{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY7104-8","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY7104-8","canonicalUrl":"https://aoctrl.com/siemens/5SY7104-8","factsUrl":"https://aoctrl.com/api/mcp/products/5SY7104-8","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY7104-8 miniature circuit breaker, 1-pole, 4 A rated, D tripping characteristic, 15 kA breaking capacity per EN 60898, 40 kA per IEC 60947-2.","salesMarkdown":"## Temperature derating and real-world current The 4 A rating holds at 35 °C ambient. At 40 °C it derates to 3.76 A, at 50 °C to 3.5 A, and at 60 °C to 3.22 A. That derating curve matters when sizing for a motor branch that pulls 3.8 A at full load; you'd need to step up one frame size or improve ventilation. The 5SY7104-8 is dual-rated: it meets IEC/EN 60898-1 for residential/commercial MCB duty and IEC/EN 60947-2 plus UL 1077 for industrial supplemental protection. That dual listing means it can serve in a UL 508A panel as a branch-circuit protective device (supplemental) or in a European-spec distribution board.","metaTitle":"Siemens 5SY7104-8 SENTRON MCB, 4A D-Curve, 1-Pole, 15kA","metaDescription":"Siemens 5SY7104-8 SENTRON miniature circuit breaker, 4A rated, D tripping characteristic, 1-pole, 15kA breaking capacity per EN 60898. Current 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":"4 A","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","at 35 °C rated value":"4 A","at 40 °C rated value":"3.76 A","at 45 °C rated value":"3.63 A","at 50 °C rated value":"3.5 A","at 55 °C rated value":"3.36 A","at 60 °C rated value":"3.22 A","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":"15 kA","according to IEC 60947-2 rated value":"40 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":"1.2 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$19.05","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=221169&mlfb=5SY7104-8","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SY7104-8/alternatives.json"},"ai":{"faq":[{"question":"What is the breaking capacity of 5SY7104-8?","answer":"15 kA per EN 60898 and 40 kA per IEC 60947-2. At DC per IEC 60947-2 it is rated 15 kA."},{"question":"What is the D-curve on this MCB for?","answer":"D-curve trips between 10x and 20x rated current, designed for loads with high inrush like motors, transformers, and welding equipment."},{"question":"Where can I buy 5SY7104-8?","answer":"Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing confirmed at quote time."},{"question":"Will 5SY7104-8 drop into a panel specified for 5SY4140-7?","answer":"Both are 1-pole SENTRON MCBs in 18 mm width, same DIN-rail footprint. The key difference is the tripping characteristic: 5SY7104-8 is D-curve (high inrush), while 5SY4140-7 is B-curve (general-purpose). They are mechanically interchangeable but electrically different — verify the branch-circuit requirement before swapping."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY7104-8","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/5SY7104-8 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}}