Anyone who doesn’t realize this shouldn’t be troubleshooting this issue. They should calling someone who knows what they are doing. Also, he said it’s a fuse. Fuses can be time delayed, but it’s not the same as the characteristics of thermal magnetic breakers which you are referring to.The other thing people don't realize is breakers have a time associated with them as well. So a 15A breaker will take a lot more than 15A for a very short time - milliseconds, before it will trip. You need to look up the curve for your particular breaker - if its published - another problem IMHO. That very short but very high current can easily be enough to fry electronics - which is why you need surge protectors.