{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SJ4245-8HG41","brand":"Siemens","brandSlug":"siemens","productSlug":"5SJ4245-8HG41","canonicalUrl":"https://aoctrl.com/siemens/5SJ4245-8HG41","factsUrl":"https://aoctrl.com/api/mcp/products/5SJ4245-8HG41","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SJ4 series, miniature circuit breaker, 2-pole, 45 A rated at 40 °C, D tripping characteristic, 70 mm depth, 36 mm width, DIN rail mount.","salesMarkdown":"The Siemens SENTRON 5SJ4245-8HG41 is a 2-pole miniature circuit breaker in the 5SJ4 family, rated 45 A at both 30 °C and 40 °C ambient with a D tripping characteristic. That D-curve means it tolerates the high inrush of motor and transformer loads — magnetic trip kicks in between 10x and 20x rated current, so it won't nuisance-trip on a pump or compressor start. Rated for AC/DC operation, with a maximum DC voltage of 60 V. At 45 °C it drops to 44.1 A, at 50 °C to 43.2 A, at 55 °C to 42.2 A, and at 60 °C to 41.4 A. If your enclosure runs hot, check the thermal curve: a 50 °C panel knocks off about 1.8 A. Vibration resistance is rated at 50 m/s² from 25 to 150 Hz and 60 m/s² at 35 Hz — enough for machine-mounted applications near conveyors or compressors.","metaTitle":"Siemens SENTRON 5SJ4245-8HG41 MCB, 2-pole, 45 A, D-curve","metaDescription":"Siemens SENTRON 5SJ4245-8HG41 miniature circuit breaker, 2-pole, 45 A rated at 40 °C, D tripping characteristic, 70 mm depth, DIN rail mount. Current 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","Height":"110 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","Halogen-Free":"Yes","Silicon-Free":"Yes","Number Of Poles":"2","Type Of Voltage":"AC/DC","lifecycle_stage":"current","Fastening Method":"on standard mounting rail","Mounting Position":"any","Installation Depth":"70 mm","Product Brand Name":"SENTRON","Degree Of Pollution":"3","Product Designation":"Miniature circuit breakers","acc. to IEC 81346-2":"F","at AC / rated value":"45 A","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","Number Of Poles / Note":"2P","acc. to DIN EN 61346-2":"F","Product Function / Note":"Terminal tightening torque for Cu, 60/75°C; 3.5Nm/31lb.in","Tunnel Terminals Bottom":"No","at 30 °C / rated value":"45 A","at 40 °C / rated value":"45 A","at 45 °C / rated value":"44.1 A","at 50 °C / rated value":"43.2 A","at 55 °C / rated value":"42.2 A","at 60 °C / rated value":"41.4 A","Combined Terminal Bottom":"Yes","Suitability For Operation":"Mechanical engineering / industry","Number Of Modular Width Units":"2","Tripping Characteristic Class":"D","at DC / rated value / maximum":"60 V","acc. to EN 60898 / rated value":"10 kA","Position / Of Power Supply Cord":"Any","acc. to IEC 60947-2 / rated value":"15 kA","Product Feature / Touch Protection":"Yes","supply voltage / at AC / rated value":"400 V","installation environment regarding EMC":"Suitable for environment B (immunity to interference not applicable)","Influence Of The Surrounding Temperature":"max. 95% humidity","insulation voltage / at AC / rated value":"440 V","Product Function / Neutral Conductor Switching":"No","Mechanical Service Life (Operating Cycles) / Typical":"10 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/e03001193a0bc9101e7e08ac22095808.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=396670&mlfb=5SJ4245-8HG41","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SJ4245-8HG41/alternatives.json"},"ai":{"faq":[{"question":"What are the key ratings for this MCB?","answer":"2-pole, 45 A rated at 40 °C, D tripping characteristic, AC/DC rated with 60 V DC max, DIN rail mount, IP20/IP40 protection."},{"question":"Where can I buy the 5SJ4245-8HG41 and how is it quoted?","answer":"Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SJ4245-8HG41","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/5SJ4245-8HG41 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-09-02T08:15:54.622Z","lastPublished":"2026-09-02T08:15:54.622Z","indexable":true}}