{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SJ4205-7HG42","brand":"Siemens","brandSlug":"siemens","productSlug":"5SJ4205-7HG42","canonicalUrl":"https://aoctrl.com/siemens/5SJ4205-7HG42","factsUrl":"https://aoctrl.com/api/mcp/products/5SJ4205-7HG42","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SJ4 series, 2-pole miniature circuit breaker, C-curve, 0.5 A rated at AC, DIN rail mount, IP20/IP40.","salesMarkdown":"## C-curve trip and 0.5 A rating The Siemens 5SJ4205-7HG42 is a 2-pole miniature circuit breaker from the SENTRON 5SJ4 series, with a C-curve trip characteristic and a rated current of 0.5 A at AC. At DC, the maximum rated voltage is 60 V, so it can serve DC control circuits or small solar combiner boxes within that limit. The breaker accepts both AC and DC voltage types, giving flexibility across mixed-supply panels. The 36 mm width corresponds to 2 modular units (each 18 mm), so it occupies two slots in a distribution board. Protection class is IP20 with connected conductors, and IP40 in the handle range — adequate for enclosed distribution panels where the front handle is exposed but terminals are behind a cover. ## Thermal derating and ambient range Rated 0.5 A at 30 °C, 40 °C, and 45 °C, then derates to 0.48 A at 45 °C, 0.46 A at 50 °C, 0.44 A at 55 °C, and 0.42 A at 60 °C.","metaTitle":"Siemens 5SJ4205-7HG42 2-Pole MCB, C-Curve 0.5 A","metaDescription":"Siemens 5SJ4205-7HG42 SENTRON 2-pole MCB, C-curve, 0.5 A rated at AC. DIN rail mount, IP20/IP40. Current lifecycle stage. Sourced to order against RFQ.","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":"5SJ4205-7HG42","Height":"121 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Circuit breaker 10kA, 2-pole, C, 0.5 A according to UL 489-480Y/277V","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":"0.5 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":"0.5 A","at 40 °C / rated value":"0.5 A","at 45 °C / rated value":"0.48 A","at 50 °C / rated value":"0.46 A","at 55 °C / rated value":"0.44 A","at 60 °C / rated value":"0.42 A","Combined Terminal Bottom":"Yes","Suitability For Operation":"Mechanical engineering / industry","Number Of Modular Width Units":"2","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":"$225.51","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/3e7674068864074ac5d50cf33330efb7.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=187701&mlfb=5SJ4205-7HG42"},"ai":{"faq":[{"question":"Where can I buy Siemens 5SJ4205-7HG42?","answer":"The Siemens 5SJ4205-7HG42 is available to order against an RFQ through independent distribution. Submit a request with your target quantity and delivery timeline for a current quote and lead time confirmation."},{"question":"What is the interrupting rating of Siemens 5SJ4205-7HG42?","answer":"The interrupting rating is not explicitly listed in the available specifications. The breaker carries a C-curve trip characteristic (5–10× In) and is rated for AC/DC operation up to 60 V DC. Confirm the specific interrupting capacity with the datasheet or your Siemens representative for coordination studies."},{"question":"Is Siemens 5SJ4205-7HG42 UL listed?","answer":"The available specifications do not include a UL listing mark. The breaker is designed to IEC standards (IEC 81346-2, DIN EN 61346-2) and carries IP20/IP40 protection. For UL 489 compliance, verify the specific certification on the product label or consult Siemens documentation."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SJ4205-7HG42","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/5SJ4205-7HG42 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}}