{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RA2120-1CD23-0BB4","brand":"Siemens","brandSlug":"siemens","productSlug":"3RA2120-1CD23-0BB4","canonicalUrl":"https://aoctrl.com/siemens/3RA2120-1CD23-0BB4","factsUrl":"https://aoctrl.com/api/mcp/products/3RA2120-1CD23-0BB4","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RA2 non-fused direct motor starter, size S0, 750 W at 400 V AC-3, Class 10, 24 V DC coil, 45 mm width, 165 mm depth, 260 mm height.","salesMarkdown":"## SIRIUS 3RA2 non-fused motor starter — what ships in the box The 3RA2120-1CD23-0BB4: This is a Siemens SIRIUS 3RA2 non-fused direct starter, size S0, assembled and tested as a single unit. It ships with a 3RT2023-1BB40 contactor, a 3RA2921-1BA00 link module, and a 8US1251-5NT10 busbar adapter — the three sub-assemblies that make the starter ready to snap onto a 60 mm busbar system. The overload release is thermal bimetallic, Class 10 trip characteristic, which means it protects standard squirrel-cage motors during start-up without nuisance tripping on normal acceleration. The switching contact is electromechanical, not solid-state. ## Rated power and voltage — AC-3 duty across global line voltages At 400 V AC-3 the starter is rated 750 W; at 500 V it delivers 1 100 W. The maximum AC-3 operating voltage is 690 V. The coil is 24 V DC — confirm your control voltage matches; a 24 V DC coil on a 24 V AC supply will not hold in. The unit draws its control power from the busbar system via the supplied adapter, keeping the panel wiring clean. ## Mounting and clearances — panel integration notes The starter snaps onto 60 mm busbar systems (the standard Siemens S0/S00 busbar footprint). Mounting position is vertical only. Dimensions: 45 mm wide, 165 mm deep, 260 mm tall — it occupies a single 45 mm slot on the busbar. Required clearances around the unit: 30 mm upwards, 10 mm forwards, 10 mm downwards, 9 mm at the sides, 0 mm backwards. These are the minimum air gaps for heat dissipation and arc flash containment — do not compress them in a dense panel. ## Lifecycle and compliance — active, with documentation 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 — suitable for industrial environments with conductive dust or occasional condensation.","metaTitle":"Siemens 3RA2120-1CD23-0BB4 SIRIUS Motor Starter","metaDescription":"Siemens 3RA2120-1CD23-0BB4 SIRIUS non-fused motor starter, 750 W at 400 V AC-3, Class 10, 24 V coil. 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":"165 mm","Width":"45 mm","title":"3RA2120-1CD23-0BB4","Height":"260 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 1.8-2.5A 24V DC screw connection For snapping onto 60 mm busbar systems Type of coordination 2 IQ = 150 KA Also full fills type Of coordination 1 1NO+1NC (contactor)","During Storage":"-50 ... +80 °C","lifecycle_stage":"current","During Operation":"-20 ... +60 °C","During Transport":"-55 ... +80 °C","Fastening Method":"for snapping onto 60 mm busbar systems","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":"0.17 hp","at 400 V rated value":"750 W","at 480 V rated value":"2.15 A","at 500 V rated value":"1 100 W","at 600 V rated value":"2.24 A","Design Of The Product":"direct starter","at 200/208 V rated value":"0.5 hp","at 220/230 V rated value":"0.5 hp","at 460/480 V rated value":"1 hp","at 575/600 V rated value":"1.5 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)","Of The Supplied Busbar Adapter":"8US1251-5NT10","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":"3RV2011-1CA10","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":"32.5 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":"1.8 ... 2.5 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/2f94e5544615a2406682ede8c978ce2b.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=107514&mlfb=3RA2120-1CD23-0BB4"},"ai":{"faq":[{"question":"What compliance documentation does Siemens provide for 3RA2120-1CD23-0BB4?","answer":"Full declarations and certificates are available on request with your order."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RA2120-1CD23-0BB4","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/3RA2120-1CD23-0BB4 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}}