The OptiFuse 5mm x 20mm 10A 250V time-lag glass fuse (5 pack) is designed for reliable circuit protection in applications with temporary inrush currents, such as alternators. This UL Listed fuse features a glass body measuring 5mm in diameter and 20mm in length, allowing easy visual inspection of the filament. It withstands 250VAC at 10A with a 200A interrupt rating, opening only when a sustained overcurrent occurs to prevent nuisance trips. Ideal for safeguarding sensitive electronics, this pack of five offers trusted performance under demanding conditions.