Russian variable resistor datasheet
Here's the datasheet for the family. Here's how you read it:

Variables resistors wire frameless trimmers (versions
axis «Б», «В», «Д», «Е») and regulation (versions axis «А», «Г») actuators
with the circular motion of the mobile system for surface mounting, intended for use in DC and AC frequency to 1000 Hz.

The part on the picture above is rated for 25W nominal/long term power.