Product Details

Model No
Selling Unit EACH
Categories Portable Power Product
Power Products & Accessories
Isolators & Combiners
West Mountain Radio
Power Products
Description ISOpwr auxiliary battery isolator
Voltage 12V
Size 40A
Width 133.3mm
Height 41.9mm
Length/Breadth/Depth 99.1mm
Weight 400g

The ISOpwr auxiliary battery isolator isolates and charges a 12 Volt auxiliary battery to run mobile radio and other 12 Volt portable equipment.


  • Ideal for mobile radio command stations for ARES, RACES, FEMA, and for a VHF/UHF Contest Rovers, moderately powered ham equipment, re-charging stations for electric model airplanes, boats and cars, and for RV's and campers.
  • ISOpwr turns ON when the car is running and the alternator is maintaining the car battery over 13.5 volts.
  • ISOpwr turns OFF when the alternator is off and the car's battery has fallen below 12.7 volts.
  • All solid state. FET switch. No relays. Handles up to 40 amperes. Input fuse 40 A.
  • Works safely with all types of 12V lead acid batteries, Flooded Lead Acid, Gel & AGM.
  • May be used without a battery to automatically turn a radio on whenever the car is running. The radio will turn off with a small delay after the car is stopped.


  • Operating Voltage: 20 V maximum
  • Quiescent Current: Less than 5 mA
  • Maximum Current: 40 A
  • Voltage Drop: 0.25 V at 1 A, diode drop
  • Series Resistance: 0.01 ohms maximum
  • Switch Time-Constant: 5 seconds
  • Turn ON Threshold: 13.3 (± 0.1)V
  • Turn OFF Threshold: 12.6 (± 0.1)V
  • Green LED: Indicates the ISOpwr output is ON
  • Enclosure: Heatsink, black anodized aluminum. Painted aluminum cover.

The ISOpwr comes with:

  • ISOpwr Unit
  • Battery Fuse & Terminal Kit
  • (4) Rubber Feet
  • User Manual
Data Sheet

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