PDU Buying Guide | Eaton - Tripp Lite

A Power Distribution Unit (PDU) is a device with multiple outlets designed to distribute power to computers, servers, network switches and other it devices in a rack. PDUs come in a variety of styles that provide everything from basic power distribution to enhanced remote power management.

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How to Choose a PDU for Your Network or Data Center

These are the top 6 factors to consider in your buying decision:

1. Horizontal vs. Vertical Installation

PDUs can be mounted horizontally or vertically inside or outside the rack enclosure:

Horizontal PDUs are installed in the rack and take up one or two rack spaces (1U-2U). Because of their smaller size, horizontal PDUs have fewer outlets.

Vertical PDUs can be mounted on the back or side of the rack enclosure. Deep racks will often leave space for vertical PDUs to be mounted inside the enclosure. Vertical PDUs can have up to 40 outlets.

What is a 0U PDU?
A vertical PDU is also known as a 0U or 'zero U' PDU because it takes up no units of rack space. As the name implies, a vertical PDU mounts to the vertical posts in a rack. Standard 19-inch horizontal PDUs can be mounted vertically outside of the rack if extra space is needed for IT equipment.

What is the best PDU for a 42U rack?
A 42U rack is the most common size of floor-standing server rack. Selecting a PDU for a rack of this size depends on how many devices you plan on installing and the devices' power requirements. If your rack will house densely packed 1U servers, make sure you choose a PDU with ample outlet receptacles, plus some open outlets for future growth. Vertically mounted PDUs are available with up to 48 outlets.

2. Voltage of Your Connected Equipment

In North America, the voltage used to power servers and networking equipment is typically 120V or 208/240V.

Europe and Asia typically provide 230V power.

Be sure that the PDU input plug matches the receptacles of your input power source.

3. Outlet Types

The PDUs outlets should match the plugs on the equipment you'll be connecting. Some PDUs offer a mix of outlet types.

Common PDU Outlet Types

NEMA 5-15R

NEMA 5-20R

IEC-320-C13

IEC-320-C19

NEMA L5-20R

NEMA L5-30R

NEMA L6-20R

NEMA L6-30R

4. Number of Outlets

Select a PDU with more outlets than the number you need to ensure room for future rack growth.

5. Maximum Output Capacity

The total power required by equipment connected to the PDU must not exceed the PDU's maximum load rating (expressed in kVA). In North America, the maximum input and output capacity is limited to 80% (this is referred to as 'agency de-rating'). For example, a single-phase PDU with a nominal voltage of 120V and de-rated input current of 12A (80% of 15A), has a load capacity of 1.44 kVA (120V x 12A).

6. Special Features

Remote management software ' Eaton's PowerAlert® Device Manager (PADM) is the firmware that enables remote management of PDUs equipped with an LX network interface card. The latest version, PowerAlert Device Manager 20.0 (also known as PADM20), provides customizable and intuitive remote management capabilities, expanded maintenance functions and backup and restoration of device configurations. Learn more about PowerAlert.

Automatic device reboots - Eaton PDUs equipped with an LX network interface card include an Auto-Probe feature that automatically detects and fixes network connectivity problems, helping you avoid costly truck rolls for simple reboots. For example, a PDU can be configured to ping a router over the network. If the router fails to respond, the PDU with automatically power cycle the router. Learn more about Auto-Probe.

Environmental monitoring - A monitored or switched PDU's network interface can be used to receive information from environmental sensors connected to the PDU. The sensors monitor ambient temperature and humidity, as well as contact closure status of alarm, security and telecom products. See Eaton's environmental sensor accessories.

What is the best PDU for an A/V rack?
The best PDU for A/V applications depends on the specific application and setup. For a typical single-location application, such as a conference room that is not in use 24/7, does not require networking and is powered off when not in use, a basic rack-mount PDU like Eaton's PDU will be suitable.

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A more complicated A/V system, such as a multi-room system, a digital signage system or a control center, will involve more components and increased demands. Such a system is likely to be operational 24/7/365, will need devices to be monitored and rebooted remotely and will require secured access. An ideal PDU in this case is Eaton's switched PDU model PDUMH15NET.

