{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SJ4105-7HG42","brand":"Siemens","brandSlug":"siemens","productSlug":"5SJ4105-7HG42","canonicalUrl":"https://aoctrl.com/siemens/5SJ4105-7HG42","factsUrl":"https://aoctrl.com/api/mcp/products/5SJ4105-7HG42","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SJ4 series, 5SJ4105-7HG42, 1-pole miniature circuit breaker, C-curve, 0.5 A rated current, 18 mm width, DIN-rail mount.","salesMarkdown":"The Siemens SENTRON 5SJ4105-7HG42 is a 1-pole miniature circuit breaker with a C-curve tripping characteristic, rated at 0.5 A at 30 °C. It is designed for standard DIN-rail mounting and occupies one modular width unit (18 mm). The C-curve means it trips between 5 and 10 times rated current, making it suitable for protecting circuits with moderate inrush — typical for control transformers, contactor coils, and general industrial loads in mechanical engineering and industry applications. ## Ratings and fit Rated 0.5 A at both 30 °C and 40 °C ambient, it derates to 0.48 A at 45 °C, 0.46 A at 50 °C, 0.44 A at 55 °C, and 0.42 A at 60 °C. If the panel ambient runs above 40 °C, the load must be reduced accordingly or the breaker may nuisance-trip. The 18 mm width (1 MW) and 70 mm installation depth let it drop into any standard modular enclosure. It snaps onto a standard mounting rail in any orientation and accepts combined terminals top and bottom for daisy-chaining busbars or ring-tongue lugs. Rated for AC/DC operation, with a maximum DC voltage of 60 V. The IP20 rating applies with connected conductors; the handle area is rated IP40, which keeps dust out of the toggle mechanism in industrial cabinets. Overvoltage category 3 and pollution degree 3 mean it is rated for fixed installations within building distribution panels and industrial control panels where transient overvoltages and conductive dust are expected. ## Lifecycle and sourcing The 5SJ4105-7HG42 is halogen-free and silicon-free, which matters for applications sensitive to outgassing — such as sealed relay cabinets or medical-adjacent environments where corrosion of silver contacts is a concern.","metaTitle":"Siemens 5SJ4105-7HG42 SENTRON MCB, 1P C-curve 0.5 A","metaDescription":"Siemens SENTRON 5SJ4105-7HG42 miniature circuit breaker, 1-pole, C-curve, 0.5 A rated at 30°C. Active production. DIN-rail mount, 18 mm wide. Sourced 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":"5SJ4105-7HG42","Height":"121 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Circuit breaker 10kA, 1-pole, C, 0.5 A according to UL 489-277V","Halogen-Free":"Yes","Silicon-Free":"Yes","Number Of Poles":"1","Type Of Voltage":"AC/DC","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":"0.5 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","Number Of Poles / Note":"1P","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":"0.5 A","at 40 °C / rated value":"0.5 A","at 45 °C / rated value":"0.48 A","at 50 °C / rated value":"0.46 A","at 55 °C / rated value":"0.44 A","at 60 °C / rated value":"0.42 A","Combined Terminal Bottom":"Yes","Suitability For Operation":"Mechanical engineering / industry","Number Of Modular Width Units":"1","Tripping Characteristic Class":"C","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)","Influence Of The Surrounding Temperature":"max. 95% humidity","insulation voltage / at AC / rated value":"440 V","Product Function / Neutral Conductor Switching":"No","Mechanical Service Life (Operating Cycles) / Typical":"10 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$35.56 – $99.95","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/ae3630c4f2daeb156d4e282e97cab0fe.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=80929&mlfb=5SJ4105-7HG42"},"ai":{"faq":[{"question":"What are the key ratings for this MCB?","answer":"1-pole, C-curve, 0.5 A rated at 30 °C and 40 °C. Maximum DC voltage is 60 V. It derates at higher ambients: 0.48 A at 45 °C, 0.46 A at 50 °C, 0.44 A at 55 °C, 0.42 A at 60 °C. It occupies 18 mm on a DIN rail."},{"question":"Will the 5SJ4105-7HG42 fit a panel designed for a 5SL4363-7?","answer":"Both are 1-pole DIN-rail miniature circuit breakers from the Siemens SENTRON family, so the physical footprint (18 mm width, 70 mm depth) and mounting are identical. The difference is the tripping curve and rating — the 5SJ4105-7HG42 is a C-curve 0.5 A, while the 5SL4363-7 is a different characteristic and current. No rewiring is needed for the physical swap, but the protection settings must match the circuit requirements."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SJ4105-7HG42","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/5SJ4105-7HG42 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}}