{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SJ6120-6","brand":"Siemens","brandSlug":"siemens","productSlug":"5SJ6120-6","canonicalUrl":"https://aoctrl.com/siemens/5SJ6120-6","factsUrl":"https://aoctrl.com/api/mcp/products/5SJ6120-6","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SJ6 series, miniature circuit breaker, 1-pole, B characteristic, 20 A rated current, 6 kA breaking capacity per EN 60898, width 18 mm (1 MW).","salesMarkdown":"## 20 A B-curve MCB for branch-circuit protection The Siemens 5SJ6120-6 is a 1-pole miniature circuit breaker from the SENTRON 5SJ6 series, rated 20 A with a B tripping characteristic and a 6 kA breaking capacity per EN 60898 and IEC 60947-2. The 6 kA interrupting rating means it can safely clear a fault up to that level on a 240 V AC or 60 V DC circuit; at 440 V AC (multi-phase operation) the maximum voltage is higher, but the SCCR stays at 6 kA. Overvoltage category 3, pollution degree 2 (implied by IP20). The design is halogen-free and silicon-free, and the breaker is sealable for tamper-evident installations. Vibration resistance per IEC 60068-2-6: 50 m/s² at 25–150 Hz and 60 m/s² at 10–150 Hz. Mechanical service life is 20 000 switching cycles typical.","metaTitle":"Siemens 5SJ6120-6 SENTRON MCB, 1-pole B 20A 6kA","metaDescription":"Siemens 5SJ6120-6 SENTRON miniature circuit breaker, 1-pole, B-curve, 20 A, 6 kA per EN 60898. Current lifecycle. Quoted to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["1-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Solid":"0.75 ... 25 mm²","Width":"18 mm","Height":"90 mm","Sealable":"Yes","Stranded":"0.75 ... 25 mm²","Rated Value":"50 Hz","Halogen-Free":"Yes","Silicon-Free":"Yes","During Storage":"-40 ... +75 °C","Number of poles":"1","Type of voltage":"AC/DC","lifecycle_stage":"current","Mounting position":"any","Installation depth":"70 mm","Product brand name":"SENTRON","Ambient temperature":"-20 ... +45 °C","Product designation":"Miniature circuit breakers","Protection class IP":"IP20, with connected conductors","Overvoltage category":"3","Design of the product":"Miniature circuit breaker 5SJ6","Energy limiting class":"3","Number of width units":"1","Number of poles / Note":"1","acc. to DIN EN 61346-2":"F","acc. to DIN EN 81346-2":"F","circuit-breaker / Design":"5SJ6","Current / at AC / rated value":"20 A","Tripping characteristic class":"B","at DC / rated value / maximum":"60 V","acc. to EN 60898 / rated value":"6 kA","Position / of power supply cord":"Any","acc. to IEC 60947-2 / rated value":"6 kA","Product feature / Touch protection":"Yes","Supply voltage / at AC / rated value":"240 V","Influence of the surrounding temperature":"Periodically +55°C, max. 95% humidity","Insulation voltage / at AC / rated value":"440 V","Vibration resistance / acc. to IEC 60068-2-6":"50m/s² at 25 to 150Hz and 60m/s² at 10 to 150 Hz","with multi-phase operation / at AC / maximum":"440 V","Mechanical service life (switching cycles) / typical":"20 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=6191&mlfb=5SJ6120-6","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SJ6120-6/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional second-source to 5SJ6120-6?","answer":"The 5SJ6220-6 is the same 1-pole, 20 A, B-curve MCB but with a 10 kA breaking capacity instead of 6 kA. It shares the same 18 mm width, terminal range, and mounting footprint, so it drops into the same panel position without rewiring — just verify the higher SCCR is acceptable for the fault level at the installation point."},{"question":"What compliance documentation does Siemens provide for 5SJ6120-6?","answer":"The breaker is rated per EN 60898 and IEC 60947-2, carries overvoltage category 3, and is halogen-free and silicon-free. Standard Siemens documentation includes a CE declaration and the product is designed for 50 Hz networks."},{"question":"Where can I buy 5SJ6120-6 and how is it quoted?","answer":"The 5SJ6120-6 is sourced to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for your volume and delivery requirements."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SJ6120-6","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/5SJ6120-6 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}}