{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SN6440-6CN","brand":"Siemens","brandSlug":"siemens","productSlug":"5SN6440-6CN","canonicalUrl":"https://aoctrl.com/siemens/5SN6440-6CN","factsUrl":"https://aoctrl.com/api/mcp/products/5SN6440-6CN","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SN6440-6CN, miniature circuit breaker, 4-pole, B characteristic, 40 A rated current, 6 kA breaking capacity at 400 V AC per EN 60898, 4 MW units wide.","salesMarkdown":"## What it is and what it does The Siemens 5SN6440-6CN is a 4-pole SENTRON miniature circuit breaker with a B tripping characteristic, rated 40 A at 400 V AC, 50/60 Hz. Its 6 kA breaking capacity per EN 60898 covers standard residential and commercial branch circuit protection. The B curve means it trips between 3 and 5 times rated current — suited for resistive and general-purpose loads where inrush is low, not for motor starting or transformer primaries. ## Fit and footprint At 72 mm wide (4 modular width units), it occupies four standard 18 mm DIN-rail slots. Depth is 76 mm, installation depth 70 mm. Mounting position is any, so it works in horizontal or vertical panel layouts. The IP20 rating (with connected conductors) is typical for enclosed distribution boards — not for wet or outdoor locations without a secondary enclosure. ## What the ratings mean for your panel The 6 kA rated short-circuit capacity per EN 60898 at 400 V AC means it safely interrupts fault currents up to that level. Overvoltage category III and pollution degree 2 suit it for fixed-installation distribution boards. Energy limitation class 3 means it lets through less let-through energy than class 1 or 2 breakers — better for protecting downstream equipment. The 3.4 W power loss per pole at rated current in hot state matters for thermal budgeting in a crowded enclosure.","metaTitle":"Siemens 5SN6440-6CN SENTRON MCB, 40A 4P B-curve 6kA","metaDescription":"Siemens 5SN6440-6CN SENTRON miniature circuit breaker, 40A, 4-pole, B characteristic, 6kA per EN 60898 at 400V AC. Current production, sourced to order. Request quote.","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":"5SN6440-6CN","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Circuit breaker 400V, 6kA, 4-pole, B, 40A","Halogen-Free":"Yes","Silicon-Free":"Yes","Design Of Pole":"4P","Number Of Poles":"4","lifecycle_stage":"current","Mounting Position":"any","Installation Depth":"70 mm","Product Brand Name":"SENTRON","Degree Of Pollution":"2","Product Designation":"Miniature circuit breaker","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","Energy Limitation Class":"3","at DC rated value maximum":"72 V","Number Of Modular Width Units":"4","Tripping Characteristic Class":"B","Product Feature Touch Protection":"Yes","supply voltage at AC rated value":"400 V","according to EN 60898 rated value":"6 kA","Supply Voltage Frequency Rated Value":"50 Hz","Influence Of The Surrounding Temperature":"Periodically +55°C, max. 95% humidity","Type Of Voltage Of The Operating Voltage":"AC","with multi-phase operation at AC maximum":"440 V","Value Range Of The Supply Voltage Frequency":"50/60 Hz","with multi-phase operation at AC rated value":"440 V","Product Component Neutral Conductor Switching":"No","vibration resistance according to IEC 60068-2-6":"50 m/s² at 25 to 150 Hz","Connectable Conductor Cross-Section Solid Maximum":"25 mm²","Product Extension Installable Supplementary Devices":"Yes","power loss [W] for rated value of the current at AC in hot operating state per pole":"3.4 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/e5c8ae3b35f8952d3ab408103a471068.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=377634&mlfb=5SN6440-6CN"},"ai":{"faq":[{"question":"Where can I buy 5SN6440-6CN and how do I get a price?","answer":"The part is sourced and quoted to order against an RFQ through independent distribution. Submit a request for quote; availability and current pricing are confirmed at quote time."},{"question":"Will 5SN6440-6CN drop into a panel that was specified around 5SL4363-7 without rewiring?","answer":"No. The 5SN6440-6CN is 72 mm wide (4 MW units) versus 54 mm (3 MW) for the 5SL4363-7. It also has 4 poles instead of 3 and a B curve instead of C. The panel would need mechanical modification and circuit reconfiguration."},{"question":"What compliance documentation does Siemens provide for 5SN6440-6CN?","answer":"The product is halogen-free and silicon-free. Standard documentation includes the datasheet, declaration of conformity per EN 60898, and material compliance declarations (RoHS, REACH) available on request."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SN6440-6CN","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/5SN6440-6CN 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}}