{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RA6120-1BB34","brand":"Siemens","brandSlug":"siemens","productSlug":"3RA6120-1BB34","canonicalUrl":"https://aoctrl.com/siemens/3RA6120-1BB34","factsUrl":"https://aoctrl.com/api/mcp/products/3RA6120-1BB34","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RA6120-1BB34 compact motor starter, direct starter design, 53 kA breaking capacity at 400 V, adjustable trip class 10/20, 24 V AC/DC control, screw-type terminals, DIN rail mount.","salesMarkdown":"## 53 kA at 400 V — what it means for your panel The 3RA6120-1BB34 carries a short-circuit breaking capacity of 53 kA at 400 V AC. The trip class is adjustable between CLASS 10 and CLASS 20. CLASS 20 gives more ride-through for high-inertia loads like fans or centrifuges. The adjustment is on the overload relay itself; no separate module needed. ## Control voltage and wiring — 24 V AC/DC, universal The control coil accepts 24 V AC at 50 Hz, 24 V at 60 Hz, and 24 V DC — the type of voltage is AC/DC, so a single part covers both a 24 VDC PLC output and a 24 VAC control transformer. No need to stock separate AC and DC coil variants. Power dissipation is 2.8 W at AC maximum and 2.9 W at DC maximum. In a densely packed panel with multiple starters running continuously, that heat adds up — budget the thermal load into the enclosure's ventilation or forced-air cooling. The dual-conductor rating is useful for daisy-chaining the supply through the starter without a separate terminal block. ## Mechanical fit — DIN rail, 45 mm wide, any orientation The starter is 45 mm wide, 170 mm tall, and 165 mm deep — a standard 45 mm module width that fits on a DIN rail with snap-on mounting. The depth of 165 mm means it will clear most 200 mm deep enclosures, but check the gland plate clearance if the panel is shallow. Mounting position is any, though the recommended orientation is vertical on a horizontal standard mounting rail. The vibration resistance is tested to 4–5.8 Hz at 15 mm displacement and 5.8–500 Hz at 20 m/s², and shock resistance is 60 m/s² (6g) for 10 ms — suitable for machine-mounted applications with moderate vibration. ## Environmental and compliance — pollution degree 3, wide temperature range The degree of pollution is 3, meaning the starter is rated for conductive pollution or dry non-conductive pollution that becomes conductive due to condensation — typical for industrial control panels not in a clean-room environment. Operating temperature range is -20 to +60 °C, storage and transport range is -55 to +80 °C. Two LED indicators are present for status — typically power on and trip/fault indication. No IO-Link or AS-Interface protocol support; this is a conventional hardwired starter.","metaTitle":"Siemens 3RA6120-1BB34 SIRIUS Compact Starter, 53 kA at 400 V","metaDescription":"Siemens 3RA6120-1BB34 SIRIUS compact motor starter, direct starter design, 53 kA breaking capacity at 400 V, adjustable trip class 10/20, 24 V AC/DC control.","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":"3RA6120-1BB34","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 mounting rail","description":"SIRIUS Compact load feeder DOL starter 690 V 24 V AC/DC 50...60 Hz 0.32...1.25 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":"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":"370 W","at 480 V rated value":"1.25 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":"1.25 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 460/480 V rated value":"0.5 hp","at 575/600 V rated value":"0.5 hp","at AC at 400 V rated value":"1.25 A","NO-Load Switching Frequency":"3 600 1/h","Of The Main Contacts Typical":"10 000 000","at AC in hot operating state":"0.1 W","at AC-3 at 400 V rated value":"0.37 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":"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":"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":"0.03 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":"38.4 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 Breaking Capacity Limit Current":"32 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":"0.32 ... 1.25 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/f29ff65fc7792b824a5449823e39770e.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=290465&mlfb=3RA6120-1BB34"},"ai":{"faq":[{"question":"What is the short-circuit breaking capacity of the 3RA6120-1BB34 at 400 V?","answer":"The 3RA6120-1BB34 has a short-circuit breaking capacity of 53 kA at 400 V AC."},{"question":"What control voltage does the 3RA6120-1BB34 accept?","answer":"The control coil accepts 24 V AC at 50 Hz, 24 V at 60 Hz, and 24 V DC. The type of voltage is AC/DC, so it works with both AC and DC control circuits."},{"question":"How do I order the 3RA6120-1BB34 and get a price?","answer":"The 3RA6120-1BB34 is sourced through independent distribution channels."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RA6120-1BB34","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/3RA6120-1BB34 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}}