Cooper Bussmann 4A A1 T British Standard Fuse, gG, gM, 550V ac. Fuse Standard: BS 88-2:1988, IEC 60269-2. High Rupture Capacity: Yes. Body Diameter: 14.1mm. Overall Length: 55.6mm. Tag Width: 11.1mm. Body Height: 36.5mm. Fixing Centres: 44.5mm. MPN: NIT4