The OptiFuse 5mm x 20mm slow-blow glass fuse, rated at 250mA and 250V, comes in a convenient 5-pack. Designed as a time-lag fuse, it accommodates harmless inrush currents typical in applications like alternators, minimizing unnecessary trips. The clear glass body allows for easy inspection of the filaments condition. UL Listed and RoHS/REACH compliant, this fuse offers dependable protection by interrupting sustained overcurrents while ensuring normal operation under brief current surges. Each fuse measures 5mm in diameter and 20mm in length, with a 200A interrupt rating, making it ideal for safeguarding sensitive electronic circuits.