{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RA2120-4EA27-0AP0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RA2120-4EA27-0AP0","canonicalUrl":"https://aoctrl.com/siemens/3RA2120-4EA27-0AP0","factsUrl":"https://aoctrl.com/api/mcp/products/3RA2120-4EA27-0AP0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RA2120-4EA27-0AP0 direct on-line motor starter, S0 size, 29 A AC-3 at 400 V, 15 kW rated power, Class 10 thermal bimetallic overload, screw terminals, 45 x 97 x 193 mm.","salesMarkdown":"## Panel fit and wiring constraints The 3RA2120-4EA27-0AP0: The S0 footprint is 45 mm wide, 97 mm deep, and 193 mm tall — the 45 mm width is the DIN-rail pitch, so it occupies one standard 45 mm module position on the rail. Clearance requirements around the unit: 50 mm upwards, 20 mm forwards, 20 mm at the sides, 10 mm downwards, and 0 mm backwards — the zero backward clearance means it can sit flush against a back panel or busbar support without derating. Main circuit wiring uses screw-type terminals — the supplied contactor is 3RT2027-1AP00 and the link module is 3RA2921-1AA00, so the starter arrives as a single assembly ready for line and load connections.","metaTitle":"Siemens 3RA2120-4EA27-0AP0 SIRIUS Motor Starter, 29 A AC-3","metaDescription":"Siemens 3RA2120-4EA27-0AP0 SIRIUS direct on-line starter, S0 size, 29 A AC-3 at 400 V, 15 kW rated power, Class 10 thermal overload, screw terminals, current","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Motor Starters"],"specifications":{"Depth":"97 mm","Width":"45 mm","title":"3RA2120-4EA27-0AP0","Height":"193 mm","Upwards":"50 mm","Forwards":"20 mm","Backwards":"0 mm","Downwards":"10 mm","Trip Class":"CLASS 10","At The Side":"20 mm","Rated Value":"690 V","description":"Load feeder fuseless, Direct-on-line starting 400 V AC, Size S0 27.0...32.0 A 230 V AC screw terminal for installation on standard mounting rail (also fulfills type of coordination 1) Type of coordination 2, Iq = 150 kA 1 NO+1 NC (contactor)","During Storage":"-50 ... +80 °C","lifecycle_stage":"current","During Operation":"-20 ... +60 °C","During Transport":"-50 ... +80 °C","Fastening Method":"screw and snap-on mounting onto 35 mm standard mounting rail","Mounting Position":"vertical","PROFIsafe protocol":"No","Product Brand Name":"SIRIUS","Type Of Assignment":"2","Product Designation":"Direct (on-line) starter","Size Of Load Feeder":"S0","PROFINET IO protocol":"No","at 400 V rated value":"15 000 W","at 480 V rated value":"14 A","at 50 Hz rated value":"230 ... 230 V","Design Of The Product":"for standard rail or screw mounting","For Main Current Circuit":"screw-type terminals","Temperature Compensation":"-20 ... +60 °C","at 220/230 V rated value":"10 hp","at 460/480 V rated value":"20 hp","at 575/600 V rated value":"25 hp","Of The Supplied Contactor":"3RT2027-1AP00","Of The Supplied Link Module":"3RA2921-1AA00","Size Of The Circuit-Breaker":"S0","at AC-3 rated value maximum":"690 V","at AC-3 at 400 V rated value":"29 A","Substance Prohibitance (Date)":"10/01/2009","Design Of The Overload Release":"thermal (bimetallic)","Design Of The Switching Contact":"electromechanical","Operating Frequency Rated Value":"50 ... 60 Hz","Design Of The Short-Circuit Trip":"magnetic","Of The Supplied Circuit-Breakers":"3RV2021-4EA10","degree of protection NEMA rating":"other","For Auxiliary And Control Circuit":"screw-type terminals","Product Extension Auxiliary Switch":"Yes","Relative Humidity During Operation":"10 ... 95 %","Surge Voltage Resistance Rated Value":"6 kV","Number Of Poles For Main Current Circuit":"3","Product Function Short Circuit Protection":"Yes","apparent holding power of magnet coil at AC":"9.8 VA","protocol is supported AS-Interface protocol":"No","with high demand rate according to SN 31920":"73 %","shock resistance according to IEC 60068-2-27":"6g / 11 ms","Type Of Voltage Of The Control Supply Voltage":"AC","at 400 V according to IEC 60947-4-1 rated value":"150 000 A","Mechanical Service Life (Switching Cycles) Of Contactor Typical":"10 000 000","insulation voltage with degree of pollution 3 at AC rated value":"690 V","Adjustable Current Response Value Current Of The Current-Dependent Overload Release":"27 ... 32 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/246b65fcc329eda2bd9ac786ea10c87f.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=356871&mlfb=3RA2120-4EA27-0AP0"},"ai":{"faq":[{"question":"What is the AC-3 rated current of this motor starter at 400 V?","answer":"The AC-3 rating is the switching current under motor starting conditions, not the continuous thermal current."},{"question":"What compliance documentation is available for the 3RA2120-4EA27-0AP0?","answer":"Standard Siemens SIRIUS documentation includes CE, UL, and CSA certifications per the series declaration."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RA2120-4EA27-0AP0","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/3RA2120-4EA27-0AP0 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}}