{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RA2125-1KA24-0AP6","brand":"Siemens","brandSlug":"siemens","productSlug":"3RA2125-1KA24-0AP6","canonicalUrl":"https://aoctrl.com/siemens/3RA2125-1KA24-0AP6","factsUrl":"https://aoctrl.com/api/mcp/products/3RA2125-1KA24-0AP6","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RA2125-1KA24-0AP6 non-fused motor starter, direct starter design, S0 size, 5.5 kW at 400 V AC-3, Class 10 thermal bimetallic overload relay, 690 V rated insulation, 45 mm width, snap-on DIN rail mount.","salesMarkdown":"## Motor ratings that govern the fit The 3RA2125-1KA24-0AP6: At 460/480 V it is rated 7.5 hp; at 575/600 V it delivers 10 hp — the voltage-dependent power ratings let you match the starter to the motor nameplate without oversizing. That is the standard protection for standard-start induction motors — fast enough to protect the winding during a stall, slow enough to ride through the starting inrush on a normal start. The degree of pollution 3 rating means it is suitable for industrial environments where conductive dust or occasional condensation is present — typical for a motor control centre (MCC) or a standalone panel on the plant floor. ## Panel fit and mounting — what the dimensions actually tell you Width is 45 mm — that is a single S0-size module on the DIN rail. Height is 193.1 mm and depth is 97.1 mm, so it projects about 100 mm from the rail. The S0 frame size is the mid-range in the SIRIUS feeder family; it sits between the compact S00 and the larger S2/S3 frames that handle higher currents. Snap-mounted to DIN rail or screw-mounted with an additional push-in lug — the mounting position is vertical only. Clearance distances are specified: 30 mm upwards, 10 mm forwards, 10 mm downwards, 9 mm at the side, and 0 mm backwards. That backwards-zero figure means the back of the housing can sit flush against the panel backplate, which simplifies layout in a tight enclosure. The supplied contactor is a 3RT2024-1AP60 and the supplied link module is a 3RA2921-1AA00 — these are the matched components that make this a coordinated starter assembly, not a random contactor-and-relay pair. The main contact wiring accepts stranded conductors from 1 to 10 mm², or two conductors of 2.5 to 6 mm² each. ## Environmental limits for storage and operation Operating temperature range is -20 to +60 °C; storage range is -50 to +80 °C; transport range is -55 to +80 °C. The -20 °C floor means it can sit in an unheated plant over a weekend shutdown and still start clean on Monday morning — no auxiliary heater required for most climates. Control supply voltage is 176 to 242 V at 50 Hz and 192 to 264 V at 60 Hz — that covers the standard 208-240 V control transformer taps used across North American and European panels. The coil draws from the same control bus as the PLC output, so no separate control power supply is needed.","metaTitle":"Siemens 3RA2125-1KA24-0AP6 SIRIUS Motor Starter","metaDescription":"Siemens SIRIUS 3RA2125-1KA24-0AP6 non-fused motor starter, 5.5 kW at 400 V AC-3, Class 10 thermal overload, S0 frame. Active 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","title":"3RA2125-1KA24-0AP6","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","description":"FUSELESS MOTOR STARTER DIRECT START 600V AC SZ S0 9-12.5A 220/240V AC 50/60HZ SCREW CONNECTION FOR SCREW MOUNTING OR 35 MM RAIL-MOUNTING 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":"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":"176 ... 242 V","at 500 V rated value":"7 500 W","at 60 Hz rated value":"192 ... 264 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":"3RT2024-1AP60","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)","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 (Operating 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":"$428.37","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/5014aafc011d5ec46719d3a0c3d25047.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=365151&mlfb=3RA2125-1KA24-0AP6"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RA2125-1KA24-0AP6","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/3RA2125-1KA24-0AP6 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}}