BK/GMD-1.25-R is a time-delay glass tube fuse designed for circuit protection in electrical systems. It features a 5 mm × 20 mm physical size with a rated current of 1.25A and a voltage rating of 250V, providing an interrupting rating of 100A at rated voltage. The fuse has a cold resistance of 0.1995O, a typical melting I²t of 16 A²s, and a typical voltage drop of 245 mV at rated current. With nickel-plated brass endcap construction and time-delay characteristics, it meets UL, CSA, and PSE/JET agency approvals. This fuse is ideal for protecting sensitive electronic circuits and equipment where delayed response to temporary overcurrents is required, offering reliable protection without nuisance trips.