The Mitsubishi Q55B is a high-performance extension base unit designed for the MELSEC-Q Series, featuring 5 slots and a compact depth of 44.1 mm. This extension rack, lacking a power supply unit (PSU), is ideal for expanding your programmable logic controller (PLC) systems, offering seamless integration and reliable performance. As part of Mitsubishi Electric's renowned industrial automation solutions, the Q55B ensures efficient operation in complex automation environments.