{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RA2120-1HD24-0AP0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RA2120-1HD24-0AP0","canonicalUrl":"https://aoctrl.com/siemens/3RA2120-1HD24-0AP0","factsUrl":"https://aoctrl.com/api/mcp/products/3RA2120-1HD24-0AP0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RA2120-1HD24-0AP0 direct-on-line starter, S0 size, 3 kW at 400 V, Class 10 trip, 50/60 Hz, screw terminals, for 60 mm busbar.","salesMarkdown":"## What this SIRIUS direct starter delivers The 3RA2120-1HD24-0AP0 is a Siemens SIRIUS direct-on-line starter, size S0, rated 3 kW at 400 V and 8 A at 480 V in AC-3 duty — the right-sized spec for a pump, fan, or conveyor motor up to that power band. It ships as a pre-assembled unit with a 3RT2024-1AP00 contactor, a thermal bimetallic overload relay (Class 10), a link module, and a busbar adapter for snapping onto 60 mm busbar systems — no separate sourcing of components. The screw-type terminals on the main current circuit keep wiring straightforward for a panel builder, and the vertical mounting position fits standard enclosure layouts. ## Ratings that matter for the BOM line At 400 V, the starter handles 3 000 W; at 480 V it delivers 8 A continuous. Maximum AC-3 switching voltage is 690 V, and the operating frequency covers 50 to 60 Hz, so it fits both 50 Hz European and 60 Hz North American supply systems. The starter snaps onto 60 mm busbar systems using the included 8US1251-5NT10 busbar adapter — no DIN rail required, which saves rail space in a densely packed panel. Dimensions are 155 mm deep, 45 mm wide, and 260 mm tall. Clearance requirements: 50 mm upward, 20 mm forward, 10 mm downward, and 20 mm at the side — plan the enclosure depth and ventilation accordingly. Operating temperature range is -20 to +60 °C, storage and transport from -50 to +80 °C — the unit handles unheated warehouses and truck shipments without issue. No stock-holding claim — quoted per order.","metaTitle":"Siemens 3RA2120-1HD24-0AP0 SIRIUS Direct Starter","metaDescription":"Siemens 3RA2120-1HD24-0AP0 SIRIUS direct-on-line starter, 3 kW at 400 V, Class 10, S0 size. Active production. Quoted to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Motor Starters"],"specifications":{"Depth":"155 mm","Width":"45 mm","title":"3RA2120-1HD24-0AP0","Height":"260 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 5.50...8.00 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 400 V rated value":"3 000 W","at 480 V rated value":"8 A","at 50 Hz rated value":"230 ... 230 V","Design Of The Product":"for 60 mm busbars","For Main Current Circuit":"screw-type terminals","Temperature Compensation":"-20 ... +60 °C","at 220/230 V rated value":"2 hp","at 460/480 V rated value":"5 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","Substance Prohibitance (Date)":"10/01/2009","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":"3RV2011-1HA10","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":"8.5 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","operational current at AC-3 at 400 V rated value":"6.5 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":"5.5 ... 8 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/3584b0f9ae4d0cfcb0fb4b3fdbd45090.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=106178&mlfb=3RA2120-1HD24-0AP0"},"ai":{"faq":[{"question":"What compliance documentation does Siemens provide for 3RA2120-1HD24-0AP0?","answer":"Standard Siemens documentation includes the declaration of conformity and the product manual; check the Siemens Industry Online Support portal for the latest certificates."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RA2120-1HD24-0AP0","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/3RA2120-1HD24-0AP0 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}}