The Sirius 3RK3 allows operators to quickly and easily replace devices as necessary or expand the system as needed. The system’s central unit is designed with eight safety-related inputs, one safety-related relay output, and one safety-related solid-state output. Users can connect up to seven expansion modules to the central unit. Expansion modules include safety-oriented input modules, mixed modules with safe inputs and relay or electronic outputs, and standard output modules. The Sirius 3RK3 is certified for use in safety applications to Cat 4 in accordance with EN954-1, and SIL3 in accordance with IEC 61508/62061.
Siemens Energy & Automation Inc.
www.sea.siemens.com
800.241.4463
Siemens Energy & Automation Inc.
www.sea.siemens.com
800.241.4463























![Mps035 Sm 1200x628 D[2]](https://img.automationworld.com/files/base/pmmi/all/image/2021/03/MPS035_SM_1200x628_D_2_.604a4a336bc60.png?auto=format%2Ccompress&bg=fff&fill-color=fff&fit=fill&h=146&pad=5&q=70&w=340)








