I have seen many design to protect nput circuitry from surge , EFT and ESD
Mov's for surge protection, Choke for Conducted emission TVS for ESD. still i am confused on below point
Q1) If surge is applied to both input power line and all I/O lines then why most of design only had mov on Power lines but not on IO lines.
Q2) TVS diode on IO line will protect from ESD or EFT or both.
Q3) Mov is for surge protection but what device protect circuit from EFT on power lines.
Q4) what protection device used for power lines to protect from ESD.