ECU-550: Compact, Light, Rugged Temperature Management for Electronics Cooling

  • 550 W of cooling at rated conditions
  • Fully qualified to MIL standards when installed in a qualified enclosure:
    • MIL-STD-810
    • MIL-STD-1275
    • MIL-STD-461
  • NSN# 4120-01-590-1647 Environmental Control System
  • Compatible with most operational transit cases
  • Provides cooling, heating and dehumidification to electronics enclosures
  • Operates on 28 VDC power
  • Qualified for operation on moving vehicles
  • Prevents dust or contaminants from entering the enclosure when installed in an appropriately designed enclosure
  • 4 times more efficient, 5 times lighter, and 3 times smaller than competing thermoelectric systems

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Product Description

The ECU-550 enables electronics systems to be deployed effectively in hot, challenging environments.Over 3,000 ECU-550 systems have been deployed to US Department of Defense applications worldwide and the product is available for overseas sales as well.


Nominal Cooling Capacity550 Watts
Heating Capacity300 Watts (Resistive)
Operating Ambient Temperature Range-40°C to 60° (-40°F to 140°F)
Storage-40°C to 71°C (-40°F to 160°F)
Maximum Power Draw525 Watts (at 32 VDC)
420 Watts (at 28 VDC)
Voltage22 - 32 VDC
Maximum Current16.4 Amps (at 32 VDC)
15.0 Amps (at 28 VDC)
Altitude4.6 km (15,000 ft)
Humidity Control70% RH between 50°F and 140°F
Orientation<30° from flat
Military StandardsMIL-STD 810
Weight9.1 kg (20 lb)
Dimensions H x W x D22.8 x 47.0 x 17.0 cm
(9.0 x 18.5 x 6.7 in)


ECU-550 brochure
ECU-550 installation and operations instructions
Aspen success story for the ECU-550
Vapor compression vs Thermoelectric Chillers
Army Commercialization Report