What's the effect of parallel resistor and MOV?
It will degrade the performance of the MOV. Normally you want the MOV to leak minimal current under normal operating conditions and conduct massive current, if necessary, if an overvoltage appears. Adding the resistor just makes it look like a leaky MOV. The below graph is log-log- the current varies from &lt; 1uA to &gt;10,000A. Graph from Littelfuse