Originally Posted by krackeer
Do I need a 30 amp protector or a 50 amp protector?
Many completely different devices are called protectors. One popular type (ie Progressive) is a voltage monitor. Cuts off power if voltage exceeds 132 or drops below 104 VAC. These voltage variations are a concern to motorized appliances (ie refrigerator, air conditioner).
The other useful protector must be located as close as possible to the pedestal. To connect a completely different surge to earth. Better ones for RVs include a locking device so that the protector does not walk away during the night.
Depends on which anomaly must be addressed. Other anomalies include harmonics, frequency variation, EMI/EMC, floating neutral, noise, etc. Neither above protector addresses any of them. Those anomalies should be irrelevant. Above two protectors address more common anomalies.