Type 1 surge arrester, requirement class B, UC 350V, pluggable protection modules, 3-pole, 3+0 circuit for TNC systems with remote indication. Surge protection devices to protect against surges in electrical installations. Siemens surge protection devices are an essential part of the SENTRON protection components for electrical installations and provide effective protection against lightning and surges 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 particularly characterized by: 1. Effective investment and plant 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 status upload.