{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RA2125-1KD24-0AK6","brand":"Siemens","brandSlug":"siemens","productSlug":"3RA2125-1KD24-0AK6","canonicalUrl":"https://aoctrl.com/siemens/3RA2125-1KD24-0AK6","factsUrl":"https://aoctrl.com/api/mcp/products/3RA2125-1KD24-0AK6","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RA2125-1KD24-0AK6 non-fused direct motor starter, size S0, 5.5 kW at 400 V AC-3, Class 10, 690 V max, 45 x 260 x 155 mm.","salesMarkdown":"## Pre-assembled SIRIUS starter for motor branch circuits The Siemens 3RA2125-1KD24-0AK6 is a SIRIUS non-fused direct motor starter, size S0, combining a 3RT2024-1AK60 contactor and a thermal bimetallic overload relay in one assembly. ## Mounting and panel fit — 60 mm busbar snap-on Snaps directly onto 60 mm busbar systems in vertical mounting position; the 45 mm width and 155 mm depth fit standard S0 feeder compartments, with 30 mm clearance upward and 10 mm forward for wiring access. Main contact wire range accepts 1–10 mm² stranded (2× 2.5–6 mm²), and the supplied link module 3RA2921-1AA00 connects the contactor to the overload block without additional busbars. ## Power ratings across common supply voltages At 400 V three-phase, the starter delivers 5.5 kW (11 A at 480 V, 11 A at 600 V); at 230 V single-phase it is rated 2 hp, and at 575/600 V three-phase it reaches 10 hp. Coil control voltage is 88–121 V at 50 Hz and 96–132 V at 60 Hz, covering standard 110–120 V control circuits with a 50/60 Hz tolerance band.","metaTitle":"Siemens 3RA2125-1KD24-0AK6 SIRIUS Motor Starter","metaDescription":"Siemens 3RA2125-1KD24-0AK6 SIRIUS non-fused motor starter, 5.5 kW at 400 V, Class 10, 690 V max. Active production, quoted to order. Request a quote.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Motor Starters"],"specifications":{"Depth":"155 mm","Width":"45 mm","title":"3RA2125-1KD24-0AK6","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 600V AC SZ S0 9-12.5A 110/120V AC 50/60HZ SCREW CONNECTION FOR SNAPPING ONTO 60 MM BUSBAR SYSTEMS TYPE OF COORDINATION 2 IQ = 150 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":"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":"2 hp","at 400 V rated value":"5 500 W","at 480 V rated value":"11 A","at 50 Hz rated value":"88 ... 121 V","at 500 V rated value":"7 500 W","at 60 Hz rated value":"96 ... 132 V","at 600 V rated value":"11 A","Design Of The Product":"direct starter","at 110/120 V rated value":"0.5 hp","at 200/208 V rated value":"3 hp","at 220/230 V rated value":"3 hp","at 460/480 V rated value":"7.5 hp","at 575/600 V rated value":"10 hp","Of The Supplied Contactor":"3RT2024-1AK60","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":"3RV2011-1KA15","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":"11.5 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":"162.5 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":"9 ... 12.5 A","Connectable Conductor Cross-Section For Main Contacts Finely Stranded With Core End Processing":"1 ... 6 mm²"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$504.76","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/fe744d86e953eae59d76429fd9f30e26.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=129652&mlfb=3RA2125-1KD24-0AK6"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RA2125-1KD24-0AK6","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/3RA2125-1KD24-0AK6 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}}