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RPS425DC1U Rugged Power Supply

  • Compact 1U, 18-36VDC power supply w/ ATX output
  • 273.5 mm x 101.6 mm x 41.4 mm footprint
  • Modular electrical output identical to Seasonic SS-460H1U including cables and mounting holes
  • Tested to MIL-STD-461, and DO-160, Section 21, Cat M
  • Tested to MIL-S-901 and MIL-STD-810, Method 514 , Proc. I
  • Convection cooled design relies on internal long-life fans

The Power of Innovation

Introducing the world's only MIL-STD/RTCA qualified ATX modular power supply, the RPS425DC1U. This 425W power supply is 70 in3 of volume, and offers big power in a small package.

Field Tested, Battle Proven

The Crystal Group 425W 1U DC Power Supply has logged thousands of hours of mission critical performance in environments that demand superior EMC performance.

High Reliability at a Fraction of the Cost

Innovative packaging techniques and attention to the important details makes our power supply run cooler and perform at wider temperature extremes. Design approach limits deflection and extends circuit board solder joint life. We provide power, in a rugged package, with exceptional life at a fraction of the cost.

Testing Standards *register to download for certification reports MIL-STD-810

Operational Temperature, Method 501/502 Procedure I/II -40°C to +55°C
Storage, Method 501, Procedure I/II -55°C to +85°C
Humidity, Method 507, Procedure II 240 Hour with humidity kit
Altitude, Method 500 12,500ft operation, 40,000ft transport
Vibration, Method 514, Procedure I 4.43 GRMS, 5-2000Hz, 60 min/axis
Shock, Method 516, Procedures I/V 20g, 11msec--functional shock; 40g, 11msec crash hazard shock


Grade A, Class III, Type A


EMC, CE102 (conducted) & RE102 (radiated) emissions


RTCA DO-160 Section 21, Category M

Mechanical fits into a 1U chassis and up

Height 1.63" (4.14 cm)
Width 4.0" (10.16 cm)
Depth 10.75" (25.4 cm), 11.75"(28.85 cm) with connector
Weight 3.85 lbs. (1.75 kg)

Electrical Specifications

Inrush current, cold start 40 Amps typical, 50 Amps Max @ 500 us
Efficiency, 36VDC, full load 79% typical
Efficiency, 24VDC, full load 80% typical
Efficiency, 18VDC, full load: 78% typical
Dielectric withstand, input to frame/ ground 500 VDC 1 Min
Dielectric withstand, input to output 500 VDC 1 Min
Line regulation ±1%
Load regulation ±1%
Cross regulation ±1%
Ripple/ noise ±1%


Dual fan, active cooling, PWM controlled


MIL-DTL-26482, box mount, 5 pin, size 16 shell, olive drab, CT2-16S-8PS