A PDU consists of input power connections, output outlets, circuit breakers, monitoring and control modules, relays, and optional environmental sensors.

Core Components

1. AC Inlet and Input Power Cable The PDU receives power from a utility feed, generator, or UPS system through an AC inlet and input power cable, which serves as the primary source for distribution to connected devices . 2. Main Circuit Breaker This protects the PDU and connected equipment from overloads or short circuits by controlling the overall power flow into the unit . 3. Individual Outlets and Main Output PDUs distribute power to multiple devices via individual outlets. The main output channels electricity from the input to these outlets, ensuring organized and safe power delivery . 4. Relays and Switching Modules Relays allow users to switch power on or off to specific outlets, enabling remote control and load management, particularly in intelligent or switched PDUs . 5. Monitoring and Control Modules Intelligent PDUs include control boards and network interfaces for real-time monitoring of voltage, current, and energy consumption. They may also allow remote outlet-level control and integration with DCIM software . 6. Ground-Fault Interrupter (GFI) Module This component prevents electrical hazards by detecting ground faults and interrupting power to protect personnel and equipment . 7. EMI Filters Electromagnetic interference (EMI) filters prevent excess noise from entering the power line, ensuring stable and clean power delivery . 8. Auxiliary Outputs Some PDUs provide auxiliary outputs to monitor breaker status or connect additional devices, enhancing system visibility and management . 9. Environmental Sensors (Optional) Advanced PDUs may include temperature, humidity, and airflow sensors to monitor the data center environment and optimize cooling and energy efficiency .

Summary

PDUs range from basic units, which primarily distribute power, to intelligent PDUs, which offer advanced monitoring, remote control, and environmental management. Key components across all PDUs include input connections, circuit breakers, output outlets, relays, monitoring modules, and safety features. Intelligent PDUs expand functionality with network interfaces, outlet-level control, and environmental sensors, making them essential for modern data center power management .