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If you are asking about MOV as in a Metal Oxide Varistor, then you choose the value at the point of clamping.
If your circuit is built for 120v, but you obviously derated your components, so they should survive to around AT LEAST 150v.
So you would choose a 150v MOV.
The MOV is a path to GROUND.
In normal operation, the MOV does NOTHING!
It is a closed valve (or OPEN circuit)
When the voltage on the line reaches the MOV's rated voltage, 150v in this case, the valve opens (circuit closes) and gives the spike a path to ground, instead of through your circuit.
Here is a link to surge suppression in general and includes MOV's:
http://www.naturalhandyman.com/iip/infelectrical/infsurgeprotect.html
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