Littelfuse - Carded 1-Pack of MEGA Slo-Blo Automotive Bolt-Down Fuse. The MEGA Fuse is designed for high current circuit protection up to 250 amperes found OEM on Ford, GM and Chrysler vehicles with “Diffusion Pill Technology”. The MEGA Fuse also provides time delay characteristics. Designed and patented by Littelfuse, the MEGA Fuse is ideal for battery and alternator protection application and other heavy gauge cables requiring ultra-high current protection. Slo-Blo feature eliminates nuisance blowing during temporary short duration overloads. Slo-Blo feature eliminates nuisance blowing during temporary short duration overloads.