A 400Hz frequency convertor is a special device that change electrical power from one frequency to another. Most systems use 50Hz or 60Hz, but some equipment in aviation and military need 400Hz. This higher freq allows machines to run more better and can make them smaller lighter. For example aircraft use 400Hz because they save weight and space, which is important in flying. If you look for way to power your 400Hz stuff, a converter from JQD could be what you need.
