• 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 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 2 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. Download the ECU- 550 brochure for more information.


Cooling Capacity
Heating Capacity

550 Watts
300 Watts
18.5 in. x 9.0 in. x 6.7 in. (W x H x L)
20 Lbs.
28 V DC (22 to 32 V DC)

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