I inherited a bunch of these things. They seem rather old, I could not find any specs for the model number. I am curious: are they just a spike limiter, or is there really some "filter"? One job I had, there were real power filters but they were the size of a wine cask and had capacitors the size of beer cans in them.
Pity you didnt bother to include the model number.
Thats what a spike limiter is.
There are lots of different ways to do a power filter.
Most of the older CPF's were a surge protector with a moderate absorption capability before they self-sacrificed, and also had a 50Hz low pass filter to reduce high frequency noise on the line. Early units (tan colour, approx 2" wide and deep by about 4" high, very rectangular) were made in Australia. Later models were wider with a more rounded appearance and made in China.
Some models also had high/low voltage shut-off. As such they weren't real good for computers, even though that's how they were marketed, but they made great brown-out protectors for anything with electric motors.
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