{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SJ6120-7KS","brand":"Siemens","brandSlug":"siemens","productSlug":"5SJ6120-7KS","canonicalUrl":"https://aoctrl.com/siemens/5SJ6120-7KS","factsUrl":"https://aoctrl.com/api/mcp/products/5SJ6120-7KS","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SJ6 series, miniature circuit breaker, 1-pole, C-curve, 20 A, 6 kA breaking capacity, 230/400 V AC, screwless outgoing terminals.","salesMarkdown":"The Siemens 5SJ6120-7KS is a 1-pole SENTRON miniature circuit breaker from the 5SJ6 series, rated 20 A with a C-curve trip characteristic. Breaking capacity is 6 kA per both EN 60898 and IEC 60947-2, which covers the majority of residential and light commercial panelboards where the prospective fault current stays under that threshold. The C-curve (5–10× In) handles motor inrush and transformer energization without nuisance tripping, while still clearing low-impedance faults fast enough to limit let-through energy to Class 3. ## DC rating and application scope Rated for DC circuits up to 60 V maximum — covers control-voltage supplies, signal loops, and small DC bus feeds in industrial panels. AC rating is 400 V line-to-line, 230 V phase-to-neutral. The part is designated for residential buildings and infrastructure per the manufacturer's suitability listing; it also fits commercial sub-distribution and light industrial branch circuits where the SCCR requirement does not exceed 6 kA.","metaTitle":"Siemens 5SJ6120-7KS SENTRON MCB, 1P C-curve 20 A, 6 kA","metaDescription":"Siemens 5SJ6120-7KS SENTRON miniature circuit breaker, 1-pole, C-curve, 20 A rated, 6 kA breaking capacity per EN 60898. Active production. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["1-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Width":"18 mm","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","Halogen-Free":"Yes","Silicon-Free":"Yes","Number Of Poles":"1","Type Of Voltage":"AC/DC","lifecycle_stage":"current","Mounting Position":"any","Installation Depth":"70 mm","Product Brand Name":"SENTRON","Degree Of Pollution":"2","Product Designation":"Miniature circuit breaker","acc. to IEC 81346-2":"F","at AC / rated value":"20 A","protection class IP":"IP20, with connected conductors","Overvoltage Category":"3","Design Of The Product":"Miniature circuit breaker 5SJ6","Number Of Poles / Note":"1P","acc. to DIN EN 61346-2":"F","Energy Limitation Class":"3","Suitability For Operation":"Residential buildings/infrastructure","Number Of Modular Width Units":"1","Tripping Characteristic Class":"C","at DC / rated value / maximum":"60 V","acc. to EN 60898 / rated value":"6 kA","acc. to IEC 60947-2 / rated value":"6 kA","Product Feature / Touch Protection":"Yes","supply voltage / at AC / rated value":"400 V","Influence Of The Surrounding Temperature":"Periodically +55°C, max. 95% humidity","insulation voltage / at AC / rated value":"440 V","with multi-phase operation / at AC / maximum":"440 V","Product Function / Neutral Conductor Switching":"No","Mechanical Service Life (Operating Cycles) / Typical":"20 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/d051ab0a00caa03b042d915f7611ba80.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=98925&mlfb=5SJ6120-7KS","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SJ6120-7KS/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 5SJ6120-7KS?","answer":"Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."},{"question":"What is the breaking capacity of 5SJ6120-7KS?","answer":"6 kA per EN 60898 and IEC 60947-2, at 230/400 V AC."},{"question":"What is the width of 5SJ6120-7KS?","answer":"18 mm, which is one modular width unit on standard DIN rail."},{"question":"What is the depth of 5SJ6120-7KS?","answer":"76 mm overall depth; installation depth is 70 mm."},{"question":"Does 5SJ6120-7KS have screwless terminals?","answer":"Yes, the outgoing terminals are screwless (spring-cage type) per the manufacturer description."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SJ6120-7KS","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/5SJ6120-7KS 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}}