{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RA2120-1FD24-0FB4","brand":"Siemens","brandSlug":"siemens","productSlug":"3RA2120-1FD24-0FB4","canonicalUrl":"https://aoctrl.com/siemens/3RA2120-1FD24-0FB4","factsUrl":"https://aoctrl.com/api/mcp/products/3RA2120-1FD24-0FB4","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RA2120-1FD24-0FB4 direct on-line starter, 5 A AC-3 at 400 V, 24 V DC coil, Class 10, size S0, for 60 mm busbar systems.","salesMarkdown":"## Motor starter for 60 mm busbar panels The 3RA2120-1FD24-0FB4: This is a Siemens SIRIUS direct on-line starter — a pre-assembled combination of a contactor and overload relay in one unit, sized S0 for 60 mm busbar systems. It snaps directly onto the busbars, saving DIN rail space and reducing wiring compared to separate components. Rated 5 A at AC-3 400 V, it switches three-phase motors up to that current in full-voltage starting duty. The 24 V DC coil matches standard PLC control voltages, so no extra transformer or relay interface is needed. ## Panel fit and mounting clearances The starter measures 45 mm wide, 165 mm deep, and 260 mm tall, mounted vertically. For airflow and arc clearance, leave 50 mm above, 20 mm in front, 20 mm to the side, and 10 mm below — no clearance needed behind the unit because it mounts on the busbar face. The main circuit uses screw-type terminals — field-friendly for 5 A motor wiring. The supplied contactor is a 3RT2024-1FB40, and the link module 3RA2921-1BA00 integrates the overload relay; the circuit-breaker section is size S00. ## Sourcing and lifecycle — active, quoted to order Operating temperature range is -20 to +60 °C, storage -50 to +80 °C, making it suitable for most industrial environments without special derating.","metaTitle":"Siemens 3RA2120-1FD24-0FB4 Direct Starter, 5 A AC-3, 24 V DC","metaDescription":"Siemens 3RA2120-1FD24-0FB4 SIRIUS direct starter, 5 A at AC-3 400 V, 24 V DC coil, Class 10, 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":"165 mm","Width":"45 mm","title":"3RA2120-1FD24-0FB4","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":"24 ... 24 V","description":"Load feeder fuseless, Direct-on-line starting 400 V AC, Size S0 3.50...5.00 A 24 V DC 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) 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":"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 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":"3RT2024-1FB40","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":"5 A","at AC-3e rated value maximum":"690 V","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":"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":"2.7 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":"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/9bb7fe48a68adf999f9ab0222c149848.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=113422&mlfb=3RA2120-1FD24-0FB4"},"ai":{"faq":[{"question":"What are the key ratings for 3RA2120-1FD24-0FB4?","answer":"It snaps onto 60 mm busbars and fits a size S0 load feeder."},{"question":"How is 3RA2120-1FD24-0FB4 quoted for volume purchases?","answer":"We source it through independent distribution and confirm pricing and lead time at quote against your RFQ. Availability is confirmed at the time of quotation."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RA2120-1FD24-0FB4","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/3RA2120-1FD24-0FB4 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}}