Introduction

With the global demand for green energy and sustainable development continuing to rise, electric vehicles and new energy applications have become key drivers of the energy transition. In these high-tech fields, Battery Distribution Units (BDU) and Power Distribution Units (PDU) serve as core power management devices, playing critical roles.

BDUs primarily allocate the electric power from EV battery packs to motors and other essential electrical systems, while PDUs are widely used in energy storage systems, charging stations, and industrial power distribution, providing stable power output to various loads.

Given the diverse customer demands and complex application scenarios, customized design of BDUs and PDUs has become increasingly important. Each project has unique requirements in terms of electrical performance, safety, structural design, material selection, and special functionalities, which dictate the product design direction and final performance.

This article provides a comprehensive analysis of the core functions and customization key points of BDUs and PDUs from technical and application perspectives. It also offers guidance on critical information customers need to prepare before project initiation to achieve more efficient and safer solutions.

Core Functions of BDUs and PDUs

As core units in high-voltage electrical systems, BDUs and PDUs are primarily responsible for power distribution, protection, and monitoring. The implementation of these functions is directly related to the overall safety and reliability of the equipment. Below is a detailed analysis of their key functions:

1. Power Distribution

Power distribution is the primary task of BDUs and PDUs, and their design must consider dynamic load characteristics and power demands across various operating scenarios.

BDU Power Distribution

BDUs distribute power to multiple onboard electrical devices (e.g., Motor Control Units [MCUs], air conditioning systems, and Power Conversion Units [PCUs]). The design must focus on the peak and continuous power demands of each device to avoid operational anomalies or system efficiency reductions due to uneven load distribution.

PDU Power Distribution

PDUs, often used in energy storage and industrial power systems, aim to allocate energy from batteries or grids to multiple terminal devices. To achieve efficient distribution, PDUs require flexible multi-port designs and support for independent regulation of multiple current pathways to meet diverse load demands.

2. Protection Functions

Protection functions are essential for ensuring system safety and are a key focus for customers in BDU/PDU selection and design.

• Short-Circuit Protection: High-voltage fuses and contactors rapidly disconnect the current to prevent short-circuit faults from damaging the equipment or system.
• Overcurrent Protection: When load current exceeds the rated range, the circuit is disconnected via contactors or fuses to avoid equipment overload.
• Overtemperature Protection: High currents generate heat that can damage circuits. BDUs/PDUs typically include temperature sensors to monitor device temperatures in real time, ensuring safe operating temperatures.

3. Monitoring Functions

Advanced BDUs and PDUs are not only power distribution devices but also integral parts of intelligent power management systems.

• Real-Time Parameter Monitoring: Integrated sensors measure key parameters such as voltage, current, and temperature, and communicate with system management units (e.g., Battery Management Systems [BMS] or Energy Management Systems [EMS]) to provide comprehensive operational status oversight.
• Fault Alerts: When abnormal parameters (e.g., overvoltage, overcurrent, or overtemperature) are detected, the system issues warning signals and executes protection measures based on preset logic.
• Data Recording and Analysis: Some advanced BDUs/PDUs store operational data, enabling fault tracking and performance optimization analysis for customers.

Key Considerations for Customizing BDUs and PDUs

Customized BDU and PDU designs are tailored to specific needs, making the process both complex and diverse. The following key factors require particular attention during the design phase:

1. Electrical Specifications

Electrical specifications form the foundation for BDU/PDU customization, directly affecting equipment performance and compatibility.

• Rated Voltage and Current: Customers should specify the system's rated voltage range (e.g., 300V, 800V, or higher) and provide maximum and continuous current requirements.
• Power Distribution Requirements: For complex systems, precise planning of power distribution across output ports is critical. For example, in a multi-port PDU, each port's current limit and power demand must be clearly defined to ensure rational and efficient distribution.
• Transient Current Capability: Electric vehicles may experience high transient currents during startup or acceleration. Custom BDUs must ensure that contactors and fuses can withstand these transient surges.

