{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RA2921-2G","brand":"Siemens","brandSlug":"siemens","productSlug":"3RA2921-2G","canonicalUrl":"https://aoctrl.com/siemens/3RA2921-2G","factsUrl":"https://aoctrl.com/api/mcp/products/3RA2921-2G","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS link module 3RA2921-2G, S0 size, clip-on fastening, spring-type terminals, for 3RV2021 and 3RW3.2/3RW402.","salesMarkdown":"The Siemens 3RA2921-2G is a SIRIUS link module — the mechanical and electrical bridge between a 3RV2021 motor-protective circuit breaker and a 3RW3.2 or 3RW402 soft starter (or contactor, depending on the build). It clips onto the S0 frame size, so it mates with the 3RV2021's S0 footprint without extra hardware. The spring-type terminals on this module accept the wiring from the soft starter side, keeping the assembly compact inside a panel. ## Clip-On Fit and Panel Integration Fastening is clip-on. The S0 frame size keeps the stack depth consistent with the 3RV2021 breaker.","metaTitle":"Siemens 3RA2921-2G SIRIUS Link Module, S0, Clip-On","metaDescription":"Siemens 3RA2921-2G SIRIUS link module for 3RV2021 and 3RW3.2/3RW402. S0 size, clip-on mounting, spring-type terminals.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Motor Starters"],"specifications":{"title":"3RA2921-2G","description":"Link module Electrical and mechanical for 3RV2021 and 3RW3.2, 3RW402 Spring-type terminal (multi-unit packaging)","lifecycle_stage":"current","Fastening Method":"clip-on","Product Brand Name":"SIRIUS","Product Designation":"link module","Size Of The Circuit-Breaker":"S0"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/e363b5fc21cba9b27299945325520230.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=276835&mlfb=3RA2921-2G"},"ai":{"faq":[{"question":"Is 3RA2921-2G compatible with 3RV2021 circuit breaker?","answer":"Yes, the 3RA2921-2G is specifically designed for the 3RV2021 motor-protective circuit breaker in the S0 frame size. It clips onto the breaker and provides the electrical connection to the soft starter."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RA2921-2G","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/3RA2921-2G when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-22T19:47:38.189Z","lastPublished":"2026-07-22T19:47:38.189Z","indexable":true}}