{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SL6420-6","brand":"Siemens","brandSlug":"siemens","productSlug":"5SL6420-6","canonicalUrl":"https://aoctrl.com/siemens/5SL6420-6","factsUrl":"https://aoctrl.com/api/mcp/products/5SL6420-6","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SL6420-6 miniature circuit breaker, 4-pole, B-curve, 20 A, 6 kA at 400 V AC, 4 MW width.","salesMarkdown":"The Siemens 5SL6420-6 is a 4-pole SENTRON miniature circuit breaker with a B tripping characteristic, rated 20 A at 400 V AC and a breaking capacity of 6 kA per EN 60898 and IEC 60947-2. B-curve means the magnetic trip activates between 3 and 5 times rated current (60–100 A for this 20 A unit), making it a good fit for resistive and general-purpose loads in residential and infrastructure panels — not for motor starting where inrush would nuisance-trip it. For higher fault-current environments (industrial mains), a higher-rated 5SL6 variant would be needed. ## Temperature derating — the real-world current limit At 30 °C ambient the 5SL6420-6 carries its full 20 A. At 40 °C it derates to 18.79 A, at 45 °C to 18.6 A, and at 55 °C to 16.8 A. If the panel runs hot — say 45 °C inside the enclosure — the circuit must be loaded to no more than 18.6 A continuous, not the nameplate 20 A. The 72 mm width (4 MW) is standard for a 4-pole MCB in this class; it occupies four adjacent 18 mm slots. Sealable design means the factory or installer can apply a wire seal to the toggle to prevent unauthorized operation after commissioning — useful for landlord-tenant submeters or critical infrastructure panels.","metaTitle":"Siemens 5SL6420-6 SENTRON MCB, 4P B 20A 6kA 400V","metaDescription":"Siemens 5SL6420-6 SENTRON miniature circuit breaker, 4-pole, B-curve, 20A, 6kA at 400V AC. Active production. Quoted to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Miniature Circuit Breakers (MCB)"],"specifications":{"Depth":"76 mm","Width":"72 mm","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","Halogen-Free":"Yes","Silicon-Free":"Yes","Design Of Pole":"4P","Number Of Poles":"4","lifecycle_stage":"current","Mounting Position":"any","Installation Depth":"70 mm","Product Brand Name":"SENTRON","Degree Of Pollution":"2","Product Designation":"Miniature circuit breaker","at AC / rated value":"20 A","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","Energy Limitation Class":"3","according to EN 61346-2":"F","at 30 °C / rated value":"20 A","at 40 °C / rated value":"18.79 A","at 45 °C / rated value":"18.6 A","at 55 °C / rated value":"16.8 A","according to IEC 81346-2":"F","Suitability For Operation":"Residential buildings/infrastructure","Number Of Modular Width Units":"4","Tripping Characteristic Class":"B","at DC / rated value / maximum":"72 V","according to EN 60898 / rated value":"6 kA","supply voltage / at AC / rated value":"400 V","according to IEC 60947-2 / rated value":"6 kA","Type Of Voltage / Of The Operating Voltage":"AC","with multi-phase operation / at AC / maximum":"440 V","Value Range / Of The Supply Voltage Frequency":"50/60 Hz","with multi-phase operation / at AC / rated value":"440 V","Mechanical Service Life (Switching Cycles) / Typical":"10 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/f89338303db62cb8c7aaf733803ebb7d.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=343159&mlfb=5SL6420-6","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SL6420-6/alternatives.json"},"ai":{"faq":[{"question":"What is the breaking capacity of 5SL6420-6?","answer":"6 kA at 400 V AC per EN 60898 and IEC 60947-2. This is the standard domestic/light-commercial breaking capacity; for industrial panels with higher fault current, a higher-rated 5SL6 variant is required."},{"question":"Where can I buy 5SL6420-6 and get current pricing?","answer":"Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm quote."},{"question":"What compliance documentation is available for 5SL6420-6?","answer":"The product carries IEC 60947-2 and EN 60898 ratings. It is halogen-free and silicon-free. Standard Siemens SENTRON documentation (datasheet, CE declaration, RoHS/REACH statements) is available on request."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SL6420-6","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/5SL6420-6 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}}