{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SL1125-6MB","brand":"Siemens","brandSlug":"siemens","productSlug":"5SL1125-6MB","canonicalUrl":"https://aoctrl.com/siemens/5SL1125-6MB","factsUrl":"https://aoctrl.com/api/mcp/products/5SL1125-6MB","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SL1125-6MB miniature circuit breaker, 1-pole, B-characteristic, 25 A rated current, 3 kA breaking capacity per IEC 60947-2, 230/400 V AC, 1 MW (18 mm), IP20.","salesMarkdown":"Not for motor starting; that needs a C or D curve. Mounting position is unrestricted — vertical, horizontal, upside-down — which helps when you're packing a crowded panel. The IP20 rating applies with conductors connected; that's normal for a distribution board interior. The single-phase AC voltage rating is 230 V (253 V max), and multi-phase (line-to-line) goes to 440 V. For DC circuits, the maximum voltage is 72 V — that's the limit for the single-pole break; beyond that you need series poles or a DC-rated breaker. Breaking capacity is 3 kA per IEC 60947-2. That's the industrial standard for the rating, not the domestic EN 60898 standard (which would be lower). In a residential or light-commercial distribution board with a typical upstream transformer impedance, 3 kA is adequate for most branch circuits. If your available fault current is higher — say a large transformer close to the panel — you'd step up to the 6 kA or 10 kA versions in the same SENTRON family. Mechanical endurance is 4,000 switching cycles. For daily on/off duty, add a contactor ahead of it. ## Physical and environmental The 5SL1125-6MB measures 18 mm wide, 90 mm tall, and 76 mm deep (70 mm installation depth behind the panel face). Pollution degree 2 (normal, non-conductive) and overvoltage category III (distribution level). Sealable — you can lock the toggle position with a seal wire for anti-tamper.","metaTitle":"Siemens 5SL1125-6MB SENTRON MCB, 1P B 25A 3kA","metaDescription":"Siemens 5SL1125-6MB SENTRON miniature circuit breaker, 1-pole, B-curve, 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":["1-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Width":"18 mm","title":"5SL1125-6MB","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Circuit breaker 230/400V 3kA, 1pole, B, 25A","Halogen-Free":"Yes","Silicon-Free":"Yes","Design Of Pole":"1P","Number Of Poles":"1","lifecycle_stage":"current","Mounting Position":"any","Installation Depth":"70 mm","Product Brand Name":"SENTRON","Degree Of Pollution":"2","Product Designation":"Miniature circuit breaker","at AC / rated value":"25 A","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","at 30 °C / rated value":"25 A","Suitability For Operation":"Residential buildings/infrastructure","Number Of Modular Width Units":"1","Tripping Characteristic Class":"B","at DC / rated value / maximum":"72 V","acc. to IEC 60947-2 / rated value":"3 kA","Product Feature / Touch Protection":"No","supply voltage / at AC / rated value":"230 V","Type Of Voltage / Of The Operating Voltage":"AC","with multi-phase operation / at AC / maximum":"440 V","Product Component / Neutral Conductor Switching":"No","with multi-phase operation / at AC / rated value":"440 V","with single-phase operation / at AC / rated value":"253 V","Mechanical Service Life (Switching Cycles) / Typical":"4 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/539aaa4763444d974e0c8f8a47206f07.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=1046705&mlfb=5SL1125-6MB"},"ai":{"faq":[{"question":"Will the 5SL1125-6MB drop into a panel specified around the 5SL6006-7?","answer":"Yes, the 5SL1125-6MB shares the same 18 mm width, 76 mm depth, and 90 mm height as the 5SL6006-7, so it fits the same DIN-rail footprint and panel cutout. The difference is the tripping curve (B vs C) and breaking capacity (3 kA vs 6 kA). No rewiring needed for the physical swap, but verify that the B-curve and 3 kA rating match your circuit's coordination study."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SL1125-6MB","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/5SL1125-6MB 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}}