Furthermore, it must be noted that the information concerning the maximum
permissible overcurrent protection circuits in the data sheet of the SPD is only valid
up to the value of the stated short-circuit withstand capability of the protective
device. If the short-circuit current at the installation site is greater than the stated shortcircuit
withstand capability of the protective device, a backup fuse must be chosen that
is smaller than the maximum backup fuse stated in the data sheet of the arrester by a
ratio of 1:1.6.