{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RA2125-0GD23-0AP6","brand":"Siemens","brandSlug":"siemens","productSlug":"3RA2125-0GD23-0AP6","canonicalUrl":"https://aoctrl.com/siemens/3RA2125-0GD23-0AP6","factsUrl":"https://aoctrl.com/api/mcp/products/3RA2125-0GD23-0AP6","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RA2125-0GD23-0AP6, non-fused motor starter, S0 size, direct starter, 690 V AC-3, Class 10, 50/60 Hz, with thermal overload and magnetic short-circuit release.","salesMarkdown":"## What This Motor Starter Is and Who Specifies It The Siemens 3RA2125-0GD23-0AP6 is a SIRIUS non-fused motor starter — a direct starter in size S0 that combines a contactor, a thermal bimetallic overload relay, and a magnetic short-circuit release in one assembly. It is typically specified by panel builders and OEMs who need a coordinated motor feeder for a fixed-speed load on a 50/60 Hz line, with the short-circuit protection built in rather than relying on a separate fuse. Rated for AC-3 switching duty up to 690 V, this starter handles the inductive load of a squirrel-cage motor — starting and disconnecting it under load — not just resistive heating. The coil voltage is the deciding factor for control-circuit compatibility: the 3RA2125-0GD23-0AP6 accepts 176–242 V at 50 Hz and 192–264 V at 60 Hz, so it works on a standard 208–240 V control transformer. At 400 V the motor power rating is 180 W; at 500 V it is also 180 W; at 690 V it reaches 250 W — these are the maximum continuous motor loads the starter can switch at those line voltages. Coordination type 2 (per IEC 60947-4-1) is the assignment here — meaning after a short-circuit fault at the rated conditional current, the starter remains serviceable with only minor contact welding that can be separated without impairing function. This is the standard for most industrial motor control centers where downtime for replacement after a fault is unacceptable. ## Mounting and Integration in the Panel Mounts vertically by snapping onto 60 mm busbar systems — the standard for SIRIUS S0 feeders. The overall dimensions are 155 mm deep, 45 mm wide, and 260 mm tall, fitting a single 45 mm slot on the busbar. Clearance requirements: 30 mm upward, 10 mm forward, 10 mm downward, 9 mm at the side, and 0 mm backward — so the back can sit flush against the panel backplate. Main contact wiring accepts stranded conductors from 1 to 10 mm², or two conductors of 2.5 to 6 mm² each (AWG equivalents: 2x 16–12 or 2x 14–8). The supplied components are a 3RT2023-1AP60 contactor, a 3RA2921-1AA00 link module, a 8US1251-5NT10 busbar adapter, and a 3RV2011-0GA15 circuit breaker — everything needed for a complete feeder except the busbar itself.","metaTitle":"Siemens 3RA2125-0GD23-0AP6 SIRIUS Non-Fused Motor Starter","metaDescription":"Siemens 3RA2125-0GD23-0AP6 SIRIUS non-fused motor starter, S0 size, 690V AC-3, Class 10, 50/60Hz. Current-production part sourced to order. Request quote.","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 400 V rated value":"180 W","at 50 Hz rated value":"176 ... 242 V","at 500 V rated value":"180 W","at 60 Hz rated value":"192 ... 264 V","at 690 V rated value":"250 W","Design Of The Product":"direct starter","Of The Supplied Contactor":"3RT2023-1AP60","For Main Contacts Stranded":"1 ... 10 mm², 2x (2.5 ... 6 mm²)","Of The Supplied Link Module":"3RA2921-1AA00","Size Of The Circuit-Breaker":"S00","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":"3RV2011-0GA15","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":"7.2 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","operational current at AC-3 at 400 V rated value":"0.6 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":"8.19 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":"0.45 ... 0.63 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=289363&mlfb=3RA2125-0GD23-0AP6","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RA2125-0GD23-0AP6/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy the Siemens 3RA2125-0GD23-0AP6 motor starter?","answer":"This part is sourced to order. Availability and pricing are confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RA2125-0GD23-0AP6","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/3RA2125-0GD23-0AP6 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}}