{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SJ4204-8HG42","brand":"Siemens","brandSlug":"siemens","productSlug":"5SJ4204-8HG42","canonicalUrl":"https://aoctrl.com/siemens/5SJ4204-8HG42","factsUrl":"https://aoctrl.com/api/mcp/products/5SJ4204-8HG42","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SJ4 series, 2-pole miniature circuit breaker, 4 A rated, D tripping characteristic, 10 kA (EN 60898) / 15 kA (IEC 60947-2) interrupting capacity, 400 VAC / 60 VDC, DIN rail mount.","salesMarkdown":"## Interrupting capacity and tripping curve — the two numbers that decide the BOM fit The 5SJ4204-8HG42 carries a 10 kA interrupting rating per EN 60898 and a 15 kA rating per IEC 60947-2 — the higher figure applies when the breaker is part of an industrial panel where the prospective fault current at the bus can exceed 10 kA. The D-curve characteristic (10–20× In magnetic trip) means it tolerates the inrush of motor loads, solenoid banks, or transformers without nuisance tripping on start-up, while still clearing a bolted fault in under 10 ms. Rated 4 A at 400 VAC (50 Hz) and 60 VDC, the 2-pole design switches both line conductors simultaneously — no neutral switching. The 400 VAC rating covers line-to-line loads in three-phase panels; the 60 VDC rating limits it to low-voltage DC control circuits, not string-level solar or battery banks. Depth is 70 mm including the handle overhang; the body is 121 mm tall. Combined (screw + cage) terminals top and bottom accept Cu conductors at 3.5 Nm tightening torque. The breaker is sealable, halogen-free, and silicon-free, which matters in clean-room or coated-board environments where outgassing can cause relay contact failure. Pollution degree 3, overvoltage category III, and IP20 (IP40 in the handle area) mean it is rated for the conductive-dust and condensation environment typical of industrial enclosures. The 5SJ4 series is the SENTRON miniature circuit-breaker family for mechanical engineering and industry applications.","metaTitle":"Siemens 5SJ4204-8HG42 SENTRON 2-Pole MCB, 4A D Curve, 10 kA","metaDescription":"Siemens 5SJ4204-8HG42 2-pole MCB, 4 A, D tripping characteristic. 10 kA (EN 60898) / 15 kA (IEC 60947-2) interrupting capacity. 400 VAC / 60 VDC.","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":"5SJ4204-8HG42","Height":"121 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Circuit breaker 10kA, 2-pole, D, 4 A 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":"1.6 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$105.41 – $236.88","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/268dae762e6e9859204aae4ed3583ad4.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=322406&mlfb=5SJ4204-8HG42"},"ai":{"faq":[{"question":"Can I replace a failed 5SJ4204-8HG42 with any 2-pole 4A D curve breaker?","answer":"Only if the substitute matches the 10 kA / 15 kA interrupting capacity at 400 VAC and the 60 VDC rating, and fits 2 MW DIN rail footprint. The SENTRON 5SJ4 is a standard-profile breaker — many panel builders spec it for the sealable terminal cover and the halogen-free housing. A parametric match is possible, but the physical interlock with the busbar system and the sealability are not universal."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SJ4204-8HG42","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/5SJ4204-8HG42 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}}