{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SJ4240-8HG41","brand":"Siemens","brandSlug":"siemens","productSlug":"5SJ4240-8HG41","canonicalUrl":"https://aoctrl.com/siemens/5SJ4240-8HG41","factsUrl":"https://aoctrl.com/api/mcp/products/5SJ4240-8HG41","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SJ4 miniature circuit breaker, 2-pole, D tripping characteristic, 10 kA (EN 60898) / 15 kA (IEC 60947-2), 400 V AC / 60 V DC, 36 mm width, 70 mm depth, DIN-rail mount.","salesMarkdown":"The 5SJ4240-8HG41 is a 2-pole SENTRON miniature circuit breaker with a D tripping characteristic, meaning it tolerates the high inrush currents typical of motor, transformer, and welding loads without nuisance tripping — the magnetic trip fires at 10–20× rated current, not the 5–10× of a C-curve. On the 400 V AC side it breaks 10 kA per EN 60898 (the standard for household-type MCBs in final circuits) and 15 kA per IEC 60947-2 (the industrial standard for isolating and switching in control panels). At 60 V DC the breaking capacity drops — the datasheet lists the DC rated value at 60 V maximum, so this is not a primary DC breaker for battery banks or solar strings; it is an AC mains breaker that also handles low-voltage DC control circuits. Halogen-free and silicon-free construction, which matters in clean-room or semiconductor-adjacent installs where outgassing can contaminate optics or contacts. Vibration resistance rated at 50 m/s² over 25–150 Hz and 60 m/s² at 35 Hz — survives the typical machine-mounted enclosure shake. Sealable design allows the panel builder to lock the handle position with a padlock for lockout/tagout compliance.","metaTitle":"Siemens 5SJ4240-8HG41 SENTRON MCB, 2P D-curve, 10kA/15kA","metaDescription":"Siemens 5SJ4240-8HG41 SENTRON 2-pole miniature circuit breaker, D tripping characteristic, 10 kA per EN 60898, 15 kA per IEC 60947-2. 36 mm wide, 70 mm deep, DIN-rail mount. Active","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":"5SJ4240-8HG41","Height":"110 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Miniature circuit breaker 240 V 10kA, 2-pole, D, 40A, D=70 mm according to UL 489","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":"4.5 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$125.73","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/279333b77f4f6523ab609310a5951b97.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=205580&mlfb=5SJ4240-8HG41"},"ai":{"faq":[{"question":"What is the breaking capacity of the 5SJ4240-8HG41?","answer":"10 kA per EN 60898 and 15 kA per IEC 60947-2 at 400 V AC. The 15 kA rating governs fault coordination in industrial panel designs."},{"question":"What is the D-curve on this MCB for?","answer":"The D tripping characteristic (magnetic trip at 10–20× In) is sized for loads with high inrush — motors, transformers, welding equipment, and capacitive loads. It avoids nuisance trips that a C-curve would give on a motor start."},{"question":"Will the 5SJ4240-8HG41 drop into a panel specified around the 5SY4140-7?","answer":"Both are 2-pole DIN-rail MCBs of similar width, but the 5SY series uses a different tripping characteristic (B or C) and a different breaking capacity rating. The 5SJ4240-8HG41 has a D-curve and higher 15 kA IEC rating, so it is not a direct functional substitute without verifying the required trip curve and fault level for the circuit."},{"question":"Where can I buy the 5SJ4240-8HG41?","answer":"Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — no stock count or price is published here."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SJ4240-8HG41","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/5SJ4240-8HG41 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}}