{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SJ4203-8HG42","brand":"Siemens","brandSlug":"siemens","productSlug":"5SJ4203-8HG42","canonicalUrl":"https://aoctrl.com/siemens/5SJ4203-8HG42","factsUrl":"https://aoctrl.com/api/mcp/products/5SJ4203-8HG42","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SJ4203-8HG42, 2-pole miniature circuit breaker, D-curve, 10 kA interrupting capacity per EN 60898, 15 kA per IEC 60947-2, 2 modular width units.","salesMarkdown":"## 2-pole D-curve MCB for motor and transformer circuits Rated 400 V AC and 60 V DC, it covers both power-distribution and DC control-circuit applications. The 2-pole configuration switches both phase conductors simultaneously — no neutral switching, so it fits line-to-line loads or two-pole branch circuits. ## Interrupting capacity and selectivity headroom The higher IEC rating gives selectivity headroom downstream of a larger upstream device — useful when coordinating with a 25 kA or 36 kA main breaker in a sub-distribution board. For DC circuits, the 60 V DC rating is the maximum voltage the arc chamber can extinguish — confirm the system voltage stays within that ceiling. Depth 70 mm, height 121 mm. The combined terminal design at both top and bottom accepts both cable and busbar insertion without swapping parts. Terminal torque spec is 3.5 Nm — a torque screwdriver is expected for the 60/75 °C rated conductors. The handle area carries IP40, so accidental splash through a panel cutout is contained. The halogen-free and silicon-free construction meets clean-room and railway rolling-stock material restrictions. The sealable design allows the panel builder to lock the handle position after commissioning — useful for tamper-proofing in shared-access enclosures.","metaTitle":"Siemens 5SJ4203-8HG42 2-Pole MCB, D-Curve, 10 kA EN 60898","metaDescription":"Siemens SENTRON 5SJ4203-8HG42 2-pole miniature circuit breaker, D-curve, 10 kA per EN 60898 / 15 kA per IEC 60947-2. Active production, sourced 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":"5SJ4203-8HG42","Height":"121 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Circuit breaker 10kA, 2-pole, D, 3 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":"1.8 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$105.41 – $253.91","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/d1d643310003415393478b116b15dbd5.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=229536&mlfb=5SJ4203-8HG42"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SJ4203-8HG42","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/5SJ4203-8HG42 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}}