Electrocube, design manufacturer of electronic components

Custom Transformer Rectifier Units (TRU)

For Military and Commercial Aircraft Application

The Electrocube Model TR1010 family of TRUs converts aircraft primary AC power to 28 VDC power from a single phase, 115 volt, 400 Hz source.

These lightweight TRUs have been specifically designed for military and commercial aircraft applications. They meet all the exceptional reliability demands and environmental requirements of common commercial and military standards for airborne equipment. Hermetically sealed versions are available.

Electrocube’s many years of experience in manufacturing airborne components assures our design provide the most lightweight product in the industry.

Cooling is provided by thermal conduction via the mounting base plate. No forced air cooling is necessary. The absence of blowers results in high reliability and absolutely maintenance-free operation ensuring a low unit life-cycle cost.

Standard Features:

  • Resistance (bonding resistance): <10 m Ohm/li>
  • MTBF: >50.000 H


  • Military aircraft/li>
  • Commercial aircraft/li>

Output Current:

  • 3 to 20 Amps

Electrical Specifications (typical):


  • Rated Voltage: 115/200 VAC, 1-ph
  • Rate Frequency: 400 Hz and/or frequency wild
  • Voltage Spikes: MIL-STD-704 D
  • Voltage Transients: MIL-STD-704 D
  • Frequency Transients: MIL-STD-704 D

Output (3 Amp Design):

  • Rated Voltage: 28 VDC
  • Rated Power: 84 W
  • Rated Current: 3 A
  • Ripple (Rated Power): 8%

Efficiency: >86% (Rated Power)
Harmonic Content: Max 5% of the Fundamental

Output Characteristic (typical):

a)  UE=115 VAC (Full Load)
     fE=400 Hz ± 7.5%/UA => 25.3 VDC

b)  UE=115 VAC (No Load)
     fE=400 Hz ± 7.5%/UA => 28 VDC

     *other voltages available

Typical Physical Characteristics:
(non-hermetic 3 Amp design)

Dimension: L = 3.90 * H = 2.56 * W = 1.94
Weight: 1.2 lbs.

Environmental Specifications:

Operating Temperature ……… -30°C to 102°C
Momentary: (Air and Mounting Plate Temperature) ………153°C for 2 min.
Storage Temperature ………   -60°C to 90°C
Vibration: Random ……… .22 G rms
……………………………… 10-2000 Hz
……………………………… IAW MIL-STD-810 C
Shock: 40 g. 11 ms
Humidity: 95% IAW
……… RTCA/DO-160
Altitude ……… 10 kPa
Dielectric Resistance ……… > 100 M Ohm

Specifications subject to change without notice


High Current Transformer Rectifier Unit (TRU)

Regulated or Unregulated - Electrocube high current TRUs convert three-phase power to MIL-STD-704 quality DC power. Standard units operate within the most stringent environments and are designed to meet military standards for mission critical equipment.

Design Electrocube’s lightweight aluminum foil transformer technology offer the “lowest weight” product available.

Forced air,internal fan or natural free-air conduction models are available with nominal output current ratings from 20 A to 500 A.

Applications for TRUs include commercial and military aircraft: freighters to fighters, tankers to trainers, helicopters and ground base units.

Input Voltage:

  • Three Phase WYE or Delta Connections

Input Frequency:

  • 400 Hz and/or frequency wild

Output Voltage:

  • Unregulated
  • 28 VDC Nominal
  • 24.0-31.5 VDC Normal
  • Regulated
  • 28 VDC+/-1%

Output Power:

  • 20 to 500 Amps
  • 1400 to 14000 Watts


  • 125% for 5 Minutes
  • 150% for 2 Minutes
  • 200% for 1 Minute
  • 1200% for 1 Second


  • 1.5 V p-p


  • 88% Typical

Power Factor:

  • 0.97 Typical

Harmonic Content:

  • Max 5% of the Fundamental
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