Note that these fuses cannot blow overcurrent, at least not with lower rated fuses. I bought this to protect an old radio. I have tried fuses with the lowest rating of 0.5 amps and below. The 0.1, 0.2 and 0.25 fuses should have blown at 0.56A after some time, but none of them did. If you buy these fuses to protect your equipment, test them before you rely on them, or spend the extra money on Bussmann or other branded fuses.