{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RA2125-1FD24-0BB4","brand":"Siemens","brandSlug":"siemens","productSlug":"3RA2125-1FD24-0BB4","canonicalUrl":"https://aoctrl.com/siemens/3RA2125-1FD24-0BB4","factsUrl":"https://aoctrl.com/api/mcp/products/3RA2125-1FD24-0BB4","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RA2125-1FD24-0BB4 non-fused motor starter, direct starter design, 24 V coil, Class 10 thermal bimetallic overload, S0 load feeder size, 45 mm width.","salesMarkdown":"## SIRIUS 3RA2 direct starter — what it is The 3RA2125-1FD24-0BB4 is a non-fused motor starter from the Siemens SIRIUS 3RA2 family, built as a direct starter with a thermal bimetallic overload relay (Class 10 trip). It comes pre-assembled with a 3RT2024-1BB40 contactor and a 3RA2921-1BA00 link module, so it wires up clean as a single unit on the rail. ## Mounting and panel fit Snaps onto 60 mm busbar systems (fastening method listed), mounts vertical only. The unit is 45 mm wide, 165 mm deep, 260 mm tall — that 45 mm width is one standard 9 mm module increment, so it takes up five modules on the DIN rail. Clearance needs: 30 mm upward, 10 mm forward, 10 mm downward, 9 mm at the side — backwards is zero, so it sits flush against the back panel. Wire range for main contacts is 1–10 mm² stranded, or 2x 2.5–6 mm².","metaTitle":"Siemens 3RA2125-1FD24-0BB4 SIRIUS Motor Starter, 24 V","metaDescription":"Siemens 3RA2125-1FD24-0BB4 SIRIUS non-fused motor starter, 24 V control, Class 10 thermal overload, S0/S00 size. Active production, quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Motor Starters"],"specifications":{"Depth":"165 mm","Width":"45 mm","title":"3RA2125-1FD24-0BB4","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 600VAC Size S0 3.5-5A 24V DC screw connection For snapping onto 60 mm busbar systems Type of coordination 2 IQ = 150 KA Also full fills 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":"0.5 hp","at 400 V rated value":"1 500 W","at 480 V rated value":"4.8 A","at 500 V rated value":"2 200 W","at 600 V rated value":"4.55 A","Design Of The Product":"direct starter","at 110/120 V rated value":"0.17 hp","at 200/208 V rated value":"1 hp","at 220/230 V rated value":"1 hp","at 460/480 V rated value":"3 hp","at 575/600 V rated value":"3 hp","Of The Supplied Contactor":"3RT2024-1BB40","For Main Contacts Stranded":"1 ... 10 mm², 2x (2.5 ... 6 mm²)","Of The Supplied Link Module":"3RA2921-1BA00","Size Of The Circuit-Breaker":"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":"3RV2011-1FA15","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":"3.6 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":"65 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":"3.5 ... 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,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/2ac6ec4c3a8a851eaf6d52ddec7d8c4e.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=285020&mlfb=3RA2125-1FD24-0BB4"},"ai":{"faq":[{"question":"How do I get current pricing and availability for 3RA2125-1FD24-0BB4?","answer":"Submit an RFQ for current pricing and lead-time confirmation."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RA2125-1FD24-0BB4","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/3RA2125-1FD24-0BB4 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-22T19:47:38.189Z","lastPublished":"2026-07-22T19:47:38.189Z","indexable":true}}