The GMA-4-R is a fast-acting glass tube fuse designed for circuit protection in low-voltage AC applications. It features a 4 A rated current with a 125 Vac voltage rating and an interrupting rating of 10,000 A at 125 Vac. The fuse has a 5 mm × 20 mm physical size with a nickel-plated brass endcap construction and exhibits a typical DC cold resistance of 0.026 O and a typical pre-arc I²t value of 19 A²s. It operates with a maximum voltage drop of 205 mV at rated current and meets UL/CSA 248-14 design standards. The GMA-4-R is commonly used in consumer electronics, industrial control circuits, and appliances where reliable overcurrent protection and fast response times are required.