{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV1901-2A","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV1901-2A","canonicalUrl":"https://aoctrl.com/siemens/3RV1901-2A","factsUrl":"https://aoctrl.com/api/mcp/products/3RV1901-2A","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RV1901-2A, lateral auxiliary switch, 1 NO + 1 NC, spring-loaded terminals, for circuit breaker sizes S00...S3, rated 10A maximum.","salesMarkdown":"The Siemens 3RV1901-2A is a lateral auxiliary switch from the SIRIUS family, designed to snap onto the side of 3RV2 circuit breakers in sizes S00, S0, S2, or S3. Termination is via spring-loaded terminals (cage clamp), accepting 2x (0.5... 2.5 mm²) solid or 2x (0.5... 1.5 mm²) stranded with ferrules. This avoids screw-torque checks during panel build — strip to 8 mm and push in. ## Lifecycle — phased out, successor active The 3RV1901-2A is a phased-out product. The official Siemens successor is the 3RV2901-2A, a direct drop-in replacement with the same footprint, contact arrangement, and terminal style. Contact ratings are given per switching voltage, not a single blanket figure. The maximum thermal current is 10 A, but the make/break capacity at AC-15 drops with voltage: 4 A at 230 V, 3 A at 400 V, and 1 A at 690 V. For DC control circuits, it's 2 A at 24 V and 0.25 A at 220 V. These are the limits for pilot-duty signaling — do not derate from the 10 A maximum without checking the voltage-specific row. The part mounts via plug-in fixing — it clips onto the side of the breaker without tools. No DIN-rail space consumed. ## Sourcing and RFQ posture The 3RV1901-2A is not a current-production item. For new designs, specify the 3RV2901-2A. For installed-base support or a last-time-buy, we source the 3RV1901-2A through independent channels against an RFQ. Submit a quote request with your target quantity and timeline; availability and pricing are confirmed at that point.","metaTitle":"Siemens 3RV1901-2A SIRIUS Auxiliary Switch, 1NO+1NC, Spring","metaDescription":"Siemens 3RV1901-2A SIRIUS lateral auxiliary switch for S00-S3 breakers. 1NO+1NC, spring-loaded terminals, rated 10A. Phased-out; successor 3RV2901-2A available. 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)","Maximum":"10A","at 24 V":"2A","at 110 V":"0.5A","at 220 V":"0.25A","at 230 V":"4A","at 400 V":"3A","at 690 V":"10A","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, lateral","Design Of The Product":"lateral auxiliary switches","With Core End Processing":"2x (0.5 ... 1.5 mm²)","Size Of The Circuit-Breaker":"S00, S0, S2, S3","Without Core End Processing":"2x (0.5 ... 1.5 mm²)","at AC-15 at 690 V rated value":"1A","at AWG cables for auxiliary contacts":"2x (20 ... 14)","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"}},"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=93711&mlfb=3RV1901-2A","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RV1901-2A/alternatives.json"},"ai":{"faq":[{"question":"What breaker sizes does the 3RV1901-2A fit?","answer":"It fits Siemens 3RV2 circuit breaker sizes S00, S0, S2, and S3. It clips onto the side of any of those frames."},{"question":"What is the contact configuration on 3RV1901-2A?","answer":"One normally-open and one normally-closed instantaneous auxiliary contact (1 NO + 1 NC)."},{"question":"Can I buy the 3RV1901-2A?","answer":"Yes, it is sourced to order against an RFQ through independent distribution. Submit a quote request for current availability and pricing — it is not stocked as a standard production item."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV1901-2A","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/3RV1901-2A 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}}