{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY6408-7","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY6408-7","canonicalUrl":"https://aoctrl.com/siemens/5SY6408-7","factsUrl":"https://aoctrl.com/api/mcp/products/5SY6408-7","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY6408-7, 4-pole miniature circuit breaker, C-curve, 8 A rated, 6 kA per EN 60898 / 15 kA per IEC 60947-2, 4 MW, IP20.","salesMarkdown":"It's a current-production part — no lifecycle concerns for a BOM freeze. Rated breaking capacity is 6 kA per EN 60898-1 and 15 kA per IEC 60947-2 / UL1077 — the higher figure matters when you need SCCR headroom for a 400 V industrial panel. ## Derating and environment At 35 °C ambient it carries the full 8 A; at 40 °C it's 7.51 A, at 50 °C it's 6.99 A, and at 55 °C it's 6.72 A. If your panel runs hot, size the load to the derated number, not the nameplate. Halogen-free and silicon-free construction, sealable for lockout/tagout. Overvoltage category III and energy limitation class 3.","metaTitle":"Siemens 5SY6408-7 SENTRON MCB, 4P C-Curve 8A, 6/15kA","metaDescription":"Siemens 5SY6408-7 SENTRON miniature circuit breaker, 4-pole, C-curve, 8A rated, 6kA (EN 60898) / 15kA (IEC 60947-2), IP20. Current-production part sourced to order. Request quote.","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":"5SY6408-7","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","Standard":"IEC / EN 60898-1, IEC / EN 60947-2 / UL1077","description":"Miniature circuit breaker 400 V 6kA, 4-pole, C, 8A, D=70 mm","Halogen-Free":"Yes","Silicon-Free":"Yes","Design Of Pole":"4P","Number Of Poles":"4","lifecycle_stage":"current","Fastening Method":"Quick assembly system","Mounting Position":"any","Installation Depth":"70 mm","Product Brand Name":"SENTRON","Degree Of Pollution":"3","Product Designation":"Miniature circuit breaker","at AC / rated value":"8 A","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","Combined Terminal Top":"Yes","Energy Limitation Class":"3","according to EN 61346-2":"F","at 35 °C / rated value":"8 A","at 40 °C / rated value":"7.51 A","at 45 °C / rated value":"7.26 A","at 50 °C / rated value":"6.99 A","at 55 °C / rated value":"6.72 A","Combined Terminal Bottom":"Yes","according to IEC 81346-2":"F","Suitability For Operation":"Mechanical engineering / industry","Neutral Conductor Switching":"No","Number Of Modular Width Units":"4","Tripping Characteristic Class":"C","Position / Of Power Supply Cord":"Any","according to EN 60898 / rated value":"6 kA","according to IEC 60947-2 / rated value":"15 kA","Influence Of The Surrounding Temperature":"max. 95% to 55°C, max. 55% to 70°C, max. 35% to 75°C","Type Of Voltage / Of The Operating Voltage":"AC","Value Range / Of The Supply Voltage Frequency":"50/60 Hz","at DC / according to IEC 60947-2 / rated value":"15 kA","with multi-phase operation / at AC / rated value":"440 V","operating voltage / at DC / rated value / maximum":"72 V","vibration resistance / according to IEC 60068-2-6":"±1mm at 5 to 25Hz; 50m/s² at 25 to 150Hz","with single-phase operation / at AC / rated value":"440 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/490a29fc54c0fbb76e196a1bf6c31c0f.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=375743&mlfb=5SY6408-7"},"ai":{"faq":[{"question":"What is the breaking capacity of 5SY6408-7?","answer":"6 kA per EN 60898-1 and 15 kA per IEC 60947-2 / UL1077. The 15 kA rating is the one to use for SCCR calculations in industrial gear."},{"question":"What is the C-curve on this MCB?","answer":"The C characteristic trips between 5 and 10 times rated current (40–80 A for this 8 A unit). It's the standard choice for motor and transformer branch circuits where a short inrush is expected."},{"question":"Where can I buy 5SY6408-7?","answer":"It's sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — send a request and I'll get you a number."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY6408-7","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/5SY6408-7 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}}