Tronair 112850S0200 Single-Output 28V DC Aircraft Rectifier/Ground Power Unit (GPU) – 50 Hz

This model is configured for 50 Hz input power and a single-output cable, with a standard 100 ft (30.5 m) input cable. Its 28.5 VDC output supports up to 600 amps continuous and 2,000 amps peak, making it suitable for both parked aircraft power and APU starting. The unit’s design emphasizes reliability, safety, and compliance with international power standards.

The rectifier is suitable for a wide range of aircraft, including business jets, regional aircraft, and commercial narrow- or wide-body models that operate on 28V DC systems. It can deliver stable ground power for avionics checks, lighting, cabin systems, and environmental controls. Its peak amperage also makes it capable of assisting with APU and engine starts.

Designed for portability, the GPU’s large 9” (23 cm) rigid rubber and lockable swivel casters make it easy to position in a hangar or on the ramp. At around 700 lbs (318 kg), the unit is heavy but manageable with its caster system. The low-profile frame also allows it to fit under most aircraft wings during operation.

The 112850S0200 includes multiple layers of protection: input and output over/under voltage, output overcurrent, input phase loss detection, and transformer/SCR overtemperature protection. These safeguards protect both the aircraft’s electrical system and the rectifier itself. LED indicators provide diagnostic feedback to simplify troubleshooting and enhance operational safety.

The Tronair rectifier is designed for low-noise performance, around 20 dB, which is quieter than most hangar equipment. This makes it well-suited for indoor environments where technicians need to communicate effectively. Quiet operation also reduces overall noise pollution in busy maintenance areas.

The unit employs an energy-saving thermal control cooling fan that engages only as needed, based on system temperature. This helps extend component life, reduce unnecessary energy consumption, and keep operating noise low. The design balances efficiency with reliable cooling for long service life.

The 112850S0200 comes with a 20-ft (6.1 m) single-output cable equipped with an AN 2551 aircraft DC plug for standard compatibility. The input side includes a 100-ft (30.5 m) power cable as standard, offering extended reach in hangar setups. Optional configurations for shorter or dual-output cables are available in other models within the same series.

The unit is powder-coated and corrosion-resistant, designed to endure the environmental conditions common to hangars and ramp operations. This finish helps protect against Skydrol, moisture, and other contaminants. Combined with rugged construction, it ensures long-term reliability with minimal maintenance.

The control panel features simple, user-friendly switches and indicators for powering on, adjusting current limits, and monitoring output. LED status lights double as diagnostic tools, making it easier to identify abnormal conditions. These intuitive controls reduce operator training requirements and improve efficiency during maintenance tasks.

The single-output version, like the 112850S0200, delivers power through one cable and is ideal for operators servicing a single aircraft at a time. The dual-output models provide two cables, which can power multiple aircraft or provide redundancy for high-demand operations. Choosing between the two depends on your operational environment and fleet size.

Routine maintenance typically involves checking cables, connectors, and cooling fans for wear or damage and keeping the unit clean and free from debris. The built-in diagnostics and protective features minimize the need for major servicing. Tronair also provides factory-direct support and worldwide service for calibration, repair, and parts replacement.

Yes. With input flexibility between 200V and 480V ±10% and compatibility with 50 Hz, three-phase power, the rectifier is designed to meet a wide range of global power standards. This makes it especially useful for international operators and MROs that service aircraft in different regions.