Surge Protection Devices (SPD) Finder’s 7P Series consists of Type 1+2, Type 1, Type 2, and Type 3 surge arresters. ' These devices include the following features (according to Type): Type 1+2 are for the LPZ 0-1 boundary (where the supply enters the installation), Type 2 for the LPZ 1-2 boundary (main distribution panels within […]