{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RA2120-1EA23-0BB4","brand":"Siemens","brandSlug":"siemens","productSlug":"3RA2120-1EA23-0BB4","canonicalUrl":"https://aoctrl.com/siemens/3RA2120-1EA23-0BB4","factsUrl":"https://aoctrl.com/api/mcp/products/3RA2120-1EA23-0BB4","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RA2120-1EA23-0BB4 non-fused motor starter, Size S0, direct starter design, 24 V control, thermal bimetallic overload, Class 10, 3.95 A at 480 V, snap-on DIN rail.","salesMarkdown":"## What the 3RA2120-1EA23-0BB4 carries — and what that means for a panel build This is a Siemens SIRIUS 3RA2 non-fused direct starter, Size S0, rated for AC-3 motor switching up to 690 V. The 24 V control coil matches standard PLC-level signals — no separate 110 V or 230 V control transformer needed for the starter itself. At 480 V it is rated 3.95 A (2 hp), and at 600 V it carries 4 A (3 hp) — the current ceiling is consistent across the 480–600 V band, so the same starter covers both 480 V and 600 V motor FLA in that range. ## Mounting and panel fit — DIN rail or screw, with clearances Snaps onto standard DIN rail (35 mm) or can be screw-mounted with the included push-in lug — the same part serves both a quick-panel build and a retrofit where the rail is already full. The footprint is 45 mm wide × 193.1 mm tall × 107 mm deep — the width is a single 45 mm slot on the rail, and the depth fits a 120 mm deep enclosure with room for wiring behind the starter. Clearance requirements: 30 mm above, 10 mm below, 10 mm forward, 9 mm to the side — the tight side gap (9 mm) means adjacent starters can be packed closely on the rail, but the 30 mm top clearance must be respected for the bimetallic trip mechanism to vent heat. ## What is inside the box — contactor and link module pre-assembled The starter ships with the contactor 3RT2023-1BB40 and the link module 3RA2921-1BA00 already assembled — no separate ordering or wiring between the contactor and overload. The link module carries the power bus between the two devices and the control wiring interface. The design is a direct starter (non-reversing) — one contactor, one overload, no reversing interlock. For reversing duty you need a separate 3RA2 reversing starter or add a second contactor with mechanical interlock. The 3RA2 series is the current SIRIUS motor starter platform; no successor order code exists for this specific variant. The 3RT2023 contactor and 3RA2921 link module inside are also current catalog items, so spares are available independently.","metaTitle":"Siemens 3RA2120-1EA23-0BB4 Motor Starter, S0, 24 V","metaDescription":"Siemens SIRIUS 3RA2120-1EA23-0BB4 non-fused motor starter, 24 V control, thermal Class 10, 3.95 A at 480 V. Active production, quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Motor Starters"],"specifications":{"Depth":"107 mm","Width":"45 mm","title":"3RA2120-1EA23-0BB4","Height":"193.1 mm","Upwards":"30 mm","Forwards":"10 mm","Backwards":"0 mm","Downwards":"10 mm","Trip Class":"CLASS 10","At The Side":"9 mm","Rated Value":"24 V","description":"Fuseless motor starter Direct start 600VAC Size S0 2.8-4A 24V DC screw connection For screw mounting Or 35 mm rail-mounting Type of coordination 2 IQ = 150 KA Also full fills type Of coordination 1 1NO+1NC (contactor)","During Storage":"-50 ... +80 °C","lifecycle_stage":"current","During Operation":"-20 ... +60 °C","During Transport":"-55 ... +80 °C","Fastening Method":"Snap-mounted to DIN rail or screw-mounted with additional push-in lug","Mounting Position":"vertical","Product Brand Name":"SIRIUS","Type Of Assignment":"2","Degree Of Pollution":"3","Product Designation":"non-fused motor starter 3RA2","Size Of Load Feeder":"S0","at 230 V rated value":"0.33 hp","at 400 V rated value":"1 500 W","at 480 V rated value":"3.95 A","at 500 V rated value":"2 200 W","at 600 V rated value":"4 A","Design Of The Product":"direct starter","at 110/120 V rated value":"0.13 hp","at 200/208 V rated value":"0.75 hp","at 220/230 V rated value":"0.75 hp","at 460/480 V rated value":"2 hp","at 575/600 V rated value":"3 hp","Of The Supplied Contactor":"3RT2023-1BB40","Of The Supplied Link Module":"3RA2921-1BA00","Size Of The Circuit-Breaker":"S00","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":"3RV2011-1EA10","Product Extension Auxiliary Switch":"Yes","holding power of magnet coil at DC":"5.9 W","Surge Voltage Resistance Rated Value":"6 kV","Number Of Poles For Main Current Circuit":"3","Product Function Short Circuit Protection":"Yes","number of NC contacts for auxiliary contacts":"1","number of NO contacts for auxiliary contacts":"1","shock resistance according to IEC 60068-2-27":"6g / 11 ms","at 400 V according to IEC 60947-4-1 rated value":"153 000 A","operational current at AC-3 at 400 V rated value":"3.6 A","Type Of Electrical Connection For Main Current Circuit":"screw-type terminals","Mechanical Service Life (Operating Cycles) Of Contactor Typical":"10 000 000","Response Value Current Of Instantaneous Short-Circuit Trip Unit":"52 A","insulation voltage with degree of pollution 3 at AC rated value":"690 V","Type Of Connectable Conductor Cross-Sections For Main Contacts Stranded":"1 ... 10 mm², 2x (2.5 ... 6 mm²)","Adjustable Current Response Value Current Of The Current-Dependent Overload Release":"2.8 ... 4 A","Connectable Conductor Cross-Section For Main Contacts Finely Stranded With Core End Processing":"1 ... 6 mm²"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/03cab3ee9a15d84afb9ebf291c0c28e5.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=448588&mlfb=3RA2120-1EA23-0BB4"},"ai":{"faq":[{"question":"What is the depth of 3RA2120-1EA23-0BB4?","answer":"The depth is 107 mm, which fits a standard 120 mm deep enclosure with clearance for wiring behind the starter. The overall height is 193.1 mm and width is 45 mm."},{"question":"What compliance documentation does Siemens provide for 3RA2120-1EA23-0BB4?","answer":"Standard Siemens SIRIUS documentation includes a CE declaration, UL/CSA file, and IEC 60947-4-1 test reports — available on request with the RFQ."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RA2120-1EA23-0BB4","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/3RA2120-1EA23-0BB4 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}}