{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RA6120-2CP33","brand":"Siemens","brandSlug":"siemens","productSlug":"3RA6120-2CP33","canonicalUrl":"https://aoctrl.com/siemens/3RA6120-2CP33","factsUrl":"https://aoctrl.com/api/mcp/products/3RA6120-2CP33","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RA6120-2CP33 compact direct starter, 53 kA at 400 V, adjustable Class 10/20, 110-240 V AC/DC, 45 mm wide, screw and snap-on DIN rail.","salesMarkdown":"## SIRIUS compact starter — 53 kA breaking capacity, adjustable trip class The Siemens 3RA6120-2CP33 is a SIRIUS compact direct starter designed for continuous motor duty per IEC 60947-6-2. The adjustable trip class (Class 10 or 20) lets you match the overload protection to the motor start profile — Class 10 for fast-starting pumps and fans, Class 20 for high-inertia loads like conveyors or centrifuges. That flexibility is the main reason this starter replaces separate overload relay swaps in the panel. ## Panel fit and wiring — 45 mm wide, 191 mm tall At 45 mm wide, 191 mm tall, and 165 mm deep, this starter occupies a single 45 mm DIN rail slot — the same footprint as a standard contactor-plus-overload pair, but pre-integrated. The main circuit connects via plug-in terminals (no screw terminals on the power side), which speeds replacement: pull the old unit, snap in the new one, re-terminate the control wires. Solid wire capacity is 2x (0.25 to 1.5 mm²) on the control terminals. That's enough for standard 1.0 mm² or 1.5 mm² control wiring; if your panel uses 2.5 mm² for long runs, you'll need a ferrule or a terminal adapter. Mounting position is any orientation, though vertical on horizontal DIN rail is recommended. The shock rating of 60 m/s² (6g) for 10 ms across all axes and the vibration spec (15 mm displacement at 4–5.8 Hz, 20 m/s² acceleration at 5.8–500 Hz) mean it holds up in pump skids and conveyor sections without additional bracketing. ## Control voltage and coil power — universal AC/DC, low standby draw This simplifies stocking — one part number covers both 120 V and 240 V control systems common in North American and European panels. Coil power consumption is 6 W AC maximum and 5.1 W DC maximum. That's low enough to daisy-chain several starters on a single 24 VDC power supply without exceeding the supply's rating, though the coil is 110–240 V, not 24 V — plan your control transformer accordingly. Two onboard LEDs indicate coil status and trip condition — useful for quick fault isolation on the line without a meter. ## Environmental range and compliance Operating temperature spans -20 to +60 °C, storage and transport from -55 to +80 °C. Pollution degree 3 means it tolerates conductive dust and humidity typical of industrial enclosures without conformal coating.","metaTitle":"Siemens 3RA6120-2CP33 SIRIUS Compact Starter, 53 kA at 400 V","metaDescription":"Siemens SIRIUS 3RA6120-2CP33 compact direct starter, 53 kA breaking capacity at 400 V, adjustable Class 10/20, 110-240 V AC/DC coil.","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":"110 ... 240 V","title":"3RA6120-2CP33","Height":"191 mm","at 400 V":"53 kA","at 50 Hz":"110 ... 240 V","at 60 Hz":"110 ... 240 V","Trip Class":"CLASS 10 and 20 adjustable","Recommended":"vertical, on horizontal standard DIN rail","description":"SIRIUS Compact load feeder DOL starter 690 V 110...240 V AC/DC 50...60 Hz 1...4 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":"6 W","at DC maximum":"5.1 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":"240 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":"1 500 W","at 480 V rated value":"4 A","at 50 Hz rated value":"240 V","at 500 V rated value":"3 kA","at 600 V rated value":"4 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":"0.75 hp","at 220/230 V rated value":"0.75 hp","at 460/480 V rated value":"2 hp","at 575/600 V rated value":"3 hp","at AC at 400 V rated value":"4 A","NO-Load Switching Frequency":"3 600 1/h","Of The Main Contacts Typical":"10 000 000","at AC in hot operating state":"1 W","at AC-3 at 400 V rated value":"1.5 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":"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":"6 W","Surge Voltage Resistance Rated Value":"6 000 V","Between Control And Auxiliary Circuit":"300 V","at AC in hot operating state per pole":"0.33 W","for AWG cables for auxiliary contacts":"2x (24 ... 16)","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 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":"1 ... 4 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":"$255.27","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/468807256a7e05d8e4d3723b57c7b778.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=169446&mlfb=3RA6120-2CP33"},"ai":{"faq":[{"question":"What is the breaking capacity of 3RA6120-2CP33 at 400 V?","answer":"53 kA at 400 V. That rating means it safely interrupts fault currents up to 53,000 A at 400 V without upstream fuses or a larger breaker — sufficient for most industrial panelboards fed from a 1,000 kVA transformer."},{"question":"What motor power does 3RA6120-2CP33 handle at 400 V?","answer":"Rated for 1,500 W (2 hp) at 400 V in continuous duty. At 200/208 V it's rated 0.75 hp. The adjustable trip class (10 or 20) lets you tune the overload curve to the motor's starting characteristics."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RA6120-2CP33","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/3RA6120-2CP33 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}}