{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RA6120-1EB34","brand":"Siemens","brandSlug":"siemens","productSlug":"3RA6120-1EB34","canonicalUrl":"https://aoctrl.com/siemens/3RA6120-1EB34","factsUrl":"https://aoctrl.com/api/mcp/products/3RA6120-1EB34","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS compact starter, direct starter, 3RA6120-1EB34, 24 V AC/DC coil, adjustable trip class 10/20, 53 kA breaking capacity at 400 V, screw terminals, DIN-rail mount.","salesMarkdown":"## What this compact starter is and why the trip class matters The Siemens 3RA6120-1EB34 is a SIRIUS compact starter — a direct-on-line (DOL) starter that combines a contactor and overload relay in a single 45 mm wide housing. The trip class is adjustable between CLASS 10 and CLASS 20, which means you can match the thermal overload curve to the motor start profile. CLASS 10 trips faster — suited for short acceleration times like pumps or fans — while CLASS 20 allows longer inrush for high-inertia loads such as conveyors or centrifuges. Getting this wrong on a DOL starter causes nuisance tripping or missed protection. ## Coil voltage and control wiring The coil is rated 24 V AC/DC, 50/60 Hz, drawing 3.5 W AC maximum or 3.1 W DC maximum. That means a single 24 V supply — either a control transformer or a DC power supply — runs the starter, and the power draw is low enough that multiple units can share a small supply without oversizing. Screw-type terminals on the main circuit accept solid conductors from 0.5 to 4 mm², and two conductors per clamp (0.5 to 2.5 mm²) are allowed for daisy-chaining control wiring. This is a standard panel-building detail: the terminal capacity matches typical motor-circuit wire sizes up to 4 mm², so no adapter or ferrule change is needed. ## Environmental and mounting notes Mounting position is any orientation, though the recommended installation is vertical on a horizontal DIN rail.","metaTitle":"Siemens 3RA6120-1EB34 SIRIUS Compact Starter, 53 kA","metaDescription":"Siemens 3RA6120-1EB34 SIRIUS compact starter, direct starter design, 53 kA breaking capacity at 400 V, adjustable trip class 10/20.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Motor Starters"],"specifications":{"Depth":"165 mm","Solid":"0.5 ... 4 mm², 2x (0.5 ... 2.5 mm²)","Width":"45 mm","at DC":"24 ... 24 V","title":"3RA6120-1EB34","Height":"170 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 DIN rail","description":"SIRIUS Compact load feeder DOL starter 690 V 24 V AC/DC 50...60 Hz 8...32 A IP20 Connection main circuit: screw terminal Connection auxiliary circuit: plug-in, without terminals","1 Rated Value":"50 Hz","2 Rated Value":"60 Hz","at AC maximum":"3.5 W","at DC maximum":"3.1 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":"15 000 W","at 480 V rated value":"32 A","at 50 Hz rated value":"24 V","at 500 V rated value":"1 kA","at 60 Hz rated value":"24 V","at 690 V rated value":"1 kA","AS-Interface protocol":"No","Design Of The Product":"direct starter","For Main Current Circuit":"screw-type terminals","at 200/208 V rated value":"7.5 hp","at 220/230 V rated value":"10 hp","at 460/480 V rated value":"20 hp","at AC at 400 V rated value":"32 A","NO-Load Switching Frequency":"3 600 1/h","Of The Main Contacts Typical":"10 000 000","at AC in hot operating state":"5.4 W","at AC-3 at 400 V rated value":"15 kW","Of Auxiliary Contacts Typical":"10 000 000","Substance Prohibitance (Date)":"05/01/2012","Insulation Voltage Rated Value":"690 V","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":"plug-in without 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":"3.5 W","Surge Voltage Resistance Rated Value":"6 000 V","at AWG cables for auxiliary contacts":"2x (20 ... 14)","Between Control And Auxiliary Circuit":"300 V","at AC in hot operating state per pole":"1.8 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":"0.5 ... 2.5 mm², 2x (0.5 ... 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 %","Formula For Limit Current Breaking Capacity":"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":"8 ... 32 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":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/c44d5baa74571258553e8b27b170839a.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=193197&mlfb=3RA6120-1EB34"},"ai":{"faq":[{"question":"Is 3RA6120-1EB34 a DOL starter?","answer":"Yes, the Siemens 3RA6120-1EB34 is a direct-on-line (DOL) starter — the product designation is compact starter and the design is direct starter, meaning it connects the motor directly to the supply without reduced-voltage starting."},{"question":"What is the trip class of 3RA6120-1EB34?","answer":"The trip class is adjustable between CLASS 10 and CLASS 20, so you can set the overload protection curve to match the motor start duration."},{"question":"Where can I buy Siemens 3RA6120-1EB34?","answer":"This part is sourced to order against an RFQ through independent distribution channels. Submit an RFQ to confirm current pricing and availability."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RA6120-1EB34","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/3RA6120-1EB34 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}}