Fortron "continuous power filter" are what?

[Anne Onime]

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.

 

[Rod Speed]

I inherited a bunch of these things. They seem rather
old, I could not find any specs for the model number.

Pity you didnt bother to include the model number.

I am curious: are they just a spike limiter, or is there really some "filter"?

Thats what a spike limiter is.

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.

There are lots of different ways to do a power filter.