Solid-state SmartSpot indicator Time-delay for motor starting and transformer inrush currents without nuisance opening 300kA interrupting rating, self-certified (UL witnessed test) Extremely current-limiting for low peak let-thru current Easy 2-to-1 selectivity for prevention of nuisance shut downs and "black outs" Rejection-style design prevents replacement errors (when used with recommended fuse blocks) High-visibility orange label gives instant recognition Reduced inventory by taking the place of Class RK5, K, and H fuses Metal embossed date and catalog number for easier traceability and lasting identification Fiberglass body provides dimensional stability in harsh industrial settings High-grade silica filler ensures fast arc quenching