{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RA2125-4AA26-0AK6","brand":"Siemens","brandSlug":"siemens","productSlug":"3RA2125-4AA26-0AK6","canonicalUrl":"https://aoctrl.com/siemens/3RA2125-4AA26-0AK6","factsUrl":"https://aoctrl.com/api/mcp/products/3RA2125-4AA26-0AK6","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RA2125-4AA26-0AK6 non-fused direct motor starter, size S0, 7.5 kW at 400 V, Class 10, thermal bimetallic overload, 45 mm width, snap-on DIN rail.","salesMarkdown":"## SIRIUS non-fused direct starter — size S0, factory-matched sub-assemblies The 3RA2125-4AA26-0AK6 is a Siemens SIRIUS non-fused motor starter, designed as a direct starter in size S0. It ships as a factory-matched assembly that includes the 3RT2026-1AK60 contactor and the 3RA2921-1AA00 link module — no separate ordering or matching of components is required for the basic starter function. The overload release is thermal bimetallic (Trip Class 10), which means it protects the motor against sustained overcurrent while allowing the inrush during a standard start — a Class 10 trip curve is the common choice for general-purpose induction motors driving pumps, fans, and conveyors where the start time stays under 10 seconds. ## Mounting and panel integration — DIN rail snap-on with clearance envelope The starter fastens by snap-on mounting to a DIN rail or, alternatively, by screw mounting with an additional push-in lug. The mounting position is vertical, which is the standard orientation for heat dissipation from the thermal overload. The enclosure footprint is 45 mm wide by 193.1 mm high by 97.1 mm deep. For airflow and wiring access, the required clearances are: 30 mm upward, 10 mm forward, 10 mm downward, 9 mm at the side, and 0 mm backward — the back face sits flush against the mounting surface. The degree of pollution is rated 3, which per IEC 60947-1 means the device is suitable for environments with conductive or dry non-conductive pollution — typical for control panels in industrial settings where dust and occasional condensation are present. ## Environmental range and lifecycle status These limits cover most indoor panel environments and unheated warehouses; the -20 °C lower operating bound is relevant for outdoor enclosures in cold climates.","metaTitle":"Siemens 3RA2125-4AA26-0AK6 SIRIUS Motor Starter","metaDescription":"Siemens 3RA2125-4AA26-0AK6 SIRIUS non-fused motor starter, 7.5 kW at 400 V, Class 10, size S0. Current production. Quoted to order against RFQ.","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":"3RA2125-4AA26-0AK6","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 11-16A 110/120V 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":"7 500 W","at 480 V rated value":"15.2 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":"12.2 A","Design Of The Product":"direct starter","at 110/120 V rated value":"1 hp","at 200/208 V rated value":"3 hp","at 220/230 V rated value":"5 hp","at 460/480 V rated value":"10 hp","at 575/600 V rated value":"10 hp","Of The Supplied Contactor":"3RT2026-1AK60","Of The Supplied Link Module":"3RA2921-1AA00","Size Of The Circuit-Breaker":"S0","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","Design Of The Short-Circuit Trip":"magnetic","Of The Supplied Circuit-Breakers":"3RV2021-4AA15","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":"9.4 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","at 500 V according to IEC 60947-4-1 rated value":"100 000 A","operational current at AC-3 at 400 V rated value":"15.5 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":"208 A","insulation voltage with degree of pollution 3 at AC rated value":"690 V","Type Of Connectable Conductor Cross-Sections For Main Contacts Stranded":"1 ... 10 mm², 2x (2.5 ... 6 mm²)","Adjustable Current Response Value Current Of The Current-Dependent Overload Release":"11 ... 16 A","Connectable Conductor Cross-Section For Main Contacts Finely Stranded With Core End Processing":"1 ... 6 mm²"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/d294ca1ead433db2eb4b0a25108ff771.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=84923&mlfb=3RA2125-4AA26-0AK6"},"ai":{"faq":[{"question":"Who supplies 3RA2125-4AA26-0AK6 and how is it quoted for volume purchases?","answer":"This part is sourced through independent industrial-automation distribution."},{"question":"What is 3RA2125-4AA26-0AK6's rated power at 400 V?","answer":"At 400 V rated value, the motor power is 7.5 kW. The corresponding current at 480 V is 15.2 A, and at 600 V it is 12.2 A."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RA2125-4AA26-0AK6","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/3RA2125-4AA26-0AK6 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}}