{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY4140-8","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY4140-8","canonicalUrl":"https://aoctrl.com/siemens/5SY4140-8","factsUrl":"https://aoctrl.com/api/mcp/products/5SY4140-8","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY4140-8, D-curve miniature circuit breaker, 1-pole, 400 V AC, 10 kA (EN 60898) / 15 kA (IEC 60947-2), 18 mm wide, IP20.","salesMarkdown":"The Siemens SENTRON 5SY4140-8 is a 1-pole miniature circuit breaker with a D tripping characteristic, rated 400 V AC (60 V DC) and carrying a 10 kA breaking capacity per EN 60898-1 and 15 kA per IEC 60947-2. The D-curve means it tolerates high inrush currents — typically motor starts, transformer energization, or capacitive loads — without nuisance tripping, making it a fit for industrial and mechanical-engineering panels where inductive loads dominate. At 18 mm wide (1 MWU), it snaps onto a DIN rail via the quick-assembly system and mounts in any position, which simplifies dense panel layouts. The IP20 rating with connected conductors means it is protected against finger contact but not washdown — standard for enclosed distribution boards. ## Breaking capacity and standards coverage The 5SY4140-8 is dual-rated: 10 kA under EN 60898-1 (the residential/commercial standard) and 15 kA under IEC 60947-2 (the industrial standard). It also carries a 15 kA DC rating per IEC 60947-2 at 60 V DC, and a 5 kA rating per UL 1077 / CSA C22.2 No.235 for North American supplementary protection. This triple-jurisdiction coverage (IEC/EN, UL, CSA) simplifies BOM harmonization across plants in different regions. Pollution degree 3 and overvoltage category III mean it is rated for the harsh electrical environment inside an industrial panel — not just clean, climate-controlled switchgear. ## Panel integration notes Depth of 76 mm (installation depth 70 mm) and width of 18 mm. The combined terminal top and bottom accept supply from either side. Sealable — a lockable cover can be fitted to prevent unauthorized operation. Halogen-free and silicon-free construction matters for environments with strict outgassing limits (clean rooms, medical, food processing).","metaTitle":"Siemens SENTRON 5SY4140-8 MCB, D-curve, 1P, 10kA/15kA, 400V","metaDescription":"Siemens SENTRON 5SY4140-8 miniature circuit breaker, D-curve, 1-pole, 10 kA (EN 60898) / 15 kA (IEC 60947-2) breaking capacity, 400 V AC. Active production. Quoted 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":"400 V","at DC rated value":"60 V","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","Combined Terminal Bottom":"Yes","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":"D","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 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$21.59","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=351861&mlfb=5SY4140-8","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SY4140-8/alternatives.json"},"ai":{"faq":[{"question":"What is the breaking capacity of the 5SY4140-8?","answer":"10 kA per EN 60898-1, 15 kA per IEC 60947-2 (AC), 15 kA per IEC 60947-2 (DC at 60 V), and 5 kA per UL 1077 / CSA C22.2 No.235."},{"question":"Will the 5SY4140-8 drop into a panel specified around the 5SY4140-7 without rewiring?","answer":"Yes — both are 1-pole, 18 mm wide MCBs with the same SENTRON footprint and quick-assembly DIN-rail mount. The 5SY4140-8 is a D-curve variant; the 5SY4140-7 is a C-curve. Swap without rewiring as long as the tripping characteristic matches the load."},{"question":"Where can I buy the 5SY4140-8 and get current pricing?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm price and lead time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY4140-8","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/5SY4140-8 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}}