The 6ES7138-4AA01-0AA0 from Siemens is a set of reserve modules designed for use with the SIMATIC ET 200S distributed I/O system. Each module measures 15 mm in width and serves as a placeholder for unused slots within the ET 200S station. This pack includes five reserve modules, ensuring that open locations remain properly reserved and protected. These modules help maintain the structure and integrity of your I/O configuration, minimizing exposure to environmental influences and supporting future system expansions or modifications. The 6ES7138-4AA01-0AA0 is built with Siemens’ focus on reliability and efficient integration in industrial automation environments. Project managers and production leaders benefit from the quick installation and the assurance that system upgrades can be performed smoothly. Brand: Siemens Quick delivery from large stock, reducing downtime Supports sustainable operations with high-quality, reliable components