The Siemens 6ES7408-1TB00-0XA0 is a fan sub-assembly module designed for use with the Simatic S7-400 PLC rack system. This module is specifically designed to fit a rack with 18 slots and operates at either 120 or 230 V AC. The fan module plays a crucial role in maintaining the optimal operating temperature of the PLC system, thereby ensuring its longevity and reliability. With a maximum power loss of 20 W, it is energy-efficient and designed to minimise the impact on your overall system's power consumption. The module also features relay outputs with a rated supply voltage of 24 V DC and a maximum switching capacity of 200 mA with resistive load. The dimensions of the module are 482.5 mm in width, 109.5 mm in height, and 235 mm in depth, and it weighs approximately 2 kg. This Siemens fan module is a high-quality, reliable component that can enhance the performance and lifespan of your Simatic S7-400 PLC system.