{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV1901-2B","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV1901-2B","canonicalUrl":"https://aoctrl.com/siemens/3RV1901-2B","factsUrl":"https://aoctrl.com/api/mcp/products/3RV1901-2B","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS lateral auxiliary switch, 3RV1901-2B, 2 NO, spring-loaded terminals, for circuit breaker sizes S00 through S3.","salesMarkdown":"The contact ratings are voltage-dependent — a common reality with auxiliary contacts. At 24 V it switches 2 A; at 230 V it handles 4 A; at 400 V it's rated 3 A; and at 690 V it carries 10 A. The AC-15 rating at 690 V is 1 A, which is the inductive-load limit for that voltage class. That means for a 24 VDC PLC input signal you have headroom to 2 A, but for a 690 V contactor coil you're limited to 1 A. The maximum thermal current is 10 A — that's the absolute limit through the contacts regardless of voltage, so the real-world working current is always the lower of the voltage-specific rating and 10 A. Wire capacity: accepts 2x (0.5 to 2.5 mm²) solid, or 2x (0.5 to 1.5 mm²) with ferruled stranded ends. AWG equivalent is 2x (20 to 14). That's standard for auxiliary wiring in control panels. ## Lifecycle reality — phased out, successor known The 3RV1901-2B is a phased-out product. The official Siemens successor is the 3RV2901-2B, part of the newer SIRIUS 3RV2 family. For new designs, the 3RV2901-2B is the direct drop-in replacement. ## Environmental limits The storage limit is wider because it governs handling and shelf life, not running conditions.","metaTitle":"Siemens 3RV1901-2B SIRIUS Auxiliary Switch, 2 NO, Spring Ter","metaDescription":"Siemens 3RV1901-2B SIRIUS lateral auxiliary switch, 2 NO contacts, spring-loaded terminals for S00-S3 breakers. Phased out; successor 3RV2901-2B. 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":"0","number of NO contacts for auxiliary contacts instantaneous contact":"2"}},"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=80324&mlfb=3RV1901-2B","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RV1901-2B/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RV1901-2B?","answer":"The 3RV1901-2B is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."},{"question":"What replaces 3RV1901-2B?","answer":"The official Siemens successor is 3RV2901-2B, part of the SIRIUS 3RV2 family. It is the preferred replacement type."},{"question":"What wire sizes does 3RV1901-2B accept?","answer":"Solid wire: 2x (0.5 to 2.5 mm²). Stranded with ferrule: 2x (0.5 to 1.5 mm²). AWG equivalent: 2x (20 to 14)."},{"question":"What is the maximum current rating of 3RV1901-2B?","answer":"The maximum thermal current is 10 A. Voltage-specific ratings apply: 2 A at 24 V, 4 A at 230 V, 3 A at 400 V, 10 A at 690 V, and 1 A at 690 V AC-15 inductive load."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV1901-2B","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/3RV1901-2B 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}}