{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SL4125-8","brand":"Siemens","brandSlug":"siemens","productSlug":"5SL4125-8","canonicalUrl":"https://aoctrl.com/siemens/5SL4125-8","factsUrl":"https://aoctrl.com/api/mcp/products/5SL4125-8","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON, Miniature circuit breaker, 5SL4125-8, 1-pole, 25 A rated at AC, D tripping characteristic, 10 kA breaking capacity per EN 60898 and IEC 60947-2, 1 modular width (18 mm).","salesMarkdown":"The Siemens 5SL4125-8 is a 1-pole SENTRON miniature circuit breaker (MCB) with a D tripping characteristic, rated 25 A at AC and a 10 kA breaking capacity under both EN 60898 and IEC 60947-2. At 40 °C ambient the continuous rating derates to 23.1 A; at 55 °C it drops to 19.91 A, so if the panel runs hot, size up or account for the thermal curve. Single-pole switching at 250 V AC single-phase, or 440 V AC multi-phase. The DC rating tops at 72 V — fine for control-circuit protection, not for a DC bus. Occupies one modular width (18 mm) on a DIN rail. Mounting position any, which helps in tight enclosures where the rail is vertical. IP20 with connected conductors; that's expected for a distribution board — no washdown rating, keep it inside the cabinet. Sealable and touch-protected. The 10 kA breaking capacity at 400 V AC (EN 60898) and the same 10 kA under IEC 60947-2 tell you this MCB can safely interrupt a fault current up to that level without welding contacts or cascading failure upstream. For a panel fed by a transformer with a prospective short-circuit current under 10 kA, this breaker coordinates cleanly. Energy limitation class 3 means it lets through less let-through energy (I²t) than class 1 or 2 — that protects downstream wiring and connected loads during a fault. The 95% humidity tolerance at 55 °C is the upper bound for condensation-prone environments — still keep the enclosure sealed, but the breaker won't be the weak link.","metaTitle":"Siemens 5SL4125-8 SENTRON MCB, 1P, 25 A, D Curve, 10 kA","metaDescription":"Siemens 5SL4125-8 SENTRON miniature circuit breaker, 1-pole, 25 A rated, D tripping characteristic, 10 kA breaking capacity per EN 60898 & IEC 60947-2. Active production. Quoted to","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["1-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Width":"18 mm","title":"5SL4125-8","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Miniature circuit breaker 230/400 V 10kA, 1-pole, D, 25A","Halogen-Free":"Yes","Silicon-Free":"Yes","Number Of Poles":"1","Type Of Voltage":"AC","lifecycle_stage":"current","Mounting Position":"any","Installation Depth":"70 mm","Product Brand Name":"SENTRON","Degree Of Pollution":"2","Product Designation":"Miniature circuit breaker","acc. to IEC 81346-2":"F","at AC / rated value":"25 A","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","Number Of Poles / Note":"1P","acc. to DIN EN 61346-2":"F","Energy Limitation Class":"3","at 30 °C / rated value":"25 A","at 40 °C / rated value":"23.1 A","at 45 °C / rated value":"22 A","at 55 °C / rated value":"19.91 A","Suitability For Operation":"Residential buildings/infrastructure","Number Of Modular Width Units":"1","Tripping Characteristic Class":"D","at DC / rated value / maximum":"72 V","acc. to EN 60898 / rated value":"10 kA","acc. to IEC 60947-2 / rated value":"10 kA","Product Feature / Touch Protection":"Yes","supply voltage / at AC / rated value":"400 V","Influence Of The Surrounding Temperature":"+55 °C, max. 95% humidity","with multi-phase operation / at AC / maximum":"440 V","Product Function / Neutral Conductor Switching":"No","with multi-phase operation / at AC / rated value":"440 V","with single-phase operation / at AC / rated value":"250 V","Mechanical Service Life (Operating Cycles) / Typical":"10 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/969d2a03ff948cc8b48940093bb94601.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=463626&mlfb=5SL4125-8"},"ai":{"faq":[{"question":"Where can I buy the 5SL4125-8 and what is the lead time?","answer":"The 5SL4125-8 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 the specific quantity and delivery window."},{"question":"Will the 5SL4125-8 drop into a panel specified for 5SL6132-6MB without rewiring?","answer":"Both are 1-pole SENTRON MCBs on the same 18 mm modular DIN-rail footprint, so the 5SL4125-8 fits the same physical slot. The difference is electrical: the 5SL4125-8 is a 25 A D-curve breaker, while the 5SL6132-6MB is a different rating and characteristic — verify the circuit's load and fault-current requirements before swapping."},{"question":"What compliance documentation does Siemens provide for the 5SL4125-8?","answer":"The 5SL4125-8 is designed to EN 60898 and IEC 60947-2, with overvoltage category III and pollution degree 2. It carries the CE mark for the European market. For specific RoHS, REACH, or UL documentation, the manufacturer's declaration is available on request — the part is halogen-free and silicon-free by spec."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SL4125-8","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/5SL4125-8 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}}