Size fuses based on wire size, not device amps?

[PaulLad]

So if your wire supports 20A (12ga) but you have a 10A inverter, the fuse should be 25-30A correct?

 

[JJJJ]

Fuse should always be lower than wire. Fire prevention.

 

[OffGridInTheCity]

12ga = 20a breaker (not 25-30a).

As @JJJJ said, a fuse or breaker is to protect the wire! (not the devices or loads). Devices, such as an inverter, will have their own protection if they need it.

 

[time2roll]

So if your wire supports 20A (12ga) but you have a 10A inverter, the fuse should be 25-30A correct?

I would be more in the 15-20 amp zone.

 

[Skypower]

I fuse to the lesser, component or cable.

 

[timselectric]

The purpose of OCP (Over Current Protection) is to protect the conductors.