The Littelfuse 021506.3MXP is a Cartridge Fuses 250V 6.3A Slo-Blo, or slow-blow, fuse designed for surface-mount technology. The fuse has a ceramic body and copper lead frame. The parts are tin-plated and have a minimal resistance to improve electrical flow. The fuse acts as an overcurrent protection device, protecting equipment from short circuits, ground faults, surges, and other current overloads. This fuse is UL and cUL recognized and CSA certified, making it suitable for use in consumer electronics, instruments, lighting, and other electronics.