[Locomotive Breath]

I just read the web site. It’s what’s otherwise called an “Active Power Factor Corrector”.

http://en.wikipedia.org/wiki/Power_factor_correction

But it’s not going to save you the kind of money they say unless you have a house full of lightly loaded induction motors or a lot of rectifier loads that don’t have built in PFC. For example, the computer at which you are reading this post almost certainly has PFC built in.

[dennisw]

Many thanks for the explanation. It might save electricity in an industrial setting