[xtatico1404]

svbeatrix, yes the primary function of a fuse/breaker is to protect the wires, but it also offers some protection to the device that is connected to it. However, as you correctly stated, the main function is to protect the wire.

mjrogers, you got it. There is no single rule for fuse selection/application. That's why I said that selection depends on the wire it protects, the location on the system as well as the connected loads, hence the need to have the proper knoledge. As you said, bad Juju can happen.