1 Packet of 4 x 13Amp BS1362 BUB Fuses - A fuse interrupts any excessive current so that further damage by overheating or fire can be prevented. Wiring regulations often define a maximum fuse current rating for particular circuits. Having an Overcurrent protection device is essential in electrical systems to limit threats to human life and property damage. Fuses are selected to allow passage of normal current and of excessive current only for short periods.