{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SN6440-8CP","brand":"Siemens","brandSlug":"siemens","productSlug":"5SN6440-8CP","canonicalUrl":"https://aoctrl.com/siemens/5SN6440-8CP","factsUrl":"https://aoctrl.com/api/mcp/products/5SN6440-8CP","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SN series, 4-pole miniature circuit breaker, 400 VAC, 50 Hz, tripping characteristic C, 6 kA (EN 60898) / 10 kA (IEC 60947-2), order code 5SN6440-8CP.","salesMarkdown":"## What this 4-pole MCB does on your DIN rail The Siemens 5SN6440-8CP is a 4-pole miniature circuit breaker from the SENTRON 5SN series, rated 400 VAC at 50 Hz with a C tripping characteristic. Both ratings apply at 400 VAC — you get two SCCR figures from the same hardware, and the one that governs depends on which standard your local code or panel spec follows. The 6 kA (EN 60898) / 10 kA (IEC 60947-2) split is the single most important spec for panel coordination. EN 60898 is the residential-standard test sequence; IEC 60947-2 is the industrial standard with a higher let-through energy requirement. If your panel label calls out a 10 kA SCCR at 400 V, this breaker meets it — but only under the IEC 60947-2 clause. For a 6 kA requirement under either standard, it clears comfortably. The 4-pole configuration (3P+N or 4P depending on wiring) means it can switch all three phases plus the neutral, which is mandatory for TN-S or TN-C-S systems where the neutral must be disconnected on a multi-pole fault. The 72 VDC maximum rating matters if you are using the breaker in a DC sub-distribution panel — it is not a high-voltage DC breaker, so keep it on the AC side for 110 VDC or higher rails. Terminal capacity up to 35 mm² solid copper means it accepts standard panel feeder sizes without a reducer lug. The -40 °C to +75 °C ambient range covers unheated electrical rooms, outdoor enclosures in cold climates, and high-heat machine cabinets.","metaTitle":"Siemens 5SN6440-8CP 4-Pole MCB, 6 kA EN / 10 kA IEC, 400 VAC","metaDescription":"Siemens 5SN6440-8CP 4-pole miniature circuit breaker, 6 kA per EN 60898 / 10 kA per IEC 60947-2, rated 400 VAC 50 Hz. Active production. 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":"5SN6440-8CP","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":"10 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":"3 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/df0098ebe06d27d3549223ab74b8da07.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=1647320&mlfb=5SN6440-8CP"},"ai":{"faq":[{"question":"Where can I buy 5SN6440-8CP and get a price?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."},{"question":"Will 5SN6440-8CP drop into a panel specified around a 3-pole MCB like 5SL4363-7 without rewiring?","answer":"No — the 5SN6440-8CP is 4 poles wide (72 mm / 4 MW) versus 3 MW for the 5SL4363-7, so it needs one additional modular space on the DIN rail. The depth (76 mm) and height (90 mm) are identical, but the width difference means a panel layout change for the extra pole."},{"question":"What are the key ratings of the 5SN6440-8CP?","answer":"4-pole miniature circuit breaker, 400 VAC 50 Hz, C-curve, 6 kA per EN 60898 and 10 kA per IEC 60947-2, 72 VDC max, operating temperature -40 to +75 °C, accepts conductors up to 35 mm²."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SN6440-8CP","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/5SN6440-8CP 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}}