{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RA2120-1FE24-0AP0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RA2120-1FE24-0AP0","canonicalUrl":"https://aoctrl.com/siemens/3RA2120-1FE24-0AP0","factsUrl":"https://aoctrl.com/api/mcp/products/3RA2120-1FE24-0AP0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RA2120-1FE24-0AP0 direct online starter, Size S0, Class 10 trip, 690 V AC-3 max, 1.5 kW at 400 V, screw and snap-on 35 mm DIN rail mounting, spring-loaded terminals.","salesMarkdown":"## Panel fit and what the ratings mean The 3RA2120-1FE24-0AP0: The Class 10 trip characteristic means it will hold starting current long enough for a standard induction motor to accelerate (typically 5–10 seconds at locked-rotor) but trip fast on a sustained overload. That matters when you're coordinating with upstream protection: a Class 10 starter lets you set the motor branch circuit breaker tighter than a Class 20 would. Rated maximum operating voltage is 690 V in AC-3 duty — that's the switching voltage for motor loads, not just the insulation rating. The contactor inside is a 3RT2024-2AP00, paired with a 3RA2921-2AA00 link module that ties the overload relay to the contactor mechanically and electrically. ## Mounting and clearance — what fits where Width is 45 mm, depth 107 mm, height 243 mm. It screws down or snaps onto 35 mm standard mounting rail — the snap-on foot is the same profile as the SIRIUS contactor range, so it shares the rail with other S0 devices without adapters. Mounting position is vertical only; if you lay it on its side the bimetal overload won't track ambient correctly. Clearance requirements: 50 mm upwards, 20 mm forwards, 20 mm at the side, 10 mm downwards, zero backwards. The zero backwards clearance means it can sit flush against a back panel or gland plate — useful when you're packing multiple feeders into a shallow enclosure. That simplifies MRO stock planning: one starter SKU plus the individual contactor and overload as line-replaceable units.","metaTitle":"Siemens 3RA2120-1FE24-0AP0 SIRIUS Direct Starter, Class 10","metaDescription":"Siemens SIRIUS 3RA2120-1FE24-0AP0 direct online starter, Class 10, 690 V AC-3 max, 1.5 kW at 400 V. 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":"3RA2120-1FE24-0AP0","Height":"243 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 3.50...5.00 A 230 V AC Spring-type 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)","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 standard mounting 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 400 V rated value":"1 500 W","at 480 V rated value":"4.8 A","at 50 Hz rated value":"230 ... 230 V","Design Of The Product":"for standard rail or screw mounting","For Main Current Circuit":"spring-loaded terminals","Temperature Compensation":"-20 ... +60 °C","at 200/208 V rated value":"1 hp","at 220/230 V rated value":"1 hp","at 460/480 V rated value":"3 hp","at 575/600 V rated value":"3 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)","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":"3RV2021-1FA20","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":"3.6 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":"3.5 ... 5 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/85140e53987729ed49bf0d0d08ab227f.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=248549&mlfb=3RA2120-1FE24-0AP0"},"ai":{"faq":[{"question":"What is the maximum motor power this starter handles at 400 V?","answer":"Rated at 1.5 kW at 400 V, 50/60 Hz. At 460/480 V it handles 3 hp. The AC-3 maximum switching voltage is 690 V."},{"question":"What compliance documentation is available for this part?","answer":"The substance prohibition date is March 1, 2017, indicating RoHS compliance per EU Directive 2011/65/EU. As a Siemens SIRIUS product, it carries CE and UL/CSA markings for the North American and European markets."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RA2120-1FE24-0AP0","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/3RA2120-1FE24-0AP0 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}}