The HP 313054-B21 is a 400-watt hot-pluggable power supply unit designed to offer superior power efficiency and redundancy for HP servers and storage systems. Featuring hot-pluggable capability, this PSU allows for easy installation and replacement without the need to shut down the system, greatly reducing downtime and maintaining business continuity. With a power output of 400 watts, it ensures that your system has enough power to support all its components and maintain optimum performance. The PSU is engineered to meet HP's high-quality standards, providing stable and reliable power output even under heavy loads and in demanding operational conditions. It is an ideal power solution for data centers and businesses that prioritize uptime, efficiency, and scalability in their server and storage infrastructure.