Current limiting E-Rated medium voltage fuses are defined by their melting time-current characteristic that permit their electrical interchangeability with other fuses of the same E Rating. They are physically dimensioned for easy installation in existing hardware to provide positive interruption even on low fault currents. E-Rated fuse constructions are available in ferrule, bolt-on and clip-lock and specialty mount fuses for AMPGARD® motor starters Outdoor rating available on select catalog numbers and open fuse indicator speeds troubleshooting by providing a positive visual indication of fuse operation.