Isolated DC/DC Converter 70W – 150W

IEXT & IEHR series have been manufactured by Helios Power Solutions over the last 35 years and it is considered one of the most reliable DC-DC Converters in the market. Our converters have a wide input range from 12V to 110V and output voltage range from 4.5V to 55.2V.

The IEXT Series has a constant output current limit and is suitable for battery charging. Please specify output voltage on ordering. Whether you require a custom DC output or conformal coating for harsh environments, please contact our team of engineer at

Main Features

  • Isolated input-output – chassis
  • Designed for industrial use
  • High reliability
  • Output over-voltage protection (IEXT)
  • Constant current limit for charging (IEXT)
  • Input transient/surge suppression
  • Short circuit protection
  • Reverse polarity protection
  • External trim pot for output voltage adjustment
  • Output decoupling diode and dc fail alarm standard
  • Optional conformal coating
  • Optional DC Fail alarm

Output Protection

IEXT(70W): Overload: constant current limit Severe overload: shuts down when output < 5V, power off to reset. IEXT Series is suitable for battery charging.
IEHR(150W): Hiccup mode current limit

Electrical & Mechanical Options

  • Rack Mount: Converter fitted into 19″ x 2U subrack.
CSB261150W 110VDC/12VDC Redundant DC/DC Converter

N+1 Redundancy Rack Mount IEXT DC-DC Converter with front removable power modules

  • DIN Rail Mount: Using DIN rail clips.
  • Fork Hoist Use +FORKHOIST, models below have been designed for Forklift applications.

Special DC-DC Converters for Forkhoist – Forklift Applications

At Helios Power Solutions we have developed a special range of DC-DC Converters which have in-built input surge protection.

Model CodeBase ModelSpecial Features
IEXT/24-12GIEXT/MV-12Input 20 -30Vdc, output 13.8V for forkhoist use
IEXT/48-12GIEXT/MV-12Input 40 -60Vdc, output 13.8V for forkhoist use
IEXT/110-12GIEXT/HV-12Input 66-130Vdc, output 13.8V for forkhoist use
IEXT/48-16GIEXT/MV-16Input 40 -60Vdc, output 16V for forkhoist use
IEXT/48-24GIEXT/MV-24Input 40 -60Vdc, output 24V for forkhoist use
  • Undervoltage Lockout: Available on IEXT/LV models, Lockout at 10.2V. auto reset at 12.4V, add suffix -UV
  • Use with laptops: Some laptops require a “Sense” the diode is replaced with a resistor and the D+ terminal becomes the “Sense” terminal


Models1Input Voltage RangeOutput Voltage*4AmpsPower W
IEXT/MV-08*321 – 6086.570
IEXT/MV-12P21 – 6013.8570
IEXT/MV-18P21 – 60183.870
IEXT/MV-24P21 – 6024370
IEXT/MV-48P21 – 60481.570
IEXT/HV-12P60 – 13213.8570
IEXT/HV-24P60 – 13224370
IEXT/HV-48P60 – 132481.570
IEHR/HV-12P60 – 13213.811.2150
IEHR/HV-24P60 – 132246.2150
IEHR/HV-36P60 – 132364.2150
IEHR/HV-48P60 – 132483.2150

1Model codes without the -P suffix do not have diode and alarm relay fitted.
2 No overvoltage protection.
3 No input rectifier bridge,or output diode.IEXT/MV-08/01 has input range of 21-36V, & extra-low noise model
4 Refer to terminal connections below. Output voltage is set at +D output except for 12V models where the ‘+’ output is set to 13.8V  19V output models available for laptops (incl. sense terminal).


Operating input voltage range12, 24, 36, 48V
Output PowerIEXT: 70W continuous
IEHR: 150W continuous
Output VoltageRefer to model table
Output CurrentRefer to model table
EfficiencyLV: 72-80%, MV/24/48: 80-87%, HV: 85-87%
Operating Temp:0 to 40°C; linearly derate to 50% output at
Isolation1KV DC input – output – chassis
Line Regulation< 0.5% over input range
Load Regulation< 0.7% open circuit to full load
Alarm contactsChangeover, 1A 30VDC


Model code Base Model Special Features

CHR101 IEHR/24-19P 47k ohm resistor fitted between “+” terminal and “+SENSE” terminal, for laptops
IEXT/24-12G IEXT/MV-12 Input 20 -30Vdc, output 13.8V for forkhoist – forklift use
IEXT/48-12G IEXT/MV-12 Input 40 -60Vdc, output 13.8V for forkhoist – forklift use
IEXT/110-12G IEXT/HV-12 Input 66-130Vdc, output 13.8V for forkhoist – forklift use
CXT103 IEXT/MV-12P Input 24Vac, output 13.8V, 50W
IEXT/LV-08 IEXT/LV Input 11-16V, output 8V 45W
IEXT/48-16G IEXT/MV-16 Input 40 -60Vdc, output 16V for forkhoist – forklift  use
IEXT/48-24G IEXT/MV-24 Input 40 -60Vdc, output 24V for forkhoist – forklift  use

Ask for Assistance

Selecting the right power supply for your application is not a small task. Let our technical sales engineers guide you through the process of choosing the right solution for your needs.

Below some parameters usually required to size and select the right power supply:

  • Power & control requirements
  • Output & Input Voltage / Multioutput Voltage / Variable Voltage
  • Redundancy level
  • Mounting
  • Inrush Current
  • Environmental specifications (Temperature, altitude, vibration, shock)
  • Specific Industries Standards (Railway, Military, Medical)
  • Terminals

Contact Our Team

Contact our team of experienced engineers to discuss your unique power conversion and backup needs. We offer a wide range of highly reliable components that can be integrated and customized to create a solution that meets or exceeds your requirements.

For power automation systems please contact us at

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