The Siemens 6ES5184-3UA11 is a robust and reliable expansion unit, designed to enhance the functionality of your Simatic S5 PLC Systems. This unit operates at a voltage of 230 V AC, ensuring efficient performance in a variety of industrial automation applications. With 21 slots, it provides ample space for additional modules, allowing for system expansion and customisation based on your specific needs. The unit comes without a power supply and manual, offering you the flexibility to choose components that best suit your system requirements. Please note that this is a spare part, indicating its importance in maintaining the optimal operation of your PLC system. The Siemens 6ES5184-3UA11 expansion unit is a testament to Siemens' commitment to quality, innovation, and durability in the field of industrial automation.