{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RA2120-1HA24-0FB4","brand":"Siemens","brandSlug":"siemens","productSlug":"3RA2120-1HA24-0FB4","canonicalUrl":"https://aoctrl.com/siemens/3RA2120-1HA24-0FB4","factsUrl":"https://aoctrl.com/api/mcp/products/3RA2120-1HA24-0FB4","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RA2120-1HA24-0FB4 direct online motor starter, size S0, 8 A AC-3 at 400 V, Class 10, screw/snap-on 35 mm DIN rail, 45 mm wide, 107 mm deep, 193 mm high, vertical mounting.","salesMarkdown":"## Panel fit — the dimensions that lock the slot The 3RA2120-1HA24-0FB4: The 193 mm height and mandatory vertical mounting position mean the enclosure depth must clear the full height without obstruction above or below. Clearance requirements: 50 mm upwards, 20 mm forwards, 20 mm at the side, 10 mm downwards — plan the panel layout around these gaps for airflow and wiring access. ## Motor protection — Class 10 trip and AC-3 current The Class 10 trip curve matches standard induction motor starting profiles: it allows up to 10 seconds of locked-rotor current before the overload opens, which covers most general-purpose motor starts without nuisance tripping. The supplied contactor 3RT2024-1FB40 and link module 3RA2921-1BA00 are pre-assembled — no separate selection of contactor and overload needed for this combination.","metaTitle":"Siemens 3RA2120-1HA24-0FB4 SIRIUS Motor Starter, 8 A AC-3","metaDescription":"Siemens SIRIUS 3RA2120-1HA24-0FB4 direct online motor starter, 8 A at 400 V AC-3, Class 10 trip, screw/snap-on DIN rail, active production. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Motor Starters"],"specifications":{"Depth":"107 mm","Width":"45 mm","title":"3RA2120-1HA24-0FB4","Height":"193 mm","Upwards":"50 mm","Forwards":"20 mm","Backwards":"0 mm","Downwards":"10 mm","Trip Class":"CLASS 10","At The Side":"20 mm","Rated Value":"24 ... 24 V","description":"Load feeder fuseless, Direct-on-line starting 400 V AC, Size S0 5.50...8.00 A 24 V DC screw 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) with diode combination plugged in at the front","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":"1 hp","at 400 V rated value":"3 000 kW","at 480 V rated value":"8 A","at 600 V rated value":"8 A","Design Of The Product":"for standard rail or screw mounting","For Main Current Circuit":"screw-type terminals","Temperature Compensation":"-20 ... +60 °C","at 110/120 V rated value":"0.33 hp","at 200/208 V rated value":"2 hp","at 220/230 V rated value":"3 hp","at 460/480 V rated value":"5 hp","at 575/600 V rated value":"7.5 hp","Of The Supplied Contactor":"3RT2024-1FB40","Of The Supplied Link Module":"3RA2921-1BA00","Size Of The Circuit-Breaker":"S00","at AC-3 rated value maximum":"690 V","at AC-3 at 400 V rated value":"8 A","at AC-3e rated value maximum":"690 V","at AC-3e at 400 V rated value":"8 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":"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 %","Without Load Current Share Typical":"5.9 W","holding power of magnet coil at DC":"5.9 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","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":"DC","at 400 V according to IEC 60947-4-1 rated value":"150 000 A","Mechanical Service Life (Operating Cycles) Of Contactor Typical":"10 000 000","Response Value Current Of Instantaneous Short-Circuit Trip Unit":"104 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":"5.5 ... 8 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/625f4c47ec31e31c61753c7e872f5914.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=182805&mlfb=3RA2120-1HA24-0FB4"},"ai":{"faq":[{"question":"What is the AC-3 current rating of 3RA2120-1HA24-0FB4?","answer":"The Class 10 trip curve handles locked-rotor current for up to 10 seconds."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RA2120-1HA24-0FB4","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/3RA2120-1HA24-0FB4 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}}