{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SJ4218-8HG42","brand":"Siemens","brandSlug":"siemens","productSlug":"5SJ4218-8HG42","canonicalUrl":"https://aoctrl.com/siemens/5SJ4218-8HG42","factsUrl":"https://aoctrl.com/api/mcp/products/5SJ4218-8HG42","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SJ4 series, 2-pole miniature circuit breaker, D tripping characteristic, 15 A rated at AC, 60 V DC max, 36 mm wide, 70 mm depth.","salesMarkdown":"The 15 A rating holds at 30 °C and 40 °C ambient; above that it derates to 14.6 A at 45 °C, 14.1 A at 50 °C, 13.6 A at 55 °C, and 13.2 A at 60 °C, so factor your panel ambient into the load calculation. ## Panel fit and environment Width is 36 mm (2 modular units), depth 70 mm, height 121 mm. Snaps onto standard mounting rail (DIN rail) in any position. Sealable, so a panel lockout tag can be applied after commissioning.","metaTitle":"Siemens 5SJ4218-8HG42 SENTRON MCB, 2P D 15A","metaDescription":"Siemens 5SJ4218-8HG42 SENTRON miniature circuit breaker, 2-pole, D-curve, 15 A rated at AC, 60 V DC max. Active production. Quoted 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":"5SJ4218-8HG42","Height":"121 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Circuit breaker 10kA, 2-pole, D, 15 A according to UL 489-480Y/277V","Halogen-Free":"Yes","Silicon-Free":"Yes","Design Of Pole":"2P","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":"15 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":"15 A","at 40 °C / rated value":"15 A","at 45 °C / rated value":"14.6 A","at 50 °C / rated value":"14.1 A","at 55 °C / rated value":"13.6 A","at 60 °C / rated value":"13.2 A","Combined Terminal Bottom":"Yes","according to IEC 81346-2":"F","Suitability For Operation":"Mechanical engineering / industry","Neutral Conductor Switching":"No","Number Of Modular Width Units":"2","Tripping Characteristic Class":"D","at DC / rated value / maximum":"60 V","Position / Of Power Supply Cord":"Any","according to EN 60898 / rated value":"10 kA","supply voltage / at AC / rated value":"400 V","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)","Type Of Voltage / Of The Operating Voltage":"AC/DC","Value Range / Of The Supply Voltage Frequency":"50/60 Hz","insulation voltage (Ui) / at AC / rated value":"440 V","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 (Switching Cycles) / Typical":"10 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/50fdc8cf0bcf90c479dd24e7929e3ac3.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=481294&mlfb=5SJ4218-8HG42"},"ai":{"faq":[{"question":"How do I get current pricing and availability for 5SJ4218-8HG42?","answer":"Submit an RFQ. Pricing and stock are confirmed at quote time through independent distribution channels."},{"question":"What is the D tripping characteristic used for?","answer":"The D-curve (10–20× In magnetic trip) is designed for loads with high inrush current: motors, transformers, welding equipment, and discharge lighting. It prevents nuisance tripping on startup surges while still providing short-circuit protection."},{"question":"What is the thermal derating for 5SJ4218-8HG42?","answer":"The 15 A rating holds at 30 °C and 40 °C. It derates to 14.6 A at 45 °C, 14.1 A at 50 °C, 13.6 A at 55 °C, and 13.2 A at 60 °C. Factor your panel ambient temperature into the load calculation."},{"question":"What compliance documentation does this brand provide for 5SJ4218-8HG42?","answer":"The product is designated per EN 61346-2 and IEC 81346-2 (function code F). It is halogen-free and silicon-free, rated for pollution degree 3 and overvoltage category 3. Standard manufacturer declarations for RoHS and REACH are available on request."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SJ4218-8HG42","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/5SJ4218-8HG42 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}}