Bussmann FRN-R-1/2, 1/2 Amp (1/2A) 250V Fusetron Dual Element Time-Delay Current Limiting Class RK5 Fuse, UL Listed Dimension: 0.56"" Dia x 2"" L (14.3 x 50.8mm) Cylindrical TIME DELAY 1/2A 250V