{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SJ4305-8HG42","brand":"Siemens","brandSlug":"siemens","productSlug":"5SJ4305-8HG42","canonicalUrl":"https://aoctrl.com/siemens/5SJ4305-8HG42","factsUrl":"https://aoctrl.com/api/mcp/products/5SJ4305-8HG42","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SJ4305-8HG42 miniature circuit breaker, 3-pole, D tripping characteristic, 10 kA (EN 60898) / 15 kA (IEC 60947-2), 3 modular width units, IP20/IP40 handle.","salesMarkdown":"## D-curve tripping for high-inrush loads The 5SJ4305-8HG42: The D characteristic means this 5SJ4 breaker tolerates the 10–20× rated-current inrush typical of motor starters, small transformers, and solenoid banks without nuisance tripping — it's the standard choice for industrial control panels where inductive loads share the branch. Rated 10 kA per EN 60898 and 15 kA per IEC 60947-2, so it handles the higher prospective fault current in an industrial distribution board — the 15 kA figure applies when the breaker is installed per the IEC standard's industrial rules, giving you a safety margin over the 10 kA domestic rating. ## DIN-rail footprint and panel fit Three modular width units wide on a standard mounting rail — that's 54 mm on the DIN rail, with a 70 mm depth that clears most shallow enclosures when wired with combined terminals top and bottom. Mounts in any position and carries IP20 on the body with IP40 in the handle area — the toggle is shielded from accidental contact in open panels, but the terminals still need finger-safe covers if the busbar is exposed. ## Sourcing and lifecycle The 5SJ4 series is the standard industrial MCB line — not a specialty or phase-out family. For panel builders locking in a BOM, this means the part is a stable line item without imminent obsolescence risk.","metaTitle":"Siemens 5SJ4305-8HG42 SENTRON MCB, D-curve, 3-pole","metaDescription":"Siemens 5SJ4305-8HG42 SENTRON miniature circuit breaker. D tripping characteristic, 3-pole, rated 10 kA (EN 60898) / 15 kA (IEC 60947-2).","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["3-Pole MCB (DIN Rail)"],"specifications":{"Depth":"70 mm","Width":"54 mm","title":"5SJ4305-8HG42","Height":"121 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Circuit breaker 10kA, 3-pole, D, 0.5 A according to UL 489-480Y/277V","Halogen-Free":"Yes","Silicon-Free":"Yes","Design Of Pole":"3P","Number Of Poles":"3","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":"3","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":"1.2 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$323.53","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/c7a3b0321bf9e8024a53034faa7dfc45.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=342870&mlfb=5SJ4305-8HG42"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SJ4305-8HG42","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/5SJ4305-8HG42 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}}