[Milsurplus] Fuses to protect transformers

[hwhall at compuserve.com]

For this 40s vintage Link Trainer electronics I'm working on, I'm thinking that it'd be a good idea to fuse not only the primary but the secondary HV winding, since these transformers are not too easy to find anymore. I'm thinking of pigtail fuses inserted in the wiring under the chassis, to maintain appearances. But I'm not sure about what fuse selection would be adequate protection. 

Would a 1A fast blow fuse be OK for the secondary that probably delivers around 100ma DC? Or to put it another way, how much over the normal current output should I select a fast blow fuse? The filters are dual section choke input with 15 & 25 mfd caps. I haven't reached the point of firing up the whole thing, so I have to guess for now at the current.

The common fuses I have available are marked 250V and the HV is 450V. Can they be relied on to open and not arc? 

Any advice? Thanks!!

Wayne
WB4OGM