{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RA2120-1FH24-0AP0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RA2120-1FH24-0AP0","canonicalUrl":"https://aoctrl.com/siemens/3RA2120-1FH24-0AP0","factsUrl":"https://aoctrl.com/api/mcp/products/3RA2120-1FH24-0AP0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS direct-on-line starter, 3RA2120-1FH24-0AP0, size S0, 1.5 kW at 400 V AC-3, CLASS 10, spring-loaded terminals, for 60 mm busbar systems.","salesMarkdown":"## What this starter package contains The 3RA2120-1FH24-0AP0: This is a factory-assembled SIRIUS direct-on-line starter — size S0 frame — that ships as a coordinated set: the contactor (3RT2024-2AP00), the thermal overload relay, the link module (3RA2921-2AA00), and the busbar adapter (8US1251-5NT11) are all included and wired internally. That means you pull it out of the box, snap it onto a 60 mm busbar system, land the motor leads and control wires, and commission it without piecing together separate components. ## Rated motor power and trip class At 400 V, this starter is rated for 1.5 kW motor load in AC-3 duty — that's the standard squirrrel-cage motor starting category. ## Mounting and panel integration The starter is designed to snap directly onto 60 mm busbar systems — the busbar adapter is included and the mounting position is vertical. Dimensions are 45 mm wide, 260 mm high, and 165 mm deep. Clearance: 50 mm above, 20 mm in front, 20 mm at the sides, and 10 mm below. No clearance needed behind the unit. This matters when you're laying out a dense panel — the 45 mm width per feeder means you can pack multiple starters side-by-side on the same busbar run without violating the thermal clearance envelope.","metaTitle":"Siemens 3RA2120-1FH24-0AP0 SIRIUS Direct Starter","metaDescription":"Siemens 3RA2120-1FH24-0AP0 SIRIUS direct-on-line starter, size S0, 1.5 kW at 400 V AC-3, CLASS 10 thermal overload, spring terminals.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Motor Starters"],"specifications":{"Depth":"165 mm","Width":"45 mm","title":"3RA2120-1FH24-0AP0","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":"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 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 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 60 mm busbars","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)","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":"3RV2021-1FA20","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/a5e21732504a3a81f97888a9761c3f69.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=223912&mlfb=3RA2120-1FH24-0AP0"},"ai":{"faq":[{"question":"What motor power does this starter handle at 400 V?","answer":"Rated motor power at 400 V AC-3 is 1.5 kW."},{"question":"What subcomponents are included with the 3RA2120-1FH24-0AP0?","answer":"The starter ships with a 3RT2024-2AP00 contactor, a 3RA2921-2AA00 link module, and a 8US1251-5NT11 busbar adapter — all factory-assembled into a single unit."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RA2120-1FH24-0AP0","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/3RA2120-1FH24-0AP0 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}}