2. Safety

Safety is a non-negotiable requirement in BDU/PDU design, particularly for high-voltage electrical systems.

• Electrical Isolation: Effective isolation between high- and low-voltage sections is essential to prevent system and personnel hazards under fault conditions (e.g., short circuits or overvoltages).
• Redundant Protections: Redundant protection mechanisms, such as combined fuse-contactor protection, ensure safe operation even in the event of single-point failures.
• Certifications and Standards: Compliance with international and industry standards (e.g., ISO for functional safety and UN R100 regulations) is critical to meet safety and regulatory requirements across markets.

3. Structural Design

Compact and efficient structural design is especially important for EVs and new energy applications.

• Modular Design: Modular designs offer greater flexibility, allowing customers to expand functionalities from basic to advanced versions by adding or removing modules.
• Thermal Management: Effective thermal management is fundamental for reliable operation under high-power conditions. Options such as natural convection, forced-air cooling, or liquid cooling can significantly lower device temperatures and extend lifespan.
• Environmental Adaptability: For specific scenarios (e.g., high humidity or vibration), designs must meet specific protection levels (e.g., IP67 or higher).

4. Material Selection

High-performance materials are key to ensuring BDU/PDU safety and reliability.

• Insulation Materials: High-dielectric strength and high-temperature resistance materials (e.g., polyimide or ceramic-based materials) are critical for safe operation.
• Conductive Materials: Premium copper or silver-plated conductors reduce resistance losses and improve system efficiency.
• Housing Materials: High-strength aluminum alloys and engineering plastics provide excellent protection and reduce overall weight.

5. Custom Functionalities

BDUs/PDUs can incorporate additional custom functionality modules based on customer needs:

• Communication Interfaces: Support for multiple communication protocols (e.g., CAN, Ethernet, RS485) enables seamless integration with external management systems.
• Remote Monitoring: Real-time device monitoring and remote control through cloud platforms or local systems.
• Special Protection Features: Additional protection modules for extreme conditions, such as high-temperature or high-load scenarios.

Critical Information Customers Must Provide

To facilitate customized BDU/PDU design, customers should provide as much detailed information as possible before project initiation. This information directly impacts the development of design plans and product performance optimization.

Application Scenarios

Describe the practical application scenarios of the device, such as EV power systems, energy storage systems, or industrial power systems.

Rated Parameters

Include rated voltage, rated current, and peak current parameters.

Load Characteristics

Explain the type, quantity, and power requirements of connected loads.

Environmental Requirements

• Temperature Range: Operating and storage temperature range.
• Protection Levels: Dustproof, waterproof, and shockproof ratings (e.g., IP67).
• Special Environments: Indicate if there are extreme conditions like high humidity, salt spray, or high vibration.

Functional Requirements

• Monitoring and Communication: Specify requirements for parameter monitoring, data storage, or communication interfaces (e.g., CAN, Ethernet).
• Protection Features: Indicate if additional protection features like overvoltage or reverse current protection are needed.
• Custom Modules: Specify additional functionality, such as remote control or auxiliary power interfaces.

Certifications and Compliance

Provide relevant certification or standard requirements based on the target market or industry, such as:

• International Standards: ISO functional safety certification, UN R100 regulations.
• Regional Certifications: UL certification for North America, CE certification for Europe.
• Customer-Specific Standards: Internal enterprise requirements or testing standards.

Project Schedule

To ensure timely delivery, customers should clarify project timelines:

• Sample Delivery: Expected timeline for sample delivery.
• Mass Production Plans: Estimated timeline for mass production and initial demand.
• Project Phase: Current project stage (concept design, engineering validation, mass production readiness, etc.).

Conclusion

Customizing PDUs and BDUs is a complex and critical process requiring professional technical teams and extensive industry experience. By defining requirements, providing detailed information, and maintaining effective communication with suppliers, customers can obtain electrical solutions tailored to their system needs.

HIITIO New Energy is committed to delivering efficient, safe, and customized PDU and BDU solutions. For inquiries or further information, please visit our website or contact our sales team directly. We look forward to collaborating with you to advance industry development!

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