{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SL4208-7","brand":"Siemens","brandSlug":"siemens","productSlug":"5SL4208-7","canonicalUrl":"https://aoctrl.com/siemens/5SL4208-7","factsUrl":"https://aoctrl.com/api/mcp/products/5SL4208-7","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON, miniature circuit breaker 5SL4208-7, 2-pole, C-curve, 8 A, 400 V AC, 10 kA breaking capacity per EN 60898/IEC 60947-2.","salesMarkdown":"## What it is and what it does The Siemens 5SL4208-7 is a 2-pole miniature circuit breaker from the SENTRON family, rated 8 A at 400 V AC with a C tripping characteristic. It interrupts fault currents up to 10 kA per EN 60898 and IEC 60947-2 — that means it clears a short-circuit fast enough to protect the downstream wiring and avoid cascading upstream breakers. The C curve (5–10× In) is the standard choice for inductive loads like contactors, small motors, and lighting ballasts in commercial panels; it handles the inrush without nuisance trips while still clearing a hard fault. ## Thermal derating and ambient reality The 8 A rating holds at 30 °C. At 40 °C it derates to 7.39 A, at 45 °C to 7.04 A, and at 55 °C to 6.37 A (–). If this breaker sits in a crowded panel near transformers or drives, that derating curve is the one that governs the load you can actually protect — not the nameplate 8 A. The operating range spans –40 °C to +75 °C (–), so it takes the radiant heat and cold start conditions you see in outdoor or mill-adjacent enclosures. ## Panel fit and mounting Two modular width units (36 mm wide) snap onto standard DIN rail. Depth is 76 mm, installation depth 70 mm. Mounting position is any — no derating for sideways or inverted install. Touch protection is built in. The housing is halogen-free and silicon-free (–), which matters if the panel sits in a clean room or near sensitive electronics where outgassing can cause contact corrosion.","metaTitle":"Siemens 5SL4208-7 SENTRON MCB, 2-pole C 8A, 10 kA","metaDescription":"Siemens 5SL4208-7 SENTRON miniature circuit breaker, 2-pole, C-curve, 8 A, 10 kA breaking capacity per EN 60898. Rated 400 V AC. Active production. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["2-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Width":"36 mm","title":"5SL4208-7","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Miniature circuit breaker 400 V 10kA, 2-pole, C, 8A","Halogen-Free":"Yes","Silicon-Free":"Yes","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","acc. to IEC 81346-2":"F","at AC / rated value":"8 A","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","acc. to DIN EN 61346-2":"F","Energy Limitation Class":"3","at 30 °C / rated value":"8 A","at 40 °C / rated value":"7.39 A","at 45 °C / rated value":"7.04 A","at 55 °C / rated value":"6.37 A","Suitability For Operation":"Residential buildings/infrastructure","Number Of Modular Width Units":"2","Tripping Characteristic Class":"C","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","Mechanical Service Life (Switching Cycles) / Typical":"10 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$16.51","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/7404ae85aaaa1f58b9c29459ca8938a8.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=219186&mlfb=5SL4208-7"},"ai":{"faq":[{"question":"Who supplies 5SL4208-7 and how is it quoted for volume purchases?","answer":"This part is sourced through independent distribution channels. Submit an RFQ for current pricing and availability on volume purchases."},{"question":"What is 5SL4208-7's listed depth (76 mm) on this component line?","answer":"The depth is 76 mm, with an installation depth of 70 mm. Width is 36 mm (2 modular units), height 90 mm."},{"question":"Will 5SL4208-7 drop into a panel that was specified around 5SL6550-7BB without rewiring?","answer":"Both are 2-pole SENTRON MCBs on the same DIN-rail footprint, so the mechanical swap is straightforward. Verify the C-curve and 8 A rating match the circuit design; the 5SL6550-7BB is a higher-current variant (50 A) and is not a direct functional replacement for this 8 A breaker."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SL4208-7","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/5SL4208-7 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}}