When should I choose a 28 VDC GPU?

Choose a 28 VDC GPU when the aircraft requires 28 VDC external power for avionics, maintenance, battery support, or engine start assistance. 28 VDC GPUs are commonly used with legacy helicopters, turboprops, business aircraft, regional aircraft, and many military aircraft applications.

What aircraft ground power products does Unitron manufacture?

Unitron manufactures solid-state aircraft ground power systems, including 400 Hz AC frequency converters, 28 VDC ground power units, 270 VDC aircraft power supplies, combination AC/DC ground power units, onboard frequency converters, cable handling systems, remote control accessories, and related aircraft ground power accessories.

Are Unitron GPUs available as mobile, towable, fixed, or bridge-mounted units?

Yes. Unitron aircraft ground power units are available in multiple configurations depending on the product family and use application. Common configurations include mobile, towable, fixed, and bridge-mounted units for hangars, ramps, flight lines, boarding bridges, and maintenance facilities.

What GPU configuration is best for a hangar?

For hangars, the best GPU configuration depends on aircraft type, output power, cable length, safety requirements, and how often the aircraft position is used. Fixed or bridge-mounted GPUs are preferred for dedicated maintenance bays, while mobile or towable GPUs are preferred when the same unit must be relocatable to serve multiple aircraft positions.

What is the difference between a mobile GPU and a fixed GPU?

A mobile GPU is mounted on wheels, a cart, or a towable frame so it can be moved around the ramp, hangar, or flight line. A fixed GPU is permanently installed in a hangar, gate, bridge, or facility location. Mobile GPUs are best for flexible operations, while fixed GPUs are best for repeated use at a dedicated aircraft parking or maintenance position.

What GPU configuration is best for ramp or flight line use?

For ramp and flight line use, mobile or towable GPUs are often preferred because they can be positioned close to the aircraft. A mobile GPU gives ground crews flexibility when aircraft parking positions change or when one power unit must support multiple aircraft over time.

28VDC Ground Power Unit

Unitron Power Systems and FoxCart 28VDC ground power supply units provide continuous output power for your aircraft from a wide-range of power input levels and can run from 50 or 60Hz sources. The units are available in lightweight mobile or fixed configurations, suitable for either hangar or ramp use. Unitron’s 28VDC GPUs are also used in the design of electrical distribution systems for large civilian and military ships to supply power to the helicopter deck.

NEC 18" Rule: There is the well known “18in rule” that requires there be no electrical connection allowed within the 18in area above the hangar floor known as a Class 1, Division 2 area. This area is considered hazardous because fumes from spilled jet fuel may not have yet dispersed sufficiently to avoid ignition were an arch to occur; in this context, from a loose electrical connection within a mobile power unit (GPU or cart). For a more thorough explanation of this ruling, one can reference Article 513 of the NEC and IEC 60079-10-1 of the European Standard as well as the article available in the below downloads.

Request Info

Choose a configuration below:

FoxCart Mobile

Downloads

FoxCart 1200B

FoxCart 1600B

FoxCart 2000B

NEC 18" Rule - Hangar Safety Article

Product Highlights

FEATURES:

1Ø or 3Ø and 50 or 60Hz Input (Only 1Ø for 1200B)
Multi-tap Input Transformer
Input Circuit Breaker
Output Voltage and Current Monitoring
Front Panel Voltage Adjust – 7 Position
60Hz, 120V Duplex Utility Outlet (Available only at
designated low voltage or high voltage inputs)

OPTIONS:

Soft Start (Limits Output Current to ~1,100A During Starts)
Rough Terrain Wheel Kit
NEC 18" Inch Safety Hazard Clearance Riser Kit

Unitron Mobile/Towable

Downloads

28VDC Mobile

28VDC Towable

NEC 18" Rule - Hangar Safety Article

Product Highlights

FEATURES:

IP55
NEMA 250 - Type 3SX
Certified to UL 1012
Self-diagnostic capabilities for minimizing downtime
Front Panel Summary Fault Indicators
Emergency Power “OFF” Switch
Advanced Integrated Display (AID™) Console
External Communication Port – USB
Internal Communication Ports - RJ45 (Ethernet), RS485 (Modbus), & RS232
Meets NEC 18" Inch Safety Hazard Clearance Regulation
Input High Voltage Transient Protection
Output Current Limit Adjust from 150 to full rated current
Voltage & Current Monitoring
Control Panel Voltage Adjust
Elapsed Time Meter
Multi Language Display

