{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RA1942-2G","brand":"Siemens","brandSlug":"siemens","productSlug":"3RA1942-2G","canonicalUrl":"https://aoctrl.com/siemens/3RA1942-2G","factsUrl":"https://aoctrl.com/api/mcp/products/3RA1942-2G","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RA1942-2G mechanical connector, for contactor assemblies size S3, 4-pole reversing, contactor clearance 10 mm, comprising 2 mechanical connectors for 1 combination.","salesMarkdown":"## What this connector does in a reversing contactor assembly The 3RA1942-2G is a mechanical interlock connector for SIRIUS S3 contactors, designed specifically for 4-pole reversing assemblies where two contactors share a common load and must never close simultaneously. The connector enforces a 10 mm clearance between the contactor faces — that gap is the physical barrier that prevents both contactors from pulling in at the same time, which would short the phases through the reversing bridge. It ships as a kit of two mechanical connectors per combination, so one order covers one reversing pair. The part is branded SIRIUS, Siemens' modular contactor and motor starter platform for panel builds up to 400 V / 690 V class. ## Lifecycle reality — active but with a successor For a procurement decision: if the BOM already carries the 3RA1942-2G and the line is running, the current lifecycle status means you can still source it. For a new panel build or a BOM revision, the successor 3RA2942-2G is the cleaner path — same S3 reversing function, same clearance, same mechanical interface. ## Compliance and documentation This indicates the 3RA1942-2G was designed to meet RoHS restrictions on lead, mercury, cadmium, and other substances from that date forward.","metaTitle":"Siemens 3RA1942-2G SIRIUS Mechanical Connector, S3 Reversing","metaDescription":"Siemens SIRIUS 3RA1942-2G mechanical connector for S3 4-pole reversing contactor assemblies, 10 mm clearance. Active lifecycle. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Motor Starters"],"specifications":{"title":"3RA1942-2G","description":"Mechanical connectors for contactor assemblies Size S3, 4-pole for reversing,contactor clearance 10 mm Comprising 2 mechanical connectors for 1 combination!!! Phased-out product!!! Successor is SIRIUS 3RA2 Preferred successor type is >>3RA2942-2G<<","lifecycle_stage":"current","Product Brand Name":"SIRIUS","Product Designation":"Mechanical connectors","Design Of The Product":"for contactor assemblies size S3, 4-pole for reversing, contactor clearance 10 mm","Substance Prohibitance (Date)":"07/01/2006"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$2.54","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/3fdae1757f00c2524869f5dce476574b.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=397920&mlfb=3RA1942-2G"},"ai":{"faq":[{"question":"What is the direct replacement for 3RA1942-2G?","answer":"The official Siemens successor is the SIRIUS 3RA2942-2G. It serves the same function — mechanical connector for S3 4-pole reversing contactor assemblies with 10 mm clearance — and is the preferred type for new designs."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RA1942-2G","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/3RA1942-2G 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}}