{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY7406-8","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY7406-8","canonicalUrl":"https://aoctrl.com/siemens/5SY7406-8","factsUrl":"https://aoctrl.com/api/mcp/products/5SY7406-8","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY7406-8, 4-pole miniature circuit breaker, D characteristic, 6 A rated current, 15 kA breaking capacity per EN 60898, 40 kA per IEC 60947-2, 4 MW.","salesMarkdown":"## Siemens 5SY7406-8 SENTRON 4-Pole MCB, D Curve, 6 A ## Breaking Capacity & Standards It also carries a DC rating of 15 kA per IEC 60947-2. ## Thermal Derating & Ambient Conditions The 6 A rating holds at 35 °C ambient. Above that, derate linearly: 5.56 A at 45 °C, 5.41 A at 50 °C, 5.25 A at 55 °C, and 5.09 A at 60 °C. For a panel running warm — say 50 °C internal ambient — the effective continuous current is 5.41 A, not the nameplate 6 A. The operating range spans -40 °C to 75 °C, with humidity limits that step down at higher temperatures (95% RH up to 55 °C, then 55% RH to 70 °C, then 35% RH to 75 °C). ## Mounting & Integration Mounting position is any orientation. Width is 72 mm (4 MW). Touch protection is provided. The unit is sealable for tamper-evident applications. Halogen-free and silicon-free construction supports use in clean environments where outgassing must be minimized.","metaTitle":"Siemens 5SY7406-8 SENTRON MCB, 4P, D Curve, 6 A, 15/40 kA","metaDescription":"Siemens 5SY7406-8 SENTRON miniature circuit breaker, 4-pole, D tripping characteristic, 6 A rated current, 15 kA (EN 60898) / 40 kA (IEC 60947-2). Current production. Quoted to ord","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":"5SY7406-8","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Miniature circuit breaker 400 V 15kA, 4-pole, D, 6 A, D=70 mm","Halogen-Free":"Yes","Silicon-Free":"Yes","Number Of Poles":"4","Type Of Voltage":"AC","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","acc. to IEC 81346-2":"F","at AC / rated value":"6 A","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","Combined Terminal Top":"Yes","Number Of Poles / Note":"4P","acc. to DIN EN 61346-2":"F","at 35 °C / rated value":"6 A","at 45 °C / rated value":"5.56 A","at 50 °C / rated value":"5.41 A","at 55 °C / rated value":"5.25 A","at 60 °C / rated value":"5.09 A","Combined Terminal Bottom":"Yes","Suitability For Operation":"Mechanical engineering / industry","Number Of Modular Width Units":"4","Tripping Characteristic Class":"D","acc. to EN 60898 / rated value":"15 kA","Position / Of Power Supply Cord":"Any","acc. to IEC 60947-2 / rated value":"40 kA","Product Feature / Touch Protection":"Yes","Supply Voltage Frequency / Rated Value":"50/60 Hz","Influence Of The Surrounding Temperature":"max. 95% to 55°C, max. 55% to 70°C, max. 35% to 75°C","at DC / acc. to IEC 60947-2 / rated value":"15 kA","at AC / acc. to UL 1077 and CSA C22.2 No.235":"5 kA","vibration resistance / acc. to IEC 60068-2-6":"±1mm at 5 to 25Hz; 50m/s² at 25 to 150Hz","Product Function / Neutral Conductor Switching":"No","with multi-phase operation / at AC / rated value":"440 V","operating voltage / at DC / rated value / maximum":"72 V","with single-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/d493d0454f6892d8985697b06d51efe3.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=98843&mlfb=5SY7406-8"},"ai":{"faq":[{"question":"What are the key ratings of 5SY7406-8?","answer":"4-pole, D curve, 6 A rated current at 35 °C, 15 kA breaking capacity per EN 60898, 40 kA per IEC 60947-2, 15 kA DC per IEC 60947-2."},{"question":"What is the breaking capacity of 5SY7406-8 under IEC 60947-2?","answer":"40 kA at AC, and 15 kA at DC, both per IEC 60947-2."},{"question":"What is the physical size of 5SY7406-8?","answer":"Width 72 mm (4 modular units), depth 76 mm, height 90 mm, installation depth 70 mm."},{"question":"Where can I buy 5SY7406-8 and get current pricing?","answer":"Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY7406-8","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/5SY7406-8 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}}