DEHNshield Basic TNS 255 FM

The DEHNshield Basic TNS 255 FM is a compact Type 1+2 combined arrester for TN‑S systems and is used to protect alternating current installations against direct and indirect overvoltages. The integrated spark gap technology increases robustness against lightning currents, while the remote signaling contact enables easy integration into monitoring systems. With its four‑pole design and a rated value of 255V AC, the device is suitable for control cabinet applications in commercial and industrial projects. The limited protection level contributes to safe coordination with downstream protective devices.

• TechnologyThe device uses spark gap technology for the safe discharge of high lightning impulse currents and for limiting follow current. This ensures stable operation even under demanding grid conditions. The low protection level enables effective voltage limitation and relieves downstream components. The combination of Type 1 and Type 2 protection creates a wide range of applications where both lightning and switching overvoltages may occur.
  
  Key technical aspects
  • Combined lightning and surge protection for TN‑S systems
  • Spark gap technology with effective follow current limitation
  • Low protection level for improved coordination with end devices
• ConnectivityThe integrated remote signaling contact allows easy integration into central monitoring or building management systems. This makes it possible to detect and process status messages such as tripping or faults at an early stage. This interface supports installers in implementing efficient maintenance and monitoring concepts.
  
  Communication-related functions
  • Remote signaling contact for forwarding status and fault messages
• CompatibilityThe combined arrester is designed for 230/400‑V TN‑S systems and can therefore be used universally in commercial main and sub‑distributions. Thanks to its four‑pole design, it is directly suitable for common installation architectures. The energy coordination facilitates integration into existing protection concepts.
• Installation conceptThe device is designed for mounting on DIN rails and, with a width of four modules, offers fast integration into standard distributions. The compact design also facilitates installation where space is limited. The clear status indicator supports quick on‑site checks during installation.