{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RA6120-2DB33","brand":"Siemens","brandSlug":"siemens","productSlug":"3RA6120-2DB33","canonicalUrl":"https://aoctrl.com/siemens/3RA6120-2DB33","factsUrl":"https://aoctrl.com/api/mcp/products/3RA6120-2DB33","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RA6120-2DB33 compact direct starter, 24 V DC/AC coil, 53 kA at 400 V, adjustable Trip Class 10/20, 5.5 kW at 400 V, 45 mm width, 191 mm height, 165 mm depth.","salesMarkdown":"## 53 kA interrupting capacity — what it means for panel coordination The 3RA6120-2DB33 is rated 53 kA at 400 V — this is the prospective short-circuit current it can safely interrupt at the main distribution level without upstream fuses or breakers needing to clear first. ## Trip Class 10 and 20 adjustable — setting the overload curve The overload relay is adjustable between Trip Class 10 and 20, letting you match the thermal memory to the motor start profile — Class 10 for fast-starting loads like pumps and fans, Class 20 for high-inertia loads like conveyors or crushers that need a longer acceleration ramp. This is a direct starter design rated for continuous operation per IEC 60947-6-2, so it is intended for across-the-line starting without a soft-start or VFD — the trip class setting is the only thermal tuning available. ## 24 V DC/AC coil — universal control voltage for global panels Coil holding power is 2.8 W AC maximum and 2.9 W DC maximum, which keeps the thermal load on the DIN-rail cluster low — relevant when multiple starters share a small enclosure without forced ventilation. ## DIN-rail footprint and mounting — 45 mm width, screw or snap-on Width is 45 mm, height 191 mm, depth 165 mm — the 45 mm width matches the standard 45 mm module pitch, so it occupies one position on a DIN rail and leaves room for adjacent devices without crowding. The main circuit connection is plug-in without terminals — the starter plugs into a separate terminal base, so you can pre-wire the panel and snap the starter in later without disturbing the power wiring. ## Environmental and mechanical endurance — shock, vibration, temperature Shock resistance is 60 m/s² (6g) with 10 ms pulses, three shocks per axis; vibration resistance covers 4 to 5.8 Hz at 15 mm amplitude and 5.8 to 500 Hz at 20 m/s² for 10 cycles — this starter is specified for machinery with moderate vibration, not for heavy mining shakers. Operating temperature range is -20 to +60 °C; storage and transport range is -55 to +80 °C — the -20 °C lower limit means it is not rated for freezer or arctic outdoor installation without a heated enclosure. Pollution degree 3 means it is suitable for industrial environments with conductive pollution or dry non-conductive pollution that becomes conductive due to condensation — typical for unsealed control panels in factory floors.","metaTitle":"Siemens 3RA6120-2DB33 SIRIUS Compact Starter, 24 V DC, 53 kA","metaDescription":"Siemens 3RA6120-2DB33 SIRIUS compact motor starter, 24 V DC/AC coil, 53 kA at 400 V, adjustable Trip Class 10/20. Active production, quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Motor Starters"],"specifications":{"Depth":"165 mm","Solid":"2x (0.25 ... 1.5 mm²)","Width":"45 mm","at DC":"24 ... 24 V","title":"3RA6120-2DB33","Height":"191 mm","at 400 V":"53 kA","at 50 Hz":"24 ... 24 V","at 60 Hz":"24 V","Trip Class":"CLASS 10 and 20 adjustable","Recommended":"vertical, on horizontal standard mounting rail","description":"SIRIUS Compact load feeder DOL starter 690 V 24 V AC/DC 50...60 Hz 3...12 A IP20 Connection main circuit: plug-in, without terminals Connection auxiliary circuit: Spring-type terminal","1 Rated Value":"50 Hz","2 Rated Value":"60 Hz","at AC maximum":"2.8 W","at DC maximum":"2.9 W","During Storage":"-55 ... +80 °C","number of LEDs":"2","Type Of Voltage":"AC/DC","lifecycle_stage":"current","During Operation":"-20 ... +60 °C","During Transport":"-55 ... +80 °C","Fastening Method":"screw and snap-on mounting","IO-Link protocol":"No","Shock Resistance":"a=60 m/s2 (6g) with 10 ms per 3 shocks in all axes","Mounting Position":"any","at DC rated value":"24 V","Product Brand Name":"SIRIUS","Type Of Assignment":"continous operation according to IEC 60947-6-2","Degree Of Pollution":"3","Product Designation":"compact starter","Vibration Resistance":"f= 4 ... 5.8 Hz, d= 15 mm; f= 5.8 ... 