Surge arrester DEHNshield TNS 255 FM Type 1+Type 2 941405

Electrical installation protection with DEHNshield TNS 255 FM

The DEHNshield TNS 255 FM surge arrester is a multi-pole, combined protective device designed to protect electrical installations from the effects of overvoltages, including those caused by direct lightning strikes. The device combines the functions of type 1 and type 2 arresters, providing comprehensive protection in residential and special buildings. Its compact design, only 4 modules wide, saves space in the distribution board.

Application and functionality

This arrester is used in TN-S networks with a rated voltage of 230/400V. It is compatible with the Zonal Concept of Lightning Protection (LPS) and is intended for installation between zone 0A and 2. Spark gap technology with limitation of follow current minimizes the risk of damage to the installation and connected devices. Additionally, the presence of a remote signaling contact enables quick identification of the device status and any need for replacement.

Key features and benefits

• Combination of types 1 and 2: Provides versatile protection against various types of overvoltages.
• Compact size: A width of 4 modules makes it easy to install even in crowded distribution boards.
• Spark gap technology: Provides effective protection while limiting follow currents.
• Remote signaling contact: Allows monitoring of the device status and quick response in case of failure.
• High energy discharge capacity: The lightning impulse current (10/350 µs) is as high as 50 kA, guaranteeing effective protection even during strong atmospheric discharges.
• Compliance with standards: Meets the requirements of PN-EN 61643-11, confirming high quality and safety of use.
• Energy coordination: Possibility of energy coordination according to DIN EN 62305-4 ensures optimal protection of the entire system.

Installation and operation

The DEHNshield TNS 255 FM arrester is mounted on a 35 mm DIN rail. Its design has been designed for ease of installation and reliable operation for a long time. The damage indicator informs about the need to replace the device after the occurrence of an overvoltage with high energy. Thanks to this, installers can quickly identify the need for intervention, and end users can be sure that their installation is properly protected.

This surge arrester is an investment in the safety and durability of the electrical installation, protecting both devices and the building structure itself from the effects of unforeseen weather events.