{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY6406-8CC","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY6406-8CC","canonicalUrl":"https://aoctrl.com/siemens/5SY6406-8CC","factsUrl":"https://aoctrl.com/api/mcp/products/5SY6406-8CC","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY6406-8CC, miniature circuit breaker, 4-pole, D tripping characteristic, 6 A, 6 kA breaking capacity at 400 V AC, 4 modular width units.","salesMarkdown":"## What the ratings mean for fit The 5SY6406-8CC is a SENTRON miniature circuit breaker with a D tripping characteristic, 4 poles, rated 6 A at 400 V AC. The D-curve means it tolerates high inrush currents — typically 10–20× the rated current for short durations — so it's the right choice for motor circuits, transformers, or other inductive loads that draw a heavy startup surge without tripping on the magnetic release. The 6 kA breaking capacity per EN 60898 covers most industrial distribution panels; if your fault current exceeds that, you'll need an upstream current-limiting device. The 4-pole design switches all phases plus the neutral (though neutral is not switched separately — it's a solid neutral through the breaker). ## Deployment context Snaps onto a DIN rail via the quick-assembly system, occupying 4 modular width units (72 mm wide). Mounting position is any orientation, which simplifies panel layout. The IP20 rating (with connected conductors) means it's intended for enclosed distribution boards — not for washdown or outdoor exposure. Pollution degree 3 and overvoltage category III suit it for fixed industrial installations where conductive dust or transient surges are present. ## Approvals and compliance Rated breaking capacity is 6 kA per EN 60898 and 5 kA per UL 1077 / CSA C22.2 No.235. The breaker is halogen-free and silicon-free, which matters for panels in clean-room or corrosive environments. Sealable terminals allow lockout/tagout compliance. Vibration resistance per IEC 60068-2-6 covers ±1 mm at 5–25 Hz and 50 m/s² at 25–150 Hz — enough for machine-mounted panels.","metaTitle":"Siemens 5SY6406-8CC SENTRON MCB, 4P D 6A 6kA","metaDescription":"Siemens SENTRON 5SY6406-8CC miniature circuit breaker, 4-pole, D-curve, 6 A, 6 kA per EN 60898, 400 V AC. Current lifecycle. Sourced to order. Request RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["4-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Width":"72 mm","title":"5SY6406-8CC","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Miniature circuit breaker 400 V 6kA, 4-pole, D, 6A","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","at AC rated value":"400 V","Installation Depth":"70 mm","Product Brand Name":"SENTRON","Degree Of Pollution":"3","Product Designation":"Miniature circuit breaker","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","Combined Terminal Top":"Yes","Combined Terminal Bottom":"Yes","Suitability For Operation":"Mechanical engineering / industry","Neutral Conductor Switching":"No","Number Of Modular Width Units":"4","Position Of Power Supply Cord":"Any","Tripping Characteristic Class":"D","according to EN 60898 rated value":"6 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","operating voltage at DC rated value maximum":"72 V","with multi-phase operation at AC rated value":"440 V","with single-phase operation at AC rated value":"440 V","at AC according to UL 1077 and CSA C22.2 No.235":"5 kA","vibration resistance according to IEC 60068-2-6":"±1mm at 5 to 25Hz; 50m/s² at 25 to 150Hz","Mechanical Service Life (Operating Cycles) Typical":"10 000","Product Extension Installable Supplementary Devices":"Yes","power loss [W] for rated value of the current at AC in hot operating state per pole":"1.2 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/0b483cb0a79ff717f86a3b1767682f46.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=366085&mlfb=5SY6406-8CC"},"ai":{"faq":[{"question":"What is 5SY6406-8CC's listed depth (76 mm) on this component line?","answer":"The overall depth is 76 mm; the installation depth (behind the panel face) is 70 mm."},{"question":"What is 5SY6406-8CC's listed width (72 mm) on this component line?","answer":"The width is 72 mm, which corresponds to 4 modular width units on a standard DIN-rail mounting grid."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY6406-8CC","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/5SY6406-8CC 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}}