{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RA6120-1DB32","brand":"Siemens","brandSlug":"siemens","productSlug":"3RA6120-1DB32","canonicalUrl":"https://aoctrl.com/siemens/3RA6120-1DB32","factsUrl":"https://aoctrl.com/api/mcp/products/3RA6120-1DB32","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS compact starter, 3RA6120-1DB32, direct starter, 24 V DC coil, 53 kA at 400 V, adjustable Trip Class 10/20, screw terminals.","salesMarkdown":"The Siemens SIRIUS 3RA6120-1DB32 is a compact starter — a direct-on-line motor starter that packs the contactor and overload relay into a single 45 mm wide unit. It's sized for continuous operation per IEC 60947-6-2, meaning it's built for sustained motor duty, not just occasional jogging. The screw-type terminals on the main circuit accept solid conductors from 0.5 to 4 mm², or two conductors up to 2.5 mm² each, which covers the common motor feed sizes for fractional through moderate-horsepower motors. The headline number is the breaking capacity: 53 kA at 400 V. At 480 V it's rated 12 A continuous, and at 600 V also 12 A, so it's sized for motors in the 5.5 kW range on a 400 V line. The overload relay is adjustable between Trip Class 10 and 20. Class 20 gives you 20 seconds, which handles high-inertia loads like centrifuges or crushers that take longer to spin up. You dial it in on the front without swapping heaters. Coil voltage is 24 V DC, drawing about 2.8 W AC or 2.9 W DC. That's a standard PLC-level control voltage — no need for a separate 110 V control transformer in the panel. Two LEDs on the front give you local status: one for the coil energized, one for the overload tripped. No IO-Link or AS-Interface onboard — this is a plain-vanilla hardwired starter. ## Environmental toughness for the plant floor It'll survive a hot motor control center in summer and a cold warehouse in winter. Shock-rated to 60 m/s² (6 g) for 10 ms, three shocks per axis, and vibration tested to 20 m/s² from 5.8 to 500 Hz. That's enough for most industrial environments — conveyors, pumps, compressors — without nuisance trips from mechanical vibration. Pollution degree 3, so it's rated for conductive dust and occasional condensation — typical for an unsealed panel in a factory or warehouse. Not for washdown zones; that's what the IP65-enclosed SIRIUS variants are for.","metaTitle":"Siemens 3RA6120-1DB32 SIRIUS Compact Starter, 53 kA at 400 V","metaDescription":"Siemens SIRIUS 3RA6120-1DB32 compact starter, 53 kA breaking capacity at 400 V, adjustable Trip Class 10/20, 24 V DC coil. Sourced to order against RFQ.","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","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","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":"screw-type 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 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":"screw-type 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 (20 ... 14)","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":"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":"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":"$432.94 – $702.92","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=32847&mlfb=3RA6120-1DB32","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RA6120-1DB32/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RA6120-1DB32 and get a price?","answer":"The 3RA6120-1DB32 is sourced to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm price and lead time."},{"question":"What is the breaking capacity of 3RA6120-1DB32?","answer":"It's rated 53 kA at 400 V, 3 kA at 500 V, and 3 kA at 690 V. That 53 kA figure means it can safely interrupt a fault current of that magnitude without upstream fuses in most panels."},{"question":"What wire sizes does the 3RA6120-1DB32 accept?","answer":"The screw terminals accept solid conductors from 0.5 to 4 mm², or two conductors each from 0.5 to 2.5 mm². That covers standard motor feeds up to about 4 mm²."},{"question":"What is the difference between 3RA6120-1DB32 and 3RT6028-1AB00?","answer":"The 3RT6028-1AB00 is a bare contactor without an integrated overload relay. The 3RA6120-1DB32 is a compact starter that combines the contactor and overload in one 45 mm housing. If your panel was wired for the 3RT6028 with a separate overload, dropping in the 3RA6120 would require rewiring the motor circuit — the footprint is similar but the wiring topology is different."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RA6120-1DB32","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/3RA6120-1DB32 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}}