{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RA2125-1JA24-0BB4","brand":"Siemens","brandSlug":"siemens","productSlug":"3RA2125-1JA24-0BB4","canonicalUrl":"https://aoctrl.com/siemens/3RA2125-1JA24-0BB4","factsUrl":"https://aoctrl.com/api/mcp/products/3RA2125-1JA24-0BB4","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RA2125-1JA24-0BB4 non-fused motor starter, direct starter design, size S0, 24 V coil, Class 10 thermal bimetallic overload, 50/60 Hz.","salesMarkdown":"## SIRIUS 3RA2 non-fused motor starter, 24 V coil The Siemens 3RA2125-1JA24-0BB4 is a SIRIUS non-fused motor starter, a direct starter design in size S0. It ships as a pre-assembled unit combining a contactor and a thermal bimetallic overload relay, so it arrives ready to snap onto the DIN rail and wire into the motor branch circuit. The 24 V coil means this starter is intended for control circuits running at 24 VAC/DC — common in PLC-driven panels where the I/O and safety relays share a 24 V bus. ## Motor power ratings across common line voltages This starter covers a range of motor sizes depending on the supply voltage. At 400 V it is rated for 4,000 W; at 500 V it handles 5,500 W. The AC-3 switching voltage is rated up to 690 V maximum. The thermal overload is bimetallic and field-adjustable — it responds to the motor's actual current draw, not just the line voltage. The supplied contactor is a 3RT2024-1BB40, and the link module is 3RA2921-1BA00, so the assembly is a matched set from the factory. ## Mounting and panel fit — size S0 footprint The starter snaps onto a DIN rail or can be screw-mounted using the additional push-in lug. Mounting position is vertical. The envelope is 45 mm wide, 107 mm deep, and 193.1 mm tall — the S0 frame size is a common footprint in Siemens SIRIUS panels, so it fits alongside other S0 components like the 3RV2 circuit-breaker (size S00) that feeds it. Clearance requirements: 30 mm upwards, 10 mm forwards, 10 mm downwards, and 9 mm at the side. No clearance needed at the back. The operating temperature range is -20 to +60 °C, with storage from -50 to +80 °C.","metaTitle":"Siemens 3RA2125-1JA24-0BB4 SIRIUS Motor Starter, 24 V","metaDescription":"Siemens 3RA2125-1JA24-0BB4 SIRIUS non-fused motor starter, 24 V coil, Class 10 thermal overload, S0 size. 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":"3RA2125-1JA24-0BB4","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 600V AC SZ S0 7-10A 24V DC 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":"1.5 hp","at 400 V rated value":"4 000 W","at 480 V rated value":"7.92 A","at 500 V rated value":"5 500 W","at 600 V rated value":"9.19 A","Design Of The Product":"direct starter","at 110/120 V rated value":"0.5 hp","at 200/208 V rated value":"2 hp","at 220/230 V rated value":"3 hp","at 460/480 V rated value":"5 hp","at 575/600 V rated value":"7.5 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)","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":"3RV2011-1JA15","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":"8.5 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":"130 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":"7 ... 10 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/5be0dafb113172b6897da9665efd4d91.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=206027&mlfb=3RA2125-1JA24-0BB4"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RA2125-1JA24-0BB4","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/3RA2125-1JA24-0BB4 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}}