I was wondering what you meant when you said a " 30 amp rejector"!
I have never really seen those " Type S" fuses around here... The only one I think I have actually seen was at my old work in the fuse isle buried under a mound of dust!
The " Rejectors" I know of were plastic rings of either the 15 or 20 amp version that you screwed into your panel with a special fiber tool...The 15's would only allow a 15A fuse in but the 20A rejectors would allow a 15 or 20A fuse to be inserted... They worked but I sometimes had problems with them when using some brands of type "D" fuse of the correct rating, the rejectors rejected them too!
