Originally Posted by Half66Chevelle
One other thing for my education and is probably a dumb question.
How does the 30 amp circuit breaker differ from the inline fuse (which is what I went with since Aero recommended that set up)? How does the circuit breaker protect from fire, etc? I understand how the inline fuse works....Fuse blows and the hot lead connection is broken, circuit stopped. The circuit breaker I got with the kit mentioned in OP doesn't have anything to reset or a fuse connecting the two posts on the circuit breaker. Is there some internal mechanism in this thing? If so, then how do you reset?
We all have to learn things and it's great you ask questions to want to know more.
Basically do a search and see what style breaker you might have:
A 30 amp fuse and a 30 amp breaker basically do the same thing in that if the current (amperage) exceeds this 30A of current, then the flow of power is stopped by opening up the connection of one end of the fuse to the other or from one end of the breaker to the other.
Years ago there were only fuses out there with a short section of fuse material between one end of the fuse and the other. When too much current was passed through this material the material would melt apart thus stopping the flow of power from one end of the fuse to the other. A fuse is a one shot protection device in that when too much current passes through it and the fuse material melts apart there is no way to easily replace this melted section so the fuse get's thrown away and a new one of the same size and type is used to replace the blown one.
At some point someone figured out how to make a device called a circuit breaker and a circuit breaker does the same thing as a fuse in that if too much current passes through it, the flow of power get's stopped. Due to the design of a breaker, and there are two types out there, is when a breaker does open up inside the flow of power is stopped and then once the reason for it opening up (excessive current/amperage flow) is corrected, the circuit breaker can be used once again and not have to be replaced.
The circuit breaker was also designed in two configurations. In both ways if an overload occurred, the breaker stopped the flow of power and then the one design would allow power to be automatically restored once the reason for the overload was corrected and brought down to below the breakers rating while the other type would still open up and stop the flow of power but instead of automatically reconnecting once the issue was resolved, one has to manually reset the breaker for it to pass power once again.
You might want to do some google searches on how a circuit breaker operates and it might give you some more insight.
Also keep in mind that a 30A fuse or a 30A breaker should pass this current all day long, 24/7 but they will not open up or stop the flow of power if asked to pass 31A. they will or should do that but you will find out that fuses and circuit breakers have different operating characteristics in that one type may be rated at 30A and it can pass 40A for 2 minutes before it blows or opens up while another type still rated at 30A might pass 40A for 10 minutes before it blows or opens up.
My opinion is to either use a fuse or a manually re-settable breaker. If they stop the flow of power, then this is telling you one needs to find the issue and correct it. Below is in a vehicle I had to work on and it had an automatically re-settable breaker in the fuse block and it caused a BUNCH of damage.
In the above picture to the right and below that melted spot, those small rectangular boxes are automatic reset breakers.