{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SL6125-6","brand":"Siemens","brandSlug":"siemens","productSlug":"5SL6125-6","canonicalUrl":"https://aoctrl.com/siemens/5SL6125-6","factsUrl":"https://aoctrl.com/api/mcp/products/5SL6125-6","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON miniature circuit breaker, 5SL6125-6, 1-pole, B characteristic, 25 A rated current, 6 kA breaking capacity per EN 60898, 230/400 V AC.","salesMarkdown":"## What this MCB does on the rail The Siemens SENTRON 5SL6125-6 is a 1-pole miniature circuit breaker with a B tripping characteristic, rated 25 A at 30 °C and 400 V AC per EN 60898. Its 6 kA breaking capacity covers residential and light commercial distribution boards where the prospective short-circuit current stays under that threshold. The B curve means it trips between 3 and 5 times rated current — typical for resistive and general-purpose loads where inrush is modest. At 40 °C ambient the continuous rating drops to 23.48 A; at 55 °C it's 21 A, so derate if the panel runs hot. Single-pole format occupies one modular width (18 mm) on a DIN rail, and the IP20 rating with connected conductors is standard for enclosed distribution boards. ## Physical fit and environment Width 18 mm (one modular unit), depth 76 mm, height 90 mm — fits any standard 35 mm DIN-rail enclosure. Installation depth 70 mm leaves clearance for rear busbars. Mounting position any orientation; pollution degree 2 (non-conductive, occasional condensation). Temperature range -40 °C to 75 °C covers unheated utility rooms and outdoor-adjacent cabinets. Halogen-free and silicon-free construction matters for clean-room or high-reliability environments where outgassing can't be tolerated. Sealable terminals allow lockout/tagout compliance. Supplementary devices (auxiliary contacts, shunt trips, alarm switches) can be snapped on the right side. ## Electrical ratings and coordination Rated 25 A at 230/400 V AC, single-pole switching. Breaking capacity 6 kA per both EN 60898 and IEC 60947-2 — that's the same standard for residential and industrial coordination. Overvoltage category III (distribution level). Energy limitation class 3 means it limits let-through energy for downstream equipment protection. Mechanical endurance 10 000 operating cycles typical. Power loss 2.8 W per pole at rated current in hot state — factor into thermal calculations for multi-pole assemblies in compact enclosures.","metaTitle":"Siemens SENTRON 5SL6125-6 MCB, 1P, B, 25 A, 6 kA","metaDescription":"Siemens SENTRON 5SL6125-6 miniature circuit breaker, 1-pole, B-curve, 25 A, 6 kA breaking capacity per EN 60898. Active production, sourced to order. Request quote.","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":"5SL6125-6","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Miniature circuit breaker 230/400 V 6kA, 1-pole, B, 25A","Halogen-Free":"Yes","Silicon-Free":"Yes","Design Of Pole":"1P","Number Of Poles":"1","lifecycle_stage":"current","Mounting Position":"any","at AC rated value":"25 A","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","at 30 °C rated value":"25 A","at 40 °C rated value":"23.48 A","at 45 °C rated value":"22.5 A","at 55 °C rated value":"21 A","Energy Limitation Class":"3","Suitability For Operation":"Residential buildings/infrastructure","at DC rated value maximum":"72 V","Number Of Modular Width Units":"1","Tripping Characteristic Class":"B","supply voltage at AC rated value":"400 V","according to EN 60898 rated value":"6 kA","according to IEC 60947-2 rated value":"6 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":"250 V","Mechanical Service Life (Operating Cycles) Typical":"10 000","Product Extension Installable Supplementary Devices":"Yes","power loss [W] for rated value of the current at AC in hot operating state per pole":"2.8 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$2.37","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/e5562d13cec3f78d16b1ae750ea4f1d0.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=139753&mlfb=5SL6125-6"},"ai":{"faq":[{"question":"What is the breaking capacity of 5SL6125-6?","answer":"6 kA per EN 60898 and also 6 kA per IEC 60947-2, at 400 V AC."},{"question":"What is the width of 5SL6125-6?","answer":"18 mm, which is one modular unit on a DIN rail."},{"question":"What is the depth of 5SL6125-6?","answer":"76 mm overall; installation depth is 70 mm."},{"question":"Does 5SL6125-6 accept auxiliary contacts or shunt trips?","answer":"Yes, supplementary devices can be installed on the right side."},{"question":"Where can I buy 5SL6125-6?","answer":"Sourced to order against an RFQ through independent distribution. Availability and current pricing confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SL6125-6","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/5SL6125-6 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}}