{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SJ4104-8HG42","brand":"Siemens","brandSlug":"siemens","productSlug":"5SJ4104-8HG42","canonicalUrl":"https://aoctrl.com/siemens/5SJ4104-8HG42","factsUrl":"https://aoctrl.com/api/mcp/products/5SJ4104-8HG42","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SJ4 miniature circuit breaker, 1-pole, D characteristic, 10 kA (EN 60898) / 15 kA (IEC 60947-2), 18 mm width, 70 mm depth.","salesMarkdown":"## What this MCB is and where it fits The Siemens 5SJ4104-8HG42 is a SENTRON miniature circuit breaker with a D tripping characteristic, designed for one-pole protection in 50 Hz systems. It snaps onto a standard mounting rail and occupies one modular width unit (18 mm), making it a direct fit for any DIN-rail panel that expects a single-pole MCB. The D-curve means it tolerates high inrush currents — typical for motor starters, transformers, or lighting ballasts — without nuisance tripping on startup. ## Key ratings and what they mean for your panel Rated breaking capacity is 10 kA per EN 60898 and 15 kA per IEC 60947-2 at 400 V AC. The higher IEC figure applies when the MCB is used as a distribution breaker in industrial panels; the EN figure covers residential or commercial final circuits. Either way, it clears faults up to those levels without welding contacts or cascading upstream. Insulation voltage (Ui) is 440 V AC, so it's comfortable on 400 V line-to-line systems. DC rating maxes at 60 V — useful for control-circuit protection but not for high-voltage DC bus work. Pollution degree 3 and overvoltage category 3 mean the breaker is rated for industrial environments where conductive dust or condensation may occur — typical for factory-floor panels, not just clean switchboards. IP20 with connected conductors (IP40 in the handle area) is standard for enclosed distribution boards; the sealable feature (padlockable handle) allows lockout/tagout without an external accessory. ## Mounting and wiring details Depth is 70 mm, height 121 mm, width 18 mm. Halogen-free and silicon-free construction.","metaTitle":"Siemens 5SJ4104-8HG42 SENTRON MCB, D-curve, 1-pole, 10 kA","metaDescription":"Siemens 5SJ4104-8HG42 SENTRON miniature circuit breaker, D tripping characteristic, 1-pole, 10 kA per EN 60898, 15 kA per IEC 60947-2, 18 mm wide, current lifecycle stage. Sourced","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","title":"5SJ4104-8HG42","Height":"121 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Circuit breaker 10kA, 1-pole, D, 4 A according to UL 489-277V","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":"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":"1","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","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":"$38.10 – $102.39","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/358e710ad4d59ae174bf46bf09f2e378.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=245139&mlfb=5SJ4104-8HG42"},"ai":{"faq":[{"question":"Does this MCB fit a standard DIN-rail panel?","answer":"Yes, it fastens onto a standard mounting rail and occupies one modular width unit (18 mm). Mounting position is any, so it fits vertical or horizontal rails."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SJ4104-8HG42","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/5SJ4104-8HG42 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}}