I am interfacing multiple AC wall switches to activate relays that control appliances. For surge protection, instead of connecting a MOV for each switch, thinking of connecting one MOV through diodes from each switch. Pls see the diodes D2 & D4. I have total of 8 switches is each relay controller board.
Is this an efficient way or should connect individual MOVs without diode and across the AC terminals?
Pls see the Zener Diode (ZD1) for constant voltage & the diode (D1) for reverse voltage protection, which are connected parallel. Is this more efficient that having only the Zener diode?