{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RA6250-1CB33","brand":"Siemens","brandSlug":"siemens","productSlug":"3RA6250-1CB33","canonicalUrl":"https://aoctrl.com/siemens/3RA6250-1CB33","factsUrl":"https://aoctrl.com/api/mcp/products/3RA6250-1CB33","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS reversing starter, 3RA6250-1CB33, 24 V AC/DC control, adjustable Trip Class 10/20, 53 kA breaking capacity at 400 V, screw and snap-on mounting.","salesMarkdown":"## What this reversing starter is built for The Siemens 3RA6250-1CB33 is a SIRIUS compact reversing starter — two contactors mechanically interlocked in one package, with an integrated overload relay. It handles forward/reverse motor control in a single 90 mm wide unit, saving panel space over two separate contactors plus a mechanical interlock. Control voltage is 24 V AC/DC, so it works off a standard 24 VDC control supply or a 24 VAC transformer without rewiring. The coil holds at 24 V nominal; verify the dropout threshold against your PLC output card's low-side capability. The overload relay offers adjustable Trip Class 10 and 20 — set Class 10 for standard motor protection on conveyors and pumps, Class 20 for high-inertia loads like fans or centrifuges that need a longer start curve before tripping. ## Breaking capacity and fault coordination For a panel fed by a transformer with 50 kA available fault current, this unit provides adequate SCCR headroom without an upstream current-limiting fuse. The 1 500 W rated power at 400 V and 4 A at 480 V / 600 V set the motor-size ceiling. For a 1.5 kW reversing application on 400 V three-phase, this is a direct fit. ## Mounting and wiring in the panel The 90×170×165 mm footprint (W×H×D) fits a standard distribution board depth. Wiring terminals accept solid conductors from 0.5 to 4 mm², or two conductors 0.5 to 2.5 mm² per clamp — enough for a 4 mm² motor supply cable and a 1.5 mm² control loop in the same terminal. The plug-in main current circuit speeds replacement: pull the main plug, swap the unit, reinsert. The 60 °C upper operating limit means it can sit next to a drive or transformer inside a sealed enclosure without derating, provided the enclosure's internal temperature stays below that ceiling.","metaTitle":"Siemens 3RA6250-1CB33 SIRIUS Reversing Starter, 24V AC/DC","metaDescription":"Siemens 3RA6250-1CB33 SIRIUS reversing starter, 24V AC/DC control, adjustable trip class 10/20, 53 kA breaking capacity at 400V. 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":"90 mm","at DC":"24 ... 24 V","title":"3RA6250-1CB33","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 Reversing starter 690 V 24 V AC/DC 50...60 Hz 1...4 A IP20 Connection main circuit: plug-in, without terminals Connection control circuit: screw 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":"3","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":"1 500 W","at 480 V rated value":"4 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":"4 A","at 690 V rated value":"3 kA","AS-Interface protocol":"No","Design Of The Product":"reversing 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 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":"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":"0.33 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 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":"0","number of NO contacts for auxiliary contacts":"2","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":"$438.15","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/fe1be6360cf649d7d3d678582aef0743.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=272694&mlfb=3RA6250-1CB33"},"ai":{"faq":[{"question":"Is 3RA6250-1CB33 a reversing starter suitable for 24V DC?","answer":"Yes. The 3RA6250-1CB33 is a reversing starter with 24 V AC/DC control voltage, meaning it operates on a 24 VDC control supply without any modification."},{"question":"Does 3RA6250-1CB33 have an adjustable trip class?","answer":"Yes, the overload relay is adjustable between Trip Class 10 and Trip Class 20, selectable via a dial on the unit."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RA6250-1CB33","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/3RA6250-1CB33 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}}