{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RK1903-0CD00","brand":"Siemens","brandSlug":"siemens","productSlug":"3RK1903-0CD00","canonicalUrl":"https://aoctrl.com/siemens/3RK1903-0CD00","factsUrl":"https://aoctrl.com/api/mcp/products/3RK1903-0CD00","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RK1903-0CD00 spacer module for ET 200S, recommended for ambient temperature ≥40 °C or from 6.3 A starter rated current, lifecycle stage current.","salesMarkdown":"## What this spacer does in an ET 200S line The 3RK1903-0CD00 is a spacer module for the Siemens ET 200S distributed I/O system. It creates physical separation between modules when the ambient temperature hits 40 °C or higher, or when a starter rated at 6.3 A or above is in the string — conditions where standard module-to-module spacing doesn't shed enough heat. ## Why you'd reach for it If you're packing starters into an ET 200S node and the ambient in the panel is pushing 40 °C, or you've got a 6.3 A starter on the rail, Siemens calls for this spacer between the power module and the first starter. Without it, the heat rise from adjacent high-current loads can trip the thermal overload early or shorten the life of the electronics. The substance prohibitance date of 05/01/2012 marks its RoHS compliance baseline — it meets the EU RoHS deadline for removing lead, mercury, cadmium, and the other restricted substances from electrical equipment. ## Sourcing reality for the BOM line This is a current-production Siemens SIRIUS part, so it's quoted to order against your BOM quantity through authorized distribution.","metaTitle":"Siemens 3RK1903-0CD00 ET 200S Spacer Module","metaDescription":"Siemens 3RK1903-0CD00 spacer module for ET 200S, recommended above 40°C or with 6.3 A starters. Lifecycle stage: current. Quoted to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Remote I/O & Fieldbus Modules"],"specifications":{"title":"3RK1903-0CD00","description":"Spacer module for ET 200S Recommended for ambient temperature of 40 °C or higher or from 6.3 A Starter rated current","lifecycle_stage":"current","Substance Prohibitance (Date)":"05/01/2012"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/2506c84bc50fd54eb200b0e325c9c833.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=249043&mlfb=3RK1903-0CD00"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RK1903-0CD00","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/3RK1903-0CD00 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}}