Response time
The response duration of the varistors isn't standardized. The sub-nanosecond MOV response claim is
dependant on the material's intrinsic response time, and can
be slowed down lower by additional
factors like the inductance of component leads and also the mounting method. That response time can also be qualified as minor when in comparison to some transient getting an 8 μs rise-time, therefore permitting ample here we are at the unit to gradually turn-on. When exposed to some extremely
fast, <1 ns rise-time transient, response times for the MOV are in the 40-60 ns range.
Capacitance
Typical
capacitance for consumer-sized (7-20
mm diameter) varistors have been in the plethora of 100-1,000 pF. Smaller sized,
lower-capacitance varistors can be found with capacitance of ~1 pF for microelectronic protection, for example in cell phones. These low-capacitance
varistors are, however, not able to resist large surge power simply
because of their compact PCB-mount size.
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