{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RA2912-0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RA2912-0","canonicalUrl":"https://aoctrl.com/siemens/3RA2912-0","factsUrl":"https://aoctrl.com/api/mcp/products/3RA2912-0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RA2912-0 function module, basic module for star-delta (wye-delta) starter, for mounting to contactors 3RT2.","salesMarkdown":"The Siemens 3RA2912-0 is a SIRIUS function module that serves as the basic building block for a star-delta (wye-delta) motor starter, designed to mount directly onto 3RT2 contactors. This module handles the interlocking and timing logic that a star-delta transition requires, so you don't need to wire separate timers and auxiliary contactors for the changeover. ## Integration with the contactor set The module snaps onto the contactors and physically bridges the power connections between the line, star, and delta contactors in a 3RT2-based starter assembly. Because it's a dedicated function module rather than a handful of loose timers and relays, the panel wiring is cleaner and the transition timing is fixed by the module's internal circuitry — no field adjustment of timing relays.","metaTitle":"Siemens 3RA2912-0 SIRIUS Star-Delta Module","metaDescription":"Siemens 3RA2912-0 SIRIUS function module for star-delta starters, mounts to 3RT2 contactors. Currently in production. Sourced to order via RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Motor Starters"],"specifications":{"title":"3RA2912-0","description":"Basic module for star-delta (wye-delta) starter for mounting to contactors 3RT2","lifecycle_stage":"current","Product Brand Name":"SIRIUS","Product Designation":"function module"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$5.43","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/422c6f3397e20793b59a1e34ac45e15c.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=477802&mlfb=3RA2912-0"},"ai":{"faq":[{"question":"What is the 3RA2912-0 used for?","answer":"The 3RA2912-0 is a basic function module for building a star-delta (wye-delta) motor starter. It mounts onto Siemens 3RT2 contactors and handles the interlocking and transition logic needed to switch a motor from star to delta during startup."},{"question":"What contactors is the 3RA2912-0 compatible with?","answer":"The 3RA2912-0 is designed for mounting to Siemens 3RT2 series contactors. It physically attaches to them and bridges the power connections between the line, star, and delta contactors in the starter assembly."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RA2912-0","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/3RA2912-0 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}}