AI server racks demand a significant amount of power, necessitating a stable and reliable power supply 24/7. Any fluctuations or disturbances in the power feed to these high-value assets can have a serious effect on their ability to support advanced computing workloads. Therefore, ensuring that your intelligent rack PDU (Power Distribution Unit) meets these demands is a critical consideration for data center operators.

Where once a rack PDU was considered a basic power strip to power 10-20 kW per rack, in the era of AI, high-capacity intelligent PDUs are essential for managing and monitoring rack densities that increasingly exceed 70-100 kW per rack. High-density data centers, hyperscalers, and colocation facilities not only require PDUs with high-density designs, but also advanced power management, metering, and monitoring capabilities. These features help prevent circuit overloads, safeguard equipment, and optimize energy efficiency.

So, what functionalities should operators consider when selecting a high-density rack PDU for their AI and HPC infrastructure?

High-Density Power and Outlets

In response to growing power demands, operators should choose high-density PDUs capable of supporting higher power loads. Additionally, the form factor is critical to ensure these PDUs fit seamlessly into densely packed rack environments while accommodating increasing power requirements.

For example, Legrand’s Raritan PX4 Rack PDUs and Server Technology PRO4X PDUs feature HDOT Cx (High Density Outlet Technology) hybrid IEC C13 and C19 outlets. This design allows C14 and C20 power cables to be installed in a single flexible outlet, maximizing the number of outlets in a single PDU and the physical rack space available to support compute-intensive applications.

These advanced rack PDU solutions are designed to meet even the most demanding power needs with customizable options including form factor, breaker count, outlet type, and more:

• Voltages from 208V to 480V AC
• Input current from 16A to 125A
• Power Capacity of 10 kW to 90 kW+
• Form factor options from vertical 0U and horizontal 1U to 3U
• Up to 24 20A 10kAIC hydraulic-magnetic circuit breakers

Universal Input for Dynamic Power Configurations

Given the fluctuating power demands of AI workloads, data centers often face changes in their input power infrastructure or power density. Traditionally, PDUs were purchased based on an existing set of requirements, meaning they had to be swapped out as those requirements changed. However, the PX4 and PRO4X PDUs feature a Universal Input option that supports both single-phase and three-phase Legrand Universal Input cord configurations. This one-size-fits-all feature supports future requirements changes without the need for swap-outs. This flexibility saves time and money for data centers.

Advanced Power Quality Monitoring & Management

AI servers can contribute to power quality issues, such as harmonic distortions, or current variations, leading to unplanned downtime or stranded capacity. To prevent downtime before it escalates, the PX4 and PRO4X Rack PDUs offer a comprehensive set of intelligent features, including real-time visibility, reporting, and alerting of power metrics and events. Key features include:

• Integrated ±0.5% energy metering accuracy
• Advanced power quality monitoring, covering neutral voltage, total harmonic distortion, and voltage dip and swell metrics at both the PDU's inlet and outlets
• Circuit breaker trip forensics with waveform capture
• Plug-and-play rack management accessories

By analyzing the collected data, technicians can identify power quality issues at the rack level and determine their causes. This insight enables data center operators to create effective power quality mitigation plans that align optimization strategies with sustainability goals.

Environmental and Security Monitoring

With increasing AI workloads, data centers experience higher power consumption and heat generation, which can impact cooling efficiency and operational costs. To optimize cooling and prevent energy waste, it’s essential that rack PDUs can monitor environmental factors like temperature, humidity, and airflow.

The PX4 and PRO4X PDUs offer a wide range of rack-based, plug-and-play solutions for managing critical IT devices effectively. These include:

• Environmental and security sensors
• Electronic smart door locks
• Asset management tags and sensors

By using sensors to monitor these conditions, data centers can protect equipment from damage and enhance security by detecting misuse or suspicious activities.

Cybersecurity

Today’s rack PDUs are designed as intelligent, networked devices. However, this connectivity also introduces new cybersecurity risks, and many legacy PDUs still lack essential protections and remain at risk.

Legrand has integrated advanced cybersecurity features into its PX4 and PRO4X intelligent rack PDUs, powered by the Xerus™ firmware platform, including:

• Secure Boot: This feature ensures that only verified firmware runs on your PDU, preventing tampering and malicious code execution.
• Vulnerability Testing (VAPT): Each firmware version undergoes thorough internal and third-party testing, including penetration testing with industry-standard tools such as Nessus.
• Encrypted Communications: All devices utilize AES 128b/256b encryption, along with firewall support and robust password policies.
• SB 327 & NISTIR 8259 Compliance: The PDUs meet or exceed the requirements of leading security regulations for IoT devices.
• Stringent Internal Standards: All connected products adhere to the Legrand security policies for IoT devices.
• Frequent Firmware Updates: There are two major and six minor updates each year, with urgent patches delivered promptly.
• Customizable Alerts: Intelligent features such as SmartLock™ and webcam triggers provide real-time visual alerts and automated response protocols for unauthorized access events.

Legrand: Meeting Your AI Demands

As AI adoption continues to grow, Legrand’s industry-leading, high-density PDUs will help data centers manage the transition to significantly higher capacities, providing the flexibility and intelligence required to support evolving power infrastructures.

To learn more about our intelligent rack PDUs and their capabilities, visit our website here.

Access Our White Paper on Solving Power Quality Pain Points

Download our White Paper: Solving Power Quality Pain Points to gain a deeper understanding of why measuring total harmonic distortion (THD) is essential to modern data centers and how having circuit breaker trip forensics available at the rack PDU makes sense to address several data center power pain points.