{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY8404-7","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY8404-7","canonicalUrl":"https://aoctrl.com/siemens/5SY8404-7","factsUrl":"https://aoctrl.com/api/mcp/products/5SY8404-7","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY8404-7, 4-pole miniature circuit breaker, C-curve, 4 A AC, 50 kA breaking capacity per IEC 60947-2, 4 modular width units.","salesMarkdown":"That C-curve means it handles moderate inrush — typical for motor starters, contactor coils, and small transformer loads — without nuisance trips, while still clearing short circuits fast. The 4-module width (72 mm) and 76 mm depth fit standard distribution boards. With connected conductors the IP20 protection is typical for enclosed panel use. ## Derating and ambient conditions Rated current holds at 4 A up to 45 °C, then derates to 3.9 A at 50 °C and 3.8 A at 55 °C. The surrounding temperature influence curve (max 95% RH to 55 °C, 55% RH to 70 °C, 35% RH to 75 °C) means this breaker can live in a hot panel corner without false tripping, provided humidity stays within the envelope. Vibration resistance per IEC 60068-2-6 (±1 mm at 5–25 Hz, 50 m/s² at 25–150 Hz) confirms it holds up on machine-mounted enclosures.","metaTitle":"Siemens 5SY8404-7 SENTRON MCB, 4A C-Curve 4P 50kA","metaDescription":"Siemens 5SY8404-7 SENTRON 4-pole C-curve MCB, 4 A AC, 50 kA breaking capacity per IEC 60947-2. Quoted 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":"5SY8404-7","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, C4","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":"4 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":"4 A","at 50 °C / rated value":"3.9 A","at 55 °C / rated value":"3.8 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/da2c8e914e85efb4e0c8d6eba11f6bf6.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=10976&mlfb=5SY8404-7"},"ai":{"faq":[{"question":"What is the breaking capacity of 5SY8404-7?","answer":"Per IEC 60947-2, the rated breaking capacity is 50 kA at AC and 15 kA at DC."},{"question":"Where can I buy 5SY8404-7?","answer":"It is sourced and quoted to order against an RFQ through independent distribution; availability and current pricing are confirmed at quote time."},{"question":"What is the depth of 5SY8404-7?","answer":"The depth is 76 mm, with an installation depth of 70 mm."},{"question":"What compliance documentation does Siemens provide for 5SY8404-7?","answer":"The breaker is halogen-free and silicon-free, and carries the F designation per EN 61346-2 and IEC 81346-2. Specific RoHS/REACH/UL declarations are available from Siemens on request."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY8404-7","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/5SY8404-7 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}}