage at AC rated value":"230 V","according to IEC 60947-2 rated value":"3 kA","Type Of Voltage Of The Operating Voltage":"AC","with multi-phase operation at AC maximum":"440 V","Value Range Of The Supply Voltage Frequency":"50/60 Hz","with multi-phase operation at AC rated value":"440 V","with single-phase operation at AC rated value":"253 V","Mechanical Service Life (Operating Cycles) Typical":"4 000","power loss [W] for rated value of the current at AC in hot operating state per pole":"2.4 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/7578515607fbd839b18de5c8261eaf62.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=1046729&mlfb=5SL1225-6MB"},"ai":{"faq":[{"question":"Where can I buy 5SL1225-6MB and 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 and we'll respond with a firm quote."},{"question":"Will 5SL1225-6MB drop into a panel specified around 5SL4363-7?","answer":"Not without changes. The 5SL1225-6MB is 2-pole, 36 mm wide; the 5SL4363-7 is 3-pole, 54 mm wide. Both mount on DIN rail at the same 76 mm depth, but the pole count and width are different — you'd need to rework the busbar and possibly the enclosure fill factor."},{"question":"What is the depth of 5SL1225-6MB?","answer":"76 mm overall depth, with a 70 mm installation depth behind the panel surface."},{"question":"What compliance documentation does Siemens provide for 5SL1225-6MB?","answer":"The part carries halogen-free and silicon-free construction, and is rated for overvoltage category III and pollution degree 2 per IEC 60947-2. Standard Siemens SENTRON documentation includes CE declaration of conformity and the product datasheet. RoHS and REACH compliance is typical for this series; the specific declarations are available on request."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SL1225-6MB","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/5SL1225-6MB 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}}