Transient Suppression/MOV's

Thread Starter


Joined Jun 17, 2020
Hi everyone :D
I'm fitting a new Access Control Panel With a MagLock, keyboard Etc. The manufacturers tell me that the main panel will supply power to my MagLock but that I need to put a Metal Oxide Varistor across the power rails and I'm really struggling with the maths (As a Newbie who's also rubish at theory and math !)
The MagLock draws 420mA @ 12V, the power supply provides 14.3 V at 500mA and the panel Supplies 12V @ 500mA for the MagLock. PLEASE can any one suggest a suitable MOV value? Hopefullly with a part Number/Supplier?
Any help is very much appreciated.
Thanks everyone :D