Datasheet
CUS250LD Series
7HVW
Single Output
250W Low Prole
Power Supplies
CUS250LD Series
1
www.uk.tdk-lambda.com/cus
Features    Benets 
• High efciency up to 90%    • Compact convection cooled device
• 30mm high    • Slim design for use in panels 
• Wide range AC input    • Allows global use
• Convection cooled    • No fan noise
• High grade component selection    • 3 year warranty
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Specication
 Model    CUS250LD
  AC Input Voltage  VAC  85 - 265VAC (300VAC for 5s)   
  Input Frequency  Hz  47 - 63Hz   
  DC Input Voltage  VDC  120 - 370VDC (No safety certication)   
  Inrush Current (cold start)  A  20A at 115VAC, 40A at 230VAC   
  Power Factor  -  Meets EN61000-3-2 (Typical PF 0.98/0.95)(1)   
  Input Current (115/230VAC)  A  2.8 / 1.4   
  Temperature Coefcient  -  <0.02%/°C   
  Overcurrent Protection  -  > 105%   
  Overvoltage Protection (2)  V  3.3V: 4 - 5.25V, 4.2V: 5 - 6.5V, 5V: 5.75 - 7.5V, 12V: 13.8 - 16.2V, 24V: 27.6 - 32.4V 
  Hold Up Time  ms  20ms   
  Leakage Current (240VAC 60Hz)  mA  <0.75mA   
  Remote Sense  -  No   
  LED Indicator  -  Green LED = On   
  Operating Temperature (3)  °C  -25°C to +70°C. Derate down to 50% load from +40°C to +70°C   
  Storage Temperature  °C  -30°C to +75°C   
  Operating Humidity (non condensing)  %  30 - 90% RH   
  Storage Humidity (non condensing)  %  10 - 90% RH   
  Cooling  -  Convection   
  Withstand Voltage  -  Input to Ground 2kVAC, Input to Output 3kVAC, Output to Ground 500VAC for 1 min. 
  Isolation Resistance  -  >100M at 25°C & 70%RH, Output to Ground 500VDC   
  Vibration (non operating)  -  10 - 55Hz: 19.6m/s
2
 constant sweep 1 min X, Y, Z for 1 hour   
  Shock  -  < 196.1 m/s
2
 (20G)   
  Immunity  -  IEC61000-4-2 (lv 2, 3), -3 (lv3), -4 (lv 3), -5 (lv3, 4), -6 (lv 3), -8 (lv 4), -11 
  Safety Agency Certications  -  UL60950-1, CSA60950-1-07 (cTUVus), EN60950-1, CE Mark  
  Conducted & Radiated EMI  -  EN55022-B, FCC--B   
  Weight (Typ)  g  700   
  Size (LxWxH)  mm  198 x 102 x 30   
  Warranty  yrs  3 Years   
Notes:
(1) 115 / 230VAC input (2) Cycle AC to reset 
(3) See derating curves on page 2.CUS250LD-3 derates linearly to 80% load from 115VAC to 85VAC input 
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