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In the old days before switchmode power supplies transformers needed the correct voltage input.
Modern switch mode power supplies are not so critical as they have an internal feed back that self adjusts the output so that they can work from 100v to 250v mains. Most of the simpler type do not fuse the input side, just the output. If the input side is fused the fuse value will need to be set for the input voltage.
If in doubt read the instructions!
The ceramic type fuses are mostly the HRC type and are filled with a flame retardant for use where explosive gases may be present. and there is a special fuse that many techos carry. A piece of copper/brass that neatly fits the fuse holder. NOT RECOMENDED!
As a side issue on fuses we used to have a transmitter that worked from 400v 3 phase. The wall supply (distribution panel) used HRC fuses and the transmitter 8 amp slow blow. We needed 20 amp HRC's in the main board to handle the turn on surge. Even so "C" phase often blew. This did not stop the transmitter working. Just made it run on 1/2 wave HT.
Peak power was the same but average way down with a great hum on the carrier. Many times I got called out after the maintainers could not find anything wrong. I just went to the main board and changed "C" phase fuse. Problem solved.
Barry
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