{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SN6403-7CP","brand":"Siemens","brandSlug":"siemens","productSlug":"5SN6403-7CP","canonicalUrl":"https://aoctrl.com/siemens/5SN6403-7CP","factsUrl":"https://aoctrl.com/api/mcp/products/5SN6403-7CP","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SN series, 5SN6403-7CP, 4-pole miniature circuit breaker, C-curve, 400 V AC, 6 kA per EN 60898, 30 kA per IEC 60947-2, 4 modular width units.","salesMarkdown":"The Siemens 5SN6403-7CP is a 4-pole miniature circuit breaker from the SENTRON 5SN series, rated for 400 V AC supply voltage at 50 Hz with a C-curve tripping characteristic. The 90 mm height matches the SENTRON compact family, so it rows cleanly alongside other 5SN or 5SL series breakers in a multi-way distribution board. Terminal capacity accepts solid conductors up to 35 mm² — sized for the incoming feed on a 4-pole submain. ## Breaking capacity and standard compliance Two breaking-capacity ratings apply depending on the installation standard. Under EN 60898 (household and similar installations) the breaker is rated 6 kA. Under IEC 60947-2 (industrial switchgear and controlgear) the rating rises to 30 kA — this is the figure a panel builder references when the breaker sits in an industrial distribution board with a transformer-fed bus. ## Environmental range and mechanical endurance","metaTitle":"Siemens 5SN6403-7CP MCB 4P C-Curve, 6kA EN 60898, 30kA IEC 6","metaDescription":"Siemens SENTRON 5SN6403-7CP 4-pole miniature circuit breaker, C-curve, 400V AC, 6kA per EN 60898, 30kA per IEC 60947-2. Current 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":"5SN6403-7CP","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":"1.3 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/fd141d123fe2aed8602a0774c1b58f8e.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=1647303&mlfb=5SN6403-7CP"},"ai":{"faq":[{"question":"What is 5SN6403-7CP's breaking capacity under industrial standards?","answer":"Per IEC 60947-2 the breaker is rated 30 kA, which is the relevant figure for industrial distribution boards. Under EN 60898 for residential/commercial it is rated 6 kA."},{"question":"Will 5SN6403-7CP drop into a panel specified around 5SL4363-7 without rewiring?","answer":"No — the 5SN6403-7CP is 4-pole and 72 mm wide (4 modular units), while the 5SL4363-7 is 3-pole and 54 mm wide (3 units). The panel would need a wider DIN-rail slot and an additional neutral conductor termination."},{"question":"Where can I buy 5SN6403-7CP and how is it quoted?","answer":"Sourced and quoted to order against an RFQ through independent distribution channels. Availability and current pricing are confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SN6403-7CP","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/5SN6403-7CP 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}}