{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RA2120-1KE24-0AP0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RA2120-1KE24-0AP0","canonicalUrl":"https://aoctrl.com/siemens/3RA2120-1KE24-0AP0","factsUrl":"https://aoctrl.com/api/mcp/products/3RA2120-1KE24-0AP0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS direct online starter, size S0, 11 A at 480 V AC-3, Class 10, screw and DIN-rail mount, spring-loaded terminals.","salesMarkdown":"## What this SIRIUS direct starter is and what it carries The Siemens 3RA2120-1KE24-0AP0 is a SIRIUS direct online starter in the size S0 footprint — a factory-assembled combination of a contactor, thermal overload relay, and link module in one package, ready to bolt into a motor branch circuit. It ships with a 3RT2024-2AP00 contactor and a 3RA2921-2AA00 link module, so you get a matched set out of the box — no separate ordering of the contactor and overload. ## Trip class, mounting, and the thermal protection story Spring-loaded terminals on the main current circuit — no screw torque to check, no loosening from vibration — which is a time-saver on the panel build and a reliability win on a machine that shakes. Clearance requirements: 50 mm above, 20 mm forward, 20 mm at the sides, 10 mm below, and zero backward — tight enough that you can stack these starters in a row without a lot of dead air.","metaTitle":"Siemens 3RA2120-1KE24-0AP0 SIRIUS Direct Starter, S0","metaDescription":"Siemens 3RA2120-1KE24-0AP0 SIRIUS direct online starter, size S0. Rated 11 A at 480 V AC-3, Class 10 trip. Supplied with 3RT2024 contactor and link module.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Motor Starters"],"specifications":{"Depth":"107 mm","Width":"45 mm","title":"3RA2120-1KE24-0AP0","Height":"243 mm","Upwards":"50 mm","Forwards":"20 mm","at 50 Hz":"0.25","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 9.00...12.5 A 230 V AC Spring-type 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 DIN 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 230 V rated value":"2 hp","at 400 V rated value":"5 500 kW","at 480 V rated value":"11 A","at 50 Hz rated value":"230 ... 230 V","at 600 V rated value":"10 A","Design Of The Product":"for standard rail or screw mounting","For Main Current Circuit":"spring-loaded terminals","Temperature Compensation":"-20 ... +60 °C","at 110/120 V rated value":"0.75 hp","at 200/208 V rated value":"3 hp","at 220/230 V rated value":"3 hp","at 460/480 V rated value":"7.5 hp","at 575/600 V rated value":"10 hp","Of The Supplied Contactor":"3RT2024-2AP00","Of The Supplied Link Module":"3RA2921-2AA00","Size Of The Circuit-Breaker":"S0","at AC-3 rated value maximum":"690 V","at AC-3 at 400 V rated value":"12 A","at AC-3e rated value maximum":"690 V","Substance Prohibitance (Date)":"03/01/2017","at AC-3e at 400 V rated value":"12 A","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":"3RV2021-1KA20","degree of protection NEMA rating":"other","For Auxiliary And Control Circuit":"spring-loaded terminals","Product Extension Auxiliary Switch":"Yes","Relative Humidity During Operation":"10 ... 95 %","Without Load Current Share Typical":"7.6 W","Surge Voltage Resistance Rated Value":"6 kV","at AC in hot operating state per pole":"3.4 W","Number Of Poles For Main Current Circuit":"3","Product Function Short Circuit Protection":"Yes","apparent holding power of magnet coil at AC":"7.6 VA","protocol is supported AS-Interface protocol":"No","with high demand rate according to SN 31920":"73 %","reference code according to IEC 81346-2:2019":"Q","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","Inductive Power Factor With The Holding Power Of The Coil":"0.25","Mechanical Service Life (Operating Cycles) Of Contactor Typical":"10 000 000","Response Value Current Of Instantaneous Short-Circuit Trip Unit":"163 A","insulation voltage with degree of pollution 3 at AC rated value":"690 V","Adjustable Current Response Value Current Of The Current-Dependent Overload Release":"9 ... 12.5 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/afaefedcc2ecc5baff2044469777c7f2.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=317279&mlfb=3RA2120-1KE24-0AP0"},"ai":{"faq":[{"question":"What is 3RA2120-1KE24-0AP0's listed depth on this Motor Starters line?","answer":"The depth is 107 mm, with a width of 45 mm and a height of 243 mm. It mounts vertically on a 35 mm DIN rail or with screws, and requires 50 mm clearance above, 20 mm forward, 20 mm at the sides, and 10 mm below."},{"question":"What motor horsepower ratings does this starter cover at common voltages?","answer":"The current ratings are 11 A at 480 V and 10 A at 600 V in AC-3 duty."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RA2120-1KE24-0AP0","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/3RA2120-1KE24-0AP0 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}}