Power cord - when i press not completely button i hear buzzing .

[sewerino26]

Hello. My power cord is:

https://www.x-kom.pl/p/388216-listw...a-przeciwprzepieciowa-sb0501ba-fr-5-x-pl.html

When i press not completely button and holding for 1 second i hear buzzing electric crackling noise. Is this something wrong? I have expensive pc, so i am worried eh