{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV1938-1A","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV1938-1A","canonicalUrl":"https://aoctrl.com/siemens/3RV1938-1A","factsUrl":"https://aoctrl.com/api/mcp/products/3RV1938-1A","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS disconnector module, Size S2, for motor circuit breaker, 149mm depth, 55mm width, 57mm height, -20 to +70°C operation.","salesMarkdown":"The Siemens 3RV1938-1A is a SIRIUS disconnector module designed for Size S2 motor circuit breakers. It provides a visible isolating distance and can be locked in the disengaged position, giving a positive mechanical disconnect for safe maintenance access. The 3RV1938-1A is a phased-out product. The official Siemens successor is the SIRIUS 3RV2 series, with the preferred replacement order code 3RV2938-1A. The visible isolating distance means the module creates a physical air gap you can see when disengaged — a requirement for lockout/tagout on motor circuits. The lockable disengaged position lets you secure the disconnect with a padlock, meeting OSHA-style isolation needs. Size S2 tells you it mates with S2-frame Siemens breakers like the 3RV20 series; the 55 mm width matches the standard S2 module pitch, so it drops into the same DIN-rail slot as the breaker it serves. ## Deployment Context Use it upstream of the breaker as a service disconnect — the visible gap confirms the circuit is dead before you open the panel. The lockable handle accepts standard padlock hasps for group lockout procedures.","metaTitle":"Siemens 3RV1938-1A SIRIUS Disconnector Module, Size S2","metaDescription":"Siemens 3RV1938-1A SIRIUS disconnector module for Size S2 motor circuit breakers. Visible isolating distance, lockable. Sourced to order. Depth 149mm.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Motor Protection Circuit Breakers (MPCB)"],"specifications":{"Depth":"149mm","Width":"55mm","Height":"57mm","During Storage":"-50 ... +80°C","lifecycle_stage":"current","During Operation":"-20 ... +70°C","Product Brand Name":"SIRIUS","Product Designation":"disconnector module","Suitability For Use":"motor circuit breaker","Design Of The Product":"visible isolating distance, can be locked in disengaged position","Size Of The Circuit-Breaker":"S2"}},"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=313855&mlfb=3RV1938-1A","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RV1938-1A/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RV1938-1A?","answer":"The 3RV1938-1A is sourced to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."},{"question":"What temperature range does 3RV1938-1A support?","answer":"Operating -20 to +70 °C; storage -50 to +80 °C."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV1938-1A","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/3RV1938-1A 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}}