Safety fuses are devices designed to protect electrical circuits from overloads and short circuits. They contain a thin wire that melts when excessive current flows through it, breaking the circuit and preventing damage to appliances and wiring. This simple mechanism helps ensure safety in homes and industries by preventing fires and equipment failures. When a fuse blows, it must be replaced to restore power. Safety fuses come in various types, including cartridge fuses and glass tube fuses, each suited for different applications. Regularly checking and replacing blown fuses is essential for maintaining electrical safety and efficiency.