NORDEN Power Distribution Units are designed to improve uptime and energy efficiency while reducing operating costs. Based on the Sustainable. Upgradeable, and Maintainable concept. Norden’s unique screw-free hot swap controller design allows quick and easy replacement of PDU modules. With this technology, users can upgrade the PDU firmware features and performance with time. and replacing the output modules allows the user to upgrade an input monitored PDU to a switched one.