JLS Series UL Class J Fast-Acting fuses provide space-saving, fast-acting overload and short-circuit protection for non-inductive loads. When used for motors or other inductive loads, the ampere rating of JLS series fuses must be increased to prevent nuisance opening on inrush currents. In such applications, JLS fuses may provide only short circuit protection. Consider using Littelfuse POWR-PRO JTD series time-delay fuses in such circuits. Applications: General purpose circuits with little or no motor load, resistive loads, such as resistance electric heat and loads requiring fast-acting overload protection, such as equipment containing solid-state devices.