{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RA2125-0JA23-0BB4","brand":"Siemens","brandSlug":"siemens","productSlug":"3RA2125-0JA23-0BB4","canonicalUrl":"https://aoctrl.com/siemens/3RA2125-0JA23-0BB4","factsUrl":"https://aoctrl.com/api/mcp/products/3RA2125-0JA23-0BB4","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RA2125-0JA23-0BB4 non-fused motor starter, direct starter design, size S0, 250 W at 400 V, 24 VDC coil, Class 10, snap-on DIN rail.","salesMarkdown":"## SIRIUS 3RA2 non-fused motor starter — what ships in the box The 3RA2125-0JA23-0BB4: This is a Siemens SIRIUS 3RA2 non-fused direct starter — a pre-assembled combination of a 3RT2023-1BB40 contactor, a 3RV2011-0JA15 circuit-breaker, and a 3RA2921-1BA00 link module, all on a common S0 frame. The overload release is thermal bimetallic; the short-circuit trip is magnetic. At 575/600 V the rating is 0.5 hp. The maximum operating voltage in AC-3 duty is 690 V. The magnet coil is rated 24 VDC with a holding power of 5.9 W — the DC coil eliminates the hum and heat of an AC coil in continuous-duty applications. ## Panel fit and clearance envelope Dimensions are 45 mm wide, 107 mm deep, and 193.1 mm high. Mounting is vertical, snap-on to DIN rail or screw-mounted with an additional push-in lug. Clearance distances: 30 mm upwards, 10 mm forwards, 0 mm backwards, 10 mm downwards, and 9 mm at the side. The zero backwards clearance means the device can sit flush against a back panel or enclosure wall. Main contact wire range: stranded 1–10 mm² or 2×(2.5–6 mm²); AWG equivalents are 2×(16–12) or 2×(14–8). The circuit-breaker size is S00, while the load feeder is size S0. Operating temperature range is -20 to +60 °C; storage range is -50 to +80 °C; transport range is -55 to +80 °C. Pollution degree 3 (conductive pollution or dry non-conductive pollution that becomes conductive due to condensation). ## Lifecycle and sourcing — active, quoted per BOM Sourced through authorized distribution channels. The auxiliary switch extension option (Product Extension Auxiliary Switch = Yes) means the starter accepts a side-mounted auxiliary contact block without additional wiring — useful for status feedback to a PLC.","metaTitle":"Siemens 3RA2125-0JA23-0BB4 SIRIUS Motor Starter","metaDescription":"Siemens SIRIUS 3RA2125-0JA23-0BB4 non-fused motor starter, 250 W at 400 V AC-3, Class 10, 24 VDC coil. 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":"3RA2125-0JA23-0BB4","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 0.7-1A 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 400 V rated value":"250 W","at 500 V rated value":"370 W","at 690 V rated value":"550 W","Design Of The Product":"direct starter","at 575/600 V rated value":"0.5 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":"3RV2011-0JA15","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":"0.85 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":"13 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":"0.7 ... 1 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/e3e5f6c4554f6b5bca3dab2ea47a3c5b.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=362234&mlfb=3RA2125-0JA23-0BB4"},"ai":{"faq":[{"question":"What is the motor power rating of 3RA2125-0JA23-0BB4 at 400 V?","answer":"At 400 V AC-3 duty the rated motor power is 250 W. At 500 V it is 370 W, at 690 V it is 550 W, and at 575/600 V it is 0.5 hp."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RA2125-0JA23-0BB4","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/3RA2125-0JA23-0BB4 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}}