MDA-4-1/2 vs MDA-4 vs MDA-4-1/2-R

PartNumber	MDA-4-1/2	MDA-4	MDA-4-1/2-R
Description	Cartridge Fuses BUSS SMALL DIMENSION FUSE	TIME DELAY BLOW ELECTRIC FUSE, 4A, 250VAC, 200A (IR), INLINE/HOLDER (Also Known As: BK/MDA-4)	Cartridge Fuses SMALL DIMENSION FUSE