{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY4140-6","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY4140-6","canonicalUrl":"https://aoctrl.com/siemens/5SY4140-6","factsUrl":"https://aoctrl.com/api/mcp/products/5SY4140-6","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY4140-6, 1-pole miniature circuit breaker, B-curve, 40 A rated, 10 kA (IEC 60898-1) / 15 kA (IEC 60947-2), 18 mm wide, IP20.","salesMarkdown":"## Siemens 5SY4140-6 — B-curve 40 A MCB, dual-standard breaking capacity It carries a 10 kA breaking capacity per IEC/EN 60898-1 and a 15 kA rating per IEC 60947-2 / UL1077, so it covers both residential-distribution board specs and industrial panel SCCR requirements under a single order code. At 40 A it is a common feeder or submain breaker in a 1-MW (18 mm) footprint. ## Temperature derating — what the 40 A rating actually delivers The 40 A rating holds at 35 °C ambient. Above that it derates linearly: 37.56 A at 40 °C, 36.28 A at 45 °C, 34.96 A at 50 °C, 33.6 A at 55 °C, and 32.16 A at 60 °C. If the panel ambient runs at 50 °C, plan for a 35 A continuous load, not 40 A. ## Dual-standard breaking capacity — panel vs. distribution board Rated 10 kA under IEC/EN 60898-1 (the standard for household and similar installations) and 15 kA under IEC 60947-2 / UL1077 (industrial control-panel standard). ## Panel fit — 1 MW wide, 76 mm deep, any mounting position The quick-assembly fastening system snaps onto the rail without tools. Mounting position is unrestricted — vertical, horizontal, or flat — which simplifies layout in crowded enclosures. Certified to IEC/EN 60898-1 and IEC 60947-2 / UL1077. Halogen-free and silicon-free construction. Energy limitation class 3. Sealable terminals (top and bottom combined terminals) allow tamper-proofing in metered or safety-critical circuits. The surrounding temperature influence spec (max 95% RH to 55 °C, derating above) is standard for this class.","metaTitle":"Siemens 5SY4140-6 SENTRON MCB, 1P B-Curve 40A 10kA IEC","metaDescription":"Siemens 5SY4140-6 SENTRON miniature circuit breaker, 1-pole B-curve 40 A, 10 kA per IEC/EN 60898-1, 15 kA per IEC 60947-2. Current production. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["1-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Width":"18 mm","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","Standard":"IEC / EN 60898-1, IEC / EN 60947-2 / UL1077","Halogen-Free":"Yes","Silicon-Free":"Yes","Design Of Pole":"1P","Number Of Poles":"1","lifecycle_stage":"current","Fastening Method":"Quick assembly system","Mounting Position":"any","at AC rated value":"40 A","Installation Depth":"70 mm","Product Brand Name":"SENTRON","Degree Of Pollution":"3","Product Designation":"Miniature circuit breaker","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","Combined Terminal Top":"Yes","at 35 °C rated value":"40 A","at 40 °C rated value":"37.56 A","at 45 °C rated value":"36.28 A","at 50 °C rated value":"34.96 A","at 55 °C rated value":"33.6 A","at 60 °C rated value":"32.16 A","Energy Limitation Class":"3","according to EN 61346-2":"F","Combined Terminal Bottom":"Yes","according to IEC 81346-2":"F","Suitability For Operation":"Mechanical engineering / industry","Neutral Conductor Switching":"No","Number Of Modular Width Units":"1","Position Of Power Supply Cord":"Any","Tripping Characteristic Class":"B","according to EN 60898 rated value":"10 kA","according to IEC 60947-2 rated value":"15 kA","Influence Of The Surrounding Temperature":"max. 95% to 55°C, max. 55% to 70°C, max. 35% to 75°C","Type Of Voltage Of The Operating Voltage":"AC","at DC according to IEC 60947-2 rated value":"15 kA","Value Range Of The Supply Voltage Frequency":"50/60 Hz","operating voltage at DC rated value maximum":"72 V","with multi-phase operation at AC rated value":"440 V","with single-phase operation at AC rated value":"440 V","at AC according to UL 1077 and CSA C22.2 No.235":"5 kA","vibration resistance according to IEC 60068-2-6":"±1mm at 5 to 25Hz; 50m/s² at 25 to 150Hz","Mechanical Service Life (Operating Cycles) Typical":"10 000","Product Extension Installable Supplementary Devices":"Yes","supply voltage with single-phase operation at AC rated value":"230 V","power loss [W] for rated value of the current at AC in hot operating state per pole":"3.6 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/f86bab4d699f702fb00c5b95057e4842.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=412702&mlfb=5SY4140-6","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SY4140-6/alternatives.json"},"ai":{"faq":[{"question":"What is the breaking capacity of 5SY4140-6?","answer":"10 kA per IEC/EN 60898-1 and 15 kA per IEC 60947-2 / UL1077. The 15 kA rating is the one to use for industrial panel SCCR calculations."},{"question":"What is the difference between 5SY4140-6 and 5SY4140-7?","answer":"Both are 1-pole 40 A SENTRON MCBs. The 5SY4140-6 has a B-curve (3–5× In); the 5SY4140-7 has a C-curve (5–10× In). The -6 is for resistive and general loads; the -7 is for moderate inrush loads like small motors or banks of LED drivers. They share the same footprint, breaking capacity, and terminal layout — no rewiring needed to swap one for the other, but the trip curve must match the load type."},{"question":"Where can I buy 5SY4140-6?","answer":"Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."},{"question":"What compliance documentation does Siemens provide for 5SY4140-6?","answer":"The MCB carries certifications to IEC/EN 60898-1 and IEC 60947-2 / UL1077. It is halogen-free and silicon-free. Standard Siemens documentation includes the declaration of conformity and the datasheet with the full derating curves."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY4140-6","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/5SY4140-6 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-09-02T08:15:54.622Z","lastPublished":"2026-09-02T08:15:54.622Z","indexable":true}}