{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SL4120-7","brand":"Siemens","brandSlug":"siemens","productSlug":"5SL4120-7","canonicalUrl":"https://aoctrl.com/siemens/5SL4120-7","factsUrl":"https://aoctrl.com/api/mcp/products/5SL4120-7","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON miniature circuit breaker, 1-pole, C-curve, 20 A rated, 10 kA breaking capacity per EN 60898, 18 mm width, 76 mm depth.","salesMarkdown":"## Siemens 5SL4120-7 SENTRON MCB — 20 A, C-curve, 10 kA The Siemens 5SL4120-7 is a 1-pole SENTRON miniature circuit breaker with a C-curve trip characteristic, rated 20 A at 30 °C and 400 V AC. The C-curve (5–10× In) is the default for general-purpose loads: lighting, socket outlets, small appliances, and control transformers where inrush isn't extreme. At 40 °C ambient the continuous rating derates to 18.48 A, so a panel running warm needs to account for that gap if the circuit is loaded near the nameplate. ## Integration notes Sealable design (padlockable toggle) and touch protection on the terminals meet the requirements for lockout/tagout procedures and finger-safe wiring per IEC 61439. The 10 000 mechanical switching cycles typical service life is adequate for a distribution breaker that sees infrequent manual operation; it is not rated for frequent switching duty like a contactor.","metaTitle":"Siemens 5SL4120-7 SENTRON MCB, 1P C-curve 20 A 10 kA","metaDescription":"Siemens 5SL4120-7 SENTRON miniature circuit breaker, 1-pole C-curve 20 A, 10 kA breaking capacity per EN 60898, 18 mm wide. Current lifecycle stage, sourced to order. Request a quo","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","Design Of Pole":"1P","Number Of Poles":"1","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":"18.48 A","at 45 °C / rated value":"17.6 A","at 55 °C / rated value":"15.92 A","according to IEC 81346-2":"F","Suitability For Operation":"Residential buildings/infrastructure","Number Of Modular Width Units":"1","Tripping Characteristic Class":"C","at DC / rated value / maximum":"72 V","Product Feature / Touch Protection":"Yes","according to EN 60898 / rated value":"10 kA","supply voltage / at AC / rated value":"400 V","according to IEC 60947-2 / rated value":"10 kA","Type Of Voltage / Of The Operating Voltage":"AC","with multi-phase operation / at AC / maximum":"440 V","Product Component / 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 (Switching 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=99921&mlfb=5SL4120-7","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SL4120-7/alternatives.json"},"ai":{"faq":[{"question":"What is the breaking capacity of the 5SL4120-7?","answer":"The 5SL4120-7 is rated 10 kA breaking capacity per EN 60898 and also 10 kA per IEC 60947-2, covering most residential and light commercial fault-current scenarios."},{"question":"Will the 5SL4120-7 fit in a panel designed for the 5SL4120-7CC?","answer":"Yes, the 5SL4120-7 shares the same 18 mm width, 1-pole C-curve, and 10 kA breaking capacity as the 5SL4120-7CC. The body and termination points are identical; the difference is in the accessory interface for auxiliary contacts."},{"question":"How do I get pricing and availability for the 5SL4120-7?","answer":"The 5SL4120-7 is sourced and quoted to order against an RFQ through independent distribution. Current pricing and availability are confirmed at quote time — submit a request for a firm quote."},{"question":"What compliance documentation does Siemens provide for the 5SL4120-7?","answer":"The 5SL4120-7 carries ratings per EN 60898 and IEC 60947-2, and its halogen-free, silicon-free construction supports RoHS/REACH compliance documentation from Siemens."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SL4120-7","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/5SL4120-7 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}}