{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV1901-2E","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV1901-2E","canonicalUrl":"https://aoctrl.com/siemens/3RV1901-2E","factsUrl":"https://aoctrl.com/api/mcp/products/3RV1901-2E","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS transverse auxiliary switch, 3RV1901-2E, 1 NO + 1 NC, spring-loaded terminals, for circuit breaker sizes S00, S0, S2, S3.","salesMarkdown":"The Siemens 3RV1901-2E is a SIRIUS transverse auxiliary switch designed to mount on the front of SIRIUS 3RV circuit breakers in sizes S00, S0, S2, and S3. It provides one normally-open and one normally-closed instantaneous contact, wired through spring-loaded terminals that accept 2x (0.5... 2.5 mm²) solid or stranded wire, or 2x (20... 14) AWG. ## Switching Capacity and Terminal Ratings The auxiliary contacts are rated for 1 A at 24 V, 0.3 A at 48 V, 0.15 A at 60 V, and 0.5 A at 230 V. The AC-12 maximum operational current is 2.5 A. These ratings define the signal-level switching capability — enough for PLC inputs, contactor coils, and indicator lamps, but not for power circuits. Spring-loaded terminals accept solid or stranded conductors from 0.5 mm² to 2.5 mm² (2x per clamp), and finely stranded wire with or without end processing from 0.5 mm² to 1.5 mm². AWG range is 20 to 14 for auxiliary circuits. No screwdriver needed; strip to the correct length and push in. ## Mounting and Environmental Range The switch uses plug-in fixing onto the front of compatible SIRIUS 3RV breakers — no DIN rail required for the switch itself. The 3RV1901-2E is a phased-out product. The official Siemens successor is the SIRIUS 3RV2901-2E, which uses the same contact configuration and spring-terminal design. For new builds or BOM updates, the 3RV2901-2E is the preferred direct replacement.","metaTitle":"Siemens 3RV1901-2E SIRIUS Auxiliary Switch, 1 NO+1 NC, Sprin","metaDescription":"Siemens 3RV1901-2E SIRIUS transverse auxiliary switch, 1 NO+1 NC contacts, spring-loaded terminals. Rated 1 A at 24 V. Phased-out; successor is 3RV2901-2E. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Motor Protection Circuit Breakers (MPCB)"],"specifications":{"Solid":"2x (0.5 ... 2.5 mm²)","at 24 V":"1 A","at 48 V":"0.3 A","at 60 V":"0.15 A","at 230 V":"0.5 A","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, transverse on the front","Design Of The Product":"transverse auxiliary switches","Size Of The Circuit-Breaker":"S00, S0, S2, S3","Substance Prohibitance (Date)":"07/01/2006","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 of auxiliary contacts at AC-12 maximum":"2.5 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":"1","number of NO contacts for auxiliary contacts instantaneous contact":"1","AWG number as coded connectable conductor cross section for auxiliary contacts":"20 ... 14"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=48652&mlfb=3RV1901-2E","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RV1901-2E/alternatives.json"},"ai":{"faq":[{"question":"What is the 3RV1901-2E used for?","answer":"It is a transverse auxiliary switch that mounts on the front of SIRIUS 3RV circuit breakers (sizes S00, S0, S2, S3) to provide remote status indication or control logic via its 1 NO + 1 NC instantaneous contacts."},{"question":"What wire sizes does the 3RV1901-2E accept?","answer":"The spring-loaded terminals accept 2x (0.5... 2.5 mm²) solid or stranded, and 2x (20... 14) AWG. Finely stranded wire with or without ferrule is 2x (0.5... 1.5 mm²)."},{"question":"Where can I buy the 3RV1901-2E?","answer":"This phased-out part is sourced and quoted to order through independent distribution. Availability and current pricing are confirmed at quote time against an RFQ."},{"question":"What compliance documentation is available for the 3RV1901-2E?","answer":"The part carries a substance prohibitance date of 07/01/2006, indicating RoHS compliance from that date. Refer to the Siemens SIRIUS documentation package for full REACH and UL declarations."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV1901-2E","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/3RV1901-2E when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-09-02T08:15:54.622Z","lastPublished":"2026-09-02T08:15:54.622Z","indexable":true}}