500 Hz, a= 20 m/s²; 10 cycles","at 400 V rated value":"5 500 W","at 480 V rated value":"12 A","at 50 Hz rated value":"24 V","at 500 V rated value":"3 kA","at 60 Hz rated value":"24 V","at 600 V rated value":"12 A","at 690 V rated value":"3 kA","AS-Interface protocol":"No","Design Of The Product":"direct starter","For Main Current Circuit":"plug-in without terminals","at 200/208 V rated value":"3 hp","at 220/230 V rated value":"3 hp","at 460/480 V rated value":"7.5 hp","at 575/600 V rated value":"10 hp","at AC at 400 V rated value":"12 A","NO-Load Switching Frequency":"3 600 1/h","Of The Main Contacts Typical":"10 000 000","at AC in hot operating state":"1.8 W","at AC-3 at 400 V rated value":"5.5 kW","Of Auxiliary Contacts Typical":"10 000 000","Substance Prohibitance (Date)":"05/01/2012","Insulation Voltage Rated Value":"690 V","at AWG cables for main contacts":"2x (16 ... 10), 1x 8","at DC-13 at 6 A at 24 V typical":"30 000","at AC-15 at 6 A at 230 V typical":"200 000","degree of protection NEMA rating":"other","For Auxiliary And Control Circuit":"spring-loaded terminals","Of The Signaling Contacts Typical":"10 000 000","Between Main And Auxiliary Circuit":"400 V","Design Of Short-Circuit Protection":"electromagnetic","Product Extension Auxiliary Switch":"Yes","Product Function Bus Communication":"No","Relative Humidity During Operation":"10 ... 90 %","Without Load Current Share Typical":"2.9 W","Surge Voltage Resistance Rated Value":"6 000 V","at AWG cables for auxiliary contacts":"2x (24 ... 16)","Between Control And Auxiliary Circuit":"300 V","at AC in hot operating state per pole":"0.6 W","Between Auxiliary And Auxiliary Circuit":"250 V","due to burst according to IEC 61000-4-4":"4 kV main contacts, 2 kV auxiliary contacts","reference code according to IEC 81346-2":"Q","Finely Stranded With Core End Processing":"2x (0.25 ... 1.5 mm²)","Number Of Poles For Main Current Circuit":"3","Formula For Making Capacity Limit Current":"12 x Ie","Product Function Short Circuit Protection":"Yes","Supply voltage required Auxiliary voltage":"No","with low demand rate according to SN 31920":"40 %","Finely Stranded Without Core End Processing":"2x (0.25 ... 1.5 mm²)","Formula For Breaking Capacity Limit Current":"10 x Ie","at AC-41 according to IEC 60947-6-2 maximum":"750 1/h","at AC-43 according to IEC 60947-6-2 maximum":"250 1/h","with high demand rate according to SN 31920":"50 %","number of NC contacts for auxiliary contacts":"1","number of NO contacts for auxiliary contacts":"1","operating voltage at AC-3 rated value maximum":"690 V","electrostatic discharge according to IEC 61000-4-2":"8 kV","contact rating of auxiliary contacts according to UL":"contacts 21-22, 13-14, 43-44 Q600 / A600, contacts 77-78 R300 / B300, contacts 95-96-98 R300 / D300","Product Component Removable Terminal For Main Circuit":"Yes","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","product function control circuit interface with IO link":"No","conducted HF interference emissions according to CISPR11":"150 kHz ... 30 MHz Class A","field-bound HF interference emission according to CISPR11":"30 ... 1000 MHz Class A","operational current of auxiliary contacts at AC-12 maximum":"10 A","For Short-Circuit Protection Of The Auxiliary Switch Required":"fuse gL/gG: 10 A","Product Function Control Circuit Interface To Parallel Wiring":"Yes","Product Component Removable Terminal For Auxiliary And Control Circuit":"Yes","Adjustable Current Response Value Current Of The Current-Dependent Overload Release":"3 ... 12 A","number of NO contacts of instantaneous short-circuit trip unit for signaling contact":"1","For Short-Circuit Protection Of The Signaling Switch Of The Overload Release Required":"4A gL/gG/400V","number of CO contacts of the current-dependent overload release for signaling contact":"1","For Short-Circuit Protection Of The Signaling Switch Of The Short-Circuit Release Required":"6A gL/gG/400V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$270.51","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/37ea407672e8607f700c40d71520f30a.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=126438&mlfb=3RA6120-2DB33"},"ai":{"faq":[{"question":"What is the interrupting capacity of 3RA6120-2DB33 at different voltages?","answer":"At 400 V it is rated 53 kA. The continuous current rating is 12 A at both 480 V and 600 V."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RA6120-2DB33","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/3RA6120-2DB33 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-22T19:47:38.189Z","lastPublished":"2026-07-22T19:47:38.189Z","indexable":true}}