Unitron Fixed

Downloads

28VDC Fixed Horizontal

28VDC Fixed Vertical

NEC 18" Rule - Hangar Safety Article

Product Highlights

FEATURES:

IP55
NEMA 250 - Type 3SX
Certified to UL 1012
Self-diagnostic capabilities for minimizing downtime
Fixed and Bridge-Mounted Configurations
Front Panel Summary Fault Indicators
Emergency Power “OFF” Switch
Advanced Integrated Display (AID™) Console
External Communication Port – USB
Internal Communication Ports - RJ45 (Ethernet), RS485 (Modbus), & RS232
Input High Voltage Transient Protection
Output Current Limit Adjust from 150 to full rated current
Voltage & Current Monitoring
Control Panel Voltage Adjust
Elapsed Time Meter
Multi Language Display

Unitron UltraLite

Downloads

UltraLite Mobile

UltraLite Fixed Horizontal

UltraLite Towable

UltraLite Fixed Vertical

NEC 18" Rule - Hangar Safety Article

Product Highlights

FEATURES:

IP55
NEMA 250 - Type 3SX
Certified to UL 1012
Self-diagnostic capabilities for minimizing downtime
Front Panel Summary Fault Indicators
Input P.F. Correction
Input Voltage Auto Ranging System
Assured plug head voltage regulation up to 100 feet of output cable
≤ 5% input current distortion
Front Panel Summary Fault Indicators
Emergency Power “OFF” Switch
Advanced Integrated Display (AID™) Console
External Communication Port – USB
Internal Communication Ports - RJ45 (Ethernet), RS485 (Modbus), & RS232
Meets NEC 18" Inch Safety Hazard Clearance Regulation
Input High Voltage Transient Protection
Output Current Limit Adjust from 150 to full rated current
Voltage & Current Monitoring
Control Panel Voltage Adjust
Elapsed Time Meter
Multi Language Display

28VDC

Unitron Power Systems and FoxCart 28VDC ground power supply units provide continuous output power...

LEARN MORE

270VDC

Unitron 270VDC aircraft power supply units are available in ratings from 36kW to 72kW in mobile, towable and fixed configurations...

LEARN MORE

Combo 400HZ/28VDC

Unitron’s dual output, solid-state, AC/DC Ground Power Unit supplies simultaneous 400Hz AC and 28VDC power from a single...

LEARN MORE

Combo 400HZ/270VDC

Unitron’s dual output, solid-state, AC/DC Ground Power Unit supplies simultaneous 400Hz AC and 270VDC power from a single...

LEARN MORE

ONBOARD PS Series

Unitron’s PS-94 Series programmable power supply operates from any standard...

LEARN MORE

HVAC

FoxCart’s FoxAir® HVAC units provide a convenient and reliable portable solution for...

LEARN MORE

CABLE HANDLING

Unitron offers two Cable Handling Solutions - URV Series Cable Retriever and JetLinkSys...

LEARN MORE

REMOTE CONTROL ACCESSORIES

Depending on configuration, the Remote Control Unit (RCU) and Remote Control...

LEARN MORE

ACCESSORIES

We have many accessories available for you. Please see all...

LEARN MORE

SFLEDS

Unitron's combination 400Hz/28VDC Super Flight Line Electrical Distribution Systems (SFLEDS)...

LEARN MORE

AVIONICS

Unitron offers the FLX-3050B Antenna System and DBTI-2000 Battery Temperature Indicator System...

LEARN MORE

400HZ

Unitron's 400Hz frequency converters contain standalone power ratings from 20-kVA to 180kVA...

LEARN MORE

SERVICE & SUPPORT
24/7 Worldwide Availability

ENGINEERING DESIGN

REQUEST MANUAL

REQUEST SUPPORT

customer-service-executives-working-at-office-TB3924Y-resized

We are committed to providing our customers with superior service and support, beginning with the sale and installation of the product, and continuing throughout the life of the equipment. Unitron products are known for their outstanding reliability and performance. Experienced customer service technicians are available to perform diagnostic tests and restore proper operation as quickly as possible - typically within 24 hours of a service call.