{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RA2125-1CD23-0AK6","brand":"Siemens","brandSlug":"siemens","productSlug":"3RA2125-1CD23-0AK6","canonicalUrl":"https://aoctrl.com/siemens/3RA2125-1CD23-0AK6","factsUrl":"https://aoctrl.com/api/mcp/products/3RA2125-1CD23-0AK6","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RA2125-1CD23-0AK6, non-fused motor starter, size S0, direct starter, 750 W at 400 V AC-3, Class 10, thermal bimetallic overload relay, 45 mm wide.","salesMarkdown":"The Siemens SIRIUS 3RA2125-1CD23-0AK6 is a non-fused motor starter in size S0, designed as a direct starter for three-phase induction motors. It combines a contactor and a thermal bimetallic overload relay in a single, coordinated package, rated for AC-3 switching duty up to 690 V. At 400 V it handles 750 W motor loads; at 480 V the full-load current is 2.15 A, and at 600 V it is 2.24 A. This starter snaps onto 60 mm busbar systems using the included busbar adapter (8US1251-5NT10). Mounting position is vertical only. The unit occupies a 45 mm width on the busbar — two standard 22.5 mm module slots. Dimensions are 260 mm height, 45 mm width, 155 mm depth. Forwards clearance of 10 mm and sideways clearance of 9 mm are needed for air circulation and wiring access; no space is required behind the unit. The supplied link module (3RA2921-1AA00) connects the contactor coil circuit to the overload relay, so no additional control wiring between the two devices is needed. ## Wiring and connection Main contact terminals accept stranded wire from 1 to 10 mm², or two conductors of 2.5 to 6 mm² each — useful for looping through to a downstream device. The supplied contactor is a 3RT2023-1AK60; the circuit-breaker frame size is S00. Coil operating range is 88–121 V at 50 Hz and 96–132 V at 60 Hz, covering common control voltages in both 50 Hz and 60 Hz installations.","metaTitle":"Siemens 3RA2125-1CD23-0AK6 SIRIUS Non-Fused Motor Starter","metaDescription":"Siemens SIRIUS 3RA2125-1CD23-0AK6 non-fused motor starter, 750 W at 400 V AC-3, Class 10 thermal overload, 45 mm wide. Current production.","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":"0.17 hp","at 400 V rated value":"750 W","at 480 V rated value":"2.15 A","at 50 Hz rated value":"88 ... 121 V","at 500 V rated value":"1 100 W","at 60 Hz rated value":"96 ... 132 V","at 600 V rated value":"2.24 A","Design Of The Product":"direct starter","at 200/208 V rated value":"0.5 hp","at 220/230 V rated value":"0.5 hp","at 460/480 V rated value":"1 hp","at 575/600 V rated value":"1.5 hp","Of The Supplied Contactor":"3RT2023-1AK60","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":"3RV2011-1CA15","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":"1.9 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":"32.5 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":"1.8 ... 2.5 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=387457&mlfb=3RA2125-1CD23-0AK6","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RA2125-1CD23-0AK6/alternatives.json"},"ai":{"faq":[{"question":"What is the difference between 3RA2125 and 3RA2124 motor starters?","answer":"The 3RA2125-1CD23-0AK6 is a size S0 direct starter rated 750 W at 400 V AC-3, while the 3RA2124 is a smaller size S00 variant with a lower power rating. The 3RA2125 uses a 3RT2023 contactor and S00 circuit-breaker frame, whereas the 3RA2124 uses a 3RT201 contactor. The physical width differs: the 3RA2125 is 45 mm wide versus 22.5 mm for the 3RA2124."},{"question":"Where can I buy the 3RA2125-1CD23-0AK6?","answer":"This part is sourced to order against an RFQ through independent distribution. Submit a request for quote to confirm current availability and pricing; no stock count or lead-time number is published here."},{"question":"What are the key ratings for the 3RA2125-1CD23-0AK6?","answer":"Key ratings include: AC-3 switching up to 690 V, motor power 750 W at 400 V, full-load current 2.15 A at 480 V and 2.24 A at 600 V, Trip Class 10 thermal overload, coil voltage 88–121 V at 50 Hz and 96–132 V at 60 Hz, and pollution degree 3."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RA2125-1CD23-0AK6","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/3RA2125-1CD23-0AK6 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}}