{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV2901-2B","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV2901-2B","canonicalUrl":"https://aoctrl.com/siemens/3RV2901-2B","factsUrl":"https://aoctrl.com/api/mcp/products/3RV2901-2B","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RV2901-2B, lateral auxiliary switch, 2 NO, spring-loaded terminals, for 3RV2 circuit breakers sizes S00, S0, S2, S3, 9.5 mm width.","salesMarkdown":"The Siemens SIRIUS 3RV2901-2B is a lateral auxiliary switch designed to snap onto 3RV2 circuit breakers in sizes S00, S0, S2, and S3. It provides two normally open (NO) instantaneous contacts via spring-loaded terminals, eliminating the need for screwdriver torque control during panel wiring. The 9.5 mm width keeps the assembly compact on the DIN rail, and the plug-in fixing method means it mounts directly onto the breaker side without additional hardware. The 3RV2901-2B carries rated operational currents across multiple voltage levels: 2 A at 24 V, 0.5 A at 110 V, 0.25 A at 220 V, 4 A at 230 V, 0.25 A at 250 V, 3 A at 400 V, and 10 A at 690 V. These figures cover control-circuit switching for most industrial AC voltages encountered in panel applications. For AC-15 duty (solenoid and electromagnetic loads), the switch is rated 1 A at 690 V. The maximum AC-12 (resistive load) current is 10 A. These ratings define the load type the contacts can reliably break — AC-15 is the relevant one for contactor coils and relay loads. Wire termination uses spring-loaded terminals accepting 0.5 to 2.5 mm² solid or stranded conductors, or 2x (0.5 to 2.5 mm²) solid. For AWG, this corresponds to 20 to 14 gauge. The switch occupies 9.5 mm of DIN-rail width and stands 90 mm tall with a 68 mm depth. It is designed to be mounted on the side of the circuit breaker, so it does not consume additional rail space beyond the breaker footprint. The substance prohibition date of October 1, 2009 indicates RoHS compliance per EU Directive 2002/95/EC.","metaTitle":"Siemens 3RV2901-2B SIRIUS Auxiliary Switch, 2 NO, 9.5 mm","metaDescription":"Siemens SIRIUS 3RV2901-2B lateral auxiliary switch, 2 NO, spring-loaded terminals, 9.5 mm wide, for 3RV2 breakers sizes S00-S3. Active production.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Motor Protection Circuit Breakers (MPCB)"],"specifications":{"Depth":"68 mm","Solid":"2x (0.5 ... 2.5 mm²)","Width":"9.5 mm","title":"3RV2901-2B","Height":"90 mm","at 24 V":"2 A","at 110 V":"0.5 A","at 220 V":"0.25 A","at 230 V":"4 A","at 250 V":"0.25 A","at 400 V":"3 A","at 690 V":"10 A","description":"Auxiliary switch can be mounted on the side 2 NO spring-type terminal for circuit breaker 3RV2","During Storage":"-50 ... +80 °C","lifecycle_stage":"current","During Operation":"-20 ... +60 °C","Fastening Method":"plug-in fixing","Solid Or Stranded":"0.5 ... 2.5 mm²","Product Brand Name":"SIRIUS","Product Designation":"auxiliary switch, lateral","Design Of The Product":"lateral auxiliary switches","Size Of The Circuit-Breaker":"S00, S0, S2, S3","Substance Prohibitance (Date)":"10/01/2009","for AWG cables for auxiliary contacts":"2x (20 ... 14)","Finely Stranded With Core End Processing":"2x (0.5 ... 1.5 mm²)","Finely Stranded Without Core End Processing":"2x (0.5 ... 1.5 mm²)","operational current at AC-15 at 690 V rated value":"1 A","operational current of auxiliary contacts at AC-12 maximum":"10 A","Type Of Electrical Connection For Auxiliary And Control Circuit":"spring-loaded terminals","number of CO contacts of auxiliary contacts instantaneous contact":"0","number of NC contacts for auxiliary contacts instantaneous contact":"0","number of NO contacts for auxiliary contacts instantaneous contact":"2","AWG number as coded connectable conductor cross section for auxiliary contacts":"20 ... 14"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$5.26","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/343fd201fe62b1ff4cf80ba57c9dc3d9.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=350498&mlfb=3RV2901-2B"},"ai":{"faq":[{"question":"What is the closest functional second-source for 3RV2901-2B?","answer":"There is no direct drop-in replacement from another manufacturer. Within the Siemens SIRIUS family, the 3RV2011-0BA20 is a motor-protective circuit breaker that uses the same 3RV2 platform and shares the auxiliary-switch mounting interface, but it is a main breaker (45 mm wide, screw/snap-on DIN mount) rather than a lateral switch. The 3RV2901-2B is the dedicated auxiliary switch for the 3RV2 family."},{"question":"What is the depth of 3RV2901-2B?","answer":"The depth is 68 mm."},{"question":"What wire sizes does the 3RV2901-2B accept?","answer":"Solid conductors: 2x (0.5 to 2.5 mm²). Finely stranded with or without core-end processing: 2x (0.5 to 1.5 mm²). AWG equivalent: 20 to 14."},{"question":"What compliance documentation does Siemens provide for 3RV2901-2B?","answer":"The part carries a substance prohibition date of October 1, 2009, indicating RoHS compliance with EU Directive 2002/95/EC. Standard Siemens SIRIUS documentation includes CE declaration of conformity and UL/CSA file numbers available through the Siemens Industry Online Support portal."},{"question":"Where can I buy 3RV2901-2B and get a price?","answer":"This part is sourced and quoted 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."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV2901-2B","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/3RV2901-2B when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}