{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SJ4145-7HG40","brand":"Siemens","brandSlug":"siemens","productSlug":"5SJ4145-7HG40","canonicalUrl":"https://aoctrl.com/siemens/5SJ4145-7HG40","factsUrl":"https://aoctrl.com/api/mcp/products/5SJ4145-7HG40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SJ4 series, miniature circuit breaker 5SJ4145-7HG40, 1-pole, C-curve, 45 A at AC, 70 mm depth, 18 mm width, current production.","salesMarkdown":"The Siemens 5SJ4145-7HG40 is a SENTRON miniature circuit breaker (MCB), 1-pole, C-curve, rated 45 A at AC (also 45 A at 40 °C ambient). It is the standard panel-protection building block for branch circuits in industrial control cabinets — mechanical engineering and industry applications per the listing. Rated 45 A at 30 °C and 40 °C, derated to 43.7 A at 45 °C, 42.8 A at 50 °C, 41.7 A at 55 °C, and 41 A at 60 °C. Maximum DC voltage is 60 V, so it's fine for 48 VDC control circuits but not for a 125 VDC battery bank. Overvoltage category 3 and pollution degree 3 mean it's rated for the fixed-installation environment inside an industrial enclosure. Width is 18 mm (one modular unit), depth 70 mm, height 90 mm. Terminals are combined (top and bottom) — not tunnel type — so you land a ring or fork lug. Terminal tightening torque is 3.5 Nm for copper conductors rated 60/75 °C. Sealable, halogen-free, silicon-free. IP20 with connected conductors, IP40 in the handle area.","metaTitle":"Siemens 5SJ4145-7HG40 SENTRON MCB, 1P C 45A","metaDescription":"Siemens SENTRON 5SJ4145-7HG40 miniature circuit breaker, 1-pole, C-curve, 45 A rated at 40 °C, 70 mm depth, current production. Sourced to order against RFQ.","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":"5SJ4145-7HG40","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Miniature circuit breaker 240 V 10kA, 1-pole, C, 45 A, D=70 mm according to UL 489, equal polarity","Halogen-Free":"Yes","Silicon-Free":"Yes","Number Of Poles":"1","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":"1P","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":"43.7 A","at 50 °C / rated value":"42.8 A","at 55 °C / rated value":"41.7 A","at 60 °C / rated value":"41 A","Combined Terminal Bottom":"Yes","Suitability For Operation":"Mechanical engineering / industry","Number Of Modular Width Units":"1","Tripping Characteristic Class":"C","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":"$41.91","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/5835b579e48452d951a95517beacf35b.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=396276&mlfb=5SJ4145-7HG40"},"ai":{"faq":[{"question":"What are the key ratings of the 5SJ4145-7HG40?","answer":"1-pole, C-curve, rated 45 A at AC (45 A at 40 °C), max DC 60 V, width 18 mm, depth 70 mm, operating temperature -40 to 75 °C."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SJ4145-7HG40","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/5SJ4145-7HG40 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}}