> Probably don't need to be so worried here. If it's a 3A fuse, the entirety of your apartment's mains power is not running through it.
If it's a "3A fuse" that doesn't blow at 6A or worse, then it will get very hot (fire hazard) if/when there's a short regardless of the distance to the mains power.
If it truly is a 3A fuse, then great. If it's bought from Amazon then I doubt it's truly a 3A fuse.
Louis Rossman over at YouTube has been going over this fuses thing from Amazon. All the fuses he tried from top-results didn't blow until he put 4x or 5x the current rating through them.
Probably not. But precision is expensive. A 3A +- 0.1A fuse will be more expensive to make them a 3A +- 6A fuse. And of course a customer will be upset with a 3A - 2A = 1A fuse so they really make a 9A +- 6A fuse and sell it as 3A.
So if you are "lucky" you can pass 12A though it no problem.
1) a dead short in the circuit. Fuse will blow pretty much instantly.
2) an overload on the circuit. Fuse will blow sooner or later depending on how great the load excess is. If the fuse is rated at 3A, it's not going to be fine at 2.9A and then instantly blow at 3.1A. You'd need actual current monitoring to do that.
And some fuses are "delayed" to allow an overload for a few moments, such as when starting a motor.
None of this disputes that Amazon is well known to sell garbage, and not just limited to fuses. That's why I don't buy anything there.
If it's a "3A fuse" that doesn't blow at 6A or worse, then it will get very hot (fire hazard) if/when there's a short regardless of the distance to the mains power.
If it truly is a 3A fuse, then great. If it's bought from Amazon then I doubt it's truly a 3A fuse.