I have to look into it. I didnt quite understand it. Is it good? I would think arduino had something suited for this common function, but its probably not normal because of the reasons mentioned, security. But security is actually the reason I implement it
Please elaborate on this security, in order that we may better understand your need.
for this common function
Oh, is it common? Did you find some information about how other people are implementing this common function, on the web?
yOu can read the thread. I dont think you understnad. Thread is closed.
Flag the topic if you want it closed. 
I finde some fuse I can controll with wifi, but not with arduino. But I can probably bypass the wifi and hook on to the built in solonoid or relay with arduino, or mby I need relay if the solonoid takes 12v.
That's right, I don't, due to the lack of information also pointed out by other responders.
ok. What information was lacking, also pointed out by others? I have been given alot of advice from others, but not from you because, as you said, you didnt understand. They have not pointed out that they didnt understand so I thought it wasnt worth explaining it in more detail since so many ppl understood alrdy. However they didnt know what to recommend to solve my problem, I just happen to have more knowlege, so I solved it myself. See my last post. Noone could give me that advice, but it is, as you can see. The best solution. But maybe you need more information. You spend way too much time on this forum
this one seems like it can work
You are opening a can of worms of which it is clear you have no idea of possible side effect requirements.
I found some remote controll relay circuit breakers, use 60 dollar, new 200 dollar. I dont think i understand what you mean by can of worms. I just have to meassure the voltage on the activation and I can bypass it with wire. I guess it is bluetooth.
Maybe it is a nomenclature issue. A "relay" can switch a circuit on or off.
A "Circuit Breaker" is a human safety device with an automatic switch-off for overload conditions.
If you modify/bypass a circuit breaker and something goes wrong, it has large insurance and liability implications.
Yes, im looking for a realy and circuit breaker combination in one device so that I dont need both on the same wire. Also I need the relay to be closed when not activated by arduino and I need it to not turn back on when power is lost since the point is to make the arduino shut itself off by using its own power, then when the relay loose power because arduino is shut off I need the relay to not reactivate the circuit giving power to the arduino agin.
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