PICO® II 473 Slo-Blo® Fuses Littelfuse PICO® II 473 Slo-Blo® Fuses combine time-delay performance characteristics with the proven reliability of a PICO fuse. The compact fuses feature enhanced inrush withstand and a wide operating temperature range with low-temperature derating. The series has a wide range of current ratings (0.375A - 7A). Littelfuse PICO II 473 Slo-Blo Fuses applications include flat-panel displays, LCD monitors, lighting systems, and medical and industrial equipment.