Delta Sets Global Benchmark with First 80 PLUS® Ruby-Certified 5,500W Server PSU from Thailand

Bangkok, Thailand – May 8, 2025 – Delta Electronics (Thailand) PCL. a global leader in power management and smart green solutions, proudly announces that its 5,500W high-end redundant server power supplies, manufactured in Thailand, are the first in the world to receive the 80 PLUS® Ruby certification.

Mr. Victor Cheng, CEO of Delta Electronics (Thailand), stated “This achievement marks a proud milestone for both Delta and Thailand. Being the first in the world to receive the 80 PLUS® Ruby certification reinforces our leadership in high-efficiency power innovation and showcases Thailand’s vital role in delivering cutting-edge, sustainable technologies to the global market. Ruby certification is more than a technical accomplishment, it represents a forward-thinking standard for responsible digital growth. This milestone reflects Delta’s unwavering commitment to performance, reliability, and sustainability, all proudly built in Thailand.”

To meet Ruby standards, a power supply must deliver at least 96.5% efficiency at 50% load and maintain a power factor (PF) of 0.96 or above. Delta’s PSUs exceeded these standards with groundbreaking peak efficiency as high as 97.5%*, and a power factor of 0.99 under full load. Delta has drawn upon its superior prowess in soft-switching technology and advanced circuit topology, while also applying third-generation power semiconductor technology to not only surpass the stringent requirements of the 80 PLUS Ruby certification, but also to deliver a 59% increase in power density at 51W/inch³.  

Built in Thailand. Engineered for the Future.

Designed in collaboration with Delta’s global design centers and manufactured at Delta’s facilities in Thailand, the 5,500W PSUs, available in 19-inch (1RU) and 21-inch (1OU ORV3) configurations, are tailored to deliver exceptional power density, energy savings, and thermal performance in compact rack units for high-performance computing in AI data centers.

Key innovations include:

• The soft-switching technology and an advanced circuit topology are both adopted during the Power Factor Correction (PFC) stage, boosting overall power efficiency, thermal performance, and optimal conversion.

• Third-generation semiconductors, such as modern silicon SiC or GaN are utilized to achieve higher efficiency criteria for Ruby.
• The current 5,500W redundant power supplies achieve a 51W/inch³ power density, increasing 59% over the previous 3,000W model's 32W/inch³.

These technologies collectively ensure maximum power conversion with minimal energy loss—critical for modern computing environments where every watt counts.

Delta’s certified PSUs enable customers to enhance energy efficiency, lower carbon emissions, and optimize power usage contributing directly to global sustainability goals. As data centers expand in scale and complexity, Ruby-level efficiency has become a strategic priority, extending far beyond technical performance alone.

Powering the Path Ahead

This milestone aligns with Delta’s mission: “To Provide Innovative, Clean, and Energy-efficient Solutions for a Better Tomorrow. As part of this mission, Delta continues to invest in next-generation PSU technologies that not only push the boundaries of efficiency and performance but also support the global transition toward low-carbon, intelligent infrastructure. Through sustainable innovation and smart manufacturing, Delta is committed to powering the digital future responsibly and reliably.

(*) Note: Peak efficiency of 97.5% achieved at 277V and at 50% power load. Also, power factor up to 0.99 achieved at half and full load.