{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SJ4118-8HG42","brand":"Siemens","brandSlug":"siemens","productSlug":"5SJ4118-8HG42","canonicalUrl":"https://aoctrl.com/siemens/5SJ4118-8HG42","factsUrl":"https://aoctrl.com/api/mcp/products/5SJ4118-8HG42","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SJ4118-8HG42 miniature circuit breaker, 1-pole, 15 A at AC, 18 mm width, DIN-rail mount.","salesMarkdown":"It's built for overcurrent protection in control panels and distribution boards — the kind of line-side or branch-circuit protection you'd spec into a machine or a sub-panel. The 15 A rating holds at 30 °C and 40 °C ambient; derate slightly above that — 14.6 A at 45 °C, 14.1 A at 50 °C, 13.6 A at 55 °C, 13.2 A at 60 °C. If your panel runs warm, factor that in. Depth is 70 mm, installation depth the same — no extra clearance needed behind the rail. Height is 121 mm. That's a standard MCB footprint; it'll drop into any SENTRON or third-party distribution board that accepts 18 mm-wide modules. IP20 with conductors connected, IP40 in the handle area — fine for enclosed panels. If you're filling a BOM line or replacing a failed unit in a panel, the 5SJ4118-8HG42 is a direct drop-in for any 1-pole, 15 A MCB application using the same DIN-rail footprint. No rewiring or panel modification needed.","metaTitle":"Siemens 5SJ4118-8HG42 SENTRON MCB, 1P, 15 A, 18 mm","metaDescription":"Siemens 5SJ4118-8HG42 SENTRON miniature circuit breaker, 1-pole, 15 A at AC, DIN-rail mount, IP20/IP40, -40 to 75 °C. Active production, 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","Height":"121 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","Halogen-Free":"Yes","Silicon-Free":"Yes","Design Of Pole":"1P","Number Of Poles":"1","lifecycle_stage":"current","Fastening Method":"on standard mounting rail","Mounting Position":"any","at AC rated value":"15 A","Installation Depth":"70 mm","Product Brand Name":"SENTRON","Degree Of Pollution":"3","Product Designation":"Miniature circuit breakers","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","Product Function Note":"Terminal tightening torque for Cu, 60/75°C; 3.5Nm/31lb.in","at 30 °C rated value":"15 A","at 40 °C rated value":"15 A","at 45 °C rated value":"14.6 A","at 50 °C rated value":"14.1 A","at 55 °C rated value":"13.6 A","at 60 °C rated value":"13.2 A","Tunnel Terminals Bottom":"No","according to EN 61346-2":"F","Combined Terminal Bottom":"Yes","according to IEC 81346-2":"F","Suitability For Operation":"Mechanical engineering / industry","at DC rated value maximum":"60 V","Neutral Conductor Switching":"No","Number Of Modular Width Units":"1","Position Of Power Supply Cord":"Any","Tripping Characteristic Class":"D","supply voltage at AC rated value":"400 V","according to EN 60898 rated value":"10 kA","Ambient Temperature During Operation":"max. 95% humidity","Supply Voltage Frequency Rated Value":"50 Hz","according to IEC 60947-2 rated value":"15 kA","installation environment regarding EMC":"Suitable for environment B (immunity to interference not applicable)","Type Of Voltage Of The Operating Voltage":"AC/DC","insulation voltage (Ui) at AC rated value":"440 V","Value Range Of The Supply Voltage Frequency":"50/60 Hz","vibration resistance according to IEC 60068-2-6":"±1 mm at 5 to 25 Hz; 50 m/s² at 25 to 150 Hz","Mechanical Service Life (Operating Cycles) Typical":"10 000","Product Extension Installable Supplementary Devices":"Yes","Tightening Torque With Screw-Type Terminals Maximum":"3.5 N·m","power loss [W] for rated value of the current at AC in hot operating state per pole":"1.8 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$34.29 – $96.79","priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/74ebbc8525f553eeda84d95a8cbc9aef.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=24483&mlfb=5SJ4118-8HG42","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SJ4118-8HG42/alternatives.json"},"ai":{"faq":[{"question":"What are the key dimensions — depth and width?","answer":"Depth is 70 mm (installation depth also 70 mm), width is 18 mm (one modular unit), height is 121 mm. Fits standard DIN-rail enclosures and distribution boards."},{"question":"What compliance documentation is available?","answer":"The part is halogen-free and silicon-free, and carries IP20/IP40 protection. The SENTRON brand typically provides CE, UL, and CSA certifications per the series. For specific documentation (RoHS, REACH, UL file number), request the manufacturer's declaration from your Siemens distributor — it's not listed in this spec summary."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SJ4118-8HG42","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/5SJ4118-8HG42 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}}