BK1/GMA-2-R is a fast-acting glass tube fuse designed for circuit protection with a 2A rated current and 250V AC voltage rating. The fuse features a 5 mm × 20 mm physical size with a glass tube construction and nickel-plated brass endcap, meeting UL/CSA 248-14 standards. It exhibits a typical DC cold resistance of 0.066 O, a typical pre-arc I²t value of 3.1, and a maximum voltage drop of 250 mV at rated current. The fuse is designed for fast-acting operation with low breaking capacity, providing reliable protection in electronic circuits and industrial applications where precise overcurrent protection is required.