Siba ultra rapid 32 x 63mm ceramic fuses siba 70 125 408a cylindrical fuse ultra rapid characteristic 8a current rating 500vac voltage rating 50ka interrupting rating ceramic body material 635x32mm fuse standards iec ul vde 024kg100 weight 350mv voltage drop ultra rapid ceramic sand filled fuses with high voltage and breaking capacity ul recognised for use in protection of semiconductors such as triacs thyristors and diodes as well as use in test probe leads siba 70 125 4