{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RA2125-4DD27-0AP6","brand":"Siemens","brandSlug":"siemens","productSlug":"3RA2125-4DD27-0AP6","canonicalUrl":"https://aoctrl.com/siemens/3RA2125-4DD27-0AP6","factsUrl":"https://aoctrl.com/api/mcp/products/3RA2125-4DD27-0AP6","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RA2125-4DD27-0AP6 non-fused motor starter, size S0, direct starter design, 22.2 A at 480 V, Class 10 trip, thermal bimetallic overload, snap-on 60 mm busbar.","salesMarkdown":"The Siemens SIRIUS 3RA2125-4DD27-0AP6 is a non-fused motor starter in size S0, configured as a direct starter. It ships with a 3RT2027-1AP60 contactor and a 3RA2921-1AA00 link module, plus a thermal bimetallic overload relay set to Class 10 trip curve. Rated for 22.2 A at 480 V and 11 kW at 400 V, it handles motors up to 15 hp at 460/480 V or 20 hp at 575/600 V. The coil accepts 176–242 V at 50 Hz and 192–264 V at 60 Hz. Mounting is vertical, snapping onto 60 mm busbar systems — no DIN rail adapter needed. The unit is 45 mm wide, 155 mm deep, and 260 mm tall, with 30 mm clearance upward, 10 mm forward and downward, and 9 mm at the sides. Pollution degree 3 rated, it operates from -20 to +60 °C and stores from -50 to +80 °C. The thermal bimetallic design tracks motor heating closely, resetting automatically after cooldown. Wire range for main contacts is 1–10 mm² stranded, or 2× (2.5–6 mm²). The SIRIUS family is a broadly stocked, fast-moving line across MRO inventories. If you are kitting a panel that was originally specified with a 3RV2023-4DA10 or similar S0 circuit-breaker-based starter, the 3RA2125-4DD27-0AP6 is a non-fused alternative — same S0 footprint, same busbar snap-on, but with the overload and contactor integrated as a single order code rather than a separate breaker. No rewiring of the load feeder is needed if the panel was laid out for S0 components. Wire the main circuit with 1–10 mm² stranded conductors. For dual-feed applications, two conductors of 2.5–6 mm² each are permitted. The supplied link module bridges the contactor and overload — no extra bus bars needed. Coil wiring is polarity-sensitive for DC versions; this AC coil has no polarity requirement.","metaTitle":"Siemens 3RA2125-4DD27-0AP6 SIRIUS Non-Fused Motor Starter","metaDescription":"Siemens SIRIUS 3RA2125-4DD27-0AP6 non-fused motor starter, size S0, 22.2A at 480V, Class 10, snap-on 60mm busbar. Active production. Sourced 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","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","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":"22.2 A","at 50 Hz rated value":"176 ... 242 V","at 500 V rated value":"15 000 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":"2 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":"3RV2021-4DA15","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 (Switching Cycles) Of Contactor Typical":"10 000 000","Response Value Current Of Instantaneous Short-Circuit Trip Unit":"325 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":"20 ... 25 A","Connectable Conductor Cross-Section For Main Contacts Finely Stranded With Core End Processing":"1 ... 6 mm²"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=266567&mlfb=3RA2125-4DD27-0AP6","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RA2125-4DD27-0AP6/alternatives.json"},"ai":{"faq":[{"question":"Who supplies 3RA2125-4DD27-0AP6 and how is it quoted?","answer":"This part is supplied through independent industrial automation distribution channels. Submit an RFQ for current pricing and availability — quotes are confirmed at time of request with no minimum volume commitment."},{"question":"What is the closest functional second-source to 3RA2125-4DD27-0AP6?","answer":"The 3RV2023-4DA10 is a circuit-breaker-based S0 motor starter from the same SIRIUS family, but it is a fused design with a separate overload. The 3RA2125-4DD27-0AP6 is a non-fused integrated starter. Both share the S0 footprint and snap onto 60 mm busbars, but they are not direct drop-in replacements without reviewing the protection scheme."},{"question":"What is the depth of 3RA2125-4DD27-0AP6?","answer":"The depth is 155 mm, with a width of 45 mm and height of 260 mm. Clearance of 30 mm is needed above and 10 mm below."},{"question":"Will 3RA2125-4DD27-0AP6 drop into a panel specified around 3RV2023-4DA10?","answer":"Yes, both are S0 size and snap onto 60 mm busbars, so the physical mounting is identical. However, the 3RA2125-4DD27-0AP6 is a non-fused starter with an integrated overload, while the 3RV2023-4DA10 includes a circuit breaker. Verify the protection coordination — the non-fused version relies on upstream protection."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RA2125-4DD27-0AP6","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/3RA2125-4DD27-0AP6 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-09-02T08:15:54.622Z","lastPublished":"2026-09-02T08:15:54.622Z","indexable":true}}