Exploring the Different Types of PDUs: Metered, Switched, and More

Power distribution is a fundamental requirement of any data center. Organizations need an effective means of bringing power from the primary supply to individual devices in racks and cabinets. That’s the role of the power distribution unit (PDU). See our blogs on “what is a PDU?” and “how does a PDU work?” for more information.

A rackmount PDU is essentially a power strip with the capacity to handle the power load of IT equipment. It mounts vertically or horizontally in the rack or cabinet to save space and allow for easier administration.

Increasingly, PDUs also offer “smart” features that facilitate remote management. Demand for intelligent PDUs is driving market growth, which Fortune Business Insights expects to exceed 13 percent through 2028.

Server Rack PDU Types

When selecting a PDU, data center staff should consider the voltage of the main power source, whether it supplies single- or three-phase power, and the type and quantity of outlets required to support the IT equipment. They should also ensure that the power load doesn’t exceed the PDU’s rated capacity. See our PDU buying guide for more information.

Beyond these basics, it’s a question of whether additional features might be useful. Here’s a look at some of the different types of PDU options.

Monitored and Metered PDUs

A metered PDU measures the power being consumed by individual outlets or the PDU as a whole to help prevent circuit overloads. Some of the data provided include voltage, current, active power, apparent power, and energy. Monitored PDUs connect to the network so that administrators can monitor the data remotely versus reading it on a local display. High-quality monitored PDUs provide “billing-grade” accuracy, which means that the data is accurate within +/- 1%.

Switched PDUs

A switched PDU allows IT staff to control power outlets remotely through a network interface. Administrators can power cycle a failed piece of equipment without an onsite visit. They can also power down noncritical equipment in an outage to extend UPS battery life for critical equipment and stage power-up sequences when electricity is restored to prevent overloads. In addition, switched PDUs enable administrators to lock out PDU receptacles that aren’t in use to prevent unauthorized hardware from being connected.

Managed PDUs

The term “managed” is often used interchangeably with “switched” or to apply generally to all “smart,” network-connected PDUs. Because manufacturers use varying terminology, it’s important to look at the features and specifications before making a purchase.

Universal PDUs

A universal PDU features a seven-pin input connector that allows for the connection of interchangeable input power cables. This gives organizations the flexibility to adapt the PDU to the available facility power. The same model PDU can be used in all locations worldwide regardless of the input power supplied in that region. The removable power cord also makes it easier to install the PDU in a rack with limited space.

TAA-Compliant PDUs

PDUs that are compliant with the U.S. Trade Agreement Act (TAA) were made in the U.S. or a designated trading partner country. TAA-compliant products qualify for General Services Administration contracts for federal procurement. Suppliers may be required to prove that their products meet TAA requirements. See our blog on TAA certification and compliance for more information.

High-Quality Rackmount PDUs from Enconnex

Enconnex offers a variety of rackmount PDUs for different needs and budgets. Our products include basic PDUs, universal PDUs, and network-connected PDUs that can be purchased with sensors for temperature, humidity, and leak detection.

We have PDUs in stock in multiple locations worldwide, enabling us to meet our customers’ delivery requirements and offer a better price point. We are also getting ready to launch a new line of TAA-compliant, made-in-America basic PDUs. Contact our power specialists to learn more about our PDUs for sale. We’ll help you find the perfect solution for your environment and use case.