{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RK1903-0CH20","brand":"Siemens","brandSlug":"siemens","productSlug":"3RK1903-0CH20","canonicalUrl":"https://aoctrl.com/siemens/3RK1903-0CH20","factsUrl":"https://aoctrl.com/api/mcp/products/3RK1903-0CH20","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RK1903-0CH20 control module for ET200S, 2 digital inputs 24 V DC, COM interface for PC cable 6ED1057-1AA00-0BA0.","salesMarkdown":"The Siemens 3RK1903-0CH20 is a control module for the ET200S High Feature Starter and ET200S Failsafe Starter systems. It provides 2 digital inputs at 24 V DC for local input functions or manual operation, and includes a COM interface for connection to a PC cable. It handles the local pushbutton and selector switch inputs that feed the failsafe logic. Storage temperature range of 0 to 60 °C is narrower than the operating range — the module should be kept in conditioned storage between those limits before installation. This is typical for electronics with electrolytic capacitors or LCD components that degrade outside that band. ## Integration notes The COM interface on this module connects directly to a Siemens PC cable for configuration and diagnostics via the ET200S backplane. No additional gateway or bus coupler is needed for the local I/O functions. The 2 DI 24 V DC inputs are intended for local pushbuttons, selector switches, or sensor feedback that must be read by the failsafe starter logic. They are not general-purpose ET200S input slices — they are specific to the starter control function.","metaTitle":"Siemens 3RK1903-0CH20 ET200S Control Module, 2 DI 24 V DC","metaDescription":"Siemens 3RK1903-0CH20 control module for ET200S High Feature Starter. 2 DI 24 V DC, lifecycle stage current. Operating temp -40...+80 °C. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Remote I/O & Fieldbus Modules"],"specifications":{"title":"3RK1903-0CH20","description":"2 DI 24 V DC LC COM Control module for ET200S High Feature Starter for ET 200S Failsafe Starter for local input functions or for manual operation with COM interface for PC cable 6ED1057-1 AA00-0BA0","During Storage":"0 ... 60 °C","lifecycle_stage":"current","During Operation":"-40 ... +80 °C","Substance Prohibitance (Date)":"05/01/2012"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$133.35","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=217174&mlfb=3RK1903-0CH20"},"ai":{"faq":[{"question":"What is the operating temperature range?","answer":"The module operates from -40 to +80 °C, suitable for cold environments or hot cabinet interiors. Storage range is 0 to 60 °C."},{"question":"Will the 3RK1903-0CH20 drop into a panel specified around a 3RT1023-1AL20 contactor?","answer":"No. The 3RK1903-0CH20 is a control module for ET200S starter systems, while the 3RT1023-1AL20 is a SIRIUS power contactor. They serve different functions and mount on different DIN-rail profiles within the cabinet."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RK1903-0CH20","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/3RK1903-0CH20 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}}