The Mitsubishi Q55B is a System Q rack extension designed to accommodate five slots for modular expansion. It is specifically engineered to enhance the functionality of your System Q architecture, providing increased capacity for additional modules. The Q55B does not include a power supply unit (PSU), allowing for tailored power solutions based on your system requirements. This extension is ideal for applications that need scalable control and automation solutions, ensuring compatibility and seamless integration with existing Mitsubishi components.