{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RA2120-1BA23-0BB4","brand":"Siemens","brandSlug":"siemens","productSlug":"3RA2120-1BA23-0BB4","canonicalUrl":"https://aoctrl.com/siemens/3RA2120-1BA23-0BB4","factsUrl":"https://aoctrl.com/api/mcp/products/3RA2120-1BA23-0BB4","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RA2120-1BA23-0BB4 non-fused direct motor starter, size S0, 750 W at 400 V AC-3, Class 10 thermal bimetallic overload, 24 V DC coil, 3RT2023-1BB40 contactor, 3RA2921-1BA00 link module, DIN rail mount.","salesMarkdown":"## S0 frame, Class 10 — the overload protection that sets the starting duty The 3RA2120-1BA23-0BB4: The supplied contactor is a 3RT2023-1BB40, and the link module is 3RA2921-1BA00 — these are the integrated assembly that carries the main current path and the control wiring interface. ## Panel fit — DIN rail snap-mount and the clearance envelope Size S0 load feeder with a size S00 circuit-breaker: the starter body measures 45 mm wide, 193.1 mm high, and 107 mm deep — the width is the critical panel-space dimension, fitting a standard 45 mm slot on a DIN rail. Snap-mounts onto a DIN rail or can be screw-mounted with an additional push-in lug — vertical mounting position only, per the spec, so plan the rail orientation accordingly. Clearance distances: 30 mm upwards, 10 mm forwards, 10 mm downwards, 9 mm at the side, 0 mm backwards — these are the minimum air gaps to adjacent metalwork or enclosure walls for heat dissipation and arc flash containment. Main contact wiring accepts stranded conductors 1–10 mm² (single) or 2x 2.5–6 mm², with AWG equivalents 2x 16–12 or 2x 14–8 — sufficient for the 750 W motor circuit without over-specifying the lug. ## Motor sizing across line voltages — matching the starter to the load At 400 V rated value the starter is sized for 750 W; at 500 V it also delivers 750 W, and at 690 V it steps up to 1 100 W — the power rating climbs with voltage because the current limit stays within the contactor's thermal capacity. Operating frequency is 50/60 Hz — the same unit works on 50 Hz European or 60 Hz North American lines without derating. ## Lifecycle and compliance — active production, RoHS/REACH dated Substance prohibitance date is 03/01/2017 — this marks the RoHS/REACH compliance baseline; the starter meets the EU substance restrictions in effect from that date. Degree of pollution 3 means the unit is rated for industrial environments with conductive pollution or dry non-conductive pollution that becomes conductive due to condensation — standard for an unsealed panel-mounted starter.","metaTitle":"Siemens 3RA2120-1BA23-0BB4 SIRIUS Motor Starter","metaDescription":"Siemens 3RA2120-1BA23-0BB4 SIRIUS non-fused motor starter, 750 W at 400 V AC-3, Class 10 thermal overload, 24 VDC coil, size S0.","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 230 V rated value":"0.13 hp","at 400 V rated value":"750 W","at 480 V rated value":"1.63 A","at 500 V rated value":"750 W","at 600 V rated value":"1.72 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":"1 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":"3RV2011-1BA10","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":"1.9 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":"26 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":"1.4 ... 2 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/991f1907683bdadd292a657c7a9d542c.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=301258&mlfb=3RA2120-1BA23-0BB4","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RA2120-1BA23-0BB4/alternatives.json"},"ai":{"faq":[{"question":"What motor power does the 3RA2120-1BA23-0BB4 handle at 400 V?","answer":"At 400 V AC-3 duty it is rated for 750 W. At 690 V the rating increases to 1 100 W."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RA2120-1BA23-0BB4","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/3RA2120-1BA23-0BB4 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}}