The Littelfuse FLSR150 is a 150A, 600V time-delay fuse designed to protect HVAC electrical circuits from overloads and short circuits. It operates by allowing brief inrush currents while safeguarding motors, compressors, and control panels in commercial and industrial HVAC systems. https://www.partshnc.com/flsr150-littelfuse-fuse-600v-time-delay-150-amp