BK/AGC-4-R is a fast-acting, glass tube fuse rated at 4 amperes with a 250V AC voltage rating, featuring a 1/4" x 1-1/4" (6.3mm x 32mm) physical size and nickel-plated brass endcap construction. The fuse exhibits a typical DC cold resistance of 0.030 ohms and a typical melting I²t of 0.0305 A²s, with an AC interrupting rating of 200A at 125V and 10,000A at 250V. It meets UL standard 248-14 and is RoHS compliant, providing reliable circuit protection with fast response characteristics at 135% of rated current (60 minutes maximum) and 200% of rated current (120 seconds maximum). This fuse is commonly used in industrial equipment, consumer electronics, and power distribution systems where fast-acting protection and compact form factor are required.