{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV1901-1G","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV1901-1G","canonicalUrl":"https://aoctrl.com/siemens/3RV1901-1G","factsUrl":"https://aoctrl.com/api/mcp/products/3RV1901-1G","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RV1901-1G transverse auxiliary switch, electronics-compatible, 1 CO contact, for circuit breaker sizes S00 through S3, 0.3 A at 24 V, screw-type terminals, IP20.","salesMarkdown":"The Siemens 3RV1901-1G is an electronics-compatible transverse auxiliary switch from the SIRIUS family, designed as a snap-on accessory for SIRIUS 3RV circuit breakers in frame sizes S00, S0, S2, and S3. It provides a single changeover (CO) contact rated at 0.3 A at 24 V, 48 V, and 60 V — suitable for signaling the breaker's tripped or ON/OFF status back to a PLC or indicator lamp. The 1 CO contact (one normally-open plus one normally-closed in a single changeover package) means this switch occupies one auxiliary position on the breaker and provides both a closed-when-tripped and open-when-tripped signal from the same terminal block — useful for dual-indication circuits. The 0.3 A rating at 24 V through 60 V is a low-energy signal rating, not a load-switching rating; it is intended for PLC digital inputs or 24 VDC pilot lamps, not for driving contactor coils directly. The screw-type terminals accept 2 x (0.5 to 1.5 mm²) solid or 2 x (0.75 to 2.5 mm²) stranded, with AWG 18–14 for the auxiliary contact wiring. ## Panel Integration Mounts via plug-in fixing directly onto the front of SIRIUS 3RV circuit breakers in sizes S00, S0, S2, and S3. The transverse design places the terminals on the side of the breaker, allowing the auxiliary switch to sit alongside other front-mounted accessories without increasing the DIN-rail footprint. At 45 mm wide, 12 mm high, and 17 mm deep, it adds minimal projection beyond the breaker face. No additional DIN-rail space is consumed.","metaTitle":"Siemens 3RV1901-1G SIRIUS Auxiliary Switch, 1 CO, 0.3A at 24","metaDescription":"Siemens 3RV1901-1G SIRIUS transverse auxiliary switch, 1 CO contact, 0.3A at 24V. For S00-S3 breakers. IP20, screw terminals. Sourced to order; RFQ for current pricing.","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","at 24 V":"0.3A","at 48 V":"0.3A","at 60 V":"0.3A","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":"electronics compatible transverse auxiliary switch","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)","touch protection on the front acc. to IEC 60529":"finger-safe, for vertical contact from the front","protection class IP on the front acc. to IEC 60529":"IP20","Type Of Electrical Connection For Auxiliary And Control Circuit":"screw-type terminals","number of CO contacts of auxiliary contacts instantaneous contact":"1","number of NC contacts for auxiliary contacts instantaneous contact":"0","number of NO contacts for auxiliary contacts instantaneous contact":"0"}},"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=164877&mlfb=3RV1901-1G","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RV1901-1G/alternatives.json"},"ai":{"faq":[{"question":"What replaces the 3RV1901-1G?","answer":"The official Siemens replacement is the 3RV2901-1G, part of the SIRIUS 3RV2 series. It is the preferred successor type for this auxiliary switch."},{"question":"What circuit breaker sizes does the 3RV1901-1G fit?","answer":"It fits SIRIUS 3RV circuit breakers in frame sizes S00, S0, S2, and S3."},{"question":"What are the key ratings of the 3RV1901-1G?","answer":"It provides 1 CO contact rated at 0.3 A at 24 V, 48 V, and 60 V. The screw terminals accept 2 x (0.5 to 1.5 mm²) solid or 2 x (0.75 to 2.5 mm²) stranded wire. The front is IP20 finger-safe per IEC 60529."},{"question":"Where can I buy the 3RV1901-1G?","answer":"The 3RV1901-1G is sourced and quoted to order through independent distribution channels. Submit an RFQ for current pricing and availability; stock levels and lead times are confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV1901-1G","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/3RV1901-1G 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}}