So as to not play 20 questions this looks like the fuse on a red screen height control box, what plasma cutter are you using. If it is a Cutmaster series make sure you are not using the spade connectors inside those units for raw arc voltage. You should be using Work + (plasma ground cable) and Torch - studs on the circuit board.
Attachments
CM81, 101, 151 Voltage conections with alternate connections.jpg
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