A Fast-Blow Glass Tube Fuse (5x20mm / 6x30mm Cartridge Fuse) is a sacrificial overcurrent safety device designed to protect electrical circuits, power supplies, and delicate electronics from short circuits and current overloads. Encapsulated in a transparent tubular glass body with nickel-plated brass end caps, it contains a calibrated internal metallic wire element. When circuit current exceeds the fuse's rated limit, resistance heats the filament past its melting point, physically breaking the circuit to prevent power supply damage or fire hazards.

This product is featured by Famephase Electronic Accessories as an essential protective component for power supplies, test instruments, amplifiers, and custom electronic project enclosures.