Plug-in component Type 1 L-N, requirement class B, UC 350V, single-pole for surge arresters 5SD741 surge protection devices to protect against overvoltages in electrical systems. Siemens surge protection devices, as an essential part of the SENTRON protection components for electrical installations, provide effective protection against lightning and overvoltages caused by atmospheric influences or switching operations. Convenient mounting and connection technology, as well as a consistent design, are the hallmarks of this device family. Whether for infrastructure or industrial applications, Siemens offers surge protection devices for all applications and every area of use. Siemens surge protection devices are characterized primarily by: 1. Effective investment and plant protection against lightning and overvoltages. 2. The right lightning and surge protection for every application (Type 1 to 3). 3. Remote contact for external status indication upload. 4. Reliable safety.