âVaristor surge protective device (AC SPD)âCombined SPD Type 1&2 with MOV and CDGG technology for use in different power system.âVisual indication and optional remote pable of protecting Terminal equipment.âNon-follow current.âThe Pre unit consisting of a base part and replaceable plug-in protection modules.âInstallation at the boundaries from zone LPZ 0A to LPZ 2.âInstallation at the boundary of zones LPZ1 and LPZ2âUse for the direct lightning protection in Power system, can usage in Transformer low-voltage side.âDIN rail installation.