The closest thing I could find to replace a blown 630mA midget fuse on a Hioki is this:
https://ennologic.com/product/fuse-0-63a-1000v/Does anyone know where I can get specifications on this ennologic fuse?
The original part is a Holly 630mA aR 1000V AC/DC 50kA AC 30kA DC fuse. It is sometimes available from Hioki and costs like $18 plus shipping/tax.

I know Fluke has a 630mA fuse also available but its rated for 250V. I probably won't be measuring current on anything over 250V so perhaps that will work out?
Right now I'm using the fluke standard 440mA fuse, but would like to get the full range to 600mA back on the meter.
Any advice or comment greatly appreciated!