A 5A cartridge fuse is a small cylindrical fuse designed to protect electrical circuits from overcurrent. When current exceeds 5 amps, the internal metal filament melts, breaking the circuit and preventing damage to equipment.

These fuses are commonly glass or ceramic tubes with metal end caps and come in standard sizes like 5×20 mm or 6×30 mm, depending on the application.

• Rated for 5 amps (blows when current exceeds this)
• Available in fast-blow or slow-blow (time delay) types
• Common sizes: 5×20 mm or 1/4 in. × 1-1/4 in.