{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY8405-8","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY8405-8","canonicalUrl":"https://aoctrl.com/siemens/5SY8405-8","factsUrl":"https://aoctrl.com/api/mcp/products/5SY8405-8","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON miniature circuit breaker, 4-pole, D characteristic, 0.5 A, 70 kA IEC breaking capacity, 5SY8405-8.","salesMarkdown":"The 72 mm width (4 modular units) and 76 mm depth fit standard 36 mm-wide module spacing — plan for a 4-pole slot in the distribution board. IP20 rating applies with connected conductors; the touch-protection feature means finger-safe terminals when wired. At DC (per IEC 60947-2) it is rated 15 kA; under UL 1077 / CSA C22.2 No. 235 it is 5 kA. The 70 kA figure means it can be installed at the service entrance or on a high-fault bus without requiring a current-limiting upstream fuse. Temperature derating is published: at 45 °C the rating holds at 0.5 A; at 50 °C it drops to 0.49 A; at 55 °C to 0.47 A. Ambient humidity limits are specified per the surrounding-temperature influence table. Vibration resistance per IEC 60068-2-6: ±1 mm at 5–25 Hz, 50 m/s² at 25–150 Hz. These matter for installation on a machine frame or near rotating equipment.","metaTitle":"Siemens 5SY8405-8 SENTRON MCB, 4P, D Curve, 0.5 A, 70 kA","metaDescription":"Siemens 5SY8405-8 SENTRON miniature circuit breaker, 4-pole, D tripping characteristic, 0.5 A rated, 70 kA breaking capacity per IEC 60947-2. Active production. Quoted 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":"5SY8405-8","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, D0.5","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":"0.5 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 45 °C / rated value":"0.5 A","at 50 °C / rated value":"0.49 A","at 55 °C / rated value":"0.47 A","Combined Terminal Bottom":"Yes","Suitability For Operation":"Mechanical engineering / industry","Number Of Modular Width Units":"4","Tripping Characteristic Class":"D","Position / Of Power Supply Cord":"Any","acc. to IEC 60947-2 / rated value":"70 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/3e966591ca239fd915d2d87c70646ed2.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=134120&mlfb=5SY8405-8"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY8405-8","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/5SY8405-8 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}}