The MEGA® Fuse is designed for high current circuit protection up to 250 amperes with Diffusion Pill Technology the MEGA® Fuse also provides time-delay characteristics. Designed and patented by Littelfuse, the MEGA® Fuse is ideal for ultra-high current protection that is needed when upgrading your new stereo system. We have been using MEGA fuses for many years in our high-end builds here at the shop and it's simply the best quality fuse you can buy.