The Littelfuse® varistor surge protection (LVSP) fuses are intended for the protection of TVSS products. The LVSP series has been designed to survive the 8 x 20 us lightning surges described in various Standards(UL 1449, IEC 61000-4-5 and IEEE C62.41) without opening. This allows the TVSS to perform the necessary suppression. The LVSP series is not rated for continuous current and the ratings are to specific 8 x 20 us surge capability. The LVSP series can be used to facilitate TVSS module compliance to UL 1449 in permanently connected applications (abnormal overvoltage, unlimited current conditions).