{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SJ4103-8HG40","brand":"Siemens","brandSlug":"siemens","productSlug":"5SJ4103-8HG40","canonicalUrl":"https://aoctrl.com/siemens/5SJ4103-8HG40","factsUrl":"https://aoctrl.com/api/mcp/products/5SJ4103-8HG40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SJ4 miniature circuit breaker, 1-pole, D tripping characteristic, 3 A rated current, 10 kA breaking capacity per EN 60898, 18 mm width, IP20/IP40.","salesMarkdown":"## What this MCB is and where it fits The Siemens 5SJ4103-8HG40 is a 1-pole miniature circuit breaker from the SENTRON 5SJ4 series, rated 3 A with a D tripping characteristic and a 10 kA breaking capacity per EN 60898. It snaps onto standard DIN rail and occupies one modular width unit (18 mm). The D curve means it tolerates high inrush currents — typically motor or transformer loads — without nuisance tripping on startup. ## Ratings that govern the real-world fit At 30 °C and 40 °C ambient the breaker holds a full 3 A continuous; derate to 2.9 A at 45 °C, 2.8 A at 50 °C, 2.7 A at 55 °C, and 2.6 A at 60 °C. If the panel runs hot — say a sealed enclosure near a motor — use the 55 °C or 60 °C row to size the load. The 10 kA breaking capacity per EN 60898 covers most commercial and light industrial fault levels; for higher SCCR environments you'd step to an industrial-class MCB or fuse. ## Mounting and environment notes Mounts on standard DIN rail in any position. Installation depth matches the body depth at 70 mm. The enclosure rating is IP20 with connected conductors, IP40 in the handle area — fine for a dry indoor panel; not for washdown or outdoor exposure. Halogen-free and silicon-free construction matters if the panel serves sensitive electronics or clean-room zones.","metaTitle":"Siemens 5SJ4103-8HG40 SENTRON MCB, 1P D 3A, 10kA","metaDescription":"Siemens 5SJ4103-8HG40 SENTRON miniature circuit breaker, 1-pole, D-curve, 3 A, 10 kA per EN 60898. 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":"70 mm","Width":"18 mm","title":"5SJ4103-8HG40","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Miniature circuit breaker 240 V 14kA, 1-pole, D, 3 A, D=70 mm according to UL 489, equal polarity","Halogen-Free":"Yes","Silicon-Free":"Yes","Number Of Poles":"1","lifecycle_stage":"current","Fastening Method":"on standard mounting rail","Mounting Position":"any","Installation Depth":"70 mm","Product Brand Name":"SENTRON","Degree Of Pollution":"3","Product Designation":"Miniature circuit breakers","acc. to IEC 81346-2":"F","at AC / rated value":"3 A","protection class IP":"IP20, with connected conductors, IP 40 in the handle range","Overvoltage Category":"3","Tunnel Terminals Top":"No","Vibration Resistance":"50 m/s² at 25 to 150Hz and 60m/s² at 35Hz (4sec)","Combined Terminal Top":"Yes","Design Of The Product":"Miniature circuit-breaker 5SJ4","acc. to DIN EN 61346-2":"F","Product Function / Note":"Terminal tightening torque for Cu, 60/75°C; 3.5Nm/31lb.in","Tunnel Terminals Bottom":"No","at 30 °C / rated value":"3 A","at 40 °C / rated value":"3 A","at 45 °C / rated value":"2.9 A","at 50 °C / rated value":"2.8 A","at 55 °C / rated value":"2.7 A","at 60 °C / rated value":"2.6 A","Combined Terminal Bottom":"Yes","Suitability For Operation":"Mechanical engineering / industry","Number Of Modular Width Units":"1","Tripping Characteristic Class":"D","at DC / rated value / maximum":"60 V","acc. to EN 60898 / rated value":"10 kA","Position / Of Power Supply Cord":"Any","acc. to IEC 60947-2 / rated value":"15 kA","Product Feature / Touch Protection":"Yes","supply voltage / at AC / rated value":"400 V","installation environment regarding EMC":"Suitable for environment B (immunity to interference not applicable)","insulation voltage (Ui) / at AC / rated value":"440 V","Product Component / Neutral Conductor Switching":"No","Mechanical Service Life (Switching Cycles) / Typical":"10 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$78.01","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/d13bbdc891a7a0a1645b802bdba628a6.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=428425&mlfb=5SJ4103-8HG40"},"ai":{"faq":[{"question":"What is the breaking capacity of 5SJ4103-8HG40?","answer":"10 kA per EN 60898 at the rated voltage. That covers most commercial and light industrial fault levels."},{"question":"Where can I buy 5SJ4103-8HG40?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."},{"question":"What is the D tripping characteristic used for?","answer":"The D curve tolerates high inrush currents — typically motor or transformer loads — without nuisance tripping on startup."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SJ4103-8HG40","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/5SJ4103-8HG40 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}}