{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SN6140-7CN","brand":"Siemens","brandSlug":"siemens","productSlug":"5SN6140-7CN","canonicalUrl":"https://aoctrl.com/siemens/5SN6140-7CN","factsUrl":"https://aoctrl.com/api/mcp/products/5SN6140-7CN","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SN6140-7CN, miniature circuit breaker, 1-pole, C-curve, 40 A, 6 kA per EN 60898, 230/400 V AC.","salesMarkdown":"## Siemens SENTRON 5SN6140-7CN — 1-pole C-curve MCB at 40 A The Siemens 5SN6140-7CN is a SENTRON miniature circuit breaker rated 40 A with a C tripping characteristic, single-pole construction, and a 6 kA breaking capacity per EN 60898 at 230/400 V AC. Breaking capacity of 6 kA per EN 60898 at 230/400 V AC tells you this MCB can safely interrupt a fault current up to 6,000 A symmetrical. For industrial panels with higher fault capacity, you'd step to the IEC 60947-2 rating on a sibling like the 5SL series. Single-pole switching (1P) with no neutral conductor switching — the neutral is either a solid bus or a separate terminal block. Rated operational voltage covers 250 V AC single-phase and 440 V AC multi-phase, with a DC maximum of 72 V. That DC rating is low — this is an AC-optimized breaker; for DC circuits above 72 V, you need a DC-rated MCB. In a densely populated enclosure, that heat adds up — account for it in your thermal derating calculation, especially if ambient inside the panel exceeds 40 °C. Vibration resistance per IEC 60068-2-6 at 50 m/s² over 25 to 150 Hz means it holds calibration and contact stability under moderate vibration — fine for wall-mounted panels near rotating machinery, but not rated for direct mounting on a motor or compressor frame without additional damping. ## Deployment context Snap-on DIN-rail mounting in any position (vertical, horizontal, upside-down — the breaker operates identically). Accepts solid conductors up to 25 mm², which is generous for a 40 A circuit — typically you'd terminate 6 or 10 mm², but the larger terminal accommodates parallel feeds or looping through. The sealable feature allows the panel builder to lock the toggle position after commissioning — useful for critical circuits where unauthorized reset must be prevented. Rated for overvoltage category III (distribution board level) and pollution degree 2 (non-conductive pollution with occasional condensation). The manufacturer provides IEC/EN 60898 certification documentation; RoHS and REACH declarations are available through the standard Siemens documentation portal.","metaTitle":"Siemens 5SN6140-7CN SENTRON MCB, 1P C 40A 6kA","metaDescription":"Siemens SENTRON 5SN6140-7CN miniature circuit breaker, 1-pole, C-curve, 40A, 6kA breaking capacity per EN 60898. Active production. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["1-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Width":"18 mm","title":"5SN6140-7CN","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Circuit breaker 230/400V, 6kA, 1-pole, C, 40A","Halogen-Free":"Yes","Silicon-Free":"Yes","Design Of Pole":"1P","Number Of Poles":"1","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":"1","Tripping Characteristic Class":"C","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","with single-phase operation at AC rated value":"250 V","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":"3.3 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/d5a6829727670c9e42ff765d24f081d7.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=229208&mlfb=5SN6140-7CN"},"ai":{"faq":[{"question":"What is the breaking capacity of the 5SN6140-7CN?","answer":"6 kA per EN 60898 at 230/400 V AC. That is the standard breaking capacity for residential and commercial panels; for industrial applications requiring higher fault interruption, consider the 5SL series with a 10 kA rating per IEC 60947-2."},{"question":"Will the 5SN6140-7CN drop into a panel specified around the 5SL4363-7?","answer":"Not without rewiring. The 5SN6140-7CN is a 1-pole, 18 mm wide unit; the 5SL4363-7 is a 3-pole, 54 mm wide unit. The DIN-rail footprint is the same, but the pole count, width, and terminal arrangement differ. The 5SL4363-7 also carries a 10 kA breaking capacity per both EN 60898 and IEC 60947-2, versus 6 kA on the 5SN. They are not drop-in replacements."},{"question":"What compliance documentation does Siemens provide for the 5SN6140-7CN?","answer":"IEC/EN 60898 certification, RoHS and REACH declarations, and CE marking. The manufacturer's documentation portal provides the full compliance package."},{"question":"Where can I buy the 5SN6140-7CN and how is it quoted?","answer":"Sourced through independent industrial-automation distribution. Quoted to order against an RFQ — availability and current pricing are confirmed at quote time. No minimum order quantity restrictions on this standard catalog item."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SN6140-7CN","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/5SN6140-7CN 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}}