{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RA2120-4DH27-0AP0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RA2120-4DH27-0AP0","canonicalUrl":"https://aoctrl.com/siemens/3RA2120-4DH27-0AP0","factsUrl":"https://aoctrl.com/api/mcp/products/3RA2120-4DH27-0AP0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RA2120-4DH27-0AP0 direct-on-line motor starter, S0 size, 25 A AC-3 at 400 V, Class 10, for 60 mm busbar systems, spring-loaded terminals.","salesMarkdown":"## SIRIUS S0 direct-on-line starter — 25 A AC-3, Class 10 The Siemens 3RA2120-4DH27-0AP0 is a SIRIUS direct-on-line starter in the S0 load feeder size, designed for snapping onto 60 mm busbar systems. ## Supplied contactor and link module — drop-in ready This starter ships with a 3RT2027-2AP00 contactor and a 3RA2921-2AA00 link module, so the main current path and control wiring are pre-configured for the S0 frame. ## Panel fit — 45 mm wide, 260 mm tall, 165 mm deep At 45 mm wide, 260 mm tall, and 165 mm deep, the S0 footprint fits standard 60 mm busbar centers with the vertical mounting position specified. Clearance requirements: 50 mm upwards, 20 mm forwards, 20 mm at the side, 10 mm downwards, and 0 mm backwards — useful when packing multiple starters in a row.","metaTitle":"Siemens 3RA2120-4DH27-0AP0 SIRIUS Motor Starter, 25 A AC-3","metaDescription":"Siemens 3RA2120-4DH27-0AP0 SIRIUS direct-on-line starter, 25 A at 400 V AC-3, Class 10, S0 size, snap-on 60 mm busbar. Active production, quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Motor Starters"],"specifications":{"Depth":"165 mm","Width":"45 mm","title":"3RA2120-4DH27-0AP0","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 18...25 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 230 V rated value":"3 hp","at 400 V rated value":"11 000 kW","at 480 V rated value":"25 A","at 50 Hz rated value":"230 ... 230 V","at 600 V rated value":"25 A","Design Of The Product":"for 60 mm busbars","For Main Current Circuit":"spring-loaded terminals","Temperature Compensation":"-20 ... +60 °C","at 110/120 V rated value":"2 hp","at 200/208 V rated value":"7.5 hp","at 220/230 V rated value":"7.5 hp","at 460/480 V rated value":"20 hp","Of The Supplied Contactor":"3RT2027-2AP00","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":"25 A","at AC-3e rated value maximum":"690 V","Substance Prohibitance (Date)":"10/01/2009","at AC-3e at 400 V rated value":"25 A","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":"3RV2021-4DA20","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":"9.8 W","Surge Voltage Resistance Rated Value":"6 kV","at AC in hot operating state per pole":"5.8 W","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 %","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":"325 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":"18 ... 25 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/70331c44c591aab2ad9fd5f30acc9ad7.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=516043&mlfb=3RA2120-4DH27-0AP0"},"ai":{"faq":[{"question":"What is the 3RA2120-4DH27-0AP0 rated for in AC-3 duty?","answer":"The trip class is Class 10, so it handles normal motor start transients without nuisance tripping."},{"question":"Does the 3RA2120-4DH27-0AP0 come with the contactor and link module?","answer":"Yes — it ships with a 3RT2027-2AP00 contactor and a 3RA2921-2AA00 link module, pre-configured for the S0 frame."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RA2120-4DH27-0AP0","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/3RA2120-4DH27-0AP0 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}}