{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RA2125-4AD26-0BB4","brand":"Siemens","brandSlug":"siemens","productSlug":"3RA2125-4AD26-0BB4","canonicalUrl":"https://aoctrl.com/siemens/3RA2125-4AD26-0BB4","factsUrl":"https://aoctrl.com/api/mcp/products/3RA2125-4AD26-0BB4","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RA2125-4AD26-0BB4 non-fused motor starter, size S0, direct starter, Class 10 thermal overload, 24 V coil, 15.2 A at 480 V AC-3, 690 V max.","salesMarkdown":"## What ships in the carton The 3RA2125-4AD26-0BB4 is a complete SIRIUS non-fused motor starter assembly — a direct starter combining a contactor, thermal overload relay, and link module on a common busbar adapter, all pre-assembled and tested as a single order code. The kit includes the supplied 3RT2026-1BB40 contactor, the 3RA2921-1BA00 link module, and the 8US1251-5NT10 busbar adapter — no separate sourcing for these subcomponents. ## Motor ratings that decide the fit Rated 15.2 A at 480 V AC-3 and 12.2 A at 600 V AC-3 — these are the continuous motor current limits for the S0 frame in standard duty. The 24 V control coil is common for PLC-driven panels where the control transformer steps down to 24 VDC or 24 VAC. ## Panel fit and clearance envelope Dimensions: 45 mm wide, 260 mm tall, 165 mm deep — the S0 frame fits a standard 8-inch deep enclosure. Mounting is vertical by snapping onto 60 mm busbar systems, which is the standard Siemens busbar pitch for this feeder size. Clearance requirements: 30 mm upwards, 10 mm forwards, 10 mm downwards, 9 mm at the side, and 0 mm backwards — the rear face sits flush against the mounting surface, so no rear breathing space is needed. Main contact wire range accepts 1 to 10 mm² stranded, or 2 × (2.5 to 6 mm²) for paralleled feeds. Pollution degree 3 means it's rated for industrial environments with conductive dust or occasional condensation — no derating needed for typical panel conditions.","metaTitle":"Siemens 3RA2125-4AD26-0BB4 SIRIUS Motor Starter","metaDescription":"Siemens 3RA2125-4AD26-0BB4 SIRIUS non-fused motor starter, size S0, Class 10, 24 V coil, 15.2 A at 480 V. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Motor Starters"],"specifications":{"Depth":"165 mm","Width":"45 mm","title":"3RA2125-4AD26-0BB4","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":"24 V","description":"FUSELESS MOTOR STARTER DIRECT START 600V AC SZ S0 11-16A 24V DC 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":"7 500 W","at 480 V rated value":"15.2 A","at 500 V rated value":"7 500 W","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":"3RT2026-1BB40","For Main Contacts Stranded":"1 ... 10 mm², 2x (2.5 ... 6 mm²)","Of The Supplied Link Module":"3RA2921-1BA00","Size Of The Circuit-Breaker":"S0","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":"3RV2021-4AA15","Product Extension Auxiliary Switch":"Yes","holding power of magnet coil at DC":"5.9 W","Surge Voltage Resistance Rated Value":"6 kV","Number Of Poles For Main Current Circuit":"3","Product Function Short Circuit Protection":"Yes","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","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","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":"$504.76","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/0cacf00496d987f4225fc2c2db7166c5.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=236131&mlfb=3RA2125-4AD26-0BB4"},"ai":{"faq":[{"question":"What motor power can the 3RA2125-4AD26-0BB4 handle at 400 V?","answer":"At 400 V AC-3, it is rated for 7.5 kW. At 480 V it handles 15.2 A which corresponds to 10 hp. The maximum AC-3 voltage is 690 V."},{"question":"What compliance documentation does Siemens provide for 3RA2125-4AD26-0BB4?","answer":"The part carries a pollution degree 3 rating for industrial environments. Standard Siemens documentation includes the declaration of conformity for the SIRIUS series covering IEC/EN 60947-4-1 and applicable EU directives. RoHS and REACH compliance is standard for current-production SIRIUS components."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RA2125-4AD26-0BB4","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/3RA2125-4AD26-0BB4 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}}