{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SL4120-8","brand":"Siemens","brandSlug":"siemens","productSlug":"5SL4120-8","canonicalUrl":"https://aoctrl.com/siemens/5SL4120-8","factsUrl":"https://aoctrl.com/api/mcp/products/5SL4120-8","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SL4120-8, 1-pole miniature circuit breaker, D tripping characteristic, 20 A rated at 30 °C, 10 kA breaking capacity per EN 60898 / IEC 60947-2, 1 MWU width.","salesMarkdown":"It's rated 20 A at 30 °C ambient, and its breaking capacity is 10 kA under both EN 60898 and IEC 60947-2 — that means it can safely interrupt fault currents up to 10,000 A without welding or exploding, which is the standard for most residential and light-commercial distribution boards. At 40 °C the continuous rating derates to 18.48 A, at 45 °C to 17.6 A, and at 55 °C to 15.92 A, so if the panel runs hot, size up accordingly. This is a 1-module-width (18 mm) unit, 90 mm tall, 76 mm deep (70 mm installation depth), so it fits standard DIN-rail enclosures without crowding adjacent poles. Rated for AC only, single-phase up to 250 V or multi-phase up to 440 V. ## Panel integration and compliance notes Sealable (can be locked in the OFF position for lockout/tagout). Halogen-free and silicon-free — important for clean-room or sensitive-environment panels where outgassing can contaminate contacts or optics. Touch protection is built in, so no additional finger-safe shrouds needed on the line side. Energy limitation class 3, which means it limits let-through energy well — good for downstream component protection.","metaTitle":"Siemens 5SL4120-8 SENTRON MCB, 1P D 20A 10kA, 1MWU","metaDescription":"Siemens 5SL4120-8 SENTRON miniature circuit breaker, 1-pole, D-curve, 20A rated at 30°C, 10kA breaking capacity per EN 60898/IEC 60947-2. Active production, sourced to order. Reque","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","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":"III","Number Of Poles / Note":"1P","acc. to DIN EN 61346-2":"F","Energy Limitation Class":"3","at 30 °C / rated value":"20 A","at 40 °C / rated value":"18.48 A","at 45 °C / rated value":"17.6 A","at 55 °C / rated value":"15.92 A","Suitability For Operation":"Residential buildings/infrastructure","Number Of Modular Width Units":"1","Tripping Characteristic Class":"D","at DC / rated value / maximum":"72 V","acc. to EN 60898 / rated value":"10 kA","acc. to IEC 60947-2 / rated value":"10 kA","Product Feature / Touch Protection":"Yes","supply voltage / at AC / rated value":"400 V","Influence Of The Surrounding Temperature":"+55 °C, max. 95% humidity","with multi-phase operation / at AC / maximum":"440 V","Product Function / Neutral Conductor Switching":"No","with multi-phase operation / at AC / rated value":"440 V","with single-phase operation / at AC / rated value":"250 V","Mechanical Service Life (Operating Cycles) / Typical":"10 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/969d2a03ff948cc8b48940093bb94601.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=514114&mlfb=5SL4120-8","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SL4120-8/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy the 5SL4120-8 and get a price?","answer":"The 5SL4120-8 is sourced to order through independent distribution. Submit an RFQ; availability and current pricing are confirmed at quote time."},{"question":"What is the 5SL4120-8's depth and width?","answer":"Depth is 76 mm (70 mm installation depth), width is 18 mm (1 modular width unit), height is 90 mm."},{"question":"What compliance documentation does Siemens provide for the 5SL4120-8?","answer":"The 5SL4120-8 carries IEC/EN 60898 and IEC 60947-2 ratings (10 kA breaking capacity). It is halogen-free and silicon-free. The product designation follows IEC 81346-2 and DIN EN 61346-2 (function code F). Specific RoHS/REACH/UL declarations should be requested with the RFQ."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SL4120-8","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/5SL4120-8 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}}