{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RU1900-1B","brand":"Siemens","brandSlug":"siemens","productSlug":"3RU1900-1B","canonicalUrl":"https://aoctrl.com/siemens/3RU1900-1B","factsUrl":"https://aoctrl.com/api/mcp/products/3RU1900-1B","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS cable release with holder for RESET, 400 mm long, for 3RU11/3RB20/3RB21 overload relays size S00, S0, S2, S3.","salesMarkdown":"The Siemens 3RU1900-1B is a SIRIUS cable release with a holder for RESET, measuring 400 mm long. It fits the S00, S0, S2, and S3 frame sizes of 3RU11 and 3RB20/3RB21 overload relays — the common sizes across Siemens' compact motor starter lineup. This part is listed as a phased-out product. The official Siemens successor is the 3RU2900-1B, and the preferred successor type is also the 3RB3980-0B. For BOM lines that still call out the 3RU1900-1B, the 3RU2900-1B is the drop-in replacement to spec in — same function, same mounting footprint for S00 through S3 frames. ## What it does in the panel This cable release lets you mount the RESET button remotely from the overload relay face — useful when the relay is buried inside a panel or behind a guard door. The 400 mm length gives enough reach to bring the reset to a convenient spot on the enclosure door or subpanel. It clips onto the relay's front without tools.","metaTitle":"Siemens 3RU1900-1B SIRIUS Cable Release for Reset, 0.4m","metaDescription":"Siemens 3RU1900-1B SIRIUS cable release with holder for RESET, 400 mm long. Fits overload relays size S00–S3. Phased-out product; successor is 3RU2900-1B. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Overload Relays"],"specifications":{"title":"3RU1900-1B","description":"Cable release for reset 0.4 m for 3RU11/3RB20/3RB21 Size S00...S3!!! Phased-out product!!! Successor is SIRIUS 3RU2 Preferred successor type is >>3RU2900-1B or >>3RB3980-0B<<","During Storage":"-50 ... +80°C","lifecycle_stage":"current","During Operation":"-20 ... +70°C","Product Brand Name":"SIRIUS","Product Designation":"cable release with holder for RESET","Design Of The Product":"400 mm long","Size Of Overload Relay":"S00, S0, S2, S3"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/5b429be615fd5b933087a23ccea87bda.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=312306&mlfb=3RU1900-1B"},"ai":{"faq":[{"question":"What is the 3RU1900-1B used for?","answer":"It is a cable release with a holder for the RESET function on Siemens 3RU11, 3RB20, and 3RB21 overload relays of sizes S00, S0, S2, and S3. It lets you relocate the reset button up to 400 mm away from the relay body."},{"question":"Where can I buy the 3RU1900-1B and get a price?","answer":"This part is sourced to order through independent distribution. Submit an RFQ for current availability and pricing — confirmed at quote time, not from a shelf count."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RU1900-1B","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/3RU1900-1B when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}