Pricing & AvailabilityDC4-185 SERIES

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  • High Efficiency
  • Advanced SMT Design   
  • Universal 85-264 VAC Input
  • 2 Year Warranty
  • One to Four Outputs
  • Fits 1U Applications
  • Compact 4.2" x 7.0" x 1.5" Size
  • Size and Pin compatible with REL-185 Series
  • EN 60950 ITE Certification
  • EN 60601-1 Medical Certification
  • Optional Chassis and Cover

Total Output Power at 50oC 135W  Convection Cooled
185W300 LFM Forced Air
Output Voltage Centering (50% load) Output 1:    +/-0.5% 
Output 2:+/-5.0%
Output 3:+/-5.0%
Output 4:+/-5.0%
Output Voltage Adjust Range Output 1: 95 - 105%
Load Regulation Output 1: 0.5% (10-100% load change)


Output 2: 5.0% (20-100% load change)
 (4001,4,5,2001 Models) 10.0% (20-100% load change)
 (4002,3Model) 15.0%
 Output 3: 5.0%
 Output 4: 5.0%
Source Regulation Outputs 1 - 4: 0.5%
Cross Regulation Outputs 2 - 4: 6.0%
Output Noise Outputs 1 - 4: 1.0%
Turn on Overshoot None
Transient ResponseOutputs 1 - 4 
Voltage Deviation 5.0%
Recovery Time  500MicroS
Load Change50% to 100%
Output Overvoltage Protection Output 1: 110% to 150%
Output Overpower Protection 110-160% rated Pout, cycle on/off, auto recovery
 Start Up Time 5 Seconds
Input Voltage Range 36-72 VDC

Input Under-Voltage Lockout

Turn-On Voltage 29.0-35.0 VDC
Turn-Off Voltage 28.0-34.0 VDC
Input Overvoltage Shutdown 77.0-85.0 VDC
Maximum Input Current 7.0 A
Reflected Ripple Current 5 %
Efficiency 84% Typ., Full Power, 48VDC, varies by model
Ambient Operating Temperature Range 0o C to + 70o C Derating: See Power Rating Chart
Ambient Storage Temp. Range - 40o C to + 85o C
Temperature Coefficient Outputs 1 - 4: 0.02% /oC

 Underwriters Laboratories File E137708 UL 60950-3rd Edition UL 60601-1 First Edition CB Report per IEC 60950-1: 1999 First Edition including all National Deviations CB Report per IEC 60601-1(1988) Second Edition A1, A2
 UL Recognition Mark For Canada File E137708 CAN/CSA-C22.2 No. 60950:2000
CAN/CSA-C22.2 No. 601-1-M90
 EN 60950:2000 EN 60601-1/A2:1995
Dielectric Strength 
Reinforced Insulation4242 VDC, Primary to Secondary, 1 Sec.
Basic Insulation2121 VDC, Primary to Ground, 1 Sec.

Operational Insulation

707 VDC, Secondary to Ground, 1 Sec.
Power Good SignalLogic high with input voltage above Vin min.
Remote Sense (singles only)250mV compensation of output cable losses.
Mean Time Between Failures100,000 Hours min., MIL-HDBK-217F, 25oC, GB
Weight2.16 Lbs.  Chassis and Cover
1.28 Lbs.  Open Frame

 Maximum Output Power vs. Ambient Temperature

Consult factory for alternate output configuration.
Consult factory for positive, negative or floating outputs.
Refer to Application Information for complete output power ratings.

All specifications are maximum at 25C unless otherwise stated and are subjected to change without notice.
Specify optional chassis and cover, power good or reverse input protection when ordering.
DC4-185-4001 +3.3V/20A(1) +5V/10A +12V/2A -12V/2A(1)
DC4-185-4002 +5V/20A(1) +3.3V/10A +12V/2A -12V/2A(1)
DC4-185-4003 +5V/20A(1) +3.3V/10A +15V/2A -15V/2A(1)
DC4-185-4004 +5V/20A(1) -5V/10A +12V/2A -12V/2A(1)
DC4-185-4005 +5V/20A(1) -5V/10A +15V/2A -15V/2A(1)
DC4-185-4006 +5V/20A(1) +24V/3A +12V/2A -12V/2A(1)
DC4-185-4007 +5V/20A(1) +24V/3A +15V/2A -15V/2A(1)
DC4-185-3001 +5V/20A(1) +12V/5A -12V/3A
DC4-185-3002 +5V/20A(1) +15V/4A -15V/3A
DC4-185-2001 +3.3V/20A(1) +5V/10A
DC4-185-2002 +5V/20A(1) +12V/8A
DC4-185-2003 +5V/20A(1) +24V/4A
DC4-185-2004 +12V/10A -12V/6A
DC4-185-2005 +15V/8A -15V/5A
DC4-185-1001 2.5V/37A(2)
DC4-185-1002 3.3V/37A(2)
DC4-185-1003 5V/37A(2)
DC4-185-1004 12V/15.4A
DC4-185-1005 15V/12.3A
DC4-185-1006 24V/7.7A
DC4-185-1007 28V/6.6A
DC4-185-1008 48V/3.8A

  1. Rated 15A with convection cooling.
  2. Rated 27A maximum with convection cooling.
  3. Total power must not exceed 135 watts with convection cooling on open frame models.
  4. Total power must not exceed 185 watts with 300LFM forced air cooling on open frame models.
  5. Total power must not exceed 110 watts with convection cooling and chassis/cover option.
  6. Total power must not exceed 185 watts with 300LFM forced air cooling and chassis/cover option.
  7. Total current from Outputs 3&4 must not exceed 3 amps with convection cooling.
  8. Total current from outputs 1&2 must not exceed 2 amps with convection cooling.
  9. Semiconductor case must not exceed 110C.
  10. Each output can deliver its rated current but total output power must not exceed maximum power as determined by the cooling method state above.
  11. Sufficient area must be provided around convection cooled power supplies to allow natural movement of air develop.
  12. 300 linear feet per minute of airflow must be maintained one inch above any point of the heatsink in the direction shown when forced air cooling is required.
  13. This product was type tested and safety certificated using the the dielectric strength test voltages listed in Table V of UL 60601-1. In consideration of clause 20.4g, care must be taken to insure the voltage applied to a reinforced insulation does not over stress basic insulation. Secondary to ground capacitors may need to be removed prior to performing a dielectric strength type test on the end product. It is highly recommended that the DC test voltages listed in DVB.1. Annex DVB are not exceeded during a production-line dielectric strength test of the assembled end product. Please consult factory for further information.
 1.Optimum  2.Good  3.Fair
  1. A minimum load of 10% is required on output one to insure proper regulation of remaining outputs.
  2. Peak to peak output ripple and noise is measured directly at the output
    terminals of the power supply, without the use of the probe ground lead or retractable tip, 20 MHz bandwidth.
  3. This product is intended for use as a professionally installed component within information technology and medical equipment.
  4. Remote sense terminals may be used to compensate for cable losses up to 250mV. The use of a twisted pair is recommended as well as a decoupling capacitor (0.1 0 10MicroF) and a capacitor of 100MicroF/amp connected across the load.
  5. This power supply has been safety approved and final tested using a DC
    dielectric strength test. Please consult factory before performing AC dielectric strength test.
  6. Maximum screw penetration into bottom chassis mounting holes is .100 inches.
  7. Maximum screw penetration into side chassis mounting holes is .250 inches.
  8. To meet emissions specifications, all four mounting hole ground pads must
    be electrically connected to a common metal chassis. Chassis/cover option recommended.
P1DC Input#6 standard (3)Position terminal block.
P2DC Output(Single)6-32 screw down terminal mates with #6 ring tongue terminal. (10 in-lb max)
P2DC Output(Multiple).156 friction lock header mates with Molex 09-50-3161 or equivalent crimp terminal housing with Molex 2478 or equivalent crimp terminal.
GGround.187 quick disconnect terminal.
P3P.F./Sense(Single).100 friction lock header mates with Molex 50-57-9008 or equivalent crimp terminal housing with Molex type 71851 or equivalent crimp terminal.
P3P.F./Sense(Multiple) .100 friction lock header mates with Molex 22-55-2081 or equivalent crimp terminal housing with Molex type 71851 or equivalent crimp terminal.