{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY4103-8","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY4103-8","canonicalUrl":"https://aoctrl.com/siemens/5SY4103-8","factsUrl":"https://aoctrl.com/api/mcp/products/5SY4103-8","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY4103-8, 1-pole miniature circuit breaker, D tripping characteristic, 10 kA per EN 60898, 35 kA per IEC 60947-2, 400 V AC, 1 MW width.","salesMarkdown":"That D-curve means it's built for loads with high inrush — motor starters, transformers, welding equipment — where the magnetic trip holds off until roughly 10–20× rated current before instantaneously opening. It's a standard DIN-rail unit, 18 mm wide (1 modular width), and mounts in any position. ## Breaking capacity and standards — what the ratings mean This breaker carries three breaking-capacity ratings depending on the standard applied. For UL 1077 and CSA C22.2 No. 235 the rating is 5 kA at 400 V AC — relevant if the panel is destined for North American markets. On DC circuits (up to 72 V) it's rated 15 kA per IEC 60947-2. The D-curve's magnetic trip threshold is higher than B or C curves, so it won't nuisance-trip on the inrush of a 3-phase motor or a bank of discharge lamps. Vibration resistance per IEC 60068-2-6 covers typical industrial panel conditions.","metaTitle":"Siemens 5SY4103-8 SENTRON MCB, 1P D-curve, 10 kA, 400 V AC","metaDescription":"Siemens 5SY4103-8 SENTRON miniature circuit breaker, 1-pole, D tripping characteristic, 10 kA (EN 60898), 35 kA (IEC 60947-2), 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","title":"5SY4103-8","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","Standard":"IEC / EN 60898-1, IEC / EN 60947-2 / UL1077","description":"Miniature circuit breaker 230/400 V 10kA, 1-pole, D, 3 A, D=70 mm","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":"35 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":"$30.48 – $69.48","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/bfcfd5024a17056fb7a00d14aac6f673.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=134623&mlfb=5SY4103-8"},"ai":{"faq":[{"question":"Who supplies 5SY4103-8 and how is it quoted for volume purchases?","answer":"The 5SY4103-8 is sourced through independent distribution and quoted to order against an RFQ. Availability and current pricing are confirmed at quote time; no stock or price figures are published here."},{"question":"Will 5SY4103-8 drop into a panel that was specified around 5SY4140-7 without rewiring?","answer":"Both are 1-pole SENTRON MCBs on the same 18 mm DIN-rail footprint, so the mechanical fit is identical. The difference is the tripping characteristic: 5SY4103-8 is a D-curve (high inrush), while 5SY4140-7 is a different curve. If the panel's load type matches the D-curve, it's a direct swap; if the original design called for a B or C curve, the D-curve may not provide adequate protection for low-inrush circuits."},{"question":"What compliance documentation does this brand provide for 5SY4103-8?","answer":"The breaker is certified to IEC / EN 60898-1, IEC / EN 60947-2, and UL 1077 / CSA C22.2 No. 235. It is halogen-free and silicon-free. The manufacturer provides a declaration of conformity and test reports covering these standards; RoHS and REACH compliance documentation is available on request."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY4103-8","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/5SY4103-8 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}}