{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RA2120-1JD24-0FB4","brand":"Siemens","brandSlug":"siemens","productSlug":"3RA2120-1JD24-0FB4","canonicalUrl":"https://aoctrl.com/siemens/3RA2120-1JD24-0FB4","factsUrl":"https://aoctrl.com/api/mcp/products/3RA2120-1JD24-0FB4","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS direct online starter, 3RA2120-1JD24-0FB4, Size S0, 10 A AC-3 at 400 V, CLASS 10, 24 VDC coil, for 60 mm busbar systems.","salesMarkdown":"The Siemens SIRIUS 3RA2120-1JD24-0FB4 is a direct online starter — a pre-assembled combination of a contactor and a circuit-breaker in one package, sized S0 for motor loads up to 10 A in AC-3 duty at 400 V. It ships with the 3RT2024-1FB40 contactor and the 3RA2921-1BA00 link module already integrated, so it arrives as a single unit ready to snap onto a 60 mm busbar system. The 24 VDC coil (24... 24 V rated value) means it fits standard control-voltage architectures common in PLC-driven panels. Rated operational voltage maxes out at 690 V AC-3, so it's suitable for 400 V line supplies common in industrial panels across Europe. The 45 mm width and 165 mm depth keep the panel footprint tight — it occupies one standard S0-width slot on the busbar, leaving room for adjacent feeders. Fastens by snapping onto 60 mm busbar systems — no separate DIN-rail adapter needed. Mounting position is vertical only, with 50 mm clearance upward, 20 mm forward, 20 mm at the side, and 10 mm downward for airflow and arc containment. The supplied link module handles the internal connection between the contactor and the circuit-breaker section.","metaTitle":"Siemens SIRIUS 3RA2120-1JD24-0FB4 Direct Starter, 10 A AC-3","metaDescription":"Siemens SIRIUS direct online starter 3RA2120-1JD24-0FB4, 10 A at 400 V AC-3, CLASS 10, 24 VDC coil. Active production. Sourced to order. Request a quote.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Motor Starters"],"specifications":{"Depth":"165 mm","Width":"45 mm","title":"3RA2120-1JD24-0FB4","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 7.00...10.0 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":"1.5 hp","at 400 V rated value":"4 000 kW","at 480 V rated value":"10 A","at 600 V rated value":"10 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":"0.5 hp","at 200/208 V rated value":"3 hp","at 220/230 V rated value":"3 hp","at 460/480 V rated value":"7.5 hp","at 575/600 V rated value":"10 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":"10 A","at AC-3e rated value maximum":"690 V","at AC-3e at 400 V rated value":"10 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":"3RV2011-1JA10","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":"130 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":"7 ... 10 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/a419794a9f41c2b853eff11433c38a79.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=62952&mlfb=3RA2120-1JD24-0FB4"},"ai":{"faq":[{"question":"Will 3RA2120-1JD24-0FB4 drop into a panel specified around 3RV1011-1HA10 without rewiring?","answer":"No — the 3RV1011-1HA10 is a standalone circuit-breaker (Size S00), while this 3RA2120-1JD24-0FB4 is a complete direct starter (Size S0) that includes the contactor and link module. The footprint, busbar spacing, and wiring differ; a panel designed for the 3RV1011-1HA10 would need re-engineering to accept this starter."},{"question":"Where can I buy 3RA2120-1JD24-0FB4 and what is the lead time?","answer":"This part is sourced to order; availability and pricing are confirmed at quote time. Contact our sales team for current lead time and pricing."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RA2120-1JD24-0FB4","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/3RA2120-1JD24-0FB4 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}}