{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RA6250-2BB33","brand":"Siemens","brandSlug":"siemens","productSlug":"3RA6250-2BB33","canonicalUrl":"https://aoctrl.com/siemens/3RA6250-2BB33","factsUrl":"https://aoctrl.com/api/mcp/products/3RA6250-2BB33","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RA6250-2BB33 compact reversing starter, 370 W at 400 V, 53 kA rated short-circuit current at 400 V, CLASS 10 and 20 adjustable trip class, 24 V AC/DC control voltage, screw and snap-on mounting.","salesMarkdown":"## Active production — what that means for your BOM line The 3RA6250-2BB33: This is a SIRIUS compact reversing starter — a single device that combines a contactor, overload relay, and reversing interlock in one 90 mm wide housing. Rated 370 W at 400 V, it handles small reversing motor loads — conveyors, gate drives, valve actuators — where panel space is tight and the reversing function is built in, not wired externally. ## 53 kA SCCR at 400 V — the so-what for panel coordination The 53 kA rated short-circuit current at 400 V means this starter can be installed on a supply with up to 53 kA prospective fault current without needing a current-limiting upstream breaker to protect it. For a panel builder, that simplifies the selectivity study — the starter is self-protecting at that fault level, so the upstream MCCB or fuse only needs to coordinate for discrimination, not for the starter's survival. The adjustable trip class (CLASS 10 and 20,) lets you match the thermal memory to the motor's acceleration profile. CLASS 10 for fast-starting loads (pumps, small fans), CLASS 20 for high-inertia loads (centrifuges, flywheels) that need a longer start duration without nuisance tripping. This is set via a dial on the overload block — no module swap required. The 90 mm width and 191 mm height mean it occupies roughly the footprint of two standard contactors side by side — but with the reversing interlock integrated, you save the wiring and the interlock hardware. Depth is 165 mm, which fits standard 200 mm deep enclosures with room for the outgoing cable bend radius. For the main power circuit, the plug-in terminal system means the power block is pre-wired to the panel and the control module snaps on separately, reducing wiring errors on repeat builds. ## Environmental and mechanical endurance That covers most indoor industrial environments without derating — the limiting factor is the ambient heat inside the enclosure, not the starter itself. Shock resistance is 60 m/s² (6g) for 10 ms per 3 shocks in all axes, and vibration resistance follows a 4–5.8 Hz / 15 mm displacement and 5.8–500 Hz / 20 m/s² profile for 10 cycles. This is sufficient for machine-mounted applications on presses, conveyors, and packaging equipment — not just panel-mounted in a fixed electrical room.","metaTitle":"Siemens 3RA6250-2BB33 SIRIUS Reversing Starter","metaDescription":"Siemens 3RA6250-2BB33 SIRIUS compact reversing starter, 370 W at 400 V, 53 kA SCCR, CLASS 10/20 adjustable trip. Active production, quoted to order.","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":"90 mm","at DC":"24 ... 24 V","title":"3RA6250-2BB33","Height":"191 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 0.32...1.25 A IP20 Connection main circuit: plug-in, without terminals Connection control circuit: Spring-type 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":"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":"reversing starter","For Main Current Circuit":"plug-in without 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":"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":"2.9 W","Surge Voltage Resistance Rated Value":"6 000 V","at AWG cables for auxiliary contacts":"2x (24 ... 16)","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":"2x (0.25 ... 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 %","Finely Stranded Without Core End Processing":"2x (0.25 ... 1.5 mm²)","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":"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":"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":"$411.48","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/0fb7687ccaa697301f62b37d45fe820c.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=311012&mlfb=3RA6250-2BB33"},"ai":{"faq":[{"question":"What is the 3RA6250-2BB33's depth?","answer":"The depth is 165 mm. This is the dimension from the DIN-rail mounting surface to the front of the device, including the control module. Allow additional clearance for cable bending radius and auxiliary contact blocks if fitted."},{"question":"What compliance documentation does Siemens provide for 3RA6250-2BB33?","answer":"As a current-production SIRIUS device, the 3RA6250-2BB33 ships with RoHS, REACH, and CE declarations. UL and IEC 60947-6-2 certification applies to the series. The specific certificate numbers and declaration of conformity are available from Siemens Industry Online Support or upon request with the RFQ."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RA6250-2BB33","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/3RA6250-2BB33 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}}