{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SL4408-6","brand":"Siemens","brandSlug":"siemens","productSlug":"5SL4408-6","canonicalUrl":"https://aoctrl.com/siemens/5SL4408-6","factsUrl":"https://aoctrl.com/api/mcp/products/5SL4408-6","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SL4408-6, 4-pole miniature circuit breaker, B-curve, 8 A rated, 10 kA breaking capacity, 400 V AC.","salesMarkdown":"The Siemens 5SL4408-6 is a SENTRON-series miniature circuit breaker (MCB) — a 4-pole, 4-module-width unit with a B tripping curve, rated 8 A at 400 V AC. The B-curve trips between 3 and 5 times rated current — so for this 8 A breaker, magnetic trip happens between 24 and 40 A. That makes it a good fit for resistive loads and general-purpose wiring where you don't expect high inrush; it's not the right choice for motor starting or transformer primaries where a C or D curve would be needed to avoid nuisance trips on inrush. Temperature derating is built into the spec: at 30 °C ambient it carries the full 8 A, but at 55 °C it's derated to 6.37 A. The 4-pole configuration (4P) switches all four poles simultaneously — line and neutral. That's typical for three-phase plus neutral distribution in European-style panels where you want a single device isolating the whole circuit. The neutral conductor is not switched separately, which is noted in the spec.","metaTitle":"Siemens 5SL4408-6 SENTRON MCB, 4P B-Curve 8A, 10kA","metaDescription":"Siemens 5SL4408-6 SENTRON miniature circuit breaker, 4-pole, B-curve, 8 A rated, 10 kA breaking capacity per EN 60898. Current production. Available to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["4-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Width":"72 mm","title":"5SL4408-6","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Miniature circuit breaker 400 V 10kA, 4-pole, B, 8A","Halogen-Free":"Yes","Silicon-Free":"Yes","Number Of Poles":"4","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":"8 A","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","Number Of Poles / Note":"4P","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":"4","Tripping Characteristic Class":"B","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 (Operating Cycles) / Typical":"10 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/9100e56a614e6ff3a5b83a05355de6a8.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=79812&mlfb=5SL4408-6"},"ai":{"faq":[{"question":"What is the 5SL4408-6's breaking capacity?","answer":"The 5SL4408-6 has a 10 kA breaking capacity per both EN 60898 and IEC 60947-2 at 400 V AC."},{"question":"Will the 5SL4408-6 fit in a panel designed for the 5SL4363-7?","answer":"Both are 4-module-width SENTRON MCBs on the same DIN-rail footprint, so the 5SL4408-6 will physically drop into the same panel position. The difference is in ratings — the 5SL4363-7 is a 63 A C-curve, while this is an 8 A B-curve — so the circuit protection specs are different, but the mechanical fit is the same."},{"question":"How do I get current pricing and availability for the 5SL4408-6?","answer":"The 5SL4408-6 is sourced and quoted to order against an RFQ through independent distribution. Current pricing and availability are confirmed at quote time — submit an RFQ for a firm quote."},{"question":"What compliance documentation does Siemens provide for the 5SL4408-6?","answer":"The breaker is certified to EN 60898 and IEC 60947-2 for breaking capacity, rated overvoltage category III, pollution degree 2, and is halogen-free and silicon-free. Standard Siemens declarations of conformity and CE marking apply."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SL4408-6","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/5SL4408-6 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}}