Depends on what you want to protect
I bought a "surge protector" which plugs into receptacles. Plugged microwave and converter in using them.
The whole system units are better as they protect all circuits simultaneously. Additionally, you can have a system which checks for low/over voltage and miswired, and delay restarts for electrical following an "outage". This can protect your AC unit.
Hope this helps.
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Peace and Blessings..
Channing
WBCCI# 30676
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