The OptiFuse 5mm x 20mm 1A 250V Time Lag Glass Fuse pack offers reliable circuit protection with five slow-blow fuses designed for applications requiring tolerance to brief high inrush currents, such as alternators. Each clear glass fuse, UL Listed and recognized, measures 5mm by 20mm and features a time-lag design that prevents false trips by allowing harmless surges while interrupting sustained overcurrents. Rated for 250VAC, 1A current, and capable of interrupting up to 200A AC, this 5-pack allows easy visual inspection of the filament to ensure dependable operation.