{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RA2120-1FD24-0AP0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RA2120-1FD24-0AP0","canonicalUrl":"https://aoctrl.com/siemens/3RA2120-1FD24-0AP0","factsUrl":"https://aoctrl.com/api/mcp/products/3RA2120-1FD24-0AP0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RA2120-1FD24-0AP0 direct online starter, Size S0, CLASS 10, 5 A at 480 V, 3RT2024-1AP00 contactor, 60 mm busbar mount.","salesMarkdown":"## SIRIUS S0 direct starter for 60 mm busbar systems The Siemens 3RA2120-1FD24-0AP0 is a SIRIUS S0 direct online starter — a pre-assembled unit combining a contactor and overload relay in one package, designed for snapping onto 60 mm busbar systems. It ships with a 3RT2024-1AP00 contactor and a 3RA2921-1AA00 link module, so the coordination between the switching and protection elements is factory-set. ## CLASS 10 trip and AC-3 duty ratings Rated for AC-3 duty up to 690 V, the starter handles the high inrush of motor starting and the lower running current of the full-load condition. At 480 V it is rated 5 A (3 hp), at 600 V also 5 A (5 hp), and at 230 V it delivers 0.5 hp — the current ceiling stays at 5 A across the higher voltage range, so the motor full-load amps must be at or below that figure. ## Busbar snap-on and panel clearances Fastening method is snap-on for 60 mm busbar systems — no DIN rail adapter needed, which saves rail space and reduces wiring in a motor control centre. Dimensions are 260 mm high × 45 mm wide × 155 mm deep, with required clearances of 50 mm upward, 20 mm forward, 10 mm downward, and 20 mm at the side for airflow and arc flash mitigation. Mounting position is vertical; the operating temperature range is -20 to +60 °C, with storage and transport limits of -50 to +80 °C.","metaTitle":"Siemens 3RA2120-1FD24-0AP0 SIRIUS Direct Starter, S0","metaDescription":"Siemens 3RA2120-1FD24-0AP0 SIRIUS S0 direct online starter, CLASS 10, 5 A at 480 V, snaps onto 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","title":"3RA2120-1FD24-0AP0","Height":"260 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 3.50...5.00 A 230 V AC screw terminal for 60 mm busbar systems (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":"for snapping onto 60 mm busbar systems","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":"0.5 hp","at 400 V rated value":"1 500 kW","at 480 V rated value":"5 A","at 50 Hz rated value":"230 ... 230 V","at 600 V rated value":"5 A","Design Of The Product":"for 60 mm busbars","For Main Current Circuit":"screw-type terminals","Temperature Compensation":"-20 ... +60 °C","at 110/120 V rated value":"0.25 hp","at 200/208 V rated value":"1.5 hp","at 220/230 V rated value":"1.5 hp","at 460/480 V rated value":"3 hp","at 575/600 V rated value":"5 hp","Of The Supplied Contactor":"3RT2024-1AP00","Of The Supplied Link Module":"3RA2921-1AA00","Size Of The Circuit-Breaker":"S00","at AC-3 rated value maximum":"690 V","at AC-3 at 400 V rated value":"5 A","at AC-3e rated value maximum":"690 V","Substance Prohibitance (Date)":"10/01/2009","at AC-3e at 400 V rated value":"5 A","Design Of The Overload Release":"thermal (bimetallic)","Of The Supplied Busbar Adapter":"8US1251-5NT10","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":"3RV2011-1FA10","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 %","Without Load Current Share Typical":"7.6 W","Surge Voltage Resistance Rated Value":"6 kV","at AC in hot operating state per pole":"2.7 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":"65 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":"3.5 ... 5 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/c7d9aee6217e85c18d9f9c7b6fac7fd0.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=435549&mlfb=3RA2120-1FD24-0AP0"},"ai":{"faq":[{"question":"What motor ratings does the 3RA2120-1FD24-0AP0 cover?","answer":"At 480 V it is rated 5 A (3 hp), at 600 V 5 A (5 hp), and at 230 V 0.5 hp. The AC-3 maximum voltage is 690 V, so it covers standard 480 V and 600 V motor circuits within the 5 A current limit."},{"question":"Does the 3RA2120-1FD24-0AP0 mount on a DIN rail or busbar?","answer":"It snaps directly onto 60 mm busbar systems — no DIN rail adapter is required. Clearances of 50 mm upward, 20 mm forward, 10 mm downward, and 20 mm at the side must be maintained."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RA2120-1FD24-0AP0","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/3RA2120-1FD24-0AP0 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}}