What to consider when selecting a MOV ?

[eem2am]

Hello,

I am trying to select a MOV for the input of my 230VAC offline flyback (15W).

Do i have to consider:-

1. The maximum input line
2. The maximum overcurrent expected.
3. The required maximum clamp voltage

?

MOV Selection Assistance charts have all kinds of waveform shapes of incoming overvoltage transients....which one should i design for?

 

[flatulent]

Re: MOV selection

These are chemically controlled and slow. They come in ratings based on the nominal mains voltage. They protect against lightning strikes and motors turning off which produces transients.