{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RA2125-1DA23-0BB4","brand":"Siemens","brandSlug":"siemens","productSlug":"3RA2125-1DA23-0BB4","canonicalUrl":"https://aoctrl.com/siemens/3RA2125-1DA23-0BB4","factsUrl":"https://aoctrl.com/api/mcp/products/3RA2125-1DA23-0BB4","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RA2 non-fused motor starter, Size S0, direct starter, AC-3 rated 690 V max, Trip Class 10, 24 V coil, snap-on DIN rail, 107 × 45 × 193.1 mm.","salesMarkdown":"## AC-3 duty and motor load coverage The 3RA2125-1DA23-0BB4: Rated for AC-3 switching duty up to 690 V maximum, this Size S0 starter covers motor loads at common line voltages: 1 100 W at 400 V, 1 500 W at 500 V, and 2.8 A at 480 V or 3.16 A at 600 V. The Trip Class 10 thermal bimetallic overload release matches standard induction motor starting profiles — it allows the inrush without nuisance tripping during acceleration. ## DIN rail snap-mount, vertical only — panel layout constraint Mounts vertically on DIN rail via snap-on fastening, or screw-mounted with the additional push-in lug. The 45 mm width and 107 mm depth fit standard S0 feeder spacing; clearance requirements are 30 mm upwards, 10 mm forwards, 10 mm downwards, and 9 mm at the side — no backwards clearance needed. This vertical-only restriction means the starter cannot be laid flat in a shallow enclosure. ## Integrated assembly — supplied contactor and link module The starter ships as a complete unit with the 3RT2023-1BB40 contactor and 3RA2921-1BA00 link module pre-assembled. The 24 V coil is built in; main contact wiring accepts stranded 1–10 mm² or 2× (2.5–6 mm²). No separate ordering of contactor and overload — one order code, one assembly to swap.","metaTitle":"Siemens 3RA2125-1DA23-0BB4 SIRIUS Motor Starter, Size S0","metaDescription":"Siemens 3RA2125-1DA23-0BB4 SIRIUS non-fused motor starter, Size S0, AC-3 rated 690 V max, Trip Class 10. Active production — quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Motor Starters"],"specifications":{"Depth":"107 mm","Width":"45 mm","title":"3RA2125-1DA23-0BB4","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 2.2-3.2A 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":"0.25 hp","at 400 V rated value":"1 100 W","at 480 V rated value":"2.8 A","at 500 V rated value":"1 500 W","at 600 V rated value":"3.16 A","Design Of The Product":"direct starter","at 110/120 V rated value":"0.1 hp","at 200/208 V rated value":"0.5 hp","at 220/230 V rated value":"0.75 hp","at 460/480 V rated value":"1.5 hp","at 575/600 V rated value":"2 hp","Of The Supplied Contactor":"3RT2023-1BB40","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)","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":"3RV2011-1DA15","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":"2.7 A","Type Of Electrical Connection For Main Current Circuit":"screw-type terminals","Mechanical Service Life (Switching Cycles) Of Contactor Typical":"10 000 000","Response Value Current Of Instantaneous Short-Circuit Trip Unit":"41.6 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":"2.2 ... 3.2 A","Connectable Conductor Cross-Section For Main Contacts Finely Stranded With Core End Processing":"1 ... 6 mm²"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$561.81","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/5c68761fc3de15bd4581b7eba9517a69.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=523276&mlfb=3RA2125-1DA23-0BB4"},"ai":{"faq":[{"question":"What is the depth of 3RA2125-1DA23-0BB4?","answer":"107 mm depth, with a width of 45 mm and height of 193.1 mm. The Size S0 footprint fits standard DIN-rail feeder spacing in control panels."},{"question":"What motor power does this starter handle at 400 V?","answer":"At 500 V it handles 1 500 W; at 480 V the current rating is 2.8 A, and at 600 V it is 3.16 A."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RA2125-1DA23-0BB4","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/3RA2125-1DA23-0BB4 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}}