{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RA2125-1KA24-0AK6","brand":"Siemens","brandSlug":"siemens","productSlug":"3RA2125-1KA24-0AK6","canonicalUrl":"https://aoctrl.com/siemens/3RA2125-1KA24-0AK6","factsUrl":"https://aoctrl.com/api/mcp/products/3RA2125-1KA24-0AK6","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RA2125 non-fused motor starter, direct starter design, CLASS 10 thermal bimetallic overload, size S0, 5.5 kW at 400 V.","salesMarkdown":"The Siemens 3RA2125-1KA24-0AK6 is a SIRIUS non-fused motor starter — a direct-on-line (DOL) combination that integrates a contactor and a thermal bimetallic overload relay in a single size S0 package. It is designed for starting and protecting three-phase induction motors under AC-3 duty. Snap-mounted onto a DIN rail or screw-mounted with an additional push-in lug. Mounting position is vertical only. Dimensions: 45 mm wide × 193.1 mm high × 97.1 mm deep. The S0 feeder size and S00 circuit-breaker size mean it fits standard Siemens panel layouts alongside other SIRIUS components. Clearance requirements: 30 mm upwards, 10 mm forwards, 10 mm downwards, 9 mm at the side, and 0 mm backwards — plan your enclosure depth and ventilation accordingly. The 3RA2125-1KA24-0AK6 is rated for a maximum operating voltage of 690 V AC-3. Motor power output varies by supply: 5.5 kW at 400 V, 7.5 kW at 500 V, and 10 hp at 575/600 V. The coil is AC-operated with a rated control voltage range of 88…121 V at 50 Hz and 96…132 V at 60 Hz — confirm your control transformer taps match these bands. The supplied contactor is a 3RT2024-1AK60; the link module is 3RA2921-1AA00. The main circuit wiring accepts stranded conductors from 1…10 mm² (two per terminal 2.5…6 mm²).","metaTitle":"Siemens 3RA2125-1KA24-0AK6 SIRIUS Non-Fused Motor Starter","metaDescription":"Siemens 3RA2125-1KA24-0AK6 SIRIUS non-fused motor starter, direct-on-line, CLASS 10 thermal overload, 5.5 kW at 400 V. Current production. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Motor Starters"],"specifications":{"Depth":"97.1 mm","Width":"45 mm","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","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":"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)","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":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=173346&mlfb=3RA2125-1KA24-0AK6","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RA2125-1KA24-0AK6/alternatives.json"},"ai":{"faq":[{"question":"Is 3RA2125-1KA24-0AK6 suitable for direct on-line starting?","answer":"Yes, the product design is explicitly a direct starter (DOL). It is not intended for star-delta or soft-start configurations."},{"question":"When sourcing 3RA2125-1KA24-0AK6, what is the closest functional second-source?","answer":"The 3RV6021-4DA10 is a circuit-breaker-based motor starter protector in a similar S0 frame, but it is a different product class (fused vs non-fused) and does not include the integrated contactor and overload of the 3RA2125. For a direct functional equivalent, stick with the 3RA2125 family or consult your Siemens contactor/overload selection guide."},{"question":"What is 3RA2125-1KA24-0AK6's listed depth (97.1 mm) on this component line?","answer":"The overall depth is 97.1 mm. Forwards clearance required is 10 mm; backwards clearance is 0 mm."},{"question":"What is 3RA2125-1KA24-0AK6's listed width (45 mm) on this component line?","answer":"The width is 45 mm, which matches the standard S0 feeder size footprint for Siemens SIRIUS components."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RA2125-1KA24-0AK6","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/3RA2125-1KA24-0AK6 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}}