{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY4103-5","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY4103-5","canonicalUrl":"https://aoctrl.com/siemens/5SY4103-5","factsUrl":"https://aoctrl.com/api/mcp/products/5SY4103-5","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY4103-5 miniature circuit breaker, 1-pole, characteristic A, 10 kA (IEC 60898-1) / 35 kA (IEC 60947-2), 400 V AC, 18 mm width, IP20.","salesMarkdown":"## Siemens 5SY4103-5 SENTRON MCB — 1-Pole, Characteristic A, High Breaking Capacity The Siemens 5SY4103-5 is a 1-pole miniature circuit breaker from the SENTRON family, with a tripping characteristic of class A — the most sensitive standard curve, tripping at 2–3× rated current within 0.1 s. This makes it the correct choice for protecting semiconductor loads, control transformers, or long cable runs where standard B-curve breakers would allow too much energy through before tripping. Breaking capacity is rated at 10 kA per IEC 60898-1 and 35 kA per IEC 60947-2 at 400 V AC, with a DC rating of 15 kA at 60 V per IEC 60947-2 and 5 kA per UL 1077. The 35 kA IEC 60947-2 rating means this breaker can be used in high-fault-current industrial panels where standard 10 kA MCBs would need upstream current-limiting fuses or a larger frame. Rated operational voltage is 400 V AC single-phase, with a maximum of 440 V AC in single- or multi-phase operation. DC rated voltage is 60 V, maximum 72 V. Frequency range is 50/60 Hz. ## Form Factor and Installation The quick-assembly fastening system allows snap-on mounting in any position. Height is 90 mm. Combined terminals at both top and bottom simplify busbar and ring-tongue wiring. Neutral conductor switching is not provided — this is a 1-pole breaker for line-only protection. ## Environmental and Derating However, the breaker must be derated for humidity: maximum 95% relative humidity at 55 °C, 55% at 70 °C, and 35% at 75 °C. Vibration resistance per IEC 60068-2-6: ±1 mm at 5 to 25 Hz, 50 m/s² at 25 to 150 Hz. Halogen-free and silicon-free construction — important for environments where outgassing can contaminate sensitive contacts or optics (e.g., clean rooms, medical device manufacturing). Designed and tested to IEC / EN 60898-1 (domestic and similar installations) and IEC / EN 60947-2 (industrial applications) / UL 1077 (supplementary protectors for North America). The dual rating means it can serve as a branch-circuit protective device in IEC panels and as a supplementary protector in UL panels — a distinction that matters when specifying for export or multi-standard facilities. Suitability for operation in mechanical engineering and industry per the manufacturer's designation. This is not a residential-grade MCB — it is built for the vibration, temperature swings, and fault-current levels found on factory floors.","metaTitle":"Siemens 5SY4103-5 SENTRON MCB, 1P, Characteristic A, 10kA IE","metaDescription":"Siemens 5SY4103-5 SENTRON miniature circuit breaker, 1-pole, 10 kA per IEC 60898-1, 35 kA per IEC 60947-2. Current-production part sourced to order. Request quote for pricing and a","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":"5SY4103-5","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, A, 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":"A","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":"1.9 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$30.48 – $72.01","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/aaa5fd44b47735b77dc1bb4079fc8d9f.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=485648&mlfb=5SY4103-5"},"ai":{"faq":[{"question":"How do I get current pricing and availability for 5SY4103-5?","answer":"Submit an RFQ for the Siemens 5SY4103-5. We confirm current pricing and availability at quote time through our independent distribution network. No stock or price figures are published here — they change daily and are confirmed per order."},{"question":"What is the breaking capacity of 5SY4103-5 at 400 V AC?","answer":"The 5SY4103-5 is rated 10 kA per IEC 60898-1 and 35 kA per IEC 60947-2 at 400 V AC. The 35 kA rating under the industrial standard is the one that matters for high-fault panels — it means this single-pole breaker can interrupt fault currents up to 35 kA without catastrophic failure, which is well above typical residential/commercial ratings."},{"question":"What does tripping characteristic A mean on the 5SY4103-5?","answer":"Characteristic A (Class A) trips at 2–3× rated current within 0.1 seconds. This is the most sensitive standard MCB curve, designed to protect semiconductor circuits, control transformers, and long cable runs where even a brief overcurrent can damage sensitive electronics. Standard B-curve breakers (3–5×) would allow more fault energy through before tripping."},{"question":"What compliance documentation does Siemens provide for 5SY4103-5?","answer":"The 5SY4103-5 is certified to IEC / EN 60898-1, IEC / EN 60947-2, and UL 1077. It is halogen-free and silicon-free. Siemens provides the standard declaration of conformity and the relevant test certificates with the product. For specific documentation requests (RoHS, REACH, UL file number), include them in your RFQ."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY4103-5","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/5SY4103-5 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}}