{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SJ4208-7HG42","brand":"Siemens","brandSlug":"siemens","productSlug":"5SJ4208-7HG42","canonicalUrl":"https://aoctrl.com/siemens/5SJ4208-7HG42","factsUrl":"https://aoctrl.com/api/mcp/products/5SJ4208-7HG42","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SJ4 series, miniature circuit breaker, 2-pole, C-curve, 8 A AC rated, 36 mm wide, DIN-rail mount.","salesMarkdown":"The Siemens 5SJ4208-7HG42 is a 2-pole miniature circuit breaker from the SENTRON 5SJ4 series, with a C-curve tripping characteristic and an 8 A rated current at 30 °C. Rated 8 A at 30 °C, but the thermal derating curve is published: at 40 °C it still holds 8 A, at 45 °C it drops to 7.8 A, at 50 °C to 7.6 A, at 55 °C to 7.4 A, and at 60 °C to 7.2 A. The DC side is rated 60 V maximum, so it can switch DC control circuits up to that voltage, but not higher. IP20 with connected conductors, IP40 in the handle area — fine for enclosed distribution boards where the front face is accessible but the terminals are behind a cover.","metaTitle":"Siemens 5SJ4208-7HG42 SENTRON MCB, 2-Pole C-Curve 8A, 36mm","metaDescription":"Siemens 5SJ4208-7HG42 SENTRON miniature circuit breaker, 2-pole, C-curve, 8 A rated at 30 °C. DIN-rail mount, IP20/IP40. Current production. Available 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","title":"5SJ4208-7HG42","Height":"121 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Circuit breaker 10kA, 2-pole, C, 8A according to UL 489-480Y/277V","Halogen-Free":"Yes","Silicon-Free":"Yes","Number Of Poles":"2","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","at AC / rated value":"8 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","Product Function / Note":"Terminal tightening torque for Cu, 60/75°C; 3.5Nm/31lb.in","Tunnel Terminals Bottom":"No","according to EN 61346-2":"F","at 30 °C / rated value":"8 A","at 40 °C / rated value":"8 A","at 45 °C / rated value":"7.8 A","at 50 °C / rated value":"7.6 A","at 55 °C / rated value":"7.4 A","at 60 °C / rated value":"7.2 A","Combined Terminal Bottom":"Yes","according to IEC 81346-2":"F","Suitability For Operation":"Mechanical engineering / industry","Number Of Modular Width Units":"2","Tripping Characteristic Class":"C","at DC / rated value / maximum":"60 V","Position / Of Power Supply Cord":"Any","Product Feature / Touch Protection":"Yes","according to EN 60898 / rated value":"10 kA","supply voltage / at AC / rated value":"400 V","according to IEC 60947-2 / rated value":"15 kA","installation environment regarding EMC":"Suitable for environment B (immunity to interference not applicable)","Type Of Voltage / Of The Operating Voltage":"AC/DC","insulation voltage (Ui) / at AC / rated value":"440 V","Product Component / Neutral Conductor Switching":"No","Mechanical Service Life (Switching Cycles) / Typical":"10 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/e77f3e234302a8d8b6c3c37f62f7a74f.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=160122&mlfb=5SJ4208-7HG42"},"ai":{"faq":[{"question":"What is the rated current of 5SJ4208-7HG42?","answer":"Rated 8 A at 30 °C AC, with published derating: 8 A at 40 °C, 7.8 A at 45 °C, 7.6 A at 50 °C, 7.4 A at 55 °C, and 7.2 A at 60 °C."},{"question":"What is the width of 5SJ4208-7HG42?","answer":"36 mm wide, which is 2 modular width units on standard DIN rail."},{"question":"What is the depth of 5SJ4208-7HG42?","answer":"70 mm deep, with an installation depth also listed as 70 mm."},{"question":"Where can I buy 5SJ4208-7HG42?","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":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SJ4208-7HG42","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/5SJ4208-7HG42 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}}