{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RA2125-4CA27-0AP6","brand":"Siemens","brandSlug":"siemens","productSlug":"3RA2125-4CA27-0AP6","canonicalUrl":"https://aoctrl.com/siemens/3RA2125-4CA27-0AP6","factsUrl":"https://aoctrl.com/api/mcp/products/3RA2125-4CA27-0AP6","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RA2125-4CA27-0AP6 non-fused motor starter, direct starter design, Size S0, 11 kW at 400 V AC-3, CLASS 10, 45 x 97.1 x 193.1 mm.","salesMarkdown":"## Motor protection for the pit and the panel The 3RA2125-4CA27-0AP6: This SIRIUS 3RA2 non-fused motor starter is a direct starter (non-reversing) with a bimetallic thermal overload relay built into the assembly — designed for the S0 feeder size. For a mine conveyor or mill feeder motor that sees frequent starts, that coordination matters. Mounting is snap-on to DIN rail or screw-mount with an additional push-in lug, and the unit is rated for vertical mounting only. The 45 mm width fits standard S0 panel layouts; with a depth of 97.1 mm and height of 193.1 mm, it leaves clearance for wiring and the supplied link module (3RA2921-1AA00) that connects the contactor and circuit-breaker section. ## Power ratings and voltage coverage Across the common industrial voltages, this starter delivers: 11 kW (15 hp) at 460/480 V, 21.9 A at 600 V, and 22 A at 480 V. It also covers 3 hp at 230 V, 5 hp at 200/208 V, 7.5 hp at 220/230 V, and 20 hp at 575/600 V — so it spans the 200–600 V range that covers most North American and European motor nameplates. The maximum rated operational voltage is 690 V, which gives headroom for 600 V class systems. The supplied contactor is a 3RT2027-1AP60, and the thermal overload release is electromechanical (bimetallic) — no electronic trip curve to set, just the dial on the front. The 3RA2125-4CA27-0AP6 is part of the SIRIUS 3RA2 family, which is Siemens' compact motor starter platform for standard motor control centers and standalone panels. If you're maintaining a panel that was specified around a different SIRIUS variant, the mounting footprint and S0 sizing are consistent across the series — but the supplied contactor (3RT2027-1AP60) and link module (3RA2921-1AA00) are specific to this order code. ## Clearance and environmental limits for installation Clearance requirements around the unit: 30 mm upwards, 10 mm forwards, 10 mm downwards, 9 mm at the side, and 0 mm backwards (mounting surface). These are the minimum air gaps for heat dissipation from the bimetallic overload and the contactor coil — pack it tighter and you'll see nuisance trips on the thermal curve. Operating temperature range is -20 to +60 °C; storage range is -50 to +80 °C; transport range is -55 to +80 °C. Pollution degree 3 means it's rated for the conductive dust and humidity you'd find in a crusher house or mill building — not a clean room. The enclosure is not sealed (IP20 typical for SIRIUS contactor assemblies), so it lives inside a panel or MCC bucket.","metaTitle":"Siemens 3RA2125-4CA27-0AP6 SIRIUS non-fused motor starter","metaDescription":"Siemens SIRIUS 3RA2125-4CA27-0AP6 non-fused motor starter, direct starter design, 11 kW at 400 V AC-3, CLASS 10 thermal overload.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Motor Starters"],"specifications":{"Depth":"97.1 mm","Width":"45 mm","title":"3RA2125-4CA27-0AP6","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":"690 V","description":"FUSELESS MOTOR STARTER DIRECT START 600V AC SZ S0 17-22A 220/240V AC 50/60HZ SCREW CONNECTION FOR SCREW MOUNTING OR 35 MM RAIL-MOUNTING TYPE OF COORDINATION 2 IQ = 50 KA ALSO FULFILLS TYPE OF COORDINATION 1 1NO+1NC (MSP) 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":"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","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)","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":"3RV2021-4CA15","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":"2","number of NO contacts for auxiliary contacts":"2","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 (Operating 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","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":"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/d963769744d298197e9e9d648b8d9bbd.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=397126&mlfb=3RA2125-4CA27-0AP6"},"ai":{"faq":[{"question":"What is 3RA2125-4CA27-0AP6 used for?","answer":"It's a non-fused motor starter (direct starter) for controlling and protecting three-phase motors up to 11 kW at 400 V AC-3. It combines a contactor and a thermal (bimetallic) overload relay in a single S0-size assembly, designed for snap-on DIN rail mounting in motor control centers or standalone panels."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RA2125-4CA27-0AP6","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/3RA2125-4CA27-0AP6 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}