DEHNshield Basic TNC 255 FM

The three‑pole combined arrester enables the protection of compact TN‑C low‑voltage systems against lightning and surge effects. The spark‑gap technology ensures reliable discharge of high impulse currents and supports coordinated protection down to the end device. Thanks to the integrated remote signalling contact, status messages can be integrated into higher‑level systems. The compact design with 4 TE facilitates integration into existing distributions, especially in main distributions or meter cabinets. With a rated continuous operating voltage of 255V AC and a voltage protection level ≤1.5kV, the device is suitable for applications with increased requirements regarding system availability and immunity to interference.

• TechnologyThe combined arrester operates using spark‑gap technology that safely handles high lightning impulse currents while ensuring a low protection level. The design supports a coordinated protection concept within short discharge paths. In addition, the visual status indicator allows quick diagnostics in the control cabinet. The robust design permits use at central feed‑in points of TN‑C systems.
  
  Technical features
  • High lightning impulse current capability combining Type1 and Type2 protection.
  • Low protection level ≤1.5kV for safeguarding downstream components.
• ConnectivityThe device is equipped with a potential‑free remote signalling contact that enables connection to higher‑level monitoring or building automation systems. This allows the system status to be centrally recorded and rapid action to be taken in the event of a fault. The clear signal structure simplifies integration into existing monitoring architectures.
  
  Remote signalling functions
  • Changeover contact for status signalling to control or reporting systems.
  • Visual indicator for quick status checks in the control cabinet.
• CompatibilityThe combined arrester is designed for three‑phase TN‑C networks and can be integrated into main and sub‑distributions. Due to the low protection level, it is suitable for applications in which sensitive equipment must be protected close to the feed‑in point.
  
  Operating environment
  • Compatible with 230/400‑V TN‑C systems.
  • Can be integrated into 35‑mm DIN‑rail environments in accordance with EN standards.
• Installation conceptMounting is carried out on a 35‑mm DIN rail and enables fast integration into existing distributions. The compact 4‑TE design also facilitates installation in confined meter cabinets. The terminals are designed for common conductor cross‑sections and support safe wiring.
  
  Installation benefits
  • Compact 4‑TE design for confined distribution cabinets.
  • Designed for solid and flexible conductors up to 35mm².