{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RA2120-4CD27-0AP6","brand":"Siemens","brandSlug":"siemens","productSlug":"3RA2120-4CD27-0AP6","canonicalUrl":"https://aoctrl.com/siemens/3RA2120-4CD27-0AP6","factsUrl":"https://aoctrl.com/api/mcp/products/3RA2120-4CD27-0AP6","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RA2120-4CD27-0AP6 non-fused motor starter, S0 size, direct starter, 11 kW at 400 V AC-3, Class 10 thermal bimetallic overload, 45 mm width, for 60 mm busbar snap-on.","salesMarkdown":"## S0 feeder — what the dimensions mean for panel layout The 3RA2120-4CD27-0AP6: This is a Siemens SIRIUS 3RA2 non-fused motor starter, S0 size, direct starter design. The 45 mm width and 155 mm depth are the critical panel clearances — the unit snaps onto a 60 mm busbar system, so the mounting footprint is governed by the busbar pitch, not the enclosure backplate. Vertical mounting is specified; side clearance of 9 mm and 10 mm forward clearance are the minimums for heat dissipation and wiring access. The supplied contactor is a 3RT2027-1AP60, and the link module is 3RA2921-1AA00 — the assembly is pre-coordinated for AC-3 switching up to 690 V. ## Rated power and current — matching the motor nameplate At 400 V, the starter is rated 11,000 W — that's the IEC AC-3 rating for a 15 hp motor at 460/480 V or 20 hp at 575/600 V. The 22 A at 480 V and 21.9 A at 600 V are the continuous current ceilings in those voltage bands. For a 230 V supply, the rating drops to 3 hp; at 200/208 V it's 5 hp.","metaTitle":"Siemens 3RA2120-4CD27-0AP6 SIRIUS Motor Starter","metaDescription":"Siemens 3RA2120-4CD27-0AP6 SIRIUS non-fused motor starter, S0 size, 11 kW at 400 V AC-3, Class 10 thermal overload, 45 mm wide. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Motor Starters"],"specifications":{"Depth":"155 mm","Width":"45 mm","title":"3RA2120-4CD27-0AP6","Height":"260 mm","Upwards":"30 mm","Forwards":"10 mm","Backwards":"0 mm","Downwards":"10 mm","Trip Class":"CLASS 10","At The Side":"9 mm","Rated Value":"690 V","description":"Fuseless motor starter Direct start 600VAC Size S0 17-22A 220/240VAC 50/60HZ screw connection For snapping onto 60 mm busbar systems Type of coordination 2 IQ = 50 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":"for snapping onto 60 mm busbar systems","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":"3 hp","at 400 V rated value":"11 000 W","at 480 V rated value":"22 A","at 50 Hz rated value":"176 ... 242 V","at 500 V rated value":"11 000 W","at 60 Hz rated value":"192 ... 264 V","at 600 V rated value":"21.9 A","Design Of The Product":"direct starter","at 110/120 V rated value":"1.5 hp","at 200/208 V rated value":"5 hp","at 220/230 V rated value":"7.5 hp","at 460/480 V rated value":"15 hp","at 575/600 V rated value":"20 hp","Of The Supplied Contactor":"3RT2027-1AP60","For Main Contacts Stranded":"1 ... 10 mm², 2x (2.5 ... 6 mm²)","Of The Supplied Link Module":"3RA2921-1AA00","Size Of The Circuit-Breaker":"S0","at AC-3 rated value maximum":"690 V","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","at AWG cables for main contacts":"2x (16 ... 12), 2x (14 ... 8)","Design Of The Short-Circuit Trip":"magnetic","Of The Supplied Circuit-Breakers":"3RV2021-4CA10","Product Extension Auxiliary Switch":"Yes","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":"9.4 VA","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","at 500 V according to IEC 60947-4-1 rated value":"100 000 A","operational current at AC-3 at 400 V rated value":"22 A","Type Of Electrical Connection For Main Current Circuit":"screw-type terminals","Inductive Power Factor With The Holding Power Of The Coil":"0.28","Mechanical Service Life (Switching Cycles) Of Contactor Typical":"10 000 000","Response Value Current Of Instantaneous Short-Circuit Trip Unit":"286 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":"17 ... 22 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/12ea4d3ff31d85bf871f884c9889eb32.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=416045&mlfb=3RA2120-4CD27-0AP6"},"ai":{"faq":[{"question":"What is the depth of 3RA2120-4CD27-0AP6?","answer":"The depth is 155 mm, width 45 mm, height 260 mm. These are the envelope dimensions for panel layout."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RA2120-4CD27-0AP6","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/3RA2120-4CD27-0AP6 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}}