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Hallo all.


My today's question is:

1. What can I choose between SPD(surge protector Divice) and Voltage protector (AVR). If I have to install protective device in my DB board and I have to choose only one, which one can I install first with the hope to get the other one later, I understand they perform different specific duties. Will it also be advisable to install them both?


2. Does the Automatic changeover switch has both SPD and AVR built in. Will it be advisable to use it replacing both SPD and AVR or it's just has the only duty to switch from normal grid to reserve power.


Your inputs will be highly appreciated



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