Fuse, 3 A, 250V AC, Not Rated, MDL Series, Glass Fuse, Time Delay, Body Style Cylindrical, Nonrejection, Interrupt Rating 100A at 250V AC, 10kA at 125V AC, Fuse Size 1-1/4 in L x 1/4 in dia, Length 1 1/4 in, Diameter 1/4 in, Equivalent Brand and Series Bussmann MDL, Bussmann MDQ, Bussmann MDV, Bussmann MDX, Littelfuse 313, Littelfuse 315, Mersen GDL, Mersen GDV, Equivalent Series 313, 315, GDL, GDV, MDL, MDQ, MDV, MDX, Body Material Glass These cartridge-style, time-delay glass fuses tolerate temporary inrush currents without opening, which prevents nuisance-blowing from equipment startups. Also called slow-blow glass fuses, they open to disconnect an electrical circuit when exposed to sustained loads and short circuits.Glass fuses provide overcurrent protection for low-current circuits in.