{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY8406-7","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY8406-7","canonicalUrl":"https://aoctrl.com/siemens/5SY8406-7","factsUrl":"https://aoctrl.com/api/mcp/products/5SY8406-7","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY8406-7, 4-pole miniature circuit breaker, C-curve 6 A, 50 kA breaking capacity per IEC 60947-2 at 400 V AC, 4 MW units.","salesMarkdown":"The Siemens 5SY8406-7 is a SENTRON 4-pole miniature circuit breaker rated 6 A with a C-curve trip characteristic, designed for mechanical engineering and industrial panel applications. Its 50 kA breaking capacity at 400 V AC (per IEC 60947-2) means it can safely interrupt high fault currents without cascading upstream — a key spec for high-available-fault panels where a standard 10 kA MCB would weld closed. Depth is 76 mm, installation depth 70 mm — that 6 mm difference is the front toggle overhang, so plan gland-plate clearance for the full 76 mm. Mounting position any, which helps in tight enclosures where you're stacking breakers sideways. ## Thermal derating and environmental limits Rated 6 A at 45 °C ambient; at 50 °C it derates to 5.85 A, and at 55 °C to 5.69 A. That's about 2.5% drop per 5 °C above 45 °C — plan your panel internal temperature if you're loading all four poles near the limit. Ambient range is -40 °C to 75 °C, with humidity limits: 95% RH up to 55 °C, tapering to 35% RH at 75 °C.","metaTitle":"Siemens 5SY8406-7 SENTRON MCB, 4P C-Curve 6A, 50kA","metaDescription":"Siemens 5SY8406-7 SENTRON 4-pole miniature circuit breaker, 6A C-curve, 50kA breaking capacity at 400V AC. Active production. Sourced to order against RFQ.","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":"5SY8406-7","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Miniature circuit breaker 400 V D=70 mm 25 kA according to EN 60947-2, 4P, C6","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":"6 A","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","Combined Terminal Top":"Yes","according to EN 61346-2":"F","at 45 °C / rated value":"6 A","at 50 °C / rated value":"5.85 A","at 55 °C / rated value":"5.69 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 IEC 60947-2 / rated value":"50 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/a1c31c31c08b2fb22dcbdd528ea58e15.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=85794&mlfb=5SY8406-7"},"ai":{"faq":[{"question":"What is the breaking capacity of 5SY8406-7?","answer":"50 kA at 400 V AC per IEC 60947-2, and 15 kA at 72 V DC per IEC 60947-2. That 50 kA rating is the key spec for high-fault-current panels."},{"question":"How do I get current pricing and availability for 5SY8406-7?","answer":"Submit an RFQ through this listing. The part is sourced to order through independent distribution; current pricing and stock levels are confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY8406-7","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/5SY8406-7 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}}