The CV-400-7.5-240 is a lightweight, portable, solid state device designed for converting 200 - 250V 60HZ single phase or 200 -250V 60HZ 3-phase power into 200V/3-phase/400HZ power for drilling, hand sawing grinding, etc.
It’s primary use is in high rise buildings where 400 HZ power is not conveniently available, and in “sealed” buildings like telephone companies and hospitals where no access is available to the outside for power cords.
The CV-400-7.5-240 is noiseless, generates little heat, and is very desirable for use in occupied buildings for 400HZ motors up to 10 horsepower.