{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY8405-7","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY8405-7","canonicalUrl":"https://aoctrl.com/siemens/5SY8405-7","factsUrl":"https://aoctrl.com/api/mcp/products/5SY8405-7","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON series, miniature circuit breaker, 4-pole, 0.5 A rated current, C tripping characteristic, 70 kA breaking capacity per IEC 60947-2, 50/60 Hz, IP20 with connected conductors.","salesMarkdown":"Rated 0.5 A at 45 °C and derated to 0.49 A at 50 °C and 0.47 A at 55 °C, so if the enclosure runs warm, the actual continuous current it can carry drops; factor that into the load calculation if the panel is in a hot cabinet. ## Breaking capacity and selectivity in a real panel The 70 kA rating per IEC 60947-2 is the headline number, but the part also carries a 15 kA DC breaking capacity per the same standard and a 5 kA rating per UL 1077 and CSA C22.2 No. 235 — so it's certified for both IEC and North American panels, though the UL/CSA rating is lower and governs any listing in those jurisdictions. Vibration resistance tested to IEC 60068-2-6 at ±1 mm from 5 to 25 Hz and 50 m/s² from 25 to 150 Hz, so it holds up on a machine frame or in a mobile equipment panel, not just a stationary wall-mount board. ## Integration into a panel — dimensions and wiring Width is 72 mm (4 modular units), height 90 mm, depth 76 mm, installation depth 70 mm. Combined terminals on both top and bottom accept the same conductor range, and the part is sealable — useful for applications where the panel must be locked after commissioning to prevent tampering. Halogen-free and silicon-free construction matters in environments where outgassing from a fault could contaminate optics or electronics — think semiconductor fabs, medical device manufacturing, or cleanroom-adjacent panels.","metaTitle":"Siemens SENTRON 5SY8405-7 4-Pole MCB, C-Curve 0.5 A, 70 kA","metaDescription":"Siemens SENTRON 5SY8405-7 miniature circuit breaker, 4-pole, 0.5 A rated current, C tripping characteristic, 70 kA breaking capacity per IEC 60947-2. Active production. Available t","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":"5SY8405-7","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, C0.5","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":"C","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/bc589ebcf1a36b99e509978669aaf81a.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=119144&mlfb=5SY8405-7"},"ai":{"faq":[{"question":"What is the temperature range for 5SY8405-7?","answer":"The operating ambient temperature range is -40 °C to 75 °C, with humidity limits of 95% up to 55 °C, 55% up to 70 °C, and 35% up to 75 °C."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY8405-7","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/5SY8405-7 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}}