It looks good, but during a sudden power outage due to bad weather, it did not cut off the power supply for 5 seconds as it should have, but continued to provide power normally. It didn't even notice it. The voltage stabilizer that I have for sensitive electronic devices noticed it and cut off the power. So, what kind of protection does it provide?
During a power outage, the voltage drops, but you may receive irregularly high voltage from the transformer in the column outside the house. Transformers have capacitive behavior and accumulate energy. When there is a power outage, there is a possibility that they will send you very high voltage and burn devices. Power outages are very dangerous.