The BK/MDL-12-R is a time-delay glass tube fuse designed for circuit protection in electrical systems. It features a 1/4 x 1 1/4 inch (6.4 x 31.7 mm) physical size with nickel-plated brass endcaps and is constructed from glass tubing to provide reliable performance. The fuse is rated at 12 amperes with a 250 Vac voltage rating and an AC interrupting rating of 200 amps at 250 Vac. It exhibits a typical DC cold resistance of 0.0083 O and a typical melting I²t of 144 A²·s, with a typical voltage drop of 0.098 V at rated current. The fuse meets UL standard 248-14 and is RoHS compliant (2002/95/EC), making it suitable for industrial and commercial applications requiring time-delay protection and compliance with safety standards.