{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SL6125-6BB","brand":"Siemens","brandSlug":"siemens","productSlug":"5SL6125-6BB","canonicalUrl":"https://aoctrl.com/siemens/5SL6125-6BB","factsUrl":"https://aoctrl.com/api/mcp/products/5SL6125-6BB","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SL6125-6BB, miniature circuit breaker, 1-pole, B-curve, 25 A, 6 kA, 400 V AC, 1 MWU.","salesMarkdown":"The Siemens SENTRON 5SL6125-6BB is a 1-pole miniature circuit breaker (MCB) with a B tripping characteristic, rated 25 A at 400 V AC. It breaks fault currents up to 6 kA per both EN 60898 and IEC 60947-2 — that's the standard interrupting rating for residential and light commercial distribution boards, meaning it clears a short-circuit without upstream device intervention as long as the prospective fault current stays under that limit. At 25 A it covers lighting circuits, socket outlets, and small appliance feeds. The 6 kA breaking capacity matches the typical domestic service entrance; if your panel's prospective short-circuit current exceeds that, you'd step up to a higher-rated SENTRON series (e.g., 5SY with 10 kA or 25 kA). Single-pole (1P) form factor occupies 1 modular width unit (18 mm) on DIN rail. Mounting position is unrestricted, and the 70 mm installation depth plus 76 mm overall depth fits standard 80 mm deep enclosures with room for wiring. The -40 °C to +75 °C storage range covers most unheated warehouses; the operating derating above +55 °C at 95% humidity is noted in the spec, so if the breaker lives in a hot attic or boiler room, you'll want to check the thermal curve.","metaTitle":"Siemens 5SL6125-6BB SENTRON MCB, 1P B 25A 6kA","metaDescription":"Siemens SENTRON 5SL6125-6BB miniature circuit breaker, 1-pole, B-curve, 25 A, 6 kA breaking capacity per EN 60898. Active production, sourced 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":"5SL6125-6BB","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","Rated Value":"50 Hz","description":"Miniature circuit breaker 230/400 V 6kA, 1-pole B, 25A Version Italy","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","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","Design Of The Product":"5SL miniature circuit breakers","Number Of Poles / Note":"1P","acc. to DIN EN 61346-2":"F","Energy Limitation Class":"3","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 EN 60898 / rated value":"6 kA","acc. to IEC 60947-2 / rated value":"6 kA","Product Feature / Touch Protection":"Yes","supply voltage / at AC / rated value":"400 V","Influence Of The Surrounding Temperature":"Periodically +55°C, max. 95% humidity","operational current / at AC / rated value":"25 A","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 (Switching Cycles) / Typical":"10 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"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=285482&mlfb=5SL6125-6BB"},"ai":{"faq":[{"question":"What is the breaking capacity of the 5SL6125-6BB?","answer":"6 kA per EN 60898 and also 6 kA per IEC 60947-2. This is the standard interrupting rating for residential and light commercial distribution."},{"question":"Will the 5SL6125-6BB drop into a panel specified for the 5SL3120-6MB?","answer":"Both are 1-pole SENTRON MCBs on the same DIN-rail footprint (1 MWU, 18 mm wide). The 5SL6125-6BB is a B-curve 25 A; the 5SL3120-6MB is a different rating and curve. They share mechanical dimensions and mounting, so a swap is possible if the electrical ratings match the circuit requirements."},{"question":"What compliance documentation does Siemens provide for the 5SL6125-6BB?","answer":"The breaker carries CE marking for the European market. It is designed to EN 60898 and IEC 60947-2. RoHS and REACH declarations are standard from Siemens for the SENTRON line; request them at order time."},{"question":"Where can I buy the 5SL6125-6BB?","answer":"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 offer."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SL6125-6BB","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/5SL6125-6BB 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}}