I keep getting cheap stuff from aliexpress because I think I might want it then lose alL or any paperwork (probably in chinese anyway)This thing has no markings anywhere even on PCB (as well the terminal block is loose as solder has no connection with the pins, shows the quality. It is maybe speed control or temp control.
As Kev said - I have one similar sitting here on a shelf, bought it after seeing Big Clive pull one to bits. I even posted here (I think...) about perhaps using it as a speed control on an oscillating aquarium air pump.
Looks like it. You'll probably have to work out which terminal the load is meant to be connected to though.
One of them is 1st stop fuse maybe a hint.
BTW I meant to say that it's good to know that I'm not the only person with 'modules' sitting around who has trouble remembering what they all do. I've taken to writing specs on a piece of paper and putting it in a bag with the module in question but still have quite a few from before I started doing that. ;-)
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