{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV1901-1E","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV1901-1E","canonicalUrl":"https://aoctrl.com/siemens/3RV1901-1E","factsUrl":"https://aoctrl.com/api/mcp/products/3RV1901-1E","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RV1901-1E transverse auxiliary switch, 1 NO + 1 NC, screw-type terminals, max 2.5 A, for circuit breaker sizes S00, S0, S2, S3.","salesMarkdown":"The Siemens 3RV1901-1E is a SIRIUS transverse auxiliary switch designed to mount on the front of circuit breakers in sizes S00, S0, S2, and S3. It provides one normally-open and one normally-closed instantaneous contact, giving you a local status signal from the breaker without needing a separate contactor or relay. The screw-type terminals accept 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²) solid/stranded wire, which covers the typical control-circuit wiring in a panel. The maximum switching current is 2.5 A, but the usable current drops with voltage: 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 24 V rating of 1 A is typical for a DC control loop feeding a small relay or indicator. If your circuit draws more than these per-voltage limits, the contact will overheat or weld closed. The 3RV1901-1E is a phased-out product. Siemens lists the official successor as the 3RV2901-1E. If you have an existing BOM or panel that uses this switch, the 3RV2901-1E is the drop-in replacement to spec for new builds. The switch uses plug-in fixing — it snaps onto the front of the circuit breaker without tools. The physical footprint is 45 mm wide by 12 mm tall by 17 mm deep, so it adds minimal depth to the breaker assembly. The screw terminals are sized for a Pozidriv #2 or flathead 5–6 mm driver, and the torque spec for auxiliary contacts is 0.8 to 1.2 N·m. Wire strip length should be 8 mm to avoid exposed conductor past the terminal cage.","metaTitle":"Siemens 3RV1901-1E SIRIUS Auxiliary Switch, 1NO+1NC, 2.5A","metaDescription":"Siemens 3RV1901-1E SIRIUS transverse auxiliary switch, 1NO+1NC, rated 2.5A max. Phased-out; official successor is 3RV2901-1E. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Motor Protection Circuit Breakers (MPCB)"],"specifications":{"Depth":"17mm","Solid":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","Width":"45mm","Height":"12mm","Maximum":"2.5A","at 24 V":"1A","at 48 V":"0.3A","at 60 V":"0.15A","at 230 V":"0.5A","During Storage":"-50 ... +80°C","lifecycle_stage":"current","During Operation":"-20 ... +60°C","Fastening Method":"plug-in fixing","Product Brand Name":"SIRIUS","Product Designation":"auxiliary switch, transverse on the front","Design Of The Product":"transverse auxiliary switches","With Core End Processing":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","Size Of The Circuit-Breaker":"S00, S0, S2, S3","at AWG cables for auxiliary contacts":"2x (18 ... 14)","Type Of Electrical Connection For Auxiliary And Control Circuit":"screw-type 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"}},"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=442456&mlfb=3RV1901-1E","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RV1901-1E/alternatives.json"},"ai":{"faq":[{"question":"What is the 3RV1901-1E used for?","answer":"It is a transverse auxiliary switch that mounts on the front of SIRIUS circuit breakers (sizes S00, S0, S2, S3) to provide one NO and one NC instantaneous contact for status feedback or control interlocking."},{"question":"What are the contact ratings for the 3RV1901-1E?","answer":"Maximum switching current is 2.5 A, with voltage-specific limits: 1 A at 24 V, 0.3 A at 48 V, 0.15 A at 60 V, and 0.5 A at 230 V."},{"question":"Where can I buy the 3RV1901-1E?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."},{"question":"Will the 3RV1901-1E drop into a panel wired for the 3RV2021-1FA15?","answer":"Not directly — the 3RV2021-1FA15 is a motor-protective circuit breaker with a different form factor and mounting (DIN rail snap-on). The 3RV1901-1E is an auxiliary switch that mounts onto the front of a breaker, not a standalone breaker. The two parts serve different functions in the panel."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV1901-1E","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/3RV1901-1E 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}}