Eaton Bussmann series high speed British standard fuse, Single barrel, 315A, 690 VAC/450 VDC (IEC), 700 VAC/500 VDC (UL), Class aR, Breaking capacity 200 kA RMS Sym., 40 kA DC at 450 VDC (IEC), 50 kA at 500 VDC (UL)