Bussmann FNM-4 is a low-voltage, time-delay fuse designed for branch circuit and feeder protection in industrial control panels and equipment. It is rated for 250V AC/DC systems with a 4A current rating, featuring a compact ferrule non-rejection design with dimensions of 0.39 in x 1.44 in x 0.39 in and a 0.41 in diameter. The fuse is constructed to meet CSA Class 1422-01 and UL-248-14 standards, offering a high 200kA interrupting capacity at 250V for reliable protection against short-circuits and overloads in motor circuits and transformer primaries.