Most devices have internal fuses to protect the device and its wiring from an internal failure. However, many devices, such as lighted SWR meters may have no internal fusing whatsoever.
Even with an internal fuse, the wiring to the device itself and its power jack is not protected in the event of being cut, pinched, shorted or otherwise damaged. This can lead to a catastrophic event when the supply has plenty of amperage to feed the lower resistance fault which can result in substantial overheating. This is where a fused distribution block with smaller amperage fuses for each port is valuable. Even though the supply is capable of high amperage, any fault in the downstream device will cause the lower amperage fuse to blow - thereby averting potential disaster.
You could of course install line fuses in each individual device cord but this quickly becomes cumbersome and a reliability headache. Invest in a fused distribution block, a bag of Anderson connectors and an Anderson Powerpole crimper - it will serve you well. I favor the distribution blocks that allow you to put a lock bar (wire) through the Anderson connectors to keep them from pulling or falling out of the distribution block.
- Glenn W9IQ