Lightning arrester type 1, 12.5 kA, lightning protection class III and IV, for 3-wire networks (L, N, PE), UC 335V/264V AC (L-N/N-PE), Mechanical defect indication Surge protection devices for protecting against overvoltage in electrical systems. As an important component of the SENTRON protective components for electrical installations, the surge protection devices from Siemens provide effective protection in the event of lightning and overvoltage due to atmospheric influences or switching operations. User-friendly mounting and connection technology as well as an integrated design are the characteristics of the device family. Whether for infrastructure or for industrial requirements, Siemens provides surge protection devices for all applications and every application area. Key features of the Siemens surge protection devices: 1. Effective investment and plant protection against lightning and overvoltage. 2. The right lightning/overvoltage protection (type 1 to 3) for every use case. 3