BK/MDL-3/4-R is a time-delay glass tube fuse designed for circuit protection in electrical systems. It features a 3/4 ampere rated current at 250 Vac with an AC interrupting rating of 35 amps at 250 Vac and 10,000 amps at 125 Vac. The fuse has a physical size of 1/4 x 1 1/4 inches (6.4 x 31.7 mm) with nickel-plated brass endcaps and a glass tube construction, meeting UL standard 248-14. It exhibits a typical DC cold resistance of 0.397 O and a typical melting I²t of 4.343 A²·sec, with a typical voltage drop of 1.01 V at rated current. This fuse is ideal for applications requiring time-delay protection in industrial control systems, power distribution equipment, and consumer electronics where reliable overcurrent protection is essential.