{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RA2120-0JD23-0AK6","brand":"Siemens","brandSlug":"siemens","productSlug":"3RA2120-0JD23-0AK6","canonicalUrl":"https://aoctrl.com/siemens/3RA2120-0JD23-0AK6","factsUrl":"https://aoctrl.com/api/mcp/products/3RA2120-0JD23-0AK6","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RA2120-0JD23-0AK6 non-fused motor starter, direct starter design, S0 size, 250 W at 400 V, Class 10 thermal bimetallic overload, magnetic short-circuit trip, 690 V rated insulation, 45 mm width.","salesMarkdown":"## Active production — what that means for your BOM line The 3RA2120-0JD23-0AK6: The unit ships as a factory-assembled combination: the 3RT2023-1AK60 contactor, the 3RV2011-0JA10 circuit-breaker, the 3RA2921-1AA00 link module, and the 8US1251-5NT10 busbar adapter are all supplied on the same frame. ## Trip class and release design — the failure-mode read Class 10 trip curve means the overload relay must open within 10 seconds at 600 % of the set current — this is the standard for general-purpose motor starting where the acceleration time is under 10 seconds. The overload release is thermal bimetallic; the short-circuit trip is magnetic. That dual-release architecture means the bimetallic element handles sustained overcurrents while the magnetic coil catches bolted faults — no electronic board to fail in high-vibration or high-ambient panel environments. ## Power ratings across voltage taps Rated power is 250 W at 400 V, 370 W at 500 V, and 550 W at 690 V — the current draw scales inversely with voltage, so the same contactor and overload block handle the full range without re-sizing the thermal element. At 575/600 V the rating is 0.5 hp — a common figure for North American 600 V class panels where the motor nameplate is in horsepower. Operating frequency is 50... 60 Hz, so the starter is electrically identical for 50 Hz and 60 Hz line supplies — no de-rating needed when crossing between the two. ## Mounting and panel integration Fastening method is for snapping onto 60 mm busbar systems — the S0 frame clips directly onto the busbar without a separate mounting plate, saving a row of DIN rail in a dense panel. Mounting position is vertical only — the bimetallic overload relies on natural convection for the trip curve; horizontal mounting shifts the thermal profile and voids the Class 10 guarantee. Dimensions: 45 mm wide, 260 mm high, 155 mm deep. Clearance requirements: 30 mm upwards, 10 mm forwards, 10 mm downwards, 9 mm at the side, 0 mm backwards. The zero backward clearance means the back of the unit can sit flush against the panel backplate. ## Environmental limits and wire sizing Operating temperature range is -20... +60 °C — suitable for most indoor industrial enclosures without forced cooling; storage range is -50... +80 °C, transport range -55... +80 °C. Main contact wire range: stranded 1... 10 mm², or 2x (2.5... 6 mm²); AWG equivalent 2x (16... 12), 2x (14... 8). The dual-conductor entry allows looping through the starter without a separate terminal block for the line side. Degree of pollution 3 — the starter is rated for conductive pollution environments typical of industrial control panels where humidity, dust, or airborne contaminants are present.","metaTitle":"Siemens 3RA2120-0JD23-0AK6 SIRIUS Motor Starter","metaDescription":"Siemens 3RA2120-0JD23-0AK6 SIRIUS non-fused motor starter, 250 W rated power at 400 V, Class 10 thermal overload, S0 size. Active production, quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Motor Starters"],"specifications":{"Depth":"155 mm","Width":"45 mm","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":"690 V","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":"250 W","at 50 Hz rated value":"88 ... 121 V","at 500 V rated value":"370 W","at 60 Hz rated value":"96 ... 132 V","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":"3RT2023-1AK60","For Main Contacts Stranded":"1 ... 10 mm², 2x (2.5 ... 6 mm²)","Of The Supplied Link Module":"3RA2921-1AA00","Size Of The Circuit-Breaker":"S00","at AC-3 rated value maximum":"690 V","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":"3RV2011-0JA10","Product Extension Auxiliary Switch":"Yes","Surge Voltage Resistance Rated Value":"6 kV","Number Of Poles For Main Current Circuit":"3","Product Function Short Circuit Protection":"Yes","apparent holding power of magnet coil at AC":"7.2 VA","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","Inductive Power Factor With The Holding Power Of The Coil":"0.28","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/12e3e27b1249f65bf8ba9c38e3365baa.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=9725&mlfb=3RA2120-0JD23-0AK6","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RA2120-0JD23-0AK6/alternatives.json"},"ai":{"faq":[{"question":"What compliance documentation does Siemens provide for 3RA2120-0JD23-0AK6?","answer":"The unit carries a 690 V rated insulation voltage and is designed for pollution degree 3. Standard Siemens documentation includes the declaration of conformity for IEC/EN 60947-4-1, RoHS, and REACH. The supplied components (contactor, circuit-breaker, link module, busbar adapter) each carry their own CE and UKCA markings as part of the SIRIUS system."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RA2120-0JD23-0AK6","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/3RA2120-0JD23-0AK6 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}}