i just got a powcon 300sm/5p with a powcon power drive 1 for my mig i was trying to dial in the mig end of it and it stopped feeding wire i pulled the bus fuse out of the back just a glass fuse but it doesnt have a amp rating on it all it says isbuss mda 2 1/2 and on the other end it says 250v UL i just dont want to put a bigger fuse in then im suppose to in case somethings sketchy in the machine and i ruin something and help would be appreciated thanks ken