{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SJ4208-8HG42","brand":"Siemens","brandSlug":"siemens","productSlug":"5SJ4208-8HG42","canonicalUrl":"https://aoctrl.com/siemens/5SJ4208-8HG42","factsUrl":"https://aoctrl.com/api/mcp/products/5SJ4208-8HG42","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SJ4 series, 2-pole miniature circuit breaker, D tripping characteristic, 10 kA (EN 60898) / 15 kA (IEC 60947-2), 400 V AC / 60 V DC, 2 MW units, DIN rail mount.","salesMarkdown":"## What this 2-pole D-curve MCB is for The Siemens 5SJ4208-8HG42 is a 2-pole miniature circuit breaker from the SENTRON 5SJ4 series, sized at 2 modular width units (36 mm) for standard DIN-rail enclosures. Rated 10 kA breaking capacity per EN 60898 and 15 kA per IEC 60947-2 at 400 V AC, with a 60 V DC rating for control-circuit protection. The 440 V insulation voltage (Ui) and overvoltage category 3 with pollution degree 3 mean it's rated for fixed-installation panels in industrial environments — not just residential distribution boards. Sealable, halogen-free, silicon-free construction — relevant for clean-room or corrosive-gas environments where outgassing matters. Vibration resistance tested to 50 m/s² at 25–150 Hz and 60 m/s² at 35 Hz (4 s), so it holds up on machine-mounted subpanels near rotating equipment. Listed as current-production lifecycle stage — no phase-out notice on this order code. The 5SJ4 series remains an active Siemens SENTRON line, so BOM freeze risk is low for new builds.","metaTitle":"Siemens 5SJ4208-8HG42 SENTRON MCB, 2P D-Curve, 10 kA","metaDescription":"Siemens 5SJ4208-8HG42 SENTRON 2-pole MCB, D tripping characteristic, 10 kA (EN 60898) / 15 kA (IEC 60947-2). 400 V AC, 60 V DC. DIN rail mount. Active production. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["2-Pole MCB (DIN Rail)"],"specifications":{"Depth":"70 mm","Width":"36 mm","title":"5SJ4208-8HG42","Height":"121 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Circuit breaker 10kA, 2-pole, D, 8A according to UL 489-480Y/277V","Halogen-Free":"Yes","Silicon-Free":"Yes","Design Of Pole":"2P","Number Of Poles":"2","lifecycle_stage":"current","Fastening Method":"on standard mounting rail","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 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","Tunnel Terminals Bottom":"No","Combined Terminal Bottom":"Yes","Suitability For Operation":"Mechanical engineering / industry","at DC rated value maximum":"60 V","Neutral Conductor Switching":"No","Number Of Modular Width Units":"2","Position Of Power Supply Cord":"Any","Tripping Characteristic Class":"D","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)","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":"2.6 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$105.41","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/262361526376b0b27891ba36a64d50f9.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=237480&mlfb=5SJ4208-8HG42"},"ai":{"faq":[{"question":"Will 5SJ4208-8HG42 fit a panel designed for 5SY7206-7CC?","answer":"Both are 2-pole MCBs on 36 mm (2 MW) DIN-rail footprint, so the mechanical fit is the same. The difference is in breaking capacity and characteristic — 5SJ4208-8HG42 is a D-curve rated 10/15 kA; the 5SY7206-7CC is a different series with its own ratings. Check the coordination study before swapping."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SJ4208-8HG42","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/5SJ4208-8HG42 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}}