GBB-20-R is a very fast-acting ceramic tube fuse rated at 20A, designed for reliable overcurrent protection in electrical circuits. It features a 1/4" x 1-1/4" (6.35 x 31.75 mm) physical size with ceramic tube and nickel-plated brass endcap construction, and includes axial leads with 1.02 mm (0.040 in) diameter. The fuse is rated for 250 Vac and 125 Vdc operation, with AC interrupting ratings of 200A at both 250 Vac and 125 Vac, and DC interrupting rating of 200A at 125 Vdc. It exhibits a typical DC cold resistance of 0.00330 O and typical voltage drop of 0.0728 V. This UL Recognized and CSA Component Accepted fuse is ideal for applications requiring fast response to overcurrent conditions, providing dependable circuit protection in industrial and commercial equipment.