Bussmann FNQ-R-4 is a low-voltage current-limiting fuse designed for protecting control circuits, transformers, and small motors. It features a 4A current rating and a 600V AC voltage rating, with a compact 1.5-inch length and 0.41-inch diameter body constructed for reliable performance. This fuse is certified to UL 248-4 and CSA Class 1422-01 standards, offering an interrupting rating of 200kA at 600V for robust short-circuit protection in industrial panelboards and control equipment.