{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RA2120-1HH24-0AP0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RA2120-1HH24-0AP0","canonicalUrl":"https://aoctrl.com/siemens/3RA2120-1HH24-0AP0","factsUrl":"https://aoctrl.com/api/mcp/products/3RA2120-1HH24-0AP0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RA2120-1HH24-0AP0 direct-on-line starter, size S0, 3 kW at 400 V, Class 10 trip, spring-loaded terminals, for 60 mm busbar systems.","salesMarkdown":"## SIRIUS direct starter for 60 mm busbar systems The 3RA2120-1HH24-0AP0 is a SIRIUS direct-on-line starter in size S0, designed to snap onto 60 mm busbar systems — no DIN rail adapter needed, it clips directly onto the busbar profile. Rated 3 kW at 400 V (8 A at 480 V), it handles 2 hp at 230 V and 5 hp at both 460/480 V and 575/600 V — covers common North American and IEC motor frames. The thermal bimetallic overload relay is set to Class 10 trip, meaning it protects standard squirrel-cage motors during start-up without nuisance tripping on normal acceleration. ## What ships inside — contactor, link module, busbar adapter This starter ships as a pre-assembled unit containing the 3RT2024-2AP00 contactor, the 3RA2921-2AA00 link module, and the 8US1251-5NT11 busbar adapter — one order code, one package, ready to snap onto the busbar. The main circuit uses spring-loaded terminals (cage-clamp style), so no screw torque check needed on installation — strip, insert, done. Mounting position is vertical only; clearances required are 50 mm upward, 20 mm forward, 10 mm downward, and 20 mm at the side — plan the busbar layout accordingly. ## Physical footprint and panel clearances Dimensions are 260 mm high, 45 mm wide, and 165 mm deep — the narrow width (45 mm) lets you pack multiple starters side-by-side on the same busbar run. Operating temperature range is -20 to +60 °C with no derating curve needed in that band; storage and transport range is -50 to +80 °C. ## Current production — sourcing posture RoHS compliance date is March 1, 2017 — the starter meets EU substance restrictions from that date forward.","metaTitle":"Siemens 3RA2120-1HH24-0AP0 SIRIUS Direct Starter, S0","metaDescription":"Siemens 3RA2120-1HH24-0AP0 SIRIUS direct-on-line starter, size S0, rated 3 kW at 400 V, Class 10. Snaps onto 60 mm busbars.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Motor Starters"],"specifications":{"Depth":"165 mm","Width":"45 mm","title":"3RA2120-1HH24-0AP0","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 Spring-type 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":"spring-loaded 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":"3RT2024-2AP00","Of The Supplied Link Module":"3RA2921-2AA00","Size Of The Circuit-Breaker":"S0","at AC-3 rated value maximum":"690 V","Substance Prohibitance (Date)":"03/01/2017","Design Of The Overload Release":"thermal (bimetallic)","Of The Supplied Busbar Adapter":"8US1251-5NT11","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":"3RV2021-1HA20","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 %","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/ba011f9623089568d79fd5e659fd0442.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=401121&mlfb=3RA2120-1HH24-0AP0"},"ai":{"faq":[{"question":"What is the closest functional second-source for 3RA2120-1HH24-0AP0?","answer":"The starter is a proprietary SIRIUS assembly with a supplied contactor, link module, and busbar adapter — no pin-compatible alternative from another manufacturer exists."},{"question":"What compliance documentation does Siemens provide for this starter?","answer":"RoHS compliance is confirmed with a substance prohibitance date of March 1, 2017. The starter carries the SIRIUS brand and is designed to applicable IEC/EN standards for motor starters."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RA2120-1HH24-0AP0","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/3RA2120-1HH24-0AP0 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}}