E-rated fuses have time current characteristics designed to provide current limiting protection for power transformers, potential transformers, power centers, feeder centers and unit sub stations. When properly applied, E-rated fuses can protect against high and low value fault currents. The clip lock type designs ensures a positive contact between the fuse and the connection cam. The fuse's clip lock tab slides in between the clip casting and the cam to prevent the fuse from slipping or blowing out of the holder. This positive contact improves heat dissipation and allows fuses to run cooler.