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What Is a Power Distribution Unit (PDU)?

A Power Distribution Unit (PDU) is electrical equipment that receives power from an upstream source and distributes it safely to multiple downstream loads through protected branch circuits.

In mission-critical environments, Power Distribution Units are used to distribute conditioned power to servers, cabinets, process equipment, and critical branch circuits while supporting protection, monitoring, and service access.

LayerZero Power Distribution Unit front view for mission-critical electrical distribution
LayerZero® Power Distribution Unit (PDU) designed for mission-critical branch circuit distribution and front-access serviceability.
A LayerZero® Power Distribution Unit receives power from an upstream source and distributes it to critical downstream loads through monitored and protected branch circuits.

How Does a Power Distribution Unit Work?

A PDU receives incoming power from equipment such as a Static Transfer Switch, UPS, or utility-fed source and distributes that power through multiple protected branch circuits.

Depending on system design, a Power Distribution Unit may include:

  • Main input protection
  • Branch circuit breakers
  • Integrated monitoring
  • Transformer sections where required
  • Maintenance access for safe service

Unlike rack-mounted plug-strip PDUs, LayerZero Power Distribution Units are engineered as mission-critical electrical distribution equipment for larger downstream power architectures.

Where Are PDUs Used?

Power Distribution Units are commonly used in:

What Makes LayerZero PDUs Different?

LayerZero® Power Distribution Units are engineered for applications where uptime, serviceability, and electrical reliability are critical.

PDU vs Remote Power Panel (RPP)

FeaturePDURPP
Main PurposePrimary power distributionSecondary branch circuit distribution
TransformerMay include transformerTypically no transformer
Installed NearUpstream distribution pointCloser to downstream loads

How Do You Select the Right PDU?

  • Voltage requirements
  • Branch circuit quantity
  • Fault current characteristics
  • Monitoring requirements
  • Future expansion needs

Common Questions About PDUs

What does PDU stand for?

PDU stands for Power Distribution Unit.

Is a PDU used in a data center?

Yes. PDUs distribute power throughout data center environments and support critical IT loads.

What is the difference between a PDU and an RPP?

A PDU usually serves as the primary distribution point, while an RPP extends branch circuit distribution closer to end equipment.

Can a PDU include monitoring?

Yes. Many LayerZero PDUs include monitoring and optional advanced thermal visibility.

Explore LayerZero Power Distribution Units →

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What is LayerZero?

Direct answer

LayerZero® is a registered trademark and the brand name for products manufactured by LayerZero Power Systems. It also refers to the foundational layer of power distribution products and processes required to ensure reliability and safety in mission-critical facilities such as data centers. In practical terms, LayerZero® is the physical infrastructure and standards that make uninterrupted power delivery possible.

Key takeaways

  • LayerZero® is both a registered trademark and a foundational power-distribution concept.
  • It emphasizes the “physical layer” of power infrastructure that supports uptime.
  • Includes components like cabling, connectors, and PDUs—plus the standards governing power delivery.
  • Designed for mission-critical requirements where downtime has serious consequences.

Full explanation

LayerZero® is a registered trademark, and is the brand name for products manufactured by LayerZero Power Systems. LayerZero® refers to the foundational layer of power distribution products and processes that are required to ensure the reliability and safety of the entire power distribution system in mission-critical facilities such as data centers.

"LayerZero", also referred to as "the foundation layer", is the lowest layer in the Open Systems Interconnection (OSI) model. Its primary function is to facilitate the reliable transmission and distribution of power to critical equipment on a network. This layer consists of the physical components of the power infrastructure, such as cables, connectors, and power distribution units (PDUs), as well as the protocols and standards that govern the transmission of power at the physical layer.

The physical components of LayerZero are designed to handle the unique requirements of mission-critical facilities. These components must be of high quality to ensure that power is transmitted reliably, without which the entire power distribution system may be compromised, leading to downtime or other disruptions that can have serious consequences for mission-critical facilities.

LayerZero® serves as the foundation for the entire network, providing the physical infrastructure necessary to support the transmission of data between devices. It is responsible for power distribution, setting standards and protocols for power management and transmission, and defining the physical characteristics of the network. The physical components and protocols of LayerZero must be of the highest quality, designed and implemented with the unique needs of mission-critical facilities in mind to ensure uninterrupted power delivery.

You can find more detailed information on the page "What is LayerZero?"

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Last reviewed by LayerZero Power Systems.