Plug-in part type 2 L-N requirement class C, UC 350V 1-pole for surge arrester 5SD746. Surge protection devices protect against overvoltages in electrical systems. The surge protection devices from Siemens, as an important part of the SENTRON protection components for electrical installations, provide effective protection against lightning and overvoltages due to atmospheric influences or switching operations. Convenient mounting and connection technology, as well as a consistent design, are the hallmarks of the device family. Whether for infrastructure or industrial requirements, Siemens offers surge protection devices for all applications and every field of use. The Siemens surge protection devices are characterized by: 1. effective investment and system protection against lightning and surges. 2. the right lightning and surge protection for every application (type 1 to 3). 3. remote signaling contact for external upload of status indication. 4. reliable safety.