The Littelfuse FLSR100 Time-Delay Fuse is a 100 AMP, 600V protective fuse designed to safeguard HVAC equipment from overloads and short circuits. Its time-delay feature allows temporary inrush currents from motors, compressors, and transformers without nuisance tripping. https://www.partshnc.com/flsr100-littelfuse-fuse-600v-time-delay-100-amp