{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RA2120-0JA23-0BB4","brand":"Siemens","brandSlug":"siemens","productSlug":"3RA2120-0JA23-0BB4","canonicalUrl":"https://aoctrl.com/siemens/3RA2120-0JA23-0BB4","factsUrl":"https://aoctrl.com/api/mcp/products/3RA2120-0JA23-0BB4","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RA2120-0JA23-0BB4 non-fused motor starter, direct starter design, size S0, 24 V DC coil, Class 10 thermal overload, 690 V AC-3 max, 50-60 Hz.","salesMarkdown":"The 3RA2120-0JA23-0BB4: This is a SIRIUS non-fused motor starter, direct starter design, size S0. It combines a contactor and a thermal overload relay in one unit, intended for switching and protecting three-phase motors up to 690 V AC-3. The 24 V DC coil draws 5.9 W holding power — a common control voltage for PLC-driven panels. The coil is electromechanical, so expect a distinct pick-up and drop-out threshold; verify your DC supply can deliver the inrush (not listed here) before committing the BOM. Motor power ratings are given per voltage: 250 W at 400 V, 370 W at 500 V, 550 W at 690 V, and 0.5 hp at 575/600 V. These are the maximum full-load motor sizes the starter can handle at those line voltages — oversizing the motor beyond these figures risks nuisance tripping or contact welding under locked-rotor current. The mounting position is vertical only — horizontal mounting would change the thermal overload calibration. Clearance requirements: 30 mm upward, 10 mm forward, 10 mm downward, 9 mm at the side, and 0 mm backward (flush to the panel backplane). These are the minimum free-air gaps for heat dissipation and arc flash clearance. Dimensions: 193.1 mm high, 45 mm wide, 107 mm deep. The 45 mm width (about 2.5 modular DIN units) fits standard enclosure cutouts. The supplied circuit-breaker is a 3RV2011-0JA10 (size S00), and the supplied contactor is a 3RT2023-1BB40 — these are matched by the factory for coordination, so swapping either component breaks the short-circuit rating. ## Environmental and compliance notes Operating temperature range is -20 to +60 °C; storage range is -50 to +80 °C; transport range is -55 to +80 °C. The degree of pollution is 3 (conductive pollution or dry non-conductive pollution that becomes conductive due to condensation — typical in industrial control panels without climate control). The substance prohibition date is 03/01/2017, indicating RoHS compliance per EU Directive 2011/65/EU.","metaTitle":"Siemens 3RA2120-0JA23-0BB4 SIRIUS non-fused motor starter","metaDescription":"Siemens SIRIUS 3RA2120-0JA23-0BB4 non-fused motor starter, 24 V DC coil, Class 10, 690 V AC-3 max. Active production, sourced 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","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","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","Substance Prohibitance (Date)":"03/01/2017","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":"3RV2011-0JA10","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":"1","number of NO contacts for auxiliary contacts":"1","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,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/4dc062479bfb1482a84ac5ed4eb4f851.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=487648&mlfb=3RA2120-0JA23-0BB4","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RA2120-0JA23-0BB4/alternatives.json"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RA2120-0JA23-0BB4","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/3RA2120-0JA23-0BB4 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-09-02T08:15:54.622Z","lastPublished":"2026-09-02T08:15:54.622Z","indexable":true}}