The Littelfuse FLNR090 Fuse is a 250V, 90-amp time-delay fuse designed to protect HVAC and other electrical equipment from overloads and short circuits. It works by allowing temporary inrush currents while safely interrupting sustained overload conditions, helping maintain stable system performance. https://www.partshnc.com/flnr090-littelfuse-fuse-250v-time-delay-90-amp