Püschel Feinsicherungen Cartridge Fuses Micro fuse 623245 - Püschel Feinsicherungen FST0,5A, Püschel Feinsicherungen manufactures the FST0,5A micro fuse, which measures 5 mm x 20 mm and has a rating of 0.50 A and 250 V. This time-delay cartridge fuse, made of glass, is designed for circuits requiring slow-blow protection. It is typically used in electronic devices to protect against overcurrent and short-circuits. Püschel FST05A Micro Fuse 0.50A 250V Time Delay 5x20mm 10 Pieces