{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RA2120-4ND27-0AP0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RA2120-4ND27-0AP0","canonicalUrl":"https://aoctrl.com/siemens/3RA2120-4ND27-0AP0","factsUrl":"https://aoctrl.com/api/mcp/products/3RA2120-4ND27-0AP0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RA2120-4ND27-0AP0 direct online motor starter, size S0, 28 A AC-3 at 400 V, Class 10, for 60 mm busbar systems, screw terminals.","salesMarkdown":"## Active production, direct-on-line starter for 60 mm busbars The 3RA2120-4ND27-0AP0: The unit ships with a 3RT2027-1AP00 contactor and a 3RA2921-1AA00 link module, both pre-assembled and wired for the main circuit. Main circuit connections use screw-type terminals. ## AC-3 ratings and mounting constraints At 480 V and 600 V, the starter is rated 27 A in AC-3 duty — the slight derating from the 28 A at 400 V reflects the higher voltage stress on the contactor. Maximum operating voltage is 690 V AC-3. Mounting position is vertical only, with 50 mm clearance required above and 20 mm forward. Side clearance is 20 mm; no clearance needed behind the unit. This is a tight-fit design for dense busbar layouts. Dimensions are 155 mm deep by 45 mm wide by 260 mm high — the narrow width allows multiple starters side-by-side on a 60 mm busbar system without exceeding the panel width budget. The supplied contactor (3RT2027-1AP00) and link module (3RA2921-1AA00) are also active and widely available.","metaTitle":"Siemens 3RA2120-4ND27-0AP0 SIRIUS Direct Starter, 28 A AC-3","metaDescription":"Siemens SIRIUS 3RA2120-4ND27-0AP0 direct online starter, 28 A at 400 V AC-3, Class 10, for 60 mm busbars. Active production, quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Motor Starters"],"specifications":{"Depth":"155 mm","Width":"45 mm","Height":"260 mm","Trip Class":"CLASS 10","Product Status":"Active","Temp Operating Max":"60 °C","Temp Operating Min":"-20 °C"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/08683359f4bb41440a0de16a77e9698d.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=127311&mlfb=3RA2120-4ND27-0AP0"},"ai":{"faq":[{"question":"What is the AC-3 current rating of this starter?","answer":"The maximum operating voltage in AC-3 duty is 690 V."},{"question":"What components are included with the 3RA2120-4ND27-0AP0?","answer":"It ships with a 3RT2027-1AP00 contactor and a 3RA2921-1AA00 link module, pre-assembled as a direct-on-line starter."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RA2120-4ND27-0AP0","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/3RA2120-4ND27-0AP0 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-22T19:47:38.189Z","lastPublished":"2026-07-22T19:47:38.189Z","indexable":true}}