Unitron AC 400 Hz GPUs: Powering Aircraft Ground Operations
Key Takeaways
- Aircraft use 400 Hz AC power rather than standard 50/60 Hz because the higher frequency supports smaller, lighter motors and transformers, more efficient power conversion, and more stable voltage for sensitive onboard electronics.
- Unitron has been manufacturing aviation-grade ground power equipment since 1955, focusing on solid-state technology, rigorous quality standards, and designs that prioritize efficiency and environmental performance.
- The 45 kVA model serves smaller aircraft and regional jets with a compact, maneuverable form factor and optional 28V DC output. The 90 kVA handles larger commercial aircraft with higher power demands and is available in mobile or trailer-mounted configurations.
- Both models include self-diagnostic systems for proactive maintenance, modular design for easier servicing, remote control capability, and low-noise, fuel-efficient operation.
- PJi is an authorized Unitron distributor and service center, offering stocked parts inventory, expert technical support, competitive pricing, and flexible financing for the full Unitron GPU lineup.
Reliable ground power is foundational to safe, efficient aircraft operations. Whether supporting pre-flight checks, cabin conditioning, avionics testing, or auxiliary loads, a dependable ground power unit (GPU) keeps aircraft ready for service without drawing on onboard batteries or running the APU unnecessarily.
Unitron has been designing and manufacturing aviation-grade ground power equipment since 1955, and its 400 Hz AC GPU lineup remains among the most trusted in the industry. In this article, we'll explore why 400 Hz power is the aviation standard, what sets Unitron's 45 kVA and 90 kVA models apart, and why PJi is the right partner for purchasing and servicing this equipment.
Why Do Aircraft Use 400 Hz Power?
Most commercial facilities use 50 Hz or 60 Hz electrical power, but aircraft rely on 400 Hz AC for onboard systems and equipment. The higher frequency offers several practical advantages for aviation applications:
400 Hz motors and transformers are significantly smaller and lighter than their 50/60 Hz equivalents, contributing to overall aircraft weight savings. The higher frequency also enables more efficient power conversion, allowing compact units to deliver high output. And because 400 Hz power provides more consistent, stable voltage, it supports reliable operation of sensitive onboard electronics – an important consideration in modern aircraft with complex avionics systems.
Unitron's Legacy of Innovation
Unitron has spent more than 70 years pushing the boundaries of GPU design and manufacturing. From early ground power systems to today's advanced solid-state units, the company has consistently prioritized performance, safety, and environmental efficiency. Its rigorous quality control and engineering standards have made it a preferred choice for airlines, MROs, FBOs, and military operators worldwide.
Unitron 400 Hz GPU Models: 45 kVA and 90 kVA
Unitron's 400 Hz GPU lineup includes models scaled for a range of aircraft types and operational environments. Two of the most widely used are the 45 kVA and 90 kVA units.
45 kVA
The 45 kVA unit is well-suited for smaller aircraft and regional jets. Its compact, maneuverable form factor makes it easy to position on busy ramps and in tight hangars. The unit delivers reliable 400 Hz AC power with an optional 28V DC output for additional versatility, and features advanced solid-state technology for improved efficiency and reduced maintenance requirements.
90 kVA
The 90 kVA unit is built for larger aircraft and commercial jets, providing ample power for pre-flight checks, cabin conditioning, and high-demand auxiliary loads. It is available in both mobile and trailer-mounted configurations and incorporates advanced diagnostic and monitoring systems for enhanced safety and performance visibility during operation.
Features That Support Operational Efficiency
Both models share a set of practical features that go beyond basic power delivery. Built-in self-diagnostic systems help identify potential issues before they affect operations, supporting proactive maintenance and minimizing unplanned downtime. A modular design simplifies servicing and reduces repair costs. Remote control capability allows safe, convenient operation from a distance, and many Unitron GPU models are engineered for low noise emissions and fuel efficiency – an increasingly important consideration for airports with environmental commitments.
Why Source Your Unitron GPU Through PJi?
As an authorized Unitron distributor and service center, PJi offers more than just a transaction. Our technicians carry in-depth knowledge of Unitron GPU systems and are equipped to provide expert setup guidance, ongoing support, and maintenance service. We maintain a stocked inventory of Unitron parts and equipment to reduce wait times for repairs and replacements, and we offer competitive pricing along with flexible financing options to fit a range of operational budgets.
The Bottom Line
Unitron's 400 Hz AC GPUs deliver the reliability, versatility, and engineering quality that demanding aviation environments require – and the 45 kVA and 90 kVA models cover a wide range of aircraft types and ramp applications. Choosing the right GPU also means choosing the right support behind it.
PJi is your authorized source for Unitron ground power units, with the expertise, inventory, and service capabilities to back your investment over the long term. Contact our aviation specialists today by phone, email, or live chat to find the right Unitron GPU for your operation.
