I am using a 12V relay to drive high voltage contactors. The contactor coil causes EMC when turned off. I am uncertain of which circuit I should use for reducing the EMC. Is there even any difference between option 1 and 2?
Secondly It was recommended that I should use a 24V zener diode. But I couldn't find any information on what current rating the zener diode and the normal diode should have. The operating current of the HV contactor coil is around 0.5A. Should the zener diode be able to handle the whole operating current? Is there a way to estimate it?
I had trouble finding a datasheet for the contactor it's name is AEV6505A from panasonic. So I based my info on a similar contactor I looked at the specs for the highest current contactor just to be safe.
EDIT! Would this zener diode work since it has a " Non Repetitive Surge Power Dissipation" of over 100W at 1ms. And the maximum wattage from the coil is only 0.5A*12V=6W?
EDIT 2! Thanks for all the answers!