.200 Amp fuse used in the generator circuit. When the ceramic plate reaches the end of its useful life, the current will rise causing this fuse to blow. You should only replace this fuse after replacing the ceramic plate. If the fuse blows when the ceramic plate is still new, there is problem with the unit and you should call for technical help.
If you have an older system that uses a .125 Amp fuse, you can use a .200 Amp fuse if you have replaced the ceramic plates with a new one.