1 Box - FUSE 20A (SMALL Brown) FUSE 30A (SMALL Green) FUSE 10A (SMALL Red) 保险丝FUSE 30A (medium Yellow) - A fuse is a safety device designed to protect electrical circuits from overloads and short circuits. It consists of a metal wire or strip that melts when excessive current flows, breaking the circuit and preventing damage to components. Fuses are essential in various applications, ensuring reliable operation and safeguarding equipment.