The GMC-3-R is a 3 A medium time-delay glass tube fuse in a 5 mm × 20 mm physical size, designed for general-purpose circuit protection in AC applications. It features a nickel-plated brass endcap construction and is RoHS compliant with halogen-free composition. The fuse is rated at 250 Vac with a 100 Vac interrupting rating, a typical DC cold resistance of 100 O, and a maximum voltage drop of 13 mV at rated current. It exhibits medium time-delay characteristics with a maximum opening time of 60 minutes at 135% of rated current and 2 minutes at 200% of rated current, making it suitable for circuits with inrush currents. The GMC-3-R is UL Listed (Guide JDYX, File E19180), CSA Certified (Class 1422-01), and MITI approved, and is commonly used in industrial control systems, power distribution panels, and consumer electronics requiring reliable overcurrent protection.