{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RA2120-0HD23-0BB4","brand":"Siemens","brandSlug":"siemens","productSlug":"3RA2120-0HD23-0BB4","canonicalUrl":"https://aoctrl.com/siemens/3RA2120-0HD23-0BB4","factsUrl":"https://aoctrl.com/api/mcp/products/3RA2120-0HD23-0BB4","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RA2120-0HD23-0BB4 non-fused motor starter, S0 size, direct starter, 180 W at 400 V, Class 10, 24 V DC coil, snap-on 60 mm busbar.","salesMarkdown":"## Panel fit and mounting — S0 frame on 60 mm busbar The 3RA2120-0HD23-0BB4: This SIRIUS non-fused motor starter occupies the S0 load feeder size, with a width of 45 mm, depth of 165 mm, and height of 260 mm. It snaps onto 60 mm busbar systems — no DIN rail adapter needed for the main power bus. Mounting position is vertical only. Clearance requirements: 30 mm upwards, 10 mm forwards, 10 mm downwards, 9 mm at the side, and 0 mm backwards from the mounting surface. ## Motor protection — thermal bimetal overload with magnetic short-circuit trip The short-circuit release is magnetic, providing instantaneous trip on high fault currents. Rated power depends on line voltage: 180 W at 400 V, 250 W at 500 V, and 370 W at 690 V, all at 50/60 Hz. Maximum operating voltage in AC-3 duty is 690 V. ## Coil and control — 24 V DC with supplied contactor The magnet coil is rated 24 V DC with a holding power of 5.9 W. The supplied contactor is a 3RT2023-1BB40, and the link module is 3RA2921-1BA00 — these are pre-assembled and wired internally for a direct starter configuration. The product extension auxiliary switch is available (Yes), so you can add auxiliary contacts for status feedback or interlocking without modifying the main assembly. ## Supplied components and wiring This starter ships with the circuit breaker 3RV2011-0HA10 (size S00) and a busbar adapter 8US1251-5NT10 for the 60 mm system. Main contact wiring accepts stranded 1–10 mm² or 2×(2.5–6 mm²); AWG equivalents are 2×(16–12) or 2×(14–8). ## Environmental and compliance Pollution degree 3 (conductive pollution or dry non-conductive that becomes conductive due to condensation). Substance prohibitance date is 03/01/2017 — RoHS/REACH compliance is current as of that date.","metaTitle":"Siemens 3RA2120-0HD23-0BB4 SIRIUS Motor Starter","metaDescription":"Siemens 3RA2120-0HD23-0BB4 SIRIUS non-fused motor starter, 180 W at 400 V, Class 10, 24 VDC coil, S0 frame. Active production, quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Motor Starters"],"specifications":{"Depth":"165 mm","Width":"45 mm","title":"3RA2120-0HD23-0BB4","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 0.55-0.8A 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 400 V rated value":"180 W","at 500 V rated value":"250 W","at 690 V rated value":"370 W","Design Of The Product":"direct starter","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":"3RV2011-0HA10","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":"0.6 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":"10.4 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":"0.55 ... 0.8 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/bd553f42faa31f0568d127894756c528.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=521492&mlfb=3RA2120-0HD23-0BB4"},"ai":{"faq":[{"question":"What is the depth of 3RA2120-0HD23-0BB4?","answer":"The depth is 165 mm, with a width of 45 mm and height of 260 mm. It mounts vertically on 60 mm busbar systems."},{"question":"What compliance documentation does Siemens provide for 3RA2120-0HD23-0BB4?","answer":"Pollution degree 3 is specified per IEC 60947-1."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RA2120-0HD23-0BB4","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/3RA2120-0HD23-0BB4 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}}