I have been studying some electronics schematics to get background information on a power generator we use in my work. In one of these schematics I ran into the schematic I drew below. As seen here the Zener diodes are in opposite direction of each other.
My first impression was that I was looking at a (1)Transient-voltage-suppression diode that would catch voltage spikes.
But in electronics this is indicated with the below symbol:
As far as my knowledge goes on electronics (I am not an experienced electrician) zener diodes (or diodes in general) only conducts current in one direction. So I am curious to know what the function is of the diodes in the schematic from my work. Cause in my opinion they could be removed since they do not add any value to the circuit. Since if there is a current spike, it wont be caught.
None of my college knew the function of these and I haven’t been able to find any information or example on google or this site. I am hoping someone can explain it to me.
So my question is: What is the function of the zener diodes used in this setup?