{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RA2125-1AA23-0BB4","brand":"Siemens","brandSlug":"siemens","productSlug":"3RA2125-1AA23-0BB4","canonicalUrl":"https://aoctrl.com/siemens/3RA2125-1AA23-0BB4","factsUrl":"https://aoctrl.com/api/mcp/products/3RA2125-1AA23-0BB4","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RA2125-1AA23-0BB4 non-fused motor starter, direct starter design, size S0, 690 V AC-3, Class 10, 24 V control, 50-60 Hz.","salesMarkdown":"## What the Class 10 trip and 690 V AC-3 rating mean for your motor circuit The 3RA2125-1AA23-0BB4 is a SIRIUS non-fused motor starter combining a contactor and thermal-magnetic overload in one size S0 package. The magnetic short-circuit trip handles the instantaneous fault. Rated for AC-3 duty up to 690 V, this starter switches squirrel-cage motors — making and breaking the load current during starting and stopping. The 24 V control voltage is common for PLC-driven panels where the control transformer steps down to 24 VDC or 24 VAC. The supplied contactor is a 3RT2023-1BB40, and the supplied circuit-breaker is a 3RV2011-1AA15 — meaning this is a fully coordinated starter assembly, not a loose collection of parts. The link module 3RA2921-1BA00 ties them mechanically and electrically. ## Panel fit — DIN rail footprint and mounting clearances Width is 45 mm, depth is 107 mm, height is 193.1 mm. Mounting position is vertical only. Clearance requirements: 30 mm upwards, 10 mm forwards, 10 mm downwards, 9 mm at the side, and 0 mm backwards. The zero backward clearance means it sits flush against the back panel — no extra space needed behind the DIN rail.","metaTitle":"Siemens 3RA2125-1AA23-0BB4 SIRIUS Motor Starter, 690 V AC-3","metaDescription":"Siemens 3RA2125-1AA23-0BB4 SIRIUS non-fused motor starter, 690 V AC-3, Class 10, 24 V control. Active production, quoted to order. Request a quote.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Motor Starters"],"specifications":{"Depth":"107 mm","Width":"45 mm","title":"3RA2125-1AA23-0BB4","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":"24 V","description":"Fuseless motor starter Direct start 600VAC Size S0 1.1-1.6A 24V DC screw connection For screw mounting Or 35 mm rail-mounting 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":"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":"0.1 hp","at 400 V rated value":"550 W","at 480 V rated value":"1.6 A","at 500 V rated value":"550 W","at 600 V rated value":"1.3 A","at 690 V rated value":"1 100 W","Design Of The Product":"direct starter","at 460/480 V rated value":"0.75 hp","at 575/600 V rated value":"0.75 hp","Of The Supplied Contactor":"3RT2023-1BB40","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)","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":"3RV2011-1AA15","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","operational current at AC-3 at 400 V rated value":"1.5 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":"20.8 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":"1.1 ... 1.6 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/091a2106bd18ea4e03aeb00ceb59d19f.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=288603&mlfb=3RA2125-1AA23-0BB4"},"ai":{"faq":[{"question":"What is the closest functional second-source for 3RA2125-1AA23-0BB4?","answer":"The peer MPNs listed (6ES7517-3FP00-0AB0, 6ED1052-1MD08-0BA1, 6AG1052-2FB08-7BA1) are not functional equivalents — they belong to different product families (PLC CPUs and logic modules). There is no drop-in second-source for this specific SIRIUS motor starter assembly; the 3RA2125-1AA23-0BB4 is a coordinated unit with its own contactor, link module, and circuit breaker."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RA2125-1AA23-0BB4","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/3RA2125-1AA23-0BB4 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}}