{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SN6404-8CP","brand":"Siemens","brandSlug":"siemens","productSlug":"5SN6404-8CP","canonicalUrl":"https://aoctrl.com/siemens/5SN6404-8CP","factsUrl":"https://aoctrl.com/api/mcp/products/5SN6404-8CP","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SN series MCB, 4-pole, C-curve, 400 V AC, 50 Hz, 6 kA per EN 60898 / 30 kA per IEC 60947-2, 4 modular width units.","salesMarkdown":"## What this 4-pole MCB brings to the panel It's rated 400 V AC at 50 Hz and carries two breaking capacity figures: 6 kA per EN 60898 for residential and light commercial branch circuits, and 30 kA per IEC 60947-2 for industrial panel coordination. The C-curve (trips at 5–10× rated current) is standard for motor and transformer loads with moderate inrush — common in conveyor drives, pump panels, and small machine tools. The 6 kA per EN 60898 covers standard residential/commercial duty; if your panel SCCR requirement is above 6 kA, the 30 kA figure is your proof point. Multi-phase and single-phase operation both max out at 440 V AC, so it handles 400 V line-to-line plus a 10% tolerance headroom. DC rated at 72 V maximum — useful if you're switching a DC control bus, but not a main DC traction breaker. Conductor cross-section up to 35 mm² solid — that's enough for a 50 A or 63 A feed on the line side, well above typical MCB terminal capacity. Mechanical service life of 10 000 operating cycles — standard for this class, and fine for a panel that sees daily switching. Width is 72 mm (4 modular units). Standard DIN-rail mount — clips on, no tools. The 70 mm installation depth means it clears most shallow enclosures; check your back-of-panel clearance against that figure, not the 76 mm overall depth (the extra 6 mm is the front toggle overhang).","metaTitle":"Siemens 5SN6404-8CP MCB 4P C-Curve 400V 6kA/30kA","metaDescription":"Siemens 5SN6404-8CP 4-pole MCB, C-curve, 400 V AC, 6 kA (EN 60898) / 30 kA (IEC 60947-2). Active lifecycle. Sourced to order against 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":"5SN6404-8CP","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","description":"MCB 5SN","Number Of Poles":"4","lifecycle_stage":"current","Installation Depth":"70 mm","at DC rated value maximum":"72 V","Number Of Modular Width Units":"4","supply voltage at AC rated value":"400 V","according to EN 60898 rated value":"6 kA","Supply Voltage Frequency Rated Value":"50 Hz","according to IEC 60947-2 rated value":"30 kA","with multi-phase operation at AC maximum":"440 V","with multi-phase operation at AC rated value":"440 V","with single-phase operation at AC rated value":"440 V","Connectable Conductor Cross-Section Solid Maximum":"35 mm²","Mechanical Service Life (Operating Cycles) Typical":"10 000","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/f6719e86eb4f9240c98322f9f04d3d6a.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=1647306&mlfb=5SN6404-8CP"},"ai":{"faq":[{"question":"Where can I buy 5SN6404-8CP and get a price?","answer":"We source and quote it to order against an RFQ. Availability and current pricing are confirmed at quote time — submit an RFQ through the page."},{"question":"Will 5SN6404-8CP drop into a panel specified around 5SL4363-7 without rewiring?","answer":"Not without a wiring change. The 5SL4363-7 is a 3-pole unit (54 mm wide, 3 MW), while the 5SN6404-8CP is 4-pole (72 mm wide, 4 MW). Same 76 mm depth and 90 mm height, but you need an extra 18 mm of DIN-rail space and a fourth conductor connection. If the original panel had a 3-pole breaker feeding a 3-phase load with no neutral switching, the 4-pole unit adds a switched neutral — verify if that's required or acceptable."},{"question":"What compliance documentation does Siemens provide for 5SN6404-8CP?","answer":"The 5SN series carries IEC/EN 60898-1 and IEC 60947-2 certifications. For RoHS, REACH, and specific UL/CSA documentation, request the manufacturer's declaration of conformity with your RFQ — it's typically available as a digital download from Siemens' support portal."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SN6404-8CP","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/5SN6404-8CP 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}}