GDC 500mA (0.5A) 250V Slow Blow Glass Fuses 5X20mm T500mA GDC 500mA, 500m Amp, Pack of 5 500 mA T500mA 250v Glass Slow Blowing, 250 volts (also replaces 125v) This package has 5 pieces Dimension: 5 mm (3/16") x 20 mm (3/4") 500mA (0.5A), 250V Slow-Blow (Time Delay), Glass